'
duol-20240425
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549 
SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.    )
Filed by the Registrant  ☒Filed by a Party other than the Registrant  ☐
Check the appropriate box:
Preliminary Proxy Statement
Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
Definitive Proxy Statement
Definitive Additional Materials
Soliciting Material under § 240.14a-12
Duolingo, Inc.
(Name of Registrant as Specified in its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check all boxes that apply):
☒ No fee required.
☐ Fee paid previously with preliminary materials.
☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.




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Duolingo, Inc.
5900 Penn Avenue
Pittsburgh, Pennsylvania 15206
April 25, 2024
Dear Fellow Stockholders:
On behalf of the Board of Directors, I cordially invite you to attend the 2024 annual meeting of stockholders (the “Annual Meeting”) of Duolingo, Inc., which will be held on Wednesday, June 12, 2024, beginning at 11:30 a.m., Eastern Time. The Annual Meeting will be a completely virtual meeting, which will be conducted via live webcast.
In accordance with the Securities and Exchange Commission rules allowing companies to furnish proxy materials to their stockholders over the Internet, we have sent stockholders of record as of the close of business on April 15, 2024 a Notice of Internet Availability of Proxy Materials. The notice contains instructions on how to access our Proxy Statement and Annual Report and vote online. If you would like to receive a printed copy of our proxy materials from us instead of downloading a printable version from the Internet, please follow the instructions for requesting such materials included in the notice, as well as in the attached Proxy Statement.
Attached to this letter are a Notice of Annual Meeting of Stockholders and Proxy Statement, which describe the business to be conducted at the Annual Meeting.
Your vote is important to us. Please act as soon as possible to vote your shares. It is important that your shares be represented at the meeting whether or not you plan to attend the Annual Meeting via the Internet. Please vote electronically over the Internet, by telephone or, if you receive a paper copy of the proxy card by mail, by returning your signed proxy card in the envelope provided. You may also vote your shares online during the Annual Meeting. Instructions on how to vote while participating at the meeting live via the Internet are posted at www.virtualshareholdermeeting.com/DUOL2024.
On behalf of the Board of Directors and management, it is my pleasure to express our appreciation for your continued support.
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Luis von Ahn
Co-Founder, Chief Executive Officer and Chairman of the Board




Notice of Annual Meeting of Stockholders
To be held on June 12, 2024
Notice is hereby given that the Annual Meeting of Stockholders of Duolingo, Inc., a Delaware corporation, will be held on Wednesday, June 12, 2024, at 11:30 a.m., Eastern Time.
The Annual Meeting will be a completely virtual meeting, which will be conducted via live webcast. You will be able to attend the Annual Meeting online and submit your questions during the meeting by visiting www.virtualshareholdermeeting.com/DUOL2024 and entering your 16-digit control number included on your Notice of Internet Availability of Proxy Materials or your proxy card.
For instructions on how to attend and vote your shares at the Annual Meeting, see the information in the accompanying Proxy Statement in the section titled “General Information about the Annual Meeting and Voting—How can I attend and vote at the Annual Meeting?”
The Annual Meeting is being held:
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To elect Luis von Ahn, Ph.D., Sara Clemens and Severin Hacker, Ph.D. as Class III directors to hold office until the Company’s annual meeting of stockholders to be held in 2027 and until their respective successors have been duly elected and qualified;
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To ratify the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2024;
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To approve, on an advisory (non-binding) basis, the compensation of our named executive officers; and
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To transact such other business as may properly come before the Annual Meeting or any continuation, postponement or adjournment thereof.
These items of business are described in the Proxy Statement that follows this notice. Holders of record of our common stock, composed of Class A common stock and Class B common stock, as of the close of business on April 15, 2024 are entitled to notice of and to vote at the Annual Meeting, or any continuation, postponement or adjournment thereof.
Your vote is important. Voting your shares will ensure the presence of a quorum at the Annual Meeting and will save us the expense of further solicitation.
This Notice of Annual Meeting and Proxy Statement are first being distributed or made available, as the case may be, on or about April 25, 2024.
Please promptly vote your shares by following the instructions for voting on the Notice Regarding the Availability of Proxy Materials or, if you received a paper or electronic copy of our proxy materials, by completing, signing, dating and returning your proxy card or by Internet or telephone voting as described on your proxy card.
By Order of the Board of Directors,
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Luis von Ahn
Co-Founder, Chief Executive Officer and Chairman of the Board
Important Notice Regarding the Availability of Proxy Materials for the Annual Stockholder Meeting:
Our Proxy Statement and our Annual Report are available free of charge at www.proxyvote.com.

DUOLINGO 2024 PROXY STATEMENT
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TABLE OF CONTENTS
Page



PROPOSAL NO. 3 APPROVAL, ON AN ADVISORY (NON-BINDING) BASIS, OF THE COMPENSATION OF OUR NAMED EXECUTIVE OFFICERS (“SAY-ON-PAY” VOTE)







Forward-Looking Statements
This proxy statement (this “Proxy Statement”) contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements contained in this Proxy Statement that do not relate to matters of historical fact should be considered forward-looking statements, including, without limitation, statements regarding our business plans and strategies and our corporate responsibility and impact initiatives. Without limiting the generality of the foregoing, you can identify forward-looking statements because they contain words such as “may,” “will,” “shall,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential,” “goal,” “objective,” “seeks,” or “continue” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans, or intentions. Such forward-looking statements are neither promises nor guarantees, but involve a number of known and unknown risks, uncertainties and assumptions that may cause our actual results, performance or achievements to differ materially from those expressed or implied in the forward-looking statements due to various factors, including, but not limited to the important factors more fully detailed under the caption "Risk Factors" in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as any such factors may be updated from time to time, which are accessible on the SEC’s website at www.sec.gov and the Investor Relations section of the Company’s website at investors.duolingo.com. All forward-looking statements speak only as of the date of this Proxy Statement. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change.
Additionally, our discussion of certain environmental, social and governance and related corporate responsibility (“ESG”) matters in this or other disclosures, including our corporate website (which information contained on or available through our corporate website is not incorporated by reference into, and should not be considered to be a part of, this Proxy Statement) is informed by various ESG standards and frameworks (including standards for the measurement of underlying data) and the interests of various stakeholders. As such, such information may not, and should not be interpreted as necessarily being, “material” under the federal securities laws for SEC reporting purposes. Furthermore, much of this ESG information is subject to methodologies or third-party information that is still evolving and subject to change.





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Duolingo, Inc.
5900 Penn Avenue
Pittsburgh, Pennsylvania 15205
PROXY STATEMENT
FOR THE ANNUAL MEETING OF STOCKHOLDERS
TO BE HELD ON JUNE 12, 2024
This proxy statement (the “Proxy Statement”) and our annual report for the fiscal year ended December 31, 2023 (the “Annual Report” and, together with this Proxy Statement, the “proxy materials”) are being furnished by and on behalf of the board of directors (the “Board” or “Board of Directors”) of Duolingo, Inc. (the “Company,” “Duolingo,” “we,” “us,” or “our”), in connection with our 2024 annual meeting of stockholders (the “Annual Meeting”). The Notice of Annual Meeting and this Proxy Statement are first being distributed or made available, as the case may be, to stockholders on or about April 25, 2024.




General Information About the Annual Meeting and Voting
Meeting Information:
Date: Wednesday, June 12, 2024
Time: 11:30 am
Location: Virtual-only
When and where will the Annual Meeting be held?
The Annual Meeting will be held on Wednesday, June 12, 2024 at 11:30 a.m., Eastern Time. The Annual Meeting will be a completely virtual meeting, which will be conducted via live webcast. You will be able to attend the Annual Meeting online and submit your questions during the meeting by visiting www.virtualshareholdermeeting.com/DUOL2024 and entering your 16-digit control number included in your Notice of Internet Availability of Proxy Materials, on your proxy card or on the instructions that accompanied your proxy materials. If you lose your 16-digit control number, you may join the Annual Meeting as a “Guest” but you will not be able to vote or ask questions.
What are the purposes of the Annual Meeting?
The purpose of the Annual Meeting is to vote on the following items described in this Proxy Statement:
Proposal No. 1: Election of the director nominees listed in this Proxy Statement.
Proposal No. 2: Ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024.
Proposal No. 3: Approval, on an advisory (non-binding) basis, of the compensation of our named executive officers (“Say-on-Pay” Vote).

Are there any matters to be voted on at the Annual Meeting that are not included in this Proxy Statement?
At the date this Proxy Statement went to press, we did not know of any matters to be properly presented at the Annual Meeting other than those referred to in this Proxy Statement. If other matters are properly presented at the meeting or any adjournment or postponement thereof for consideration, and you are a stockholder of record and have submitted a proxy card, the persons named in your proxy card will have the discretion to vote on those matters for you.

DUOLINGO 2024 PROXY STATEMENT
2


How do I vote my shares without attending the Annual Meeting?
We recommend that stockholders vote by proxy even if they plan to attend the Annual Meeting and vote electronically. If you are a stockholder of record, there are three ways to vote by proxy:
By Internet:
You can vote over the Internet at www.proxyvote.com by following the instructions on the Notice and Access Card or proxy card;
By Telephone:
You can vote by telephone by calling 1-800-690-6903 and following the instructions on the proxy card; or
By Mail:
You can vote by mail by signing, dating and mailing the proxy card, which you may have received by mail.
Internet and Telephone voting facilities for stockholders of record will be available 24 hours a day and will close at 11:59 p.m., Eastern Time, on June 11, 2024.
If your shares are held in the name of a bank, broker or other holder of record, you will receive instructions on how to vote from the bank, broker or holder of record. You must follow the instructions of such bank, broker or holder of record in order for your shares to be voted.

How many votes are required to approve each proposal?
The table below summarizes the proposals that will be voted on, the vote required to approve each item and how votes are counted:
DUOLINGO 2024 PROXY STATEMENT
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ProposalVotes RequiredVoting
Options
Impact of
“Withhold” or “Abstain” Votes
Broker
Discretionary
Voting Allowed
Proposal No. 1: Election of Directors
The plurality of the votes cast. This means that the three nominees receiving the highest number of affirmative “FOR” votes will be elected as Class III directors.
“FOR ALL”
“WITHHOLD ALL”
“FOR ALL EXCEPT”
None(1)
No(3)
Proposal No. 2: Ratification of Appointment of Independent Registered Public Accounting Firm for the fiscal year ending December 31,2024.
The affirmative vote of the holders of a majority in voting power of the votes cast (excluding abstentions and broker non-votes) on such matter.“FOR”
“AGAINST”
“ABSTAIN”
None(2)
Yes(4)
Proposal No. 3: Approval, on an advisory (non-binding) basis, the compensation of our named executive officers (“Say-on-Pay” Vote)The affirmative vote of the holders of a majority in voting power of the votes cast (excluding abstentions and broker non-votes) on such matter.“FOR”
“AGAINST”
“ABSTAIN”
None(2)No(3)
(1)Votes that are “withheld” will have the same effect as an abstention and will not count as a vote “FOR” or “AGAINST” a director, because directors are elected by plurality voting.
(2)A vote marked as an “Abstention” is not considered a vote cast and will, therefore, not affect the outcome of this proposal.
(3)As this proposal is not considered a routine matter, brokers lack authority to exercise their discretion to vote uninstructed shares on this proposal.
(4)As this proposal is considered a routine matter, brokers are permitted to exercise their discretion to vote uninstructed shares on this proposal, and we do not expect any broker non-votes on this proposal.

Why did I receive a notice in the mail regarding the Internet availability of proxy materials instead of a paper copy of proxy materials?
The rules of the Securities and Exchange Commission (the “SEC”) permit us to furnish proxy materials, including this Proxy Statement and the Annual Report, to our stockholders by providing access to such documents on the Internet instead of mailing printed copies. Stockholders will not receive paper copies of the proxy materials unless they request them. Instead, the Notice of Internet Availability of Proxy Materials (the “Notice and Access Card”) provides instructions on how to access and review on the Internet all of the proxy materials. The Notice and Access Card also instructs you as to how to authorize via the Internet or telephone your proxy to vote your shares according to your voting instructions. If you would like to receive a paper or email copy of our proxy materials, you should follow the instructions for requesting such materials described in the Notice and Access Card.

DUOLINGO 2024 PROXY STATEMENT
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What does it mean if I receive more than one Notice and Access Card or more than one set of proxy materials?
It means that your shares are held in more than one account at the transfer agent and/or with banks or brokers. Please vote all of your shares. To ensure that all of your shares are voted, for each Notice and Access Card or set of proxy materials, please submit your proxy by phone, via the Internet, or, if you received printed copies of the proxy materials, by signing, dating and returning the enclosed proxy card in the enclosed envelope.
Can I vote my shares by filling out and returning the Notice and Access Card?
No. The Notice and Access Card identifies the items to be voted on at the Annual Meeting, but you cannot vote by marking the Notice and Access Card and returning it. If you would like a paper proxy card, you should follow the instructions in the Notice and Access Card. The paper proxy card you receive will also provide instructions as to how to authorize via the Internet or telephone your proxy to vote your shares according to your voting instructions. Alternatively, you can mark the paper proxy card with how you would like your shares voted, sign and date the proxy card, and return it in the envelope provided.
Who is entitled to vote at the Annual Meeting?
Holders of record of shares of our common stock, composed of our Class A common stock and our Class B common stock, as of the close of business on April 15, 2024 (the “Record Date”) will be entitled to notice of and to vote at the Annual Meeting and any continuation, postponement or adjournment thereof. At the close of business on the Record Date, there were 36,943,329 shares of our Class A common stock and 6,143,077 shares of our Class B common stock issued and outstanding and entitled to vote. The rights of holders of Class A and Class B common stock are identical, except voting and conversion rights. Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to 20 votes and is convertible at any time into one share of Class A common stock.
To attend and participate in the Annual Meeting, you will need the 16-digit control number included in your Notice and Access Card, on your proxy card or on the instructions that accompanied your proxy materials. If your shares are held in “street name,” you should contact your bank or broker to obtain your 16-digit control number or otherwise vote through the bank or broker. If you lose your 16-digit control number, you may join the Annual Meeting as a “Guest” but you will not be able to vote or ask questions. The meeting webcast will begin promptly at 11:30 a.m., Eastern Time. We encourage you to access the meeting prior to the start time. Online check-in will begin at 11:15 a.m., Eastern Time, and you should allow ample time for the check-in procedures. You will need to obtain your own Internet access if you choose to attend the Annual Meeting online and/or vote over the Internet.
What is the difference between being a “record holder” and holding shares in “street name”?
A record holder (also called a “registered holder”) holds shares in his or her name. Shares held in “street name” means that shares are held in the name of a bank, broker or other nominee on the holder’s behalf.
What do I do if my shares are held in “street name”?
If your shares are held in a brokerage account or by a bank or other holder of record, you are considered the “beneficial owner” of shares held in “street name.” The Notice and Access Card or the proxy materials, if you elected to receive a hard copy, has been forwarded to you by your broker, bank or other nominee who is considered, with respect to those shares, the stockholder of record. As the beneficial owner, you have the right to direct your broker, bank or other holder of record on how to vote your shares by following their instructions for voting. Please refer to information from your bank, broker or other nominee on how to submit your voting instructions.

DUOLINGO 2024 PROXY STATEMENT
5


How many shares must be present to hold the Annual Meeting?
A quorum must be present at the Annual Meeting for any business to be conducted. The holders of a majority in voting power of the stock issued and outstanding and entitled to vote, present in person, or by remote communication, if applicable, or represented by proxy, constitutes a quorum. If you sign and return your paper proxy card or authorize a proxy to vote electronically or telephonically, your shares will be counted to determine whether we have a quorum even if you abstain or fail to vote as indicated in the proxy materials.
Broker non-votes will also be considered present for the purpose of determining whether there is a quorum for the Annual Meeting.
What are “broker non-votes”?
A “broker non-vote” occurs when shares held by a broker in “street name” for a beneficial owner are not voted with respect to a proposal because (1) the broker has not received voting instructions from the stockholder who beneficially owns the shares and (2) the broker lacks the authority to vote the shares at their discretion. Proposals No. 1 and No. 3 are considered non-discretionary matters, and a broker will lack the authority to vote uninstructed shares at their discretion on such proposals. Proposal No. 2 is considered a discretionary matter, and a broker will be permitted to exercise its discretion to vote uninstructed shares on this proposal.
What if a quorum is not present at the Annual Meeting?
If a quorum is not present or represented at the scheduled time of the Annual Meeting, (i) the chairperson of the Annual Meeting or (ii) a majority in voting power of the stockholders entitled to vote at the Annual Meeting, present in person or by remote communication, if applicable, or represented by proxy, may adjourn the Annual Meeting until a quorum is present or represented.
How can I attend and vote at the Annual Meeting?
We will be hosting the Annual Meeting live via audio webcast. Any stockholder can attend the Annual Meeting live online at www.virtualshareholdermeeting.com/DUOL2024. If you were a stockholder as of the Record Date, or you hold a valid proxy for the Annual Meeting, you can vote at the Annual Meeting. A summary of the information you need to attend the Annual Meeting online is provided below:
Instructions on how to attend and participate via the Internet, including how to demonstrate proof of stock ownership, are posted at www.virtualshareholdermeeting.com/DUOL2024.
Assistance with questions regarding how to attend and participate via the Internet will be provided at www.virtualshareholdermeeting.com/DUOL2024 on the day of the Annual Meeting.
Webcast starts at 11:30 a.m., Eastern Time.
You will need your 16-Digit Control Number to enter the Annual Meeting.
Stockholders may submit questions while attending the Annual Meeting via the Internet.
To attend and participate in the Annual Meeting, you will need the 16-digit control number included in your Notice and Access Card, on your proxy card or on the instructions that accompanied your proxy materials. If your shares are held in “street name,” you should contact your bank or broker to obtain your 16-digit control number or otherwise vote through the bank or broker. If you lose your 16-digit control number, you may join the Annual Meeting as a “Guest” but you will not be able to vote or ask questions.

DUOLINGO 2024 PROXY STATEMENT
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Will there be a question and answer session during the Annual Meeting?
As part of the Annual Meeting, we will hold a live Q&A session, during which we intend to answer questions submitted online during or prior to the meeting that are pertinent to the Company and the meeting matters, as time permits. Only stockholders that have accessed the Annual Meeting as a stockholder (rather than a “Guest”) by following the procedures outlined above in “Who can attend the Annual Meeting?” will be permitted to submit questions during the Annual Meeting. Each stockholder is limited to no more than two questions. Questions should be succinct and only cover a single topic. We will not address questions that are, among other things:
irrelevant to the business of the Company or to the business of the Annual Meeting;
related to material non-public information of the Company, including the status or results of our business since our most recent public disclosure;
related to any pending, threatened or ongoing litigation;
related to personal grievances;
derogatory references to individuals or that are otherwise in bad taste;
substantially repetitious of questions already made by another stockholder;
in excess of the two question limit;
in furtherance of the stockholder’s personal or business interests; or
out of order or not otherwise suitable for the conduct of the Annual Meeting as determined by the Chair or Secretary in their reasonable judgment.
Additional information regarding the Q&A session will be available in the “Rules of Conduct” available on the Annual Meeting webpage for stockholders that have accessed the Annual Meeting as a stockholder (rather than a “Guest”) by following the procedures outlined above.
What if during the check-in time or during the Annual Meeting I have technical difficulties or trouble accessing the virtual meeting website?
We will have technicians ready to assist you with any technical difficulties you may have accessing the virtual meeting website. If you encounter any difficulties accessing the virtual meeting website during the check-in or meeting time, a technical assistance phone number will be made available on the virtual meeting registration page 15 minutes prior to the start time of the meeting.
How does the Board recommend that I vote?
The Board recommends that you vote:
FOR each of the director nominees to the Board set forth in this Proxy Statement.
FOR the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024.
FOR the approval of the compensation of our named executive officers.


DUOLINGO 2024 PROXY STATEMENT
7


What if I do not specify how my shares are to be voted?
If you submit a proxy but do not indicate any voting instructions, the persons named as proxies will vote in accordance with the recommendations of the Board. The Board’s recommendations are set forth above, as well as with the description of each proposal in this Proxy Statement.
Who will count the votes?
Representatives of Broadridge Financial Solutions, Inc. (“Broadridge”) will tabulate the votes, and a representative of Broadridge will act as inspector of election.
Can I revoke or change my vote after I submit my proxy?
Yes. Whether you have voted by Internet, telephone or mail, if you are a stockholder of record, you may change your vote and revoke your proxy by:
sending a written statement to that effect to the attention of our Corporate Secretary at our corporate offices, provided such statement is received no later than June 11, 2024; 
voting again by Internet or telephone at a later time before the closing of those voting facilities at 11:59 p.m., Eastern Time, on June 11, 2024;
submitting a properly signed proxy card with a later date that is received no later than June 11, 2024; or
attending the Annual Meeting, revoking your proxy and voting again.
If you hold shares in street name, you may submit new voting instructions by contacting your bank, broker or other nominee. You may also change your vote or revoke your proxy online at the Annual Meeting if you obtain a signed proxy from the record holder (broker, bank or other nominee) giving you the right to vote the shares.
Your most recent proxy card or telephone or Internet proxy is the one that is counted. Your attendance at the Annual Meeting by itself will not revoke your proxy unless you give written notice of revocation to the Company before your proxy is voted or you vote online at the Annual Meeting.
Who will pay for the cost of this proxy solicitation?
We will pay the cost of soliciting proxies. Proxies may be solicited on our behalf by directors, officers or employees (for no additional compensation) in person or by telephone, electronic transmission and facsimile transmission. Brokers and other nominees will be requested to solicit proxies or authorizations from beneficial owners and will be reimbursed for their reasonable expenses.
Where can I find the results of the Annual Meeting?
We plan to announce preliminary voting results at the Annual Meeting and we will report the final results in a Current Report on Form 8-K, which we intend to file with the SEC within the prescribed timing after the annual meeting.
Why hold a virtual meeting?
We want to use the latest technology to provide expanded access, improved communication and cost savings for our stockholders and the Company while providing stockholders the same rights and opportunities to participate as they would have at an in-person meeting. Furthermore, as part of our effort to maintain a safe and healthy environment for our directors, members of management and stockholders who wish to attend the Annual Meeting, we believe that hosting a virtual meeting is in the best interest of the Company and its stockholders and a virtual meeting enables increased stockholder attendance and participation because stockholders can participate from any location around the world.
DUOLINGO 2024 PROXY STATEMENT
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Proposal No. 1: Election of Directors
Board Size and Structure
Our amended and restated certificate of incorporation, as currently in effect (“Certificate of Incorporation”) provides that the number of directors shall be established from time to time by our Board of Directors. Our Board of Directors has fixed the number of directors at nine, and we currently have nine directors serving on the Board.
Our Certificate of Incorporation provides that the Board be divided into three classes, designated as Class I, Class II and Class III, with the number serving on each class in as equal number as possible. Each class of directors must stand for re-election no later than the third annual meeting of stockholders subsequent to their initial appointment or election to the Board, provided that the term of each director will continue until the election and qualification of his or her successor and is subject to his or her earlier death, resignation or removal. Generally, vacancies or newly created directorships on the Board will be filled only by vote of a majority of the directors then in office, or by a sole remaining director. A director appointed by the Board to fill a vacancy will hold office until the next election of the class for which such director was chosen, subject to the election and qualification of his or her successor and his or her earlier death, resignation, retirement, disqualification or removal. Proxies cannot be voted for a greater number of persons than the number of nominees named in this proposal.
Nominees for Director
Drs. von Ahn and Hacker and Ms. Clemens have been nominated by the Board to stand for election at this Annual Meeting. As the directors assigned to Class III, Drs. von Ahn and Hacker and Ms. Clemens’ current terms of service will expire at the Annual Meeting. If elected by the stockholders at the Annual Meeting, Drs. von Ahn and Hacker and Ms. Clemens will each serve for a three-year term expiring at our annual meeting of stockholders to be held in 2027 (the “2027 Annual Meeting”) and until the election and qualification of his or her successor or until his or her earlier death, resignation or removal.
Each person nominated for election has agreed to serve if elected, and management has no reason to believe that any nominee will be unable to serve. If, however, prior to the Annual Meeting, the Board of Directors should learn that any nominee will be unable to serve for any reason, the proxies that otherwise would have been voted for this nominee will be voted for a substitute nominee as selected by the Board. Alternatively, the proxies, at the Board’s discretion, may be voted for that fewer number of nominees as results from the inability of any nominee to serve. The Board has no reason to believe that any of the director nominees will be unable to serve.
Current Directors
and terms:
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Number_Image_1_001.jpg
Class I Directors:
Bing Gordon
John Lilly
Laela Sturdy
Current terms expire 2025
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Number_Image_2_001.jpg
Class II Directors:
Amy Bohutinsky
Gillian Munson
Jim Shelton
Current terms expire 2026
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Number_Image_3_001.jpg
Class III Directors:
Luis von Ahn
Sara Clemens
Severin Hacker
Current terms expire 2024
DUOLINGO 2024 PROXY STATEMENT
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Information About Board Nominees and Continuing Directors
The following pages contain certain biographical information as of April 25, 2024 for each nominee for director and each director whose term as a director will continue after the Annual Meeting, including all positions he or she holds, his or her principal occupation and business experience for the past five years, and the names of other publicly-held companies of which the director or nominee currently serves as a director or has served as a director during the past five years.
We believe that all of our directors and nominees display personal and professional integrity; satisfactory levels of education and/or business experience; broad-based business acumen; an appropriate level of understanding of our business and its industry and other industries relevant to our business; the ability and willingness to devote adequate time to the work of our Board of Directors and its committees, as applicable; skills and personality that complement those of our other directors that helps build a board that is effective, collegial and responsive to the needs of our Company; strategic thinking and a willingness to share ideas; a diversity of experiences, expertise and background; and the ability to represent the interests of all of our stockholders. The information presented below regarding each nominee and continuing director also sets forth specific experience, qualifications, attributes and skills that led our Board of Directors to the conclusion that such individual should serve as a director in light of our business and structure.
Nominees for Election to a Three-Year Term Expiring at the 2027 Annual Meeting
Class III DirectorsAgeDirector SinceCurrent Position with Duolingo
Luis von Ahn, Ph.D.
45
2011President, Chief Executive Officer, Co-Founder, and Chairman of the Board
Sara Clemens
52
2021Director
Severin Hacker, Ph.D.
39
2011Chief Technology Officer, Co-Founder and Director
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Luis_von_Ahn2.jpg
Luis von Ahn, Ph.D. has served as a member of our Board of Directors and as our Chief Executive Officer since August 2011, when he co-founded Duolingo with Dr. Hacker. Prior to founding Duolingo, he served as the Chief Executive Officer of reCAPTCHA, Inc., a fraud detection technology company, from 2007 until its acquisition by Google in 2009. Dr. von Ahn has served on the board of directors of Root, Inc., a publicly-traded technology company focusing on personal insurance, from October 2020 to October 2022. Dr. von Ahn holds a B.S. in Mathematics from Duke University and a Ph.D. in Computer Science from Carnegie Mellon University.
We believe Dr. von Ahn is qualified to serve as a member of our Board of Directors because of his perspective and experience building and leading our business as co-founder and Chief Executive Officer.

DUOLINGO 2024 PROXY STATEMENT
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https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Sara_Clemens2.jpg
Sara Clemens has served as a member of our Board of Directors since June 2020. Ms. Clemens served as the Chief Operating Officer at Twitch from January 2018 to February 2022. From 2014 to 2017, she served as the Chief Operating Officer at Pandora Media and, from 2012 to 2013, she served as the Vice President of Corporate Development at LinkedIn. Ms. Clemens is currently a Senior Advisor to Blackstone Growth, and serves on the board of directors of Khosla Ventures Acquisition Co. III and Karat. Ms. Clemens holds a B.A. in English and an M.A. (Hons) from the University of Canterbury, New Zealand.
We believe Ms. Clemens’s is qualified to serve as a member of our Board of Directors due to her extensive international business, information services and technology, financial literacy, legal and regulatory compliance, executive compensation, business development and risk management experience, together with her senior leadership roles at other technology companies.
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Severin_Hacker2.jpg
Severin Hacker, Ph.D. has served as a member of our Board of Directors and as our Chief Technology Officer since August 2011, when he co-founded Duolingo with Dr. von Ahn. Dr. Hacker holds a B.S. in Computer Science from Eidgenossische Technische Hochschule Zurich, Switzerland and a Ph.D. in Computer Science from Carnegie Mellon University.
We believe Dr. Hacker is qualified to serve as a member of our Board of Directors because of his perspective and experience building and leading our business as co-founder and Chief Technology Officer.

DUOLINGO 2024 PROXY STATEMENT
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Class I Directors Whose Term Expire at the 2025 Annual Meeting of Stockholders
Class I DirectorsAgeDirector SinceCurrent Position at Duolingo
Bing Gordon
74
2020Director
John Lilly
53
2021Director
Laela Sturdy
46
2020Director
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Bing_Gordon2.jpg
Bing Gordon has served as a member of our Board of Directors since February 2020. Since June 2008, Mr. Gordon has served as a partner at Kleiner Perkins Caufield & Byers, a venture capital firm. From 1998 to 2009, he served as the Executive Vice President and Chief Creative Officer of Electronic Arts, a gaming company he co-founded. Mr. Gordon served on the board of directors of Zynga Inc., a publicly-traded video game developer, from July 2008 until its acquisition by Take Two Interactive Software, Inc, a publicly-traded video game developer. He currently serves on the board of directors of Take Two. Mr. Gordon is a special advisor to the board of directors of Amazon, and was previously a member of its board from 2003 to 2018. Mr. Gordon holds a B.A. in English from Yale and an M.B.A. from the Stanford Graduate School of Business.
We believe Mr. Gordon is qualified to serve as a member of our Board of Directors due to his extensive corporate governance, business development, strategic planning, and executive compensation experience, together with his senior leadership roles at other technology companies.
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-John_Lilly_High Rez Square2.jpg
John Lilly has served on our Board of Directors since December 2021. Mr. Lilly is a venture partner at Greylock Partners, a venture capital firm, where he has served since January 2011. Prior to this, Mr. Lilly was with Mozilla Corporation, the organization behind Firefox, the open source Web browser, which he joined in 2005 as Vice President of Business Development, from 2006 to 2008 was Chief Operating Officer and member of its Board of Directors and, and from 2008 to 2010 was Chief Executive Officer. Mr. Lilly was the founder, Chief Executive Officer, Chief Technology Officer and Vice President of products for Reactivity, a software company acquired by Cisco Systems in 2007. Previously, he held staff positions at Apple, Sun Microsystems and Trilogy Software. Lilly has been an active participant in open source projects, serving on the boards of the Open Source Applications Foundation and Participatory Culture Foundation. Mr. Lilly earned a B.Sc. and M.Sc. in computer science from Stanford University.
We believe Mr. Lilly is qualified to serve as a member of our Board of Directors due to his extensive sales, marketing, business development, strategic planning, and executive compensation experience, together with his senior leadership roles and investment experience at other technology companies.
DUOLINGO 2024 PROXY STATEMENT
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https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Laela_Sturdy2.jpg
Laela Sturdy has served as a Managing Partner at CapitalG, the growth investment fund financed by Alphabet Inc., since March 2023, previously serving as General Partner at CapitalG from 2013 to 2023. Previously, Ms. Sturdy held several roles at Google, including Managing Director, Emerging Businesses. Since March 2021, Ms. Sturdy has served on the board of directors of UiPath, Inc., a publicly-traded process automation software company, and previously served on the board of directors of Care.com from July 2016 to May 2019. Ms. Sturdy holds an A.B. in Biochemistry from Harvard College, an M.Sc. in Multimedia Systems from Trinity College Dublin and an M.B.A. from the Stanford Graduate School of Business.
We believe Ms. Sturdy is qualified to serve as a member of our Board of Directors due to her extensive corporate governance, financial literacy, information services and technology, business development and strategic planning experience, together with her senior leadership roles and her background in investing in and fostering the growth of other technology companies.
Class I Directors Whose Term Expire at the 2026 Annual Meeting
Class II DirectorsAgeDirector SinceCurrent Position at Duolingo
Amy Bohutinsky
49
2020Director
Gillian Munson
53
2019Director
Jim Shelton
56
2020Director
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Amy_Bohutinsky2.jpg
Amy Bohutinsky has served as a member of our Board of Directors since June 2020. From 2005 to 2019, she held various leadership roles at Zillow Group, Inc., a publicly-traded online real estate marketplace company, including most recently as the Chief Operating Officer, from August 2015 to 2019, and as the Chief Marketing Officer, from March 2011 to August 2015. From 2001 to 2005, Ms. Bohutinsky served in various leadership positions at Hotwire, Inc., an online travel company, including Director of Corporate Communications. Ms. Bohutinsky has consulted as a venture partner at TCV, a private equity and venture capital firm, since 2019. Ms. Bohutinsky has served on the board of directors of Zillow Group since October 2018. Previously, she served on the board of directors of Gap, Inc., a publicly-traded clothing retailer, from 2018 to 2020. She also previously served on the boards of directors of HotelTonight, LLC, a privately held mobile-based hotel booking service (acquired by Airbnb, Inc. in 2019) and Avvo, Inc., a privately held online legal marketplace (acquired by Internet Brands in 2018). Ms. Bohutinsky holds a B.A. in Journalism and Mass Communications from Washington & Lee University.
We believe Ms. Bohutinsky is qualified to serve as a member of our Board of Directors due to her considerable corporate governance, legal, regulatory, public policy and marketing experience, together with her experience in senior leadership roles at other consumer-facing technology companies.
DUOLINGO 2024 PROXY STATEMENT
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https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Gillian_Munson2.jpg
Gillian Munson has served as a member of our Board of Directors since September 2019. Ms. Munson has served as the Chief Financial Officer (CFO) of Vimeo since April 2022. She was the CFO of Iora Health, Inc., a healthcare company, from January 2021 until the company’s sale in September 2021, subsequently acting as Special Advisor to the CFO of the acquiring company, One Medical. Ms. Munson was a Venture Partner at Union Square Ventures from April 2019 to July 2021 and served as CFO of XO Group Inc., the parent company of The Knot Inc., a media and technology company from 2013 to 2019. Ms. Munson’s previous positions include Managing Director at Allen & Company LLC, Vice President, Business Development at Symbol Technologies, LLC, and both Executive Director and Senior Equity Analyst at Morgan Stanley. Ms. Munson has served on the board of directors of Phreesia, Inc., a publicly-traded software company, since May 2019, and previously served on the board of directors of Monster Worldwide, Inc. from 2015 to 2016. Ms. Munson holds a B.A. in Political Science and Economics from the Colorado College in Colorado Springs.
We believe Ms. Munson is qualified to serve as a member of our Board of Directors due to her significant corporate governance, financial literacy, business development, risk management and strategic planning experience, together with her experience in senior leadership roles at consumer-facing companies, and her background in investment, banking and equity research.
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Jim_Shelton2.jpg
Jim Shelton has served as a member of our Board of Directors since October 2020. Mr. Shelton has served as the Chief Investment and Impact Officer at the Blue Meridian Partners, a nonprofit funding collaborative, since January 2020, and a Partner of Amandla Enterprises, an impact investment and advisory firm, since July 2018. From July 2016 to July 2018, he served as the President of Education for the Chan Zuckerberg Initiative. From June 2015 to July 2016, Mr. Shelton previously served as the President and Chief Impact Officer of 2U, Inc., an educational technology company. From 2009 to 2015, he held various roles at the US Department of Education, most recently as Deputy Secretary and Chief Operating Officer. Mr. Shelton holds a B.A. in Computer Science from Morehouse College and an M.S. in Education and an M.B.A. from the Stanford Graduate School of Business.
We believe Mr. Shelton is qualified to serve as a member of our Board of Directors due to his extensive experience in senior leadership roles at public companies and in the government, along with his depth of experience in the education sector.
We believe Mr. Shelton is qualified to serve as a member of our Board of Directors due to his considerable corporate governance, legal, regulatory, public policy, and strategic planning experience, together with his senior leadership roles at public companies and in the government, as well as his depth of experience in the education sector.
Board Recommendation
The Board of Directors unanimously recommends a vote FOR the election of each of Luis von Ahn, Ph.D., Sara Clemens and Severin Hacker, Ph.D. as a Class III director to hold office until the 2027 Annual Meeting and until his or her successor has been duly elected and qualified. 
DUOLINGO 2024 PROXY STATEMENT
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Proposal No. 2 Ratification of Appointment of Independent Registered Public Accounting Firm
Appointment of Independent Registered Public Accounting Firm
The Audit, Risk and Compliance Committee (the “Audit Committee”) appoints our independent registered public accounting firm. In this regard, the Audit Committee evaluates the qualifications, performance and independence of our independent registered public accounting firm and determines whether to re-engage our current firm. As part of its evaluation, the Audit Committee considers, among other factors, the quality and efficiency of the services provided by the firm, including the performance, technical expertise, industry knowledge and experience of the lead audit partner and the audit team assigned to our account; the overall strength and reputation of the firm; the firm’s global capabilities relative to our business; and the firm’s knowledge of our operations. Deloitte & Touche LLP has served as our independent registered public accounting firm since 2018. Neither the accounting firm nor any of its members has any direct or indirect financial interest in or any connection with us in any capacity other than as our auditors and providing audit and permissible non-audit related services. Upon consideration of these and other factors, the Audit Committee has appointed Deloitte & Touche LLP to serve as our independent registered public accounting firm for the fiscal year ending December 31, 2024.
Although ratification by our stockholders of this auditor appointment is not required by our amended and restated bylaws (“Bylaws”) or otherwise, the Board is submitting the selection of Deloitte & Touche LLP to our stockholders for ratification because we value our stockholders’ views on the Company’s independent registered public accounting firm and believe that it is a good corporate governance practice. If our stockholders do not ratify the selection, it will be considered as notice to the Board and the Audit Committee to consider the selection of a different firm. Even if the selection is ratified, the Audit Committee, in its discretion, may select a different independent registered public accounting firm at any time during the year if it determines that such a change would be in the best interests of the Company and its stockholders.
Representatives of Deloitte & Touche LLP are expected to attend the Annual Meeting and to have an opportunity to make a statement and be available to respond to appropriate questions from stockholders.
Audit, Audit-Related, Tax and All Other Fees
The following table sets forth the fees of Deloitte & Touche LLP, our independent registered public accounting firm, billed to Duolingo in each of the last two fiscal years.
Year Ended December 31,
20232022
Audit Fees$1,454,919$1,466,628
Audit-Related Fees
Tax Fees306,472163,447
All Other Fees
Total$1,761,391$1,630,075
Audit Fees
Audit fees consist of fees for professional services rendered for the audit of our financial statements and review of interim financial statements and related expenses.
Audit-Related Fees
Audit-related fees consist of fees for other audit-type services not reported under “Audit Fees” above.
DUOLINGO 2024 PROXY STATEMENT
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Tax Fees
Tax fees are fees for a variety of permissible services relating to tax compliance, tax planning and tax advisory services.
All Other Fees
All other fees relate to professional services not included in the categories above, including subscriptions to Deloitte’s accounting reference library.
Pre-Approval Policies and Procedures
The formal written charter for our Audit Committee requires that the Audit Committee pre-approve all audit services to be provided to us, whether provided by our principal auditor or other firms, and all other services (review, attest and non-audit) to be provided to us by our independent registered public accounting firm, other than de minimis non-audit services approved in accordance with applicable SEC rules.
The Audit Committee has adopted a policy (the “Pre-Approval Policy”) that sets forth the procedures and conditions pursuant to which audit and non-audit services proposed to be performed by our independent registered public accounting firm may be pre-approved. The Pre-Approval Policy generally provides that the Audit Committee will not engage an independent registered public accounting firm to render any audit, audit-related, tax or permissible non-audit service unless the service is either (i) explicitly approved by the Audit Committee (“specific pre-approval”) or (ii) entered into pursuant to the pre-approval policies and procedures described in the Pre-Approval Policy (“general pre-approval”). Unless a type of service to be provided by our independent registered public accounting firm has received general pre-approval under the Pre-Approval Policy, it requires specific pre-approval by the Audit Committee or by a designated member of the Audit Committee to whom the committee has delegated the authority to grant pre-approvals. Any member of the Audit Committee to whom the committee delegates authority to make pre-approval decisions must report any such pre-approval decisions to the Audit Committee at its next scheduled meeting. If circumstances arise where it becomes necessary to engage the independent registered public accounting firm for additional services not contemplated in the original pre-approval categories or above the pre-approved amounts, the Audit Committee requires pre-approval for such additional services or such additional amounts. Any proposed services exceeding pre-approved cost levels or budgeted amounts will also require specific pre-approval. For both types of pre-approval, the Audit Committee will consider whether such services are consistent with the SEC’s rules on auditor independence.
On an annual basis, the Audit Committee reviews and generally pre-approves the services (and related fee levels or budgeted amounts) that may be provided by our independent registered accounting firm without first obtaining specific pre-approval from the Audit Committee. The Audit Committee may revise the list of general pre-approved services from time to time, based on subsequent determinations.
The above-described services provided to us by Deloitte & Touche LLP were provided in accordance with such pre-approval policies.
Board Recommendation
The Board of Directors unanimously recommends a vote FOR the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024.




DUOLINGO 2024 PROXY STATEMENT
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Audit Committee Report
The Audit Committee operates pursuant to a charter which is reviewed annually by the Audit Committee. Additionally, a brief description of the primary responsibilities of the Audit Committee is included in this Proxy Statement under the discussion of “Corporate Governance— Audit Committee.” Under the Audit Committee charter, management is responsible for the preparation, presentation and integrity of the Company’s financial statements, the appropriateness of accounting principles and financial reporting policies and for establishing and maintaining our internal control over financial reporting. The independent registered public accounting firm is responsible for auditing our financial statements and expressing an opinion as to their conformity with accounting principles generally accepted in the United States.
In the performance of its oversight function, the Audit Committee reviewed and discussed with management and Deloitte & Touche LLP, as the Company’s independent registered public accounting firm, the Company’s audited financial statements for the fiscal year ended December 31, 2023. The Audit Committee also discussed with the Company’s independent registered public accounting firm the matters required to be discussed by the applicable requirements of the Public Company Accounting Oversight Board (the “PCAOB”) and the SEC. In addition, the Audit Committee received and reviewed the written disclosures and the letters from the Company’s independent registered public accounting firm required by applicable requirements of the PCAOB, regarding such independent registered public accounting firm’s communications with the Audit Committee concerning independence, and discussed with the Company’s independent registered public accounting firm their independence from the Company.
Based upon the review and discussions described in the preceding paragraph, the Audit Committee recommended to the Board that the Company’s audited financial statements be included in its Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC.
Submitted by the Audit, Risk and Compliance Committee of the Company’s Board of Directors
Gillian Munson (Chair)
Amy Bohutinsky
Jim Shelton
Laela Sturdy
DUOLINGO 2024 PROXY STATEMENT
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Proposal No. 3 Approval, on an advisory (non-binding) basis, of the compensation of our named executive officers (“Say-on-Pay” Vote).
Say-on-Pay
In accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and Rule 14A(a)-(1) under the Securities Exchange Act of 1934, as amended, (the “Exchange Act”), the Company requests that our stockholders cast a non-binding, advisory vote in favor of the compensation of our named executive officers as disclosed in this Proxy Statement pursuant to the SEC’s compensation disclosure rules. This proposal, commonly known as a “say-on-pay” proposal and vote, is not intended to address any specific item of compensation, but rather the overall compensation of our named executive officers and the philosophy, policies and practices described in this Proxy Statement.
After considering the voting results of the advisory vote on the frequency of our say-on-pay vote at the 2022 Annual Meeting, our board of directors has determined to hold our Say-on-Pay Vote every year.
We believe that our compensation programs and policies for the year ended December 31, 2023 were an effective incentive for the achievement of the Company’s goals, aligned with stockholders’ interest and worthy of stockholder support. We encourage our stockholders to review the “Compensation Discussion and Analysis” and “Executive Compensation Tables” sections of this Proxy Statement for additional detail regarding the compensation of our named executive officers.
As an advisory approval, this proposal is not binding upon us, our board of directors or its Compensation and Leadership Committee (the “Compensation Committee”), which is responsible for the design and administration of our executive compensation program. However, the board of directors and the Compensation Committee value the opinions of our stockholders expressed through your vote on this proposal and continually consider stockholder feedback and the results of Say-on-Pay Votes when making future compensation decisions. Accordingly, we ask our stockholders to vote “FOR” the following resolution at the Annual Meeting:
“RESOLVED, that the Company’s stockholders approve, on an advisory (non-binding) basis, the compensation of the Company’s named executive officers as described in the Compensation Discussion and Analysis and disclosed in the Summary Compensation Table and related compensation tables and narrative disclosure set forth in the Proxy Statement for the 2024 Annual Meeting of Stockholders.”
Board Recommendation
The Board of Directors unanimously recommends a vote FOR the resolution to approve, on a non-binding basis, the compensation of our named executive officers, as disclosed in the Compensation Discussion and Analysis of this Proxy Statement, the accompanying compensation tables and the related narrative disclosure of this Proxy Statement.
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Executive Officers
The table below identifies and sets forth certain biographical and other information regarding our executive officers as of April 25, 2024. There are no family relationships between or among any of our executive officers or directors.
Executive OfficerAgePositionIn Current Position Since
Luis von Ahn, Ph.D.
45
President, Chief Executive Officer, Co-Founder, and Chairman of the Board2011
Severin Hacker, Ph.D.
39
Chief Technology Officer and Director2011
Matthew Skaruppa
42
Chief Financial Officer2020
Natalie Glance, Ph.D.
56
Chief Engineering Officer2022
Robert Meese
47
Chief Business Officer2021
Stephen Chen
50
General Counsel2020
See pages 11 and 12 of this Proxy Statement for the biographies of Luis von Ahn and Severin Hacker.
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Matthew_Skaruppa2.jpg
Matthew Skaruppa has served as our Chief Financial Officer since February 2020. From January 2016 to February 2020, he served as a Vice President of Goldman Sachs. Previously, Mr. Skaruppa served as a Principal at KKR Capstone from 2010 to 2015 and as a consultant at Bain & Company from 2004 to 2008. Mr. Skaruppa holds a B.S. in Chemical Engineering from Northwestern University and an M.B.A. from the Stanford Graduate School of Business.
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-Natalie_Glance2.jpg
Natalie Glance, Ph.D. has served as our Chief Engineering Officer since November 2022, prior to which she served as our Senior Vice President of Engineering since December 2019, our Vice President of Engineering from February 2017 to December 2019 and our Director of Engineering from March 2015 to February 2017. From 2007 to 2015, Dr. Glance served as an Engineering Manager at Google. Dr. Glance holds a B.A. in Physics from Princeton University and a Ph.D. in Physics from Stanford University.
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Robert Meese has served as our Chief Business Officer since March 2021, after having served as our Chief Revenue Officer from December 2018 to March 2021 and our Vice President of Business from September 2016 to December 2018. From August 2008 to September 2016, he held various roles at Google, including most recently as Director, Global Head of Games Business Development, Google Play. Mr. Meese holds a B.S. in Economics and a B.S. in Computer Science from the University of Pennsylvania and an M.B.A. from the Massachusetts Institute of Technology.
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Stephen Chen has served as our General Counsel since March 2020. From July 2014 to February 2020, he served as Associate General Counsel for Proofpoint, Inc., an enterprise security company. Mr. Chen previously served as Associate General Counsel of Marin Software, Director and Senior Counsel, Mergers and Acquisition at VMWare, Inc. and Legal Director of Yahoo!. Mr. Chen holds a B.A. in History and a J.D. from Harvard University.
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Corporate Governance
Corporate Governance Guidelines
Our Board of Directors has adopted Corporate Governance Guidelines. A copy of these Corporate Governance Guidelines can be found in the “Governance” section of the “Investors” page of our website located at www.investors.duolingo.com, or by writing to our Secretary at our offices at 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206. Among the topics addressed in our Corporate Governance Guidelines are:
Board independence and qualifications
Executive sessions of independent directors
Selection of new directors
Director orientation and continuing education
Limits on board service
Change of principal occupation
Term limits
Director responsibilities
Director compensation
Stock ownership
Conflicts of interest
Board access to senior management
Board access to advisors
Board and committee self-evaluations
Board meetings
Meeting attendance by directors and non-directors
Meeting materials
Succession planning
Board Leadership Structure
Our Corporate Governance Guidelines provide our Board of Directors with flexibility to combine or separate the positions of Chairperson of the Board and Chief Executive Officer in accordance with its determination that utilizing one or the other structure would be in the best interests of the Company and its stockholders. If the Chairperson of the Board is a member of management or does not otherwise qualify as independent, our Corporate Governance Guidelines provide that the independent directors may appoint a lead independent director (the “Lead Director”).
Dr. von Ahn, our Founder and Chief Executive Officer, serves as Chairman of our Board and presides over meetings of our Board, holds such other powers, and carries out such other duties as are customarily carried out by the chair of a board. The Board believes that this current leadership structure is appropriate and is in the best interests of the Company and its stockholders. As the Company’s founder, and having served as Chairman and as Chief Executive Officer since that time, Dr. von Ahn possesses detailed and in‑depth knowledge of the issues, opportunities and challenges facing us and our business and, therefore, is best positioned to develop agendas that focus the Board’s time and attention on the most critical matters, while helping to minimize the potential for confusion or duplication of efforts. Serving in both these roles since the Company was founded has allowed Dr. von Ahn to be seen by participants in our industry and by our customers, business partners, investors and other stakeholders as providing strong leadership for our Company and in our industry.
We recognize that different leadership structures may be appropriate for companies in different situations and at different points in time in a company’s development and believe that no one structure is suitable for all companies. Accordingly the Board will continue to periodically review our leadership structure and make such changes in the future as it deems appropriate and in the best interests of the Company and its stockholders.
Director Independence
Under our Corporate Governance Guidelines and the applicable Nasdaq Stock Market LLC (“Nasdaq”) rules (the “Nasdaq rules”), a director is not independent unless the Board affirmatively determines that he or she does not have a relationship with us that could compromise his or her ability to exercise independent judgement in carrying out his or her responsibilities as a director. In addition, the director must not be precluded from qualifying as independent under the per se bars set forth by the Nasdaq rules.
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Our Board has undertaken a review of its composition, the composition of its committees and the independence of our directors and considered whether any director has a material relationship with us that could compromise his or her ability to exercise independent judgment in carrying out his or her responsibilities. Based upon information requested from and provided by each director concerning his or her background, employment and affiliations, including family relationships, our Board of Directors has determined that none of Mmes. Bohutinsky, Clemens, Munson, and Sturdy and Messrs. Gordon, Lilly and Shelton, representing seven of our nine directors, has a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director and that each of these directors qualifies as “independent” as that term is defined under the Nasdaq rules. In making these determinations, our Board considered the relationships that each non-employee director has with us and all other facts and circumstances known to it that our Board deemed relevant in determining their independence, including the director’s beneficial ownership of our common stock and the relationships of our non-employee directors with certain of our significant stockholders.
Board Committees
Our Board of Directors has four standing committees: an Audit Committee, a Compensation Committee, a Nominating and Corporate Governance Committee and a Mergers and Acquisitions Committee, each of which has the composition and the responsibilities described below. In addition, from time to time, special committees may be established under the direction of our Board when necessary to address specific issues. Each of the Audit Committee, the Compensation Committee, the Nominating and Corporate Governance Committee and the Mergers and Acquisitions Committee operates under a written charter.
DirectorAudit
Committee
Compensation
Committee
Nominating and 
Corporate Governance Committee
Mergers and Acquisition Committee
Amy BohutinskyXX
Sara Clemens
XChairX
Bing Gordon
Chair
John Lilly
XX
Gillian Munson
Chair
Jim Shelton
XX
Laela Sturdy
XX

Audit Committee
Our Audit Committee is responsible for, among other things:
overseeing our accounting and financial reporting process;
appointing, compensating, retaining and overseeing the work of our independent auditor and any other registered public accounting firm engaged for the purpose of preparing or issuing an audit report or related work or performing other audit, review or attest services for us;
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discussing with our independent auditor any audit problems or difficulties and management’s response;
pre-approving all audit and non-audit services provided to us by our independent auditor (other than those provided pursuant to appropriate pre-approval policies established by the Audit Committee or exempt from such requirement under the rules of the Securities and Exchange Commission);
reviewing and discussing our annual and quarterly financial statements with management and our independent auditor;
assisting the Board in its oversight of risk management in areas affecting or related to financial, legal and regulatory compliance, information technology, cybersecurity, data privacy risks, and sustainability-related risks, including climate-related financial risks;
reviewing and approving or ratifying any related person transactions;
establishing procedures for the receipt, retention and treatment of complaints received by us regarding accounting, internal accounting controls or auditing matters, and for the confidential and anonymous submission by our employees of concerns regarding questionable accounting or auditing matters;
discussing with management procedures with respect to risk assessment and risk management; and
preparing the Audit Committee report required by SEC rules.
Our Audit Committee currently consists of Amy Bohutinsky, Gillian Munson, Jim Shelton, and Laela Sturdy, with Ms. Munson serving as chair. All members of our Audit Committee meet the requirements for financial literacy under the applicable Nasdaq rules and regulations. Our Board of Directors has affirmatively determined that each member of our Audit Committee qualifies as “independent” under Nasdaq’s additional standards applicable to Audit Committee members and Rule 10A-3 of the Exchange Act of 1934, as amended (the “Exchange Act”) applicable Audit Committee members. In addition, our Board of Directors has determined that Ms. Munson qualifies as an “audit committee financial expert,” as such term is defined in Item 407(d)(5) of Regulation S-K.
Compensation Committee
Our Compensation Committee is responsible for, among other things:
reviewing the compensation of the Chief Executive Officer and any other executive officer who is a member of the Board of Directors (an “Officer Director”) in light of market trends in executive compensation and make recommendations to the Board of Directors regarding compensation of the Chief Executive Officer and Officer Director;
reviewing and approving corporate goals and objectives relevant to the compensation of our executive officers other than the Chief Executive Officer and the Officer Director (“Other Executive Officers”), evaluating such Other Executive Officers performance in light of these goals and objectives and setting our Other Executive Officers compensation;

review and discuss with management and the Board of Directors our compensation philosophy and practices;
reviewing our policies, programs and initiatives focusing on diversity and belonging with respect to the Company’s leadership;

reviewing and making recommendations to our Board of Directors regarding director compensation;
reviewing and approving or making recommendations to our Board of Directors regarding our incentive compensation and equity-based plans and arrangements;
appointing and overseeing any compensation consultants;
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oversee our strategy, policies and practices relating to human capital management, including diversity, inclusion, equity, and belonging initiatives, employee culture, health and safety;

reviewing and discussing annually with management our “Compensation Discussion and Analysis,” to the extent required; and
preparing the annual Compensation Committee report required by SEC rules, to the extent required.
Our Compensation Committee currently consists of Sara Clemens, Bing Gordon and John Lilly with Mr. Gordon serving as chair. Our Board of Directors has determined that each member of our Compensation Committee qualifies as “independent” under Nasdaq’s additional standards applicable to Compensation Committee members and is a “non-employee director” as defined in Section 16b-3 of the Exchange Act.
Pursuant to the Compensation Committee’s charter, the Compensation Committee has the authority to retain or obtain the advice of compensation consultants, legal counsel and other advisors to assist in carrying out its responsibilities. Before selecting any such consultant, counsel or advisor, the Compensation Committee reviews and considers the independence of such consultant, counsel or advisor in accordance with applicable Nasdaq rules. We must provide appropriate funding for payment of reasonable compensation to any advisor retained by the Compensation Committee.
Compensation Consultants
The Compensation Committee has the authority under its charter to retain outside consultants or advisors, as it deems necessary or advisable. In accordance with this authority, during 2023, the Compensation Committee has engaged the services of Compensia as its independent outside compensation consultant.
As requested by the Compensation Committee, in 2023, Compensia’s services to the Compensation Committee included: assisting us in developing our peer group composition, analyzing benchmarking data with respect to our executives’ overall individual compensation and providing information regarding current trends and developments in executive compensation, equity-based awards, severance agreements and employee stock purchase programs based on our peer group.
All executive compensation services provided by Compensia during 2023 were conducted under the direction or authority of the Compensation Committee, and all work performed by Compensia was approved by the Compensation Committee. Neither Compensia nor any of its affiliates maintains any other direct or indirect business relationships with us or any of our subsidiaries. The Compensation Committee evaluated whether any work provided by Compensia raised any conflict of interest for services performed during 2023 and determined that it did not.
During 2023, Compensia did not provide any services to us other than advising on 1) executive, employee and director compensation and 2) broad-based plans that do not discriminate in scope, terms, or operation, in favor of our executive officers or directors, and that are available generally to all salaried employees.
Nominating and Corporate Governance Committee
Our Nominating and Corporate Governance Committee is responsible for, among other things:
identifying individuals qualified to become members of our Board and ensure the Board has the requisite expertise and consists of persons with sufficiently diverse and independent backgrounds;
recommending to our Board the persons to be nominated for election as directors and to each committee of the Board;
developing and recommending to our Board corporate governance guidelines, and reviewing and recommending to our Board proposed changes to our corporate governance guidelines from time to time; and
overseeing the annual evaluations of our Board, its committees and management.
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Our Nominating and Corporate Governance Committee currently consists of Amy Bohutinsky, Sara Clemens and Jim Shelton, with Ms. Clemens serving as chair. Our Board has determined that each member of our Nominating and Corporate Governance Committee qualifies as “independent” under applicable Nasdaq rules applicable to Nominating and Corporate Governance Committee members.
Mergers and Acquisitions Committee
Our Merger and Acquisition Committee is responsible for, among other things:
reviewing, assessing, and approving certain acquisitions, investments, mergers, and similar strategic transactions in accordance with the transaction approval authority parameters;
negotiating on behalf of the Company, the price, structure, form, terms and conditions of any such applicable Transactions, and the form, terms and conditions of any and all agreements as shall be deemed necessary, appropriate or advisable in connection with any such Transaction; and
Overseeing due diligence processes with respect to acquisitions, divestitures, and investment strategies.
Our Mergers and Acquisitions Committee currently consists of Sara Clemens, John Lilly and Laela Sturdy.
Board and Board Committee Meetings and Attendance
During 2023, our Board of Directors met five times, the Audit Committee met four times, the Compensation Committee met four times and the Nominating and Corporate Governance Committee met two times. In 2023, each of our incumbent directors then-serving attended at least 75% of the aggregate meetings of the Board and committees on which he or she served as a member.
Executive Sessions
The independent directors meet at least twice a year in a private session that excludes management and any non-independent directors. The independent directors in attendance determine which member will preside at such session.
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Director Attendance at Annual Meeting of Stockholders
We do not have a formal policy regarding the attendance of our Board members at our annual meetings of stockholders, but we expect all directors to make every effort to attend any meeting of stockholders. Four of our board members attended our annual meeting of stockholders held in 2023.
Director Nominations Process
The Nominating and Corporate Governance Committee is responsible for recommending candidates to serve on the Board and its committees. In considering whether to recommend any particular candidate to serve on the Board or its committees or for inclusion in the Board’s slate of recommended director nominees for election at the annual meeting of stockholders, the Nominating and Corporate Governance Committee considers the criteria set forth in our Corporate Governance Guidelines. Specifically, the Nominating and Corporate Governance Committee considers candidates who have a high level of personal and professional integrity, strong ethics and values and the ability to make mature business judgments and may take into account many factors, including, but not limited to: personal and professional integrity, ethics and values; experience in corporate management, such as serving as an officer or former officer of a publicly held company; strong finance experience; relevant social policy concerns; experience relevant to the Company’s industry; experience as a board member or executive officer of another publicly held company; relevant academic expertise or other proficiency in an area of the Company’s operations; diversity of expertise and experience in substantive matters pertaining to the Company’s business relative to other board members; diversity of background and perspective, including, but not limited to, with respect to age, gender, race, place of residence and specialized experience, gender identification or identification as an underrepresented minority or as LGBTQ+, practical and mature business judgment, including, but not limited to, the ability to make independent analytical inquiries; and any other relevant qualifications, attributes or skills. In determining whether to recommend a director for re-election, the Nominating and Corporate Governance Committee will also consider the director’s past attendance at meetings and participation in and contributions to the activities of the Board.
We consider diversity, such as gender, race, ethnicity and membership of underrepresented communities, a meaningful factor in identifying director nominees and view such diversity characteristics as meaningful factors to consider, but do not have a formal diversity policy. The Board evaluates each individual in the context of the Board as a whole, with the objective of assembling a group that has the necessary tools to perform its oversight function effectively in light of the Company’s business and structure. In determining whether to recommend a director for re-election, the nominating and corporate governance committee may also consider potential conflicts of interest with the candidate’s other personal and profession pursuits, the director’s past attendance at meetings and participation in and contributions to the activities of the Board.
In identifying prospective director candidates, the Nominating and Corporate Governance Committee may seek referrals from other members of the Board, management, stockholders and other sources, including third party recommendations. The Nominating and Corporate Governance Committee also may, but need not, retain a search firm in order to assist it in identifying candidates to serve as directors of the Company. The Nominating and Corporate Governance Committee uses the same criteria for evaluating candidates regardless of the source of the referral or recommendation. When considering director candidates, the Nominating and Corporate Governance Committee seeks individuals with backgrounds and qualities that, when combined with those of our incumbent directors, provide a blend of skills and experience to further enhance the Board’s effectiveness. In connection with its annual recommendation of a slate of nominees, the Nominating and Corporate Governance Committee also may assess the contributions of those directors recommended for re-election in the context of the Board evaluation process and other perceived needs of the Board.
Ms. Clemens was independently identified by a third-party search firm retained to identify potential Board members. Each of the director nominees to be elected at the Annual Meeting was evaluated in accordance with our standard review process for director candidates in connection with their nomination for reelection, as applicable, at the Annual Meeting.
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When considering whether the directors and nominees have the experience, qualifications, attributes and skills, taken as a whole, to enable the Board to satisfy its oversight responsibilities effectively in light of our business and structure, the Board focused primarily on the information discussed in each of the Board member’s biographical information set forth above. We believe that our directors provide an appropriate mix of experience and skills relevant to the size and nature of our business. This process resulted in the Board’s nomination of the incumbent directors named in this Proxy Statement and proposed for election by you at the Annual Meeting.
The Nominating and Corporate Governance Committee will consider director candidates recommended by stockholders. The Nominating and Corporate Governance Committee will review and evaluate information available to it regarding candidates proposed by stockholders and will apply the same criteria and follow substantially the same process in considering them as it does in considering other director candidates. Stockholders wishing to propose a candidate for consideration may do so by submitting their recommendation to the attention of the Corporate Secretary, Duolingo, Inc., 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206.
Board Role in Risk Oversight
The Board of Directors has overall responsibility for risk oversight, including, as part of regular Board and committee meetings, general oversight of executives’ management of risks relevant to the Company. A fundamental part of risk oversight is not only understanding the material risks a company faces and the steps management is taking to manage those risks, but also understanding what level of risk is appropriate for the Company. The involvement of the Board of Directors in reviewing our business strategy is an integral aspect of the Board’s assessment of management’s tolerance for risk and its determination of what constitutes an appropriate level of risk for the Company. While the full Board has overall responsibility for risk oversight, it is supported in this function by its Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee. Each of the committees regularly reports to the Board.
The Audit Committee also has responsibility for oversight of risks and exposures associated with financial matters, particularly financial reporting, tax, accounting, disclosure, internal control over financial reporting, investment guidelines, credit and liquidity matters, the Company’s programs, plans and policies relating to legal and regulatory compliance and strategy, and the Company’s operational infrastructure, particularly reliability, business continuity, capacity, security, information technology, privacy and cybersecurity, and sustainability-related risks, including climate-related financial risks. Through its regular meetings with management, including the finance and legal functions, and advisors, the Audit Committee reviews and discusses significant areas of our business and summarizes for the Board areas of risk and the appropriate mitigating factors. The Compensation Committee philosophy and practices applicable to all employees and evaluating compensation policies and practices that could mitigate such risks. The Nominating and Corporate Governance Committee assists the Board by overseeing and evaluating programs and risks associated with Board organization, membership and structure, and corporate governance. In addition, our Board receives periodic detailed operating performance reviews from management.
Committee Charters and Corporate Governance Guidelines
Our Corporate Governance Guidelines, charters of the Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee and other corporate governance information are available under the Governance section of the Investor Relations page of our website located at www.investors.duolingo.com, or by writing to our Corporate Secretary at our offices at 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206.
Code of Business Conduct and Ethics
We have adopted a Code of Ethics and Conduct (the “Code of Conduct”) that applies to all of our directors, officers and employees, including our principal executive officer, principal financial officer or controller, or persons performing similar functions. Our Code of Conduct is available under the Governance section of the Investor Relations page of our website located at www.investors.duolingo.com. In addition, we intend to post on our website all disclosures that are required by law or the Nasdaq rules concerning any amendments to, or waivers of, any provisions of our Code of Conduct.
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Anti-Hedging Policy
Our Board of Directors has adopted an Insider Trading Compliance Policy, that prohibits our directors, officers and employees, as well as persons and entities over which they have control, from engaging in hedging or monetization transactions, such as zero-cost collars and forward sale contracts, that allow an insider to lock in much of the value of his or her stock holdings, often in exchange for all or part of the potential for upside appreciation in the stock. These transactions allow the insider to continue to own the covered securities, but without the full risks and rewards of ownership. When that occurs, the insider may no longer have the same objectives as the Company’s other stockholders.
Communications with the Board
Any stockholder or any other interested party who desires to communicate with our Board of Directors, our non-management directors or any specified individual director, may do so by directing such correspondence to the attention of the Corporate Secretary at our offices at 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206. The Corporate Secretary will forward the communication to the appropriate director or directors as appropriate.
Board Diversity Matrix (as of April 25, 2024)
Total Number of Directors9
FemaleMaleNon-BinaryDid Not Disclose
Gender
Part I: Gender Identity
Directors45
Part II: Demographic Background
African American or Black1
Alaskan Native or American Indian
Asian
Hispanic or Latinx1
Native Hawaiian or Pacific Islander
White43
Two or More Races or Ethnicities
LGBTQ+1
Did Not Disclose Demographic Background

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Corporate Responsibility and Impact
Corporate responsibility is intrinsically linked to our mission, our business model, and ultimately our long-term success. Our founders started Duolingo with a singular mission: To develop the world’s best education and make it universally available. When we went public in 2021, CEO Luis von Ahn said in his letter to stockholders:
“I plan to dedicate my life to building a future in which, through technology, every person on this planet has access to the best quality of education. And not only that, but a future in which people want to spend their time learning.”
We remain committed to building that future.
We have been practicing many elements of corporate responsibility for years, but we are still early in publicly reporting on those elements. Our commitment to corporate responsibility is overseen by our Board of Directors:
The Compensation Committee oversees our human capital, Diversity, Equity, Inclusion and Belonging (“DEIB”) and Health and Safety;
The Audit Committee oversees climate-risk, our cyber security program and compliance with the code of ethics; and
The Nomination and Governance Committee oversees the board composition and appropriately considers the diversity of our board’s composition.
At the management level, our ESG working group is made up of leaders from different departments who get together to implement the day-to-day elements of our corporate responsibility initiatives.
Our corporate responsibility and impact efforts fall into the following categories:
Our learners. We put learners first. Millions of people around the world, and across the socioeconomic spectrum, use our platform every day for free including those trying to learn a new language in order to get a higher paying job, as well as displaced people learning the language of their new community in order to access critical services they need. We also provide our English proficiency test, the Duolingo English Test, at a much lower price than other tests to reduce barriers to access, while also offering fee waivers, so those who are most in need can take our test for free. We take product quality and efficacy seriously, employing experts in learning science to help align our content with international standards. We are also committed to responsible marketing practices, and protecting the privacy and security of our learners' data, and have implemented several measures to improve data privacy and security, including access controls, firewalls, and risk audits.
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Our people. Our employees, known internally as “Duos,” are fundamental to successfully carrying out our mission. When Luis and Severin started Duolingo, they set out to build an environment where people enjoy coming to work and feel like they belong. Duos come to work for us because we are mission-driven, and because we offer them a chance to express their potential, in all its forms. We are committed to supporting the development of Duos’ careers throughout their time at Duolingo. This includes our robust performance review and feedback process, which takes place twice a year and allows managers to set clear expectations and each Duo to gauge their performance. We also invest substantially in training managers, and in 2024, we are piloting a formal mentorship program. We conduct an employee engagement survey twice a year, and consistently see participation rates around 90%, and engagement scores higher than industry benchmarks. We have a workplace DEIB plan with clear goals to cultivate a diverse workforce that promotes equity, inclusion, and belonging regardless of an individual’s background. Our DEIB plan focuses on increasing the representation of historically underrepresented groups, including through initiatives focused on increasing the pipeline of qualified candidates and retaining the diversity of our existing workforce, investing in anti-discrimination training, and additional inclusion efforts. For clarity, it is our policy to not make employment (including hiring, promotion, or compensation) decisions on the basis of any legally protected characteristic, and to consider DEIB efforts through the lens of legal compliance. As part of our DEIB strategy, we review and audit our performance and pay practices to promote equity throughout the company and across diverse groups. We use a third party to conduct performance and pay equity assessments twice a year, coinciding with each performance and compensation cycle.
Our Communities. We are proud to be a Pittsburgh-based company and we work hard to be a good neighbor and a good global corporate citizen. In Pittsburgh, for example, we are extremely proud of our Early Learners First initiative. This program focuses on improving the quality of early childhood education and care in our local community within one mile of our headquarters. We have pledged $1 million per year towards achieving these goals. In the first phase, we provided local childcare centers with the necessary investments to improve their services, retain staff, and adopt sustainable business practices. We have also launched a Community Arts Program that awards funding to local individual artists and art organizations that provide community members with arts education and professional development opportunities. Globally, we supported Ukraine relief efforts by donating 2023 ad revenue from the Ukrainian course to United Nations High Commissioner for Refugees, the International Rescue Committee, Clear Global/Translators Without Borders, and Ukraine Global Scholars and we gave away more than 5,000 Super Duolingo accounts through an existing partnership with the International Rescue Committee (IRC), supporting refugee families seeking employment and economic stability.
Our Planet. At Duolingo, we understand that we play a role in the protection of our environment, in reducing our impact on the planet and limiting our contribution to climate change. We have a number of sustainability initiatives in place to help reduce our environmental footprint. We have recycling and composting programs throughout our offices, our newest office space is in a LEED silver building, and we donated over 8,000 pounds of food in 2023 to help reduce waste and associated emissions. As part of our corporate responsibility, we also purchased offsets. As standards and expectations regarding greenhouse gas (GHG) accounting and the processes for measuring and counting GHG emissions and reductions are evolving, this approach may be considered inconsistent with common or best practices for GHG emissions accounting and emissions reduction strategies more generally. As such, our approach to climate-related initiatives and performance, including but not limited to any use of offsets, may change in future.
We are very proud of the impact we have around the world through our products. We will continue to share the progress we are making on our corporate responsibility and impact initiatives. We have a working group composed of senior leaders and cross functional team members from key business functions whose purpose it is to oversee policies and practices related to our corporate responsibility and impact, and we will be reporting to the board throughout 2024 on our progress.

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Compensation Discussion and Analysis
This section explains the principles and practices that guide our executive compensation program, and the compensation paid to our “named executive officers” (NEOs) in 2023.
For 2023, our NEOs and their positions were as follows:
Luis von Ahn, our Chief Executive Officer, Co-Founder and Board Chairman;
Matthew Skaruppa, our Chief Financial Officer;
Natalie Glance, our Chief Engineering Officer;
Robert Meese, our Chief Business Officer; and
Stephen Chen, our General Counsel.

Executive Summary
Business Context
We had another strong year in 2023, again outperforming our expectations and setting new records for daily and monthly active users and bookings1 in Q4. Notable highlights from our full year 2023 performance include:
Total bookings were $622.2 million, an increase of 45% from the prior year;
Subscription bookings were $495.5 million, an increase of 49% from the prior year;
Total revenues were $531.1 million, an increase of 44% from the prior year;
Net income totaled $16.1 million, compared to a net loss of $59.6 million in the prior year; and
Adjusted EBITDA2 was $93.7 million, compared to an Adjusted EBITDA of $15.5 million in the prior year.

We are excited about our trajectory, and remain focused on the five core elements of our strategy: grow users, teach better, grow subscribers, become the proficiency standard, and expand beyond language learning. We continue to believe that key to all of these is our great free product. Our free product and freemium business model enable us to grow free users organically, convert free users to paid subscribers, and are aligned with our mission to develop the best education in the world and make it universally available.
Compensation Highlights
We aim to craft an executive compensation program aligned with our strategy and with stockholder interests. Highlights of our executive compensation program include:
Pay aligned with performance. Our compensation program includes just two components, salary and equity. Accordingly, sustained stock price performance is the primary driver of named executive officers’ pay outcomes and inherently aligns their interests with those of our stockholders.
1 Bookings represent the amounts we receive from a purchase of any Duolingo subscription offering, income from advertising networks for advertisements served to our users, purchases of the Duolingo English Test, and in-app purchases of virtual goods
2 Please refer to Appendix A at the end of this Proxy Statement for a definition and reconciliation of this non-GAAP financial measure to the most directly comparable GAAP financial measure.
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Variable, “at risk” emphasis in pay mix. The vast majority of our named executive officers’ total direct compensation is awarded as equity in the form of restricted stock units (“RSUs”) – 80% on average for 2023 (excluding the CEO). Our CEO received only salary in 2023. See “Special Multi-Year Performance-Based Founder Awards” for information regarding our CEO’s previously granted equity compensation.
Ensuring compensation motivates and retains executives. We provide competitive base salaries to meet our retention objectives and meaningful equity opportunities to align pay opportunities with achievement of our financial, strategic and operational goals. Upon review of the compensation packages for our Chief Financial Officer, Chief Engineering Officer and our General Counsel as compared to peers, the Compensation Committee determined that their contributions and leadership warranted increases to their base salaries during 2023.
1377

Compensation Philosophy and Objectives
The objective of our compensation program is to allow us to hire, reward and retain the world-class talent that we need to execute on our strategy and, ultimately, achieve our mission.
We have two main pillars of our compensation program for all Duos: cash (salary) and equity (RSUs). Both pillars of compensation are tied to performance, meaning that consistent and strong performance over the long-term will equate to higher compensation.
Base salary. We provide a competitive base salary as part of our compensation program to attract, engage and retain Duos. We aim for internal equity among Duos in the same or similar roles and with similar performance and tenure, and conduct robust quantitative reviews to ensure that we achieve this goal.
Equity. Our equity awards are granted in the form of RSUs for all Duos except our co-founders, and serve as a long-term retention tool, encouraging Duos to remain with our company and build Duolingo’s value over time.
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We create and use market-based ranges by level and role for both base salary and equity grants. At present we do not provide any variable cash compensation, as we believe equity is a more appropriate vehicle to reward Duos for the success they help create, in a way that aligns their compensation outcomes with our stockholders’ interests.
The Compensation Committee evaluates our compensation philosophy and objectives on at least an annual basis to ensure our program continues to appropriately encourage, motivate and reward our NEOs.
Executive Compensation Practices
Our executive compensation policies and practices reinforce our long-term, performance-based mindset and belief that Duos should be rewarded for the success they help create. Highlights of our policies and practices include:
What We Do
PracticeDescription
Keep It Simple
Our executive compensation program includes just two components – base salary and equity. Our stock price performance is the primary driver of NEOs’ pay outcomes.
Limited Perquisites
NEOs participate in our health and welfare benefits on the same basis as all Duos. Other perquisites and personal benefits, if any, are modest and only provided if they serve a sound business purpose.
Double-Trigger Change in Control Requirement
The accelerated vesting of equity awards requires both a change in control and a qualifying termination during a short period prior to or following such change in control.
Compensation At-Risk
The vast majority of our NEOs’ compensation is “at risk” and tied to our equity to align their interests with those of our stockholders.
Encourage Taking the Long View
We provide significant equity-based compensation with multi-year vesting schedules to encourage durable growth and consistent, well-rounded performance.
Annual Compensation Review
The Compensation Committee annually reviews our compensation philosophy, practices and programs, including whether such philosophy and practices are aligned with our goal of serving all stakeholders over the long-term.
Independent Compensation Committee
Our Compensation Committee is comprised solely of independent directors.
What We Don’t Do
PracticeDescription
Retirement Programs
Other than our Section 401(k) plan generally available to all employees, we do not offer defined benefit or contribution retirement plans or arrangements or nonqualified deferred compensation plans or arrangements for any Duos, including NEOs.
Hedging and Pledging TransactionsOur Insider Trading Compliance Policy prohibits all Duos, including our independent directors and NEOs, from engaging in hedging transactions. All pledging is prohibited unless specifically approved by the Board of Directors. None of our NEOs has pledged any of our securities.
Tax Payments
We do not provide tax reimbursement payments, also known as “gross-ups”.
Guaranteed Short-Term Incentives
We do not maintain a formal bonus plan or otherwise provide regular cash bonuses to our NEOs.
Dividends
We do not pay dividends or dividend equivalents on unvested equity awards.

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Compensation Determination Process
Role of the Compensation Committee
Our Compensation Committee acts on behalf of the Board of Directors in overseeing the compensation structure, programs, policies and practices applicable to our executive officers. This includes review of our compensation programs, assessment of our compensation risk profile, establishing our compensation peer group and review of our compensation structure and pay mix to ensure alignment with the compensation philosophy and objectives it has established.
In the first quarter of each year the Compensation Committee performs an initial review of the base salary levels and equity incentive opportunities of our executive officers, including our NEOs. In the second quarter, the Compensation Committee then reassesses these opportunities based on year-to-date performance to determine if any adjustments are needed or appropriate.
The Compensation Committee reviews and approves the compensation of our executive officers, except our co-founders Luis von Ahn and Severin Hacker, for whom the Compensation Committee makes recommendations for review and approval by the independent directors of our Board.
In making decisions about the compensation of our NEOs, the Compensation Committee takes a well-rounded approach that considers a number of factors, which may include:
Our executive compensation program objectives;
Our corporate growth and other elements of financial performance;
The individual performance of each executive officer against his or her management objectives;
Relevant competitive market data and analyses prepared by our compensation consultant;
The expected future contribution of each individual executive officer in furthering achievement of our financial; operational and strategic objectives;
The cost of replacing an executive officer;
The current outlook of the technology executive labor market generally;
The value and structure of historical compensation awards made to our executive officers; and
Internal pay equity, taking into consideration each individual’s impact on our business and performance.

These factors provide a framework for decision-making regarding compensation opportunities and final compensation determinations for each NEO. No single factor is determinative in the Compensation Committee’s decision-making, or weighted in any predetermined manner. Rather, the Compensation Committee members arrive at compensation decisions after considering relevant factors in light of their individual experience, business judgment and knowledge of the Company, each NEO, and the competitive market.

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Role of the Chief Executive Officer
In performing its responsibilities, the Compensation Committee consults with members of our management, including our CEO, Chief People Officer and CFO. Management assists the Compensation Committee by providing information on corporate and individual performance, market compensation data and management’s perspective on compensation matters. The Compensation Committee solicits and reviews our CEO’s recommendations and viewpoints with respect to adjustments to salary and equity incentive opportunities, program structures and other compensation-related matters for our executive officers, other than with respect to the CEO’s own compensation. The Compensation Committee considers these recommendations as one factor in determining the compensation of our executive officers, including our NEOs. Our co-founders are not present during any deliberations or decision-making regarding their respective compensation.
Role of the Compensation Consultant
In carrying out its responsibilities, the Compensation Committee has the authority to retain, and has retained, Compensia Inc., a nationally recognized compensation consulting firm, to serve as its independent compensation consultant, supporting the Compensation Committee in its review and oversight of our executive compensation programs. The Compensation Committee has assessed, and periodically confirms, the necessary criteria and has determined that the engagement of Compensia does not raise any conflicts of interest or other similar concerns. Compensia reports directly to our Compensation Committee and does not provide any non-compensation related services to the Company. Compensia does not make specific compensation-related recommendations, although it does use competitive market data to provide compensation ranges, taking into consideration our compensation peer group and compensation philosophy, for our Compensation Committee to consider. Compensia attends certain Compensation Committee meetings, executive sessions, and preparatory meetings with the committee chair and certain members of our management team, as requested by our Compensation Committee. Compensia also advises our Compensation Committee on public disclosures relating to our executive compensation programs.
Use of Market Data
The Compensation Committee reviews and considers the compensation levels and practices of a group of peer companies for purposes of assessing the competitive market positioning of our executive compensation program. This peer group includes technology companies that are similar to us in terms of industry, revenue and market capitalization, and is reviewed at least annually with our compensation consultant to account for any year-over-year changes to both our business and the businesses of our peer companies.
In developing the compensation peer group, we consider several criteria to identify comparable U.S.-based publicly-traded peer companies, including our industry sector, the size of such companies relative to our size and growth rate (generally companies with annual revenues between .5x and 2.5x of our current revenue and market capitalizations between .25x and 4x our then-current market capitalization), business model and the date such companies’ securities became publicly traded.
In March 2023, the Compensation Committee, in consultation with Compensia, conducted a detailed review of the current peer group constituents to ensure continued alignment with our business direction and financial profile. Based on the review, and desire to focus on consumer and subscription-model software companies, the Committee approved replacing six enterprise software companies with companies more comparable in financial profile, customer base, business model and/or potential talent competitors. The 2023 peer group includes the following companies.
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2023 Peer Group
AppFolio, Inc.
Coursera, Inc.
Kaltura, Inc.
Sprout Social, Inc.
Bill.com Holdings, Inc.
Cvent Holding Corporation
LivePerson, Inc.
Udemy, Inc.
Box, Inc.
Eventbrite, Inc.
nCino, Inc.
Workiva, Inc.
Bumble, Inc.
Expensify, Inc.
PagerDuty, Inc.
Yext, Inc.
Chegg, Inc.
Instructure Holdings, Inc.
PowerSchool Holdings, Inc.
Zuora, Inc.
2023 Compensation Elements & Decisions
Our executive compensation program consists of two primary components: base salary and equity. As noted in Compensation Philosophy and Objectives above, this is aligned with our compensation structure for all Duos.
ElementStructureObjective
Base SalaryCashTo attract and retain Duos by providing a market-competitive fixed level of compensation
Long-Term IncentivesEquity awards in the form of PSUs for our co-founders, including our CEO, or RSUs for all other NEOsTo engage Duos in building long-term value, in alignment with our stockholders’ interests, and to promote retention
For all NEOs except our CEO, equity is delivered in the form of annual RSU awards, that comprise the vast majority of each NEO’s pay opportunity.
In connection with the IPO of our Class A common stock in 2021, our CEO and Chief Technology Officer each received performance-based RSUs (PSUs) with a 10-year term that vest upon attainment of specified stock price hurdles, detailed under “Special Multi-Year Performance-Based Founder Awards” below. Our Board of Directors and the Compensation Committee intend for the PSUs to be the exclusive equity award that our CEO will receive through the tenth anniversary of the date of grant.
Base Salary
Consistent with our long-term oriented philosophy, base salaries represent a small portion of NEOs’ total direct compensation, and provide fixed, baseline compensation. We use our annual compensation cycles to adjust salary based on a number of factors, including performance and applicable market survey and peer data as discussed in “Compensation Determination Process.” The following table lists 2023 base salaries for each of our NEOs.
NamePositionSalary at Beginning of 2023Salary at End of 2023
% Increase
Luis von Ahn
Chief Executive Officer,
Co-Founder & Board Chairman
$750,000$750,000—%
Matthew SkaruppaChief Financial Officer$650,000$690,0006.2%
Natalie GlanceChief Engineering Officer$650,000$690,0006.2%
Robert MeeseChief Business Officer$480,000$510,0006.3%
Stephen ChenGeneral Counsel$490,000$530,0008.2%
During 2023, after considering market data for executives with similar roles and responsibilities within our peer group, as well as each individual’s current and potential future contributions to our financial, operational and strategic objectives, the Compensation Committee approved salary increases for Matthew Skaruppa, Natalie Glance, Robert Meese, and Stephen Chen as reflected in the table above.
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Long-Term Equity Incentive Awards
Our equity awards, granted in the form of RSUs for all NEOs except our CEO, serve as a long-term retention tool, encouraging executives to remain with and build Duolingo’s value over the long term. The vast majority of NEOs’ target total direct compensation is delivered in long-term equity incentives. We use time-based RSUs that typically vest over four years to retain, engage and motivate NEOs to achieve corporate objectives and sustained value creation over an extended period of time. We believe this straightforward approach to equity compensation aligns our NEOs’ interests with those of our stockholders, as the value of these RSUs are variable and directly tied to our stock. Further, we continue to believe time-based vesting appropriately incentivizes NEOs to generate long-term value for our stockholders and avoids focus on only a single or handful of metrics to the potential detriment of furthering overall corporate growth and progress. While the Committee believes this structure is most appropriate at our current stage, as part of its ongoing review of our compensation programs it will continue to consider the appropriateness of our incentive structure as we mature.
We create and reference market-based equity ranges by role, with the intention that individual RSU grant values reflect the value we place on each NEO’s contribution to our success. In determining the aggregate number of shares underlying our equity awards, the Compensation Committee also considers the dilutive effect of our equity incentive compensation practices and the overall impact that equity awards will have on stockholder value.
RSUs are typically awarded on an annual basis in the second quarter of each year. However, there may be occasions where awards are granted outside of our annual process, such as for new hires, out of cycle promotions, or to award outsized performance. RSUs typically vest in equal quarterly installments over a four-year period. Each unit represents a contingent right to receive one share of our Class A common stock upon vesting.
In May 2023, after taking into consideration the recommendations of our CEO (for all NEOs other than himself) the Compensation Committee approved RSU awards for all Duos, including our NEOs other than our CEO, in recognition of our 2022 financial results and each NEO’s scope of responsibility and individual performance. In determining the target dollar amount of each NEO’s award, the Compensation Committee also considered the value of each NEO’s existing equity holdings, including the current economic value and vesting schedules of any unvested equity awards, and the ability of those unvested holdings to satisfy our reward and retention objectives.
The RSU awards granted to our NEOs in 2023 were as follows:
NamePosition
Target $ Value (1)
# of RSUs (1)
Luis von AhnChief Executive Officer, Co-Founder & Board Chairman$—
Matthew SkaruppaChief Financial Officer$3,000,00022,250
Natalie GlanceChief Engineering Officer$3,000,00022,250
Robert MeeseChief Business Officer$1,800,00013,350
Stephen ChenGeneral Counsel$1,500,00011,125
___________________
(1)     Target dollar value differs from grant date fair value disclosed in our Summary Compensation Table. To control for possible volatility in our stock price on any given day, the number of shares underlying RSU awards is determined based on the average closing price of Class A common stock over the seven trading day period immediately prior to the date of grant. The target values approved by the Compensation Committee differ from the amounts reported in the executive compensation tables following this Compensation Discussion and Analysis, as the tables are calculated using our stock price on the date of grant (May 15, 2023) in accordance with accounting principles and SEC rules.

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Special Multi-Year Performance-Based Founder Awards
In connection with the IPO of our Class A common stock, our Board of Directors worked closely with Compensia to design a one-time equity incentive for our CEO and our CTO, each of whom is a co-founder of our company. The award was designed to significantly align their compensation with the long-term interests of our stockholders by requiring the achievement of sustained stock price targets. In designing the equity incentive for Drs. von Ahn and Hacker, our Board of Directors considered Dr. von Ahn’s and Dr. Hacker’s significant stockholdings, long-term leadership and the comparatively modest level of cash compensation they have received from us. The equity incentive is comprised of 1,200,000 and 600,000 PSUs granted to Dr. von Ahn and Dr. Hacker, respectively. The PSUs vest upon the satisfaction of both a four-year service-based condition and a performance-based condition, and generally are settled one year after vesting.
The size of the awards was determined after consideration of similar equity awards to founders of privately held and publicly traded technology companies that are serving in executive positions, and represents less than one percent of the growth in stockholder value investors will have experienced upon achievement of each price hurdle. The number of PSUs for which the performance-based condition may be satisfied is heavily weighted towards the higher stock price hurdles that require substantial, sustained stock price appreciation to be achieved, as illustrated in the table below. Our Board of Directors believes that the service-based condition in combination with challenging stock price hurdles results in a PSU award structure that effectively achieves its goals of providing meaningful retentive value and incentive to achieve long-term growth while aligning our founders’ incentives with stockholders’ interests.
The service-based condition is satisfied as to 25% of the entirety of the PSUs on each anniversary of the IPO on July 27, 2021, subject to Luis von Ahn and Severin Hacker continuing to serve as our CEO and CTO, respectively, through the applicable date. The performance-based condition will be satisfied in the event Luis von Ahn and Severin Hacker continue to serve as our CEO and CTO, respectively, through the date the 60-day trailing volume weighted average closing price of our Class A common stock reaches certain stock price hurdles, which are set at multiples of the price to the public for our IPO ($102/share), over a period of ten years, as set forth in the table below.
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TrancheStock Price HurdleNumber of PSUs for Dr. von AhnNumber of PSUs for Dr. Hacker
1 (1)$127.5060,00030,000
2 (1) $153.0060,00030,000
3 (2)$178.5060,00030,000
4 (3)
$204.00120,00060,000
5$255.00120,00060,000
6$306.00120,00060,000
7$357.00120,00060,000
8$408.00120,00060,000
9$612.00180,00090,000
10$816.00240,000120,000
___________________
(1)     Stock price hurdle for the tranche was achieved in 2021, the service condition satisfied in 2022, and shares were released to CEO and CTO on August 14, 2023

(2)     Stock price hurdle for the tranche was achieved on November 22, 2023; shares subject to one-year holding requirement

(3)     Stock price hurdle for the tranche was achieved on December 26, 2023; shares subject to one-year holding requirement

Each stock price hurdle will be equitably adjusted to reflect any stock splits, stock dividends or other restructurings impacting our Class A common stock. Any PSUs that have not satisfied the performance-based condition as of the tenth anniversary of the grant date will be forfeited. Our Board of Directors intends for the PSUs to be the exclusive equity award that our CEO and CTO will receive through the tenth anniversary of the date of grant.
In the event that Dr. von Ahn or Dr. Hacker ceases to serve as our CEO or CTO, respectively, as a result of death or disability, the service-based condition will be deemed satisfied, any vested PSUs will generally be settled, any unvested PSUs will remain outstanding and eligible to vest based on achievement of the stock price hurdles set forth above for two years, and any PSUs for which the stock price hurdle has not been met at that time will be forfeited. Unless mutually agreed otherwise, in the event Dr. von Ahn or Dr. Hacker ceases to serve as our CEO or CTO, respectively, for any reason other than death or disability, any vested PSUs will generally be settled and any unvested PSUs will be forfeited. Further, if such cessation of service is effected by us for cause, or Dr. von Ahn or Dr. Hacker engages in fraud or material misconduct, vested PSUs which have not yet been settled may be clawed back to the extent determined appropriate by our board of directors.
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In the event of a change in control, no accelerated vesting for any tranches will occur solely as a result of the change in control. Upon such event, the service-based condition will be deemed satisfied, achievement of stock price hurdles for purposes of the PSUs will be measured based on the price per share to be received by stockholders in connection with the change in control, and any PSUs for which the stock price hurdle has not been met will be forfeited. To the extent the price per share received by the stockholders in connection with the change in control falls between two stock price hurdles, the number of PSUs deemed earned based on satisfaction of the performance condition will be determined using linear interpolation between the two stock price hurdles.
As of the 2023 fiscal year end, the performance-based conditions of the first and second tranches were met on September 27, 2021 and October 1, 2021, respectively. With respect to these two tranches in combination, the service-based condition has been satisfied, and accordingly, such shares were settled on August 14, 2023. The performance-based conditions of the third and fourth tranches were met on November 22, 2023 and December 26, 2023, respectively. With respect to these two tranches in combination, the shares will be settled in November and December 2024, respectively.
Other Compensation Practices and Policies
Retirement Savings and Health and Welfare Benefits
We currently maintain a 401(k) retirement savings plan for our employees, including our NEOs, who satisfy certain eligibility requirements. Our NEOs are eligible to participate in the 401(k) plan on the same terms as other full-time employees. The Internal Revenue Code allows eligible employees to defer a portion of their compensation, within prescribed limits, on a pre-tax basis through contributions to the 401(k) plan. Currently, we match contributions made by employees who participate in the 401(k) plan up to a specified percentage of the employee contributions, and these matching contributions are fully vested as of the date on which the contribution is made. We believe that providing a vehicle for tax-deferred retirement savings through our 401(k) plan, and making matching contributions, adds to the overall desirability of our executive compensation package and further incentivizes our employees, including our NEOs, in accordance with our compensation policies. We do not provide any non-qualified deferred compensation benefits and do not have any defined benefit pension or supplemental executive retirement plans.
All of our full-time employees, including our NEOs, are eligible to participate in our health and welfare plans, including medical, dental and vision benefits; medical and dependent care flexible spending accounts; short-term and long-term disability insurance; and life and AD&D insurance.
Perquisites and Other Personal Benefits
We do not view perquisites as important to achieving our compensation objectives. As such, we currently do not provide any perquisites or other personal benefits to our NEOs beyond those made generally available to our other employees. In the future, our Board of Directors or Compensation Committee may provide perquisites to our NEOs in the event it determines that it is necessary or appropriate to incentivize or fairly compensate them.
Employment Arrangements
We entered into offer letters with each of our NEOs when they joined us. Each offer letter provides for “at will” employment (meaning either we or the NEO may terminate the employment relationship at any time with or without cause and with or without notice), sets forth the initial title, base salary, and equity award for the executive and summarizes the other terms and conditions applicable to the executive’s employment with us. Additionally, each of our NEOs has entered into a change in control and severance agreement with us, as described below, and a standard proprietary information and invention assignment agreement with us.

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Change in Control and Severance Benefits
We have entered into change in control and severance agreements with each of our NEOs. These agreements provide for severance benefits in connection with certain qualifying terminations. We believe that providing post-employment compensation arrangements is necessary to achieve our recruitment and retention goals, and to facilitate smooth transitions from Duolingo when and if appropriate. We have designed our arrangements to provide reasonable continued salary and healthcare coverage in the event of terminations without cause or resignations for good reason. In addition, we aim to align NEOs’ interests with our stockholders in the event of a change in control of the company by providing “double-trigger” arrangements that encourage executives to focus on corporate transactions that are in our best interests, regardless of whether those transactions may result in their own job loss. We also condition all severance payments upon receipt of a general release of claims to mitigate potential future disputes or litigation arising from an executive’s departure.
For a full description of the terms of these agreements, as well as an estimate of the potential payments payable under these agreements, see “Potential Payments upon Termination or Change in Control” below.
Compensation Recovery Policy (Clawback Policy)
In 2023, we adopted a compensation recovery, or “clawback,” policy (the “Clawback Policy”) in accordance with the Nasdaq listing standards and Exchange Act Rule 10D-1. Under the Clawback Policy, which applies to the Company’s current and former executive officers (as defined under Exchange Act Rule 10D-1), the Company is required to recoup the amount of any erroneously awarded compensation (as defined in the Clawback Policy) on a pre-tax basis within a specified lookback period in the event of any accounting Restatement (as defined in the Clawback Policy), subject to limited impracticability exceptions. The Clawback Policy is overseen and administered by the Compensation Committee. The full text of the Clawback Policy was included as Exhibit 97 to our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 28, 2024.
Accounting and Tax Considerations
Accounting Considerations
We follow Financial Accounting Standard Board Accounting Standards Codification Topic 718, Compensation—Stock Compensation (“ASC Topic 718”) for our stock-based compensation awards. ASC Topic 718 requires companies to measure the compensation expense for all share-based awards made to employees and directors, including stock options and RSUs, based on the grant-date fair value of these awards. This calculation is performed for accounting purposes and reported in the compensation tables below, even though our executive officers may never realize any value from their awards.
Tax Considerations
Section 162(m) of the Internal Revenue Code denies a publicly-traded corporation a federal income tax deduction for remuneration in excess of $1 million per year per person paid to executives designated in Section 162(m) of the Code, including, but not limited to, its current and former NEOs. However, we believe that maintaining the discretion to provide compensation that is non-deductible allows us to provide compensation tailored to the needs of our company and our NEOs and is an important part of our responsibilities and benefits our stockholders.

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Compensation Committee Report
The Compensation Committee has reviewed and discussed with management the Compensation Discussion and Analysis contained in this Proxy Statement. Based on their review and discussion, the Compensation Committee has recommended to the board that the Compensation Discussion and Analysis be included in this Proxy Statement and incorporated into the company’s 2023 annual report on Form 10-K.
Members of the Compensation Committee:
Bing Gordon (Chair)
Sarah Clemens
John Lilly
Executive Compensation Tables
2023 Summary Compensation Table
The following table contains information about the compensation earned by each of our named executive officers during the fiscal years presented.
Name and Principal PositionYearSalary
($)
Bonus
($)
Stock Awards
($) (1)
Option Awards
($) (2)
All Other Compensation
($) (3)
Total
($)
Luis von Ahn
Chief Executive Officer
2023750,00016,500766,500
2022750,00015,250765,250
2021540,00073,872,00019,30074,431,300
Matthew Skaruppa
Chief Financial Officer
2023673,3333,183,75316,5003,873,586
2022629,1673,178,48615,2503,822,903
2021480,15915,0001,518,11419,3002,032,573
Natalie Glance
Chief Engineering Officer
2023673,3333,183,75317,0003,874,086
2022602,9175,0003,178,48615,2503,801,653
2021461,9056,2501,334,75619,3001,822,211
Robert Meese
Chief Business Officer
2023497,5001,910,25217,7502,425,502
2022480,0001,2502,444,97615,2502,941,476
2021389,527750575,75619,300985,333
Stephen Chen
General Counsel
2023513,3331,591,87616,5002,121,709
2022448,1254,2001,711,46515,2502,179,040
2021377,38816,400300,73354,708749,229
___________________
(1)Amounts in this column represent the aggregate grant date fair value, as calculated in accordance with ASC Topic 718, of RSUs granted to our NEOs based on the closing price of Duolingo’s stock on the date of grant.
(2)See Note 9 to our audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC on February 28, 2024, for a description of the assumptions used in valuing these awards.
(3)Amounts reported for 2023 represent $16,500 matching contributions under our 401(k) plan. Amounts reported in 2023 for Dr.Glance and Mr. Meese also include $500 and $1,250, respectively, for a company-wide language challenge, a program designed to encourage employees to engage with the platform as learners.
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Grants of 2023 Plan-Based Awards
The following table shows information regarding the incentive awards granted to the named executive officers for 2023.
NameAward TypeGrant Date
Number of Stock Awards (#) (1)
Grant Date Fair Value of Stock Awards ($) (2)
Luis von Ahn
Matthew Skaruppa
Time-based RSUsMay 15, 202322,2503,183,753
Natalie Glance
Time-based RSUsMay 15, 202322,2503,183,753
Robert Meese
Time-based RSUsMay 15, 202313,3501,910,252
Stephen Chen
Time-based RSUsMay 15, 202311,1251,591,876
___________________
(1)The RSUs vest in substantially equal quarterly installments through the fourth anniversary of the vesting commencement date, subject to continued service through the applicable vesting date. Additionally, if within the period commencing three months prior to and ending twelve months immediately following a change in control, the NEO’s service is terminated by us without cause or by them for good reason, then 100% of the RSUs will vest, subject to the delivery of a release of claims in favor of us.
(2)Amounts in this column represent the aggregate grant date fair value, as calculated in accordance with ASC Topic 718, of RSUs granted to our NEOs based on the closing price of Duolingo’s stock on the date of grant.


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Outstanding Equity Awards at 2023 Year End
The following tables list all outstanding equity awards held by our NEOs as of December 31, 2023.
Option Awards (1)
Stock Awards
NameVesting Commencement DateNumber of Securities Underlying Unexercised Options (#) ExercisableNumber of Securities Underlying Unexercised Options (#) UnexercisableOption Exercise Price ($)Option Expiration DateNumber of Shares or Units That Have Not Yet Vested
Market Value of Shares or Units of Stock That Have Not Vested ($) (1)
Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights That Have Not Vested (#)
Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights That Have Not Vested ($) (1)
Luis von Ahn1/1/2019 (2)175,0007.482/14/2029
1/1/2020 (2)175,00014.4212/12/2029
1/1/2021 (2)175,00038.0812/2/2030
7/30/2021 (3)900,000204,165,000
Matthew Skaruppa2/24/2020 (2)135,15612,75714.423/10/2030
4/7/2021 (4)9,3752,126,719
5/13/2022 (4)22,1305,020,191
5/15/2023 (4)19,4694,416,543
Natalie Glance2/27/2015 (2)37,8962.232/27/2025
2/22/2017 (2)21,3345.004/7/2027
2/27/2018 (2)17,4187.114/20/2028
6/27/2019 (2)4,9197.486/27/2029
9/25/2019 (2)5,2498.159/25/2029
2/27/2020 (5)14,37914.423/10/2030
3/9/2020 (2)9,37562514.423/10/2030
5/12/2021 (4)9,3752,126,719
5/13/2022 (4)22,1305,020,191
5/15/2023 (4)19,4694,416,543
Robert Meese9/25/2019 (2)9,3758.159/25/2029
3/10/2020 (2)5,00062514.423/10/2030
9/23/2020 (2)20,00022.919/23/2030
5/12/2021 (4)3,985903,997
5/13/2022 (4)16,0023,630,054
5/15/2023 (4)11,6822,650,062
Stephen Chen3/2/2020 (2)34,5848,75014.423/10/2030
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4/7/2021 (4)1,608364,775
5/13/2022 (4)11,9162,703,145
5/15/2023 (4)9,7352,208,385
__________________
(1)Amounts are calculated by multiplying the number of shares shown in the table by $226.85 , the closing price of our Class A common stock as of December 29, 2023, the last trading day in 2023.
(2)The option vests and becomes exercisable in substantially equal monthly installments through the fourth anniversary of the vesting commencement date, subject to continued service through the applicable vesting date. Additionally, if within the period commencing three months prior to and ending twelve months immediately following a change in control, the NEO’s service is terminated by us without cause or by them for good reason, then 100% of the shares subject to each option held by them will vest and be exercisable, subject to the delivery of a release of claims in favor of us.

(3)Represents the multi-year PSU awards described above under “Special Multi-Year Performance-Based Founder Awards.” The PSUs vest upon the satisfaction of both a service-based condition and a performance-based condition and generally are settled one year after vesting. The service-based condition is satisfied as to 25% of the PSUs on each anniversary of the vesting commencement date, subject to Dr. von Ahn continuing to serve as our Chief Executive Officer through the applicable date. The performance-based condition is satisfied in ten tranches based on the achievement of ten stock price hurdles measured based on a trailing 60 day average closing trading price for our Class A common stock basis during a ten-year performance period and service-based vesting. As of December 31, 2023, performance and service-based vesting for the first four tranches of the stock price hurdles had been achieved. For additional details on the vesting of the awards, see “Special Multi-Year Performance-Based Founder Awards” above.

(4)The RSUs vest in substantially equal quarterly installments through the fourth anniversary of the vesting commencement date, subject to continued service through the applicable vesting date. Additionally, if within the period commencing three months prior to and ending twelve months immediately following a change in control, the NEO’s service is terminated by us without cause or by them for good reason, then 100% of the RSUs will vest, subject to the delivery of a release of claims in favor of us.

(5)The option vests and becomes exercisable in substantially equal monthly installments through the third anniversary of the vesting commencement date, subject to continued service through the applicable vesting date. Additionally, if within the period commencing three months prior to and ending twelve months immediately following a change in control, the NEO’s service is terminated by us without cause or by them for good reason, then 100% of the shares subject to each option held by them will vest and be exercisable, subject to the delivery of a release of claims in favor of us.


Option Exercises and Stock Vested
The following table summarizes the stock options that were exercised and the RSUs that vested during 2023.
Option AwardsStock Awards
Number of Shares Acquired on Exercise (#)
Value Realized Upon Exercise ($) (1)
Number of Shares Acquired on Vesting (#)
Value Realized Upon Vesting ($) (2)
Luis von Ahn180,000
41,154,600 (3)
Matthew Skaruppa82,25012,073,23517,8832,642,866
Natalie Glance51,0005,814,16717,8832,642,866
Robert Meese11,8131,741,724
Stephen Chen34,1674,382,9557,2281,074,534
__________________
(1)Represents the difference between the closing trading price of our Class A common stock on the date of exercise and the exercise price of the option.
(2)Reflects the product of the number of RSUs vesting multiplied by the closing price of our Class A common stock on the vesting date.

(3)Represents the portion of PSUs that were earned and vested on November 22, 2023 and December 26, 2023. The PSUs will be settled by the issuance of shares to Dr. von Ahn on or shortly after the first anniversary of the vesting dates.



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Nonqualified Deferred Compensation for Fiscal Year 2023
The following table provides information concerning the portions of the PSUs that were earned and vested but are subject to deferral for one year after vesting. The PSUs were previously reported as compensation for 2021 based on their fair value as of the grant date in the Summary Compensation Table and have also been reported in the Option Exercises and Stock Vested table for 2023 based on the closing trading price of our Class A common stock on the date of vesting. We do not maintain any other deferred compensation arrangements.
Name
Executive Contributions in 2023 ($)
Registrant Contributions in 2023 ($) (1)
Aggregate Earnings in 2023 ($) (2)
Aggregate Withdrawals/Distributions ($)
Aggregate Balance in 2023 ($) (3)
Luis von Ahn
Vested but Unsettled RSUs
41,154,600(321,600)40,833,000
__________________
(1)    Amount is also captured in the “Value Realized Upon Vesting” reflected in the Option Exercises and Stock Vested table above. Represents the value of the Class A common stock underlying the 60,000 PSUs that vested on November 22, 2023, multiplied by $218.57, the closing trading price per share of our Class A common stock on the vesting date and 120,000 PSUs that vested on December 26, 2023, multiplied by $233.67, the closing trading price per share of our Class A common stock on the vesting date.

(2)    Represents the change in value of shares of our Class A common stock subject to the vested PSUs based on the change in the closing trading price per share from the vesting dates to December 29, 2023.

(3)    Represents the value of vested PSUs for which settlement has been deferred based on $226.85, the closing trading price per share of our Class A common stock on December 29, 2023.

Potential Payments Upon Termination or Change in Control
Under the change in control and severance agreements we have entered into with our NEOs, each NEO is eligible for the following severance benefits in connection with certain qualifying terminations in exchange for a general release of claims against us.
In the event of an NEO’s termination of employment without cause or resignation for good reason not connected to a change in control:
Our CEO is entitled to (i) a single lump sum payment equal to his annual base salary and (ii) continued healthcare coverage paid or reimbursed by us for 12 months.
Other NEOs are entitled to (i) a single lump sum payment equal to six months of base salary and (ii) continued healthcare coverage paid or reimbursed by us for six months.
In the event of an NEO’s termination of employment without cause or resignation for good reason within a three-month period prior to, or twelve-month period following a change in control:
Our CEO is entitled to (i) payment of an amount equal to 1.5 times his then-current annual base salary, payable in a single lump sum, (ii) payment of a pro-rated annual bonus, if any, assuming target performance and paid in a single lump sum, (iii) continued healthcare coverage paid or reimbursed by us for up to 18 months, and (iv) accelerated vesting of all outstanding equity awards subject to time-based vesting provisions.
Other NEOs are entitled to (i) payment of an amount equal to their then-current annual base salary, payable in a single lump sum, (ii) payment of a pro-rated annual bonus, if any, assuming target performance and paid in a single lump sum, (iii) continued healthcare coverage paid or reimbursed by us for up to 12 months, and (iv) accelerated vesting of all outstanding equity awards subject to time-based vesting provisions.
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In addition, under the PSU agreement entered into between us and our CEO:
In the event of our CEO’s termination of employment due to death or disability, (i) the service-based condition applicable to his PSUs will be deemed satisfied, (ii) any vested PSUs will generally be settled and (iii) any unvested PSUs will remain outstanding and eligible to vest based on achievement of the stock price hurdles set forth above for two years (after which any unvested PSUs will be forfeited).
In the event of our CEO’s termination of employment for any other reason, generally, any vested PSUs will be settled and any unvested PSUs forfeited.
In the event of a change in control, the service-based condition applicable to the PSUs will be deemed satisfied, achievement of stock price hurdles for purposes of the PSUs will be measured based on the price per share to be received by stockholders in connection with the change in control, and any PSUs for which the stock price hurdle has not been met will be forfeited. To the extent the price per share received by the stockholders in connection with the change in control falls between two stock price hurdles, the number of PSUs deemed earned based on satisfaction of the performance condition will be determined using linear interpolation between the two stock price hurdles.
The following table provides information concerning the estimated payments and benefits that would be provided in the circumstances described above for each of our NEOs. Except where otherwise noted, payments and benefits are estimated assuming that the triggering event took place on December 31, 2023, and the price per share of our Class A common stock is the closing price as of December 29, 2023 ($226.85). There can be no assurance that a triggering event would produce the same or similar results as those estimated below if such event occurs on any other date.
Upon Qualifying Termination - Outside of Change in Control PeriodUpon Qualifying Termination - During of Change in Control PeriodUpon Disability or Death
NameCash Severance ($) (1)Continuation of Healthcare Benefits ($)Value of Accelerated Vesting ($)
(2)
Total ($)Cash Severance ($) (1)Continuation of Healthcare Benefits ($)Value of Accelerated Vesting ($)
(2)
Total ($)Value of Accelerated Vesting ($)
(2)
Luis von Ahn750,00016,58340,833,00041,599,5831,125,00024,87440,833,00041,982,87440,833,000
Matthew Skaruppa345,000345,000690,00014,273,42314,963,423
Natalie Glance345,0009,104354,104690,00018,20911,696,22212,404,431
Robert Meese255,0009,104264,104510,00018,2097,316,8827,845,091
Stephen Chen265,0009,104274,104530,00018,2097,135,0687,683,277
__________________
(1)The severance amount related to base salary was determined based on the base salaries in effect on December 31.
(2)The value of accelerated options is calculated by multiplying (i) the number of shares accelerated by (ii) any positive excess of $226.85 closing price per share of our Class A common stock on December 29, 2023, the last trading day of 2023, over the applicable exercise price, and the value of accelerated RSUs is calculated by multiplying the number of RSUs accelerated by $226.85 the closing price per share of our Class A common stock on December 31, 2023. The value of accelerated equity awards covering Class B common stock held by Dr. von Ahn was also calculated using the foregoing methodology because the Class B common stock is not publicly traded. The amounts set forth in this column also represent the value of the acceleration of equity awards in the event of a change in control of the Company where outstanding awards are not assumed or substituted, where all awards, other than the Multi-Year Award, will vest in full. In such case, the vesting of the Multi-Year Award converts to a service-based award based on the proceeds paid in the change in control and the vesting date applicable to each stock hurdle achieved or partially achieved.


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CEO Pay Ratio
Pursuant to Item 402(u) of Regulation S-K presented below is the ratio of annual total compensation of our Chief Executive Officer to the annual total compensation of our median employee (except our Chief Executive Officer).
The ratio presented below is a reasonable estimate calculated in a manner consistent with Item 402(u). The SEC’s rules for identifying the median compensated employee and calculating the pay ratio based on that employee’s annual total compensation allow companies to adopt a variety of methodologies, to apply certain exclusions, and to make reasonable estimates and assumptions that reflect their employee populations and compensation practices. As a result, the pay ratio reported by other companies may not be comparable to the pay ratio reported below, as other companies have different employee populations and compensation practices and may utilize different methodologies, exclusions, estimates and assumptions in calculating their own pay ratios.
To identify the median compensated employee, we reviewed the compensation of all full-time employees who were employed as of December 31, 2023 (the “determination date”). We determined our median employee by reviewing actual base compensation paid in 2023 as of the Determination Date plus the grant date fair value of equity awards issued in 2023 as of the determination date. We annualized actual base compensation for new hire Duos based on their start date. For Duos based outside of the United States, we converted pay into U.S. Dollars using the exchange rate for a 6-month period ending on the determination date.
The fiscal year 2023 annual total compensation as determined under Item 402 of Regulation S-K for our Chief Executive Officer was $766,500, as reported in the Summary Compensation Table. The annual total compensation as determined under Item 402 of Regulation S-K of our median employees for fiscal 2023 was $266,639. The ratio of our Chief Executive Officer’s annual total compensation to the median of the annual total compensation of all our employees for fiscal year 2023 is 2.9 to 1.
In selecting the median employee in accordance with Item 402(u) of Regulation S-K, reporting companies are permitted to use reasonable estimates, assumptions, and methodologies based on their own facts and circumstances. As a result, the disclosure regarding the compensation of our median employee and the CEO Pay Ratio may not be directly comparable to similar disclosure by other reporting companies.
Compensation Risk Assessment
Management has conducted a risk assessment of our compensation plans and practices and concluded that our compensation programs do not create risks that are reasonably likely to have a material adverse effect on the Company. The objective of the assessment was to identify any compensation plans or practices that may encourage employees to take unnecessary risk that could threaten the Company. No such plans or practices were identified. The Compensation Committee has reviewed and agrees with management’s conclusion.

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Director Compensation
Non-Employee Director Compensation Policy for Fiscal Year 2023
The following table sets forth information for 2023 regarding the compensation awarded to, earned by or paid to the non-employee directors who served on our Board of Directors during fiscal year 2023.
NameFees Earned or Paid in Cash ($)
Stock Awards ($) (1)
Total ($)
Amy Bohutinsky44,000159,949203,949
Sara Clemens48,000159,949207,949
Bing Gordon42,000159,949201,949
John Lilly40,000159,949199,949
Gillian Munson50,000159,949209,949
Jim Shelton44,000159,949203,949
Laela Sturdy44,000159,949203,949
___________________
(1)Amounts shown represent the aggregate grant date fair value, as calculated in accordance with ASC Topic 718, of RSUs granted during fiscal year 2023. See Note 9 to our audited financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC on February 28, 2024, for a description of the assumptions used in valuing these awards.

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The table below shows the aggregate number of option awards (exercisable and unexercisable) and unvested stock awards held as of December 31, 2023 by each non-employee director who was serving as of December 31, 2023.
NameShares Underlying Options OutstandingNumber of Shares or Units That Have Not Yet Vested
Amy Bohutinsky40,0001,016
Sara Clemens10,0001,016
Bing Gordon50,0001,016
John Lilly1,999
Gillian Munson25,0001,016
Jim Shelton30,0001,016
Laela Sturdy40,0001,016
Narrative Disclosure to Director Compensation Table
In connection with the IPO of our Class A common stock, we adopted a non-employee director compensation program (the “Director Compensation Program”). Pursuant to the Director Compensation Program in effect for 2023, our non-employee directors were eligible to receive cash compensation as follows:
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Position
Annual Cash Retainer ($)
Board Member30,000
Non-Executive Chair
25,000 (additional retainer)
Audit, Risk and Compliance Committee Chair20,000
Compensation Committee Chair12,000
Nominating and Corporate Governance Committee Chair8,000
Audit, Risk and Compliance Committee Member (other than Chair)10,000
Compensation Committee Member (other than Chair)6,000
Nominating and Corporate Governance Committee Member (other than Chair)4,000
Mergers and Acquisitions Committee Member 4,000
Under the Director Compensation Program in effect during 2023, each non-employee director will automatically be granted (i) RSUs covering a number of shares of our common stock calculated by dividing (a) $300,000 by (b) the closing trading price of our common stock as of the date of grant (or if the date of grant is not a trading day, the immediately preceding trading day), rounded down to the nearest whole share, upon the director’s initial appointment or election to our Board of Directors, (the “Initial Grant”), and (ii) for each non-employee director who has served for at least six months as of the date of each annual stockholders’ meeting, RSUs covering a number of shares of our common stock calculated by dividing (a) $160,000 by (b) the closing trading price of our common stock as of the date of grant (or if the date of grant is not a trading day, the immediately preceding trading day), rounded down to the nearest whole share, automatically on the date of each annual stockholders’ meeting thereafter (the “Annual Grant”). The Initial Grant will vest over three years, subject to continued service through each applicable vesting date. The Annual Grant will vest on the first anniversary of the date of grant, provided, that if our annual stockholders’ meeting immediately following the date of grant takes place prior to the first anniversary of the date of grant, the Annual Grant will vest immediately prior to our annual stockholders’ meeting following the date of grant, subject to continued service through each applicable vesting date.
In the event of a change in control (as defined in our 2021 Incentive Award Plan), each Initial Grant and Annual Grant, along with any stock options or other equity-based awards held by any non-employee director, will vest and, to the extent applicable, become exercisable immediately prior to such change in control.
In June 2023, we granted each of our non-employee directors an award of 1,016 RSUs, each of which will fully vest immediately prior to our next annual stockholders’ meeting, subject to continued service through such date.
In November 2023, the Compensation Committee engaged Compensia to conduct the first formal review of the Director Compensation Program since its adoption at the time of IPO. Based on the review, effective January 1, 2024, the Program was amended to more closely align our Director compensation practices with those of our executive compensation peer group, attract qualified Director candidates if needed and retain and fairly compensate our current Directors. Under the amended Program:
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Non-employee Board member retainer increased from $30,000 to $35,000;
Compensation Committee Chair retainer increased from $12,000 to $15,000;
Compensation Committee Member (other than the Chair) retainer increased from $6,000 to $7,500;
Initial Grant value increased from $300,000 to $360,000; and
Annual Grant value increased from $150,000 to $180,000.

Equity Compensation Plan Information
The following table summarizes securities available under our equity compensation plans as of December 31, 2023.
Plan Category
Number of securities to be issued upon exercise of outstanding options, warrants and rights
(#)
(a) (2)
Weighted average per share exercise price of outstanding options, warrants and rights
($)
(b) (3)
Number of securities remaining available under equity compensation plans (excluding securities reflected in column (a)) (4)
Equity compensation plans approved by security holders (1)
2,985,47016.0411,008,758
Equity compensation plans not approved by security holders
Total2,985,47016.0411,008,758
___________________
(1)Consists of the 2011 Equity Incentive Plan (2011 Plan), the 2021 Incentive Award Plan (2021 Plan) and the 2021 Employee Stock Purchase Plan (2021 ESPP).
(2)Includes 2,985,470 outstanding options to purchase shares under the 2011 Plan.
(3)As of December 31, 2023, the weighted-average exercise price of outstanding options under the 2011 Plan was $16.04.
(4)Includes 9,404,316 shares available for future issuance under the 2021 Plan and 1,604,442 shares available for issuance under the 2021 ESPP. Following the effective date of the 2021 Plan, we ceased making grants under the 2011 Plan. To the extent outstanding awards under the 2011 Plan are forfeited or lapse unexercised, the shares of common stock subject to such awards will be available for issuance under the 2021 Plan. The 2021 Plan provides for an annual increase to the number of shares available for issuance thereunder on the first day of each calendar year beginning on January 1, 2022 and ending on and including January 1, 2031, by an amount equal to the lesser of (A) 5% of the shares of our common stock outstanding (on an as converted basis) on the last day of the immediately preceding fiscal year and (B) such smaller number of shares of stock as determined by our Board of Directors; provided, however, that no more than 44,749,446 shares of Class A common stock may be issued upon the exercise of incentive stock options. The 2021 ESPP provided for an annual increase to the number of shares available for issuance thereunder on the first day of each calendar year beginning on January 1, 2022 and ending on and including January 1, 2031, by an amount equal to the lesser of (i) 1% of the shares of our common stock outstanding (on an as converted basis) on the last day of the immediately preceding fiscal year and (ii) such number of shares of common stock as determined by our Board of Directors; provided, however, no more than 8,390,521 shares of our common stock may be issued under the ESPP. As of the date of this Proxy Statement, we have not commenced offering periods under the 2021 ESPP. In February 2024, the Board waived the 2024 automatic annual increase of shares available for future issuance under the ESPP and may, in the future, waive such automatic annual increase as, and to the extent, additional shares do not need to be made available under the ESPP.

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Pay Versus Performance
As required by Section 953(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 402(v) of Regulation S-K, we are providing the following information about the relationship between executive compensation actually paid and certain financial performance of our company.
Pay Versus Performance Table
Year
Summary Compensation Table Total for Principal Executive Officer (“PEO”) ($) (1) (2)
Compensation Actually Paid to PEO ($) (3)
Average Summary Compensation Table Total for Non-PEO Named Executive Officers (“NEOs”)
($) (4)
Average Compensation Actually Paid to Non-PEO NEOs ($) (5)
Value of Initial Fixed $100 Investment Based on:
Net Income (Loss) (in thousands)
($) (8)
Bookings
(in thousands) ($) (9)
 Total Stockholder Return (“TSR”) ($) (6)
Peer Group Total Stockholder Return ($) (7)
(a)(b)(c)(d)(e)(f)(g)(h)
2023766,500139,895,9213,073,72012,060,643163.1987.6016,067622,181
2022
765,250(31,645,908)3,186,268493,79351.1763.21(59,574)428,647
202174,431,30078,011,81719,725,45521,789,69476.3396.35(60,135)294,427
___________________
(1)Luis von Ahn served as our principal executive officer (“PEO”) during 2021, 2022 and 2023.
(2)The dollar amounts reported in column (b) are the amounts of total compensation reported for our PEO for each corresponding year in the “Total” column of the Summary Compensation Table. Refer to “Executive Compensation – Executive Compensation Tables – 2023 Summary Compensation Table” of this Proxy Statement and our proxy statement for 2023.
(3)The dollar amounts reported in column (c) represent the amount of “compensation actually paid” to our PEO, as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual amount of compensation earned by or paid to such PEO during the applicable year. In accordance with the requirements of Item 402(v) of Regulation S-K, the following adjustments were made to the PEO’s total reported compensation for each year to determine the compensation actually paid:
YearName of PEO
Reported Summary Compensation Table for PEO ($)
(Less) Reported Value of Equity Awards ($) (a)
Plus/(Minus) Equity Award Adjustments
($) (b)
(Equals) Compensation Actually Paid ($)
2023Luis von Ahn766,500139,129,421139,895,921
2022Luis von Ahn765,250(32,411,158)(31,645,908)
2021Luis von Ahn74,431,30073,872,00077,452,51778,011,817
___________________
(a) The grant date fair value of equity awards represents the total of the amounts reported in the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table for the applicable year.
(b) The equity award adjustments for each applicable year include the addition (or subtraction, as applicable) of the following: (i) the year-end fair value of any equity awards granted in the applicable year that are outstanding and unvested as of the end of the year; (ii) the year-end fair value of any equity awards granted in a prior year that are outstanding and unvested as of the end of the year; (iii) for awards that are granted and vest in same applicable year, the fair value as of the vesting date; (iv) for awards granted in prior years that vest in the applicable year, the amount equal to the change as of the vesting date (from the end of the prior fiscal year) in fair value; (v) the dollar value of any dividends or other earnings paid on stock or option awards in the applicable year prior to the vesting date that are not otherwise reflected in the fair value of such award or included in any other component of total compensation for the applicable year, (vi) less the value of all unvested awards as of the end of the prior fiscal year. The valuation methodologies use to estimate fair values did not materially differ from those disclosed at the time of grant. The amounts deducted or added in calculating the equity award adjustments are as follows:
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YearName of PEO
Fair Value at End of Year of Outstanding and Unvested Equity Granted in a Current Year ($)
Change in Fair Value of Outstanding and Unvested Equity Granted in Prior Year ($)
Fair Value of Equity Vesting During the Year that was Granted in Current Year ($)
Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year ($)
Total Equity Award Adjustments ($)
2023Luis von Ahn120,707,39118,422,030139,129,421
2022Luis von Ahn(31,736,973)(674,184)(32,411,158)
2021Luis von Ahn76,400,687162,364889,46677,452,517

(4)     The dollar amounts reported in column (d) represent the average of the amounts reported for our NEOs as a group (excluding our PEO) in the “Total” column of the Summary Compensation Table in each applicable year. The names of each of the NEOs (excluding PEO) included for purposes of calculating the average amounts in each applicable year are as follows: (i) for 2022 and 2023, Matthew Skaruppa, Natalie Glance, Robert Meese and Stephen Chen; (ii) for 2021, Severin Hacker and Matthew Skaruppa.

(5)     The dollar amounts reported in column (e) represent the average amount of “compensation actually paid” to our NEOs as a group (excluding our PEO), as computed in accordance with Item 402(v) of Regulation S-K. The dollar amounts do not reflect the actual average amount of compensation earned by or paid to our NEOs as a group (excluding our PEO) during the applicable year. In accordance with the requirements of Item 402(v) of Regulation S-K, the following adjustments were made to average total compensation for our NEOs as a group (excluding our PEO) for each year to determine the compensation actually paid, using the same methodology described above in Note 3 above:

Year
Average Reported Summary Compensation Table for Non-PEO NEOs ($)
(Less) Reported Value of Equity Awards ($) (a)
(Plus/Minus) Equity Award Adjustments ($) (e)
(Equals) Compensation Actually Paid to Non-PEO NEOs ($)
20233,073,7202,467,40811,454,33112,060,643
20223,186,2682,628,353(64,122)493,793
202119,725,45519,234,43521,298,67421,789,694

(e) The amounts deducted or added in calculating the total average equity award adjustments are as follows:
Year
Fair Value at End of Year of Outstanding and Unvested Equity Granted in a Current Year ($)
Change in Fair Value of Outstanding and Unvested Equity Granted in Prior Year ($)
Fair Value of Equity Vesting During the Year that was Granted in Current Year ($)
Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year ($)
Total Equity Award Adjustments ($)
20233,422,8834,635,826361,6813,033,94111,454,331
20221,816,251(1,534,555)334,949(680,767)(64,122)
202120,260,750128,688234,672674,56421,298,674
(6)     Cumulative TSR is calculated by dividing (a) the sum of (i) the cumulative amount of dividends on our common stock for the measurement period (if any), assuming dividend reinvestment, and (ii) the difference between the closing trading price per share of our Class A common stock at the end and the beginning of the measurement period by (b) our the closing trading price per share of our Class A common stock at the beginning of the measurement period.
(7)     Represents the weighted peer group TSR, weighted according to the respective companies’ stock market capitalization at the beginning of each period for which a return is indicated. The peer group used for this purpose is the following published industry index: S&P 500 Information Technology Index (^SP500-45).

(8)     The dollar amounts reported represent the amount of net losses reflected in our audited financial statements for the applicable year (in thousands).

(9)     Although we use numerous financial and nonfinancial performance measures for the purpose of evaluating performance for our compensation programs, we have determined that bookings, defined as the amounts we receive from a purchase of any Duolingo subscription offering, a purchase of a Duolingo English Test, an in-app purchase for a virtual good, and from advertising networks for advertisements served to our users, is the financial performance measure that, in our assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by us to link compensation actually paid to our NEOs, for the most recently completed fiscal year, to our corporate performance.

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Relationship Between Financial Performance Measures and Compensation Actually Paid
The following graphs sets forth the relationship between Compensation Actually Paid to our PEO and the average of Compensation Actually Paid to our remaining NEOs with (i) our cumulative TSR, (ii) our net income (loss), and (iii) Bookings, in each case, over four most recently completed fiscal years. Also shown in the graph below is the relationship between our cumulative TSR to the Peer Group TSR for the same period.
Description of Relationship Between PEO and Average NEO Compensation Actually Paid and Our TSR and our Peer Group Index TSR
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, each as set forth in the table above, and our cumulative TSR and the TSR of the S&P Software and Services Select Index over the period from 2021 through 2023.
Pay Versus Performance Total Stockholder Return Chart

59    
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Description of Relationship Between PEO and Average NEO Compensation Actually Paid and Net Income
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our net income during years 2021 through 2023, each as set forth in the table above.
Pay Versus Performance Net (Loss) Income Chart

43
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Description of Relationship Between PEO and Average NEO Compensation Actually Paid and Stock Price Measure
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our Bookings during years 2021 through 2023, each as set forth in the table above.
Pay Versus Performance Bookings Chart

43
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Stock Ownership
Security Ownership of Certain Beneficial Owners and Management
The following table sets forth information relating to the beneficial ownership of our common stock as of April 15, 2024 by:
each person, or group of affiliated persons, known by us to beneficially own more than 5% of our voting securities;
each of our current directors;
each of our named executive officers for 2023; and
all directors and executive officers as a group.
The number of shares beneficially owned by each stockholder is determined under rules issued by the SEC. Under these rules, a person is deemed to be a “beneficial” owner of a security if that person has or shares voting power or investment power, which includes the power to dispose of or to direct the disposition of such security. Except as indicated in the footnotes below, we believe, based on the information furnished to us, that the individuals and entities named in the table below have sole voting and investment power with respect to all shares of common stock beneficially owned by them, subject to any applicable community property laws.
The percentage of shares beneficially owned is computed on the basis of 36,943,329 shares of our Class A common stock and 6,143,077 shares of our Class B common stock outstanding as of April 15, 2024. Shares of our common stock that a person has the right to acquire within 60 days of April 15, 2024 are deemed outstanding for purposes of computing the percentage ownership of the person holding such rights, but are not deemed outstanding for purposes of computing the percentage ownership of any other person, except with respect to the percentage ownership of all directors and executive officers as a group.
Unless otherwise indicated below, the address for each beneficial owner listed is c/o Duolingo, Inc., 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206.
DUOLINGO 2024 PROXY STATEMENT
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Class A (1)
Class B (1)
Name of Beneficial Owner
Number of 
Shares
Beneficially Owned
Percentage Beneficially OwnedNumber of
Shares
Beneficially Owned
Percentage Beneficially OwnedPercentage of Voting Power
Holders of More than 5%:
Baillie Gifford & Co (2)3,593,4269.7%—%2.2%
The Vanguard Group (3)3,320,4299.0%—%2.1%
Durable Capital Partners (4)3,195,4028.6%—%2.0%
BlackRock, Inc. (5)2,523,0756.8%—%1.6%
Named Executive Officers and Directors:
Luis von Ahn (6)
—%3,547,23153.7%38.7%
Severin Hacker (7)
72*3,558,14753.5%38.2%
Matt Skaruppa (8)
135,330*—%*
Natalie Glance (9)
185,688*—%*
Robert Meese (10)
170,189*—%*
Stephen Chen (11)
38,430*—%*
Amy Bohutinsky (12)
28,237*—%*
Sara Clemens (13)
11,664*—%*
Bing Gordon (14)
124,124*—%*
John Lilly
3,631*—%*
Gillian Munson (15)
26,619*—%*
Jim Shelton (16)
13,237*—%*
Laela Sturdy (17)
43,237*—%*
All executive officers and directors as a group (13 persons) (18)
780,4582.1%7,105,37899.9%77.0%
DUOLINGO 2024 PROXY STATEMENT
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___________________
*Represents less than 1%.
(1)Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to 20 votes and is convertible at any time into one share of Class A common stock. The figures in this table with respect to beneficial ownership of Class A common stock do not include the shares of Class B common stock beneficially owned by the specified parties.
(2)Based solely on the Schedule 13G/A filed with the SEC on January 29, 2024, Baillie Gifford & Co. has sole voting power over 3,281,266 shares of our Class A common stock, and sole dispositive power over 3,593,426 shares of our Class A common stock. The address of the foregoing named reporting person is Carlton Square, 1 Greenside Row, Edinburgh EH1 3AN, Scotland, UK.

(3)Based solely on the Schedule 13G/A filed with the SEC on February 13, 2024, The Vanguard Group has shared voting power over 55,532 shares of our Class A common stock, sole dispositive power over 3,231,226 shares of our Class A common stock and shared dispositive power over 89,203 shares of our Class A common stock. The address of the foregoing named beneficial owner is 100 Vanguard Blvd., Malvern, PA 19355.
(4)Based solely on the Schedule 13G/A filed with the SEC on February 12, 2024, Durable Capital Partners LP, as the investment advisor to Durable Capital Master Fund LP, has sole voting and sole dispositive power over 3,195,402 shares of our Class A common stock. Durable Capital Partners GP LLC (“Durable GP”) is the general partner of Durable Capital Partners LP, and Henry Ellenbogen is the chief investment officer of Durable Capital Partners LP and the managing member of Durable GP. The address of the foregoing named beneficial owner is 4747 Bethesda Avenue, Suite 1002, Bethesda, Maryland 20814.
(5)Based solely on the Schedule 13G/A filed with the SEC on January 26, 2024, BlackRock, Inc has sole voting power over 2,458,108 shares of our Class A common stock and sole dispositive power over 2,523,705 shares of our Class A common stock. The address of the foregoing named beneficial owner is 55 East 52nd Street, New York, NY 10055.

(6)Includes (i) 3,090,231 shares of our Class B common stock held directly by Dr. von Ahn, and (ii) 457,000 shares of our Class B common stock that may be acquired pursuant to the exercise of stock options within 60 days of April 15, 2024.
(7)Includes (i) 3,004,917 shares of our Class B common stock held directly by a family trust of which Dr. Hacker is a trustee, (ii) 43,730 shares of our Class B common stock held directly by Dr. Hacker, and (iii) 509,500 shares of our Class B common stock that may be acquired pursuant to the exercise of stock options within 60 days of April 15, 2024.
(8)Includes (i) 111,449 shares of our Class A common stock that may be acquired by Mr. Skaruppa pursuant to the exercise of stock options within 60 days of April 15, 2024, and (ii) 5,167 shares of Class A common stock issuable upon the vesting of RSUs held by Mr. Skaruppa within 60 days of April 15, 2024.
(9)Includes (i) 101,695 shares of our Class A common stock that may be acquired by Ms. Glance pursuant to the exercise of stock options within 60 days of April 15, 2024, and (ii) 5,167 shares of Class A common stock issuable upon the vesting of RSUs held by Ms. Glance within 60 days of April 15, 2024.
(10)Includes (i) 35,000 shares of our Class A common stock that may be acquired by Mr. Meese pursuant to the exercise of stock options within 60 days of April 15, 2024, and (ii) 3,370 shares of Class A common stock issuable upon the vesting of RSUs held by Mr. Meese within 60 days of April 15, 2024.

(11)Includes (i) 23,334 shares of our Class A common stock that may be acquired by Mr. Chen pursuant to the exercise of stock options within 60 days of April 15, 2024, and (ii) 2,156 shares of Class A common stock issuable upon the vesting of RSUs held by Mr. Chen within 60 days of April 15, 2024.

(12)Includes (i) 25,000 shares of our Class A common stock that may be acquired by Ms. Bohutinsky pursuant to the exercise of stock options within 60 days of April 15, 2024.

(13)Includes (i) 1,664 shares of our Class A common stock held directly by Ms. Clemens, (ii) 10,000 shares of our Class A common stock that may be acquired by Ms. Clemens pursuant to the exercise of stock options within 60 days of April 15, 2024.
(14)Includes (i) 50,000 shares of our Class A common stock that may be acquired by Mr. Gordon pursuant to the exercise of stock options within 60 days of April 15, 2024.

(15)Includes (i) 25,000 shares of our Class A common stock that may be acquired by Ms. Munson pursuant to the exercise of stock options within 60 days of April 15, 2024.
(16)Includes (i) 10,000 shares of our Class A common stock that may be acquired by Mr. Shelton pursuant to the exercise of stock options within 60 days of April 15, 2024.
(17)Includes (i) 40,000 shares of our Class A common stock that may be acquired by Ms. Sturdy pursuant to the exercise of stock options within 60 days of April 15, 2024.
DUOLINGO 2024 PROXY STATEMENT
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(18)Consists of: (i) 333,120 shares of Class A common stock held directly; (ii) 6,138,878 shares of Class B common stock held directly; (iii) 966,500 shares of Class B common stock that may be acquired pursuant to the exercise of stock options within 60 days of April 15, 2024; (iv) 431,478 shares of Class A common stock that may be acquired pursuant to the exercise of stock options within 60 days of April 15, 2024; and (v) 15,860 shares of Class A common stock issuable upon the vesting and settlement of RSUs within 60 days of April 15, 2024.
Delinquent Section 16(a) Reports
Section 16(a) of the Exchange Act requires our executive officers and directors, our principal accounting officer and persons who beneficially own more than 10% of our common stock to file with the SEC reports of their ownership and changes in their ownership of our common stock. To our knowledge, based solely on review of the copies of such reports and amendments to such reports with respect to the year ended December 31, 2023 filed with the SEC and on written representations by our directors and executive officers, all required Section 16 reports under the Exchange Act for our directors, executive officers, principal accounting officer and beneficial owners of greater than 10% of our common stock were filed on a timely basis during the year ended December 31, 2023 other than two Form 4s filed by Severin Hacker, each reporting one transaction, and one Form 4 filed by Matthew Skaruppa, reporting one transaction, which were inadvertently filed late.
DUOLINGO 2024 PROXY STATEMENT
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Certain Transactions with Related Persons
Policies and Procedures on Transactions with Related Persons
Our Board of Directors recognizes that transactions with related persons present a heightened risk of conflicts of interests and/or improper valuation (or the perception thereof). Our Board has adopted a written policy on transactions with related persons, which requires that our Audit Committee approve or ratify “related person transactions” (as defined in the policy) that are required to be disclosed pursuant to Item 404(a) of Regulation S-K. Item 404(a) of Regulation S-K requires disclosure, subject to certain exceptions, of transactions in which we were or are to be a participant and the amount involved exceeds $120,000 and in which any “related person” as defined under Item 404(a) of Regulation S-K had or will have a direct or indirect material interest. It is our policy that a director not participate in the approval of a related person transaction as to which he or she is a “related person.” Each of the “related person transactions” described herein entered into following the adoption of our related person transaction policy was approved in accordance with such policy.
Indemnification Agreements
We have entered into indemnification agreements with each of our current directors and executive officers. Our amended and restated certificate of incorporation and our amended and restated bylaws provide that we will indemnify our directors and officers to the fullest extent permitted by applicable law.
DUOLINGO 2024 PROXY STATEMENT
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Stockholders Proposals and Director Nominations
Stockholders who intend to have a proposal considered for inclusion in our proxy materials for presentation at our annual meeting of stockholders to be held in 2024 (the “2024 Annual Meeting”) pursuant to Rule 14a-8 under the Exchange Act must submit the proposal to our Secretary at our offices at 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206, in writing not later than December 26, 2024.
Stockholders intending to present a proposal at our 2024 Annual Meeting, but not to include the proposal in our proxy statement, or to nominate a person for election as a director, must comply with the requirements set forth in our Bylaws. Our Bylaws require, among other things, that our Secretary receive written notice from the stockholder of record of their intent to present such proposal or nomination not earlier than the close of business on the 120th day and not later than the close of business on the 90th day prior to the first anniversary of the preceding year’s annual meeting of stockholders. Therefore, we must receive notice of such a proposal or nomination for the 2025 Annual Meeting no earlier than the close of business on February 12, 2025 and no later than the close of business on March 14, 2025. The notice must contain the information required by our Bylaws. In the event that the date of the 2024 Annual Meeting is more than 30 days before or more than 60 days after June 12, 2025, then our Secretary must receive such written notice not earlier than the close of business on the 120th day prior to the 2025 Annual Meeting and not later than the close of business of the 90th day prior to the 2025 Annual Meeting or, if later, the 10th day following the day on which public disclosure of the date of such meeting is first made by us. SEC rules permit management to vote proxies in its discretion in certain cases if the stockholder does not comply with this deadline and, in certain other cases notwithstanding the stockholder’s compliance with this deadline.
In addition to satisfying the foregoing requirements under our bylaws, stockholders who intend to solicit proxies in support of director nominees other than our nominees for the 2024 annual meeting of stockholders must provide notice that sets forth the information required by rule 14a-19 under the Exchange Act.
We reserve the right to reject, rule out of order or take other appropriate action with respect to any proposal that does not comply with these or other applicable requirements.
In connection with our solicitation of proxies for our 2024 annual meeting of stockholders, we intend to file a Proxy Statement and WHITE proxy card with the SEC. Stockholders may obtain our proxy statement (and any amendments and supplements thereto) and other documents as and when filed with the SEC without charge from the SEC’s website at www.sec.gov.
DUOLINGO 2024 PROXY STATEMENT
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Householding
SEC rules permit companies and intermediaries such as brokers to satisfy delivery requirements for proxy statements and notices with respect to two or more stockholders sharing the same address by delivering a single proxy statement or a single notice addressed to those stockholders. This process, which is commonly referred to as “householding,” provides cost savings for companies and helps the environment by conserving natural resources. Some brokers household proxy materials, delivering a single proxy statement or notice to multiple stockholders sharing an address unless contrary instructions have been received from the affected stockholders. Once you have received notice from your broker that they will be householding materials to your address, householding will continue until you are notified otherwise or until you revoke your consent. If, at any time, you no longer wish to participate in householding and would prefer to receive a separate proxy statement or notice, or if your household is receiving multiple copies of these documents and you wish to request that future deliveries be limited to a single copy, please notify your broker. You can also request prompt delivery of a copy of this Proxy Statement and the Annual Report by contacting the Broadridge Financial Solutions, Inc. at (866) 540-7095 or in writing at Broadridge, Householding Department, 51 Mercedes Way, Edgewood, New York 11717.
DUOLINGO 2024 PROXY STATEMENT
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2023 Annual Report
Our 2023 Annual Report, including our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, is being mailed with this Proxy Statement to those stockholders that receive this Proxy Statement in the mail. Stockholders that receive the Notice and Access Card can access our 2023 Annual Report, including our Annual Report, at www.proxyvote.com.
Our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 has also been filed with the SEC. It is available free of charge at the SEC’s website at www.sec.gov. Upon written request by a stockholder, we will mail without charge a copy of our Annual Report on Form 10-K, including the financial statements and financial statement schedules, but excluding exhibits. Exhibits to the Annual Report on Form 10-K are available upon payment of a reasonable fee, which is limited to our expenses in furnishing the requested exhibit. All requests should be directed to the Corporate Secretary, Duolingo, Inc., 5900 Penn Avenue, Pittsburgh, Pennsylvania 15206.
DUOLINGO 2024 PROXY STATEMENT
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Your vote is important. Please promptly vote your shares by following the instructions for voting on the Notice and Access Card or, if you received a paper or electronic copy of our proxy materials, by completing, signing, dating and returning your proxy card or by Internet or telephone voting as described on your proxy card.
By Order of the Board of Directors
https://cdn.kscope.io/0bb8e36fb142433444fcb1d9ad92a451-img-signature-01.jpg
Luis von Ahn
Chief Executive Officer
Pittsburgh, Pennsylvania
April 15, 2024

DUOLINGO 2024 PROXY STATEMENT
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Appendix A
Reconciliation of Non-GAAP Financial Measure
This Proxy Statement refers to “Adjusted EBITDA” which is not defined by generally accepted accounting principles (“GAAP”) and is considered a non-GAAP financial measure. We use certain non-GAAP financial measures to supplement our consolidated financial statements, which are presented in accordance with GAAP. We use these non-GAAP financial measures, including Adjusted EBITDA, for financial and operational decision-making and as a means to evaluate period-to-period comparisons. By excluding certain items that may not be indicative of our recurring core operating results, we believe that these non-GAAP financial measures provide meaningful supplemental information regarding our performance. Accordingly, we believe these non-GAAP financial measures are useful to investors and others because they allow for additional information with respect to financial measures used by management in its financial and operational decision-making and they may be used by our institutional investors and the analyst community to help them analyze the health of our business. However, there are a number of limitations related to the use of non-GAAP financial measures, and these non-GAAP financial measures should be considered in addition to, not as a substitute for or in isolation from, our financial results prepared in accordance with GAAP. Other companies, including companies in our industry, may calculate these non-GAAP financial measures differently or not at all, which reduces their usefulness as comparative measures.
Adjusted EBITDA. Adjusted EBITDA is defined as net income (loss) excluding interest income, income taxes, depreciation and amortization, stock-based compensation expenses related to equity awards, IPO and public company costs, transaction costs related to an acquisition, acquisition earn-out costs, gain on sale of capitalized software and loss on disposal of leasehold improvements. Adjusted EBITDA is used by management to evaluate the financial performance of our business and we present Adjusted EBITDA because we believe it is helpful in highlighting trends in our operating results and that it is frequently used by analysts, investors and other interested parties to evaluate companies in our industry. The following table presents a reconciliation of our net income (loss), the most directly comparable financial measure presented in accordance with GAAP, to Adjusted EBITDA.
(In thousands)2023
Net income (loss)$16,067 
Interest income(31,091)
Provision for income taxes1,710 
Depreciation and amortization7,095 
Stock-based compensation expenses related to equity awards (1)99,226 
Acquisition earn-out costs (2)338 
Gain on sale of capitalized software (3)(100)
Loss on disposal of leasehold improvements (4)433 
Adjusted EBITDA$93,678 
________________
(1)In addition to stock-based compensation expense, this includes costs incurred related to taxes paid on equity transactions

(2)Represents costs incurred related to earn-out payments on an acquisition, which is included within General and administrative within our Consolidated Statements of Operations and Comprehensive Income (Loss).

(3)Represents proceeds from a sale of capitalized software, which is included within Other (expense) income, net within our Consolidated Statements of Operations and Comprehensive Income (Loss).

(4)Represents a loss on disposal of leasehold improvements, which is included within Other (expense) income, net within our Consolidated Statements of Operations and Comprehensive Income (Loss).


DUOLINGO 2024 PROXY STATEMENT
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Proxy CardVOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com or scan the QR Barcode above
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DUOLINGO 2024 PROXY STATEMENT
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Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting:
The Notice and Proxy Statement and Annual Report are available at www.proxyvote.com.
V46904-P06715
THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
ANNUAL MEETING OF STOCKHOLDERS
June 12, 2024
The undersigned stockholder(s) hereby appoint(s) Luis von Ahn, Stephen Chen and Matthew Skaruppa, or any of them,
as proxies, each with the power to appoint his substitute, and hereby authorize(s) them to represent and to vote, as
designated on the reverse side of this ballot, all of the shares of Common Stock of DUOLINGO, INC. that the stockholder(s)
is/are entitled to vote at the Annual Meeting of Stockholders to be held at 11:30 am, Eastern Time on June 12, 2024,
at www.virtualshareholdermeeting.com/DUOL2024, and any adjournment or postponement thereof.
THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED AS DIRECTED BY THE STOCKHOLDER(S). IF NO SUCH
DIRECTIONS ARE MADE, THIS PROXY WILL BE VOTED IN ACCORDANCE WITH THE BOARD OF DIRECTORS'
RECOMMENDATIONS AS INDICATED ON THE REVERSE SIDE, AND IN THE DISCRETION OF THE PROXIES WITH RESPECT
TO SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE ANNUAL MEETING.
PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED REPLY ENVELOPE.
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CONTINUED AND TO BE SIGNED ON REVERSE SIDE
DUOLINGO 2024 PROXY STATEMENT
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