## SEC Form 4

## FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION

**STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP**  
OMB Number: 3235-0287  
Section 16. Form 4 or Form 5 Estimated average burden hours per response: 0.5 Instruction 1(b). Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940.

### Reporting Person Details  
1. **Name and Address of Reporting Person***  
   - **Name:** GORDON WILLIAM B  
   - **Relationship to Issuer:** Director, 10% Owner, Officer  
   - **Address:** C/O DUOLINGO, INC., 5900 PENN AVENUE, PITTSBURGH PA 15206
   
2. **Issuer Name and Ticker or Trading Symbol**  
   - **Issuer Name:** Duolingo, Inc.  
   - **Ticker:** DUOL
   
3. **Date of Earliest Transaction**  
   - **Date:** 06/03/2026

4. **If Amendment, Date of Original Filed**  
   
5. **Individual or Joint/Group Filing**  
   - Form filed by One Reporting Person  
   - Form filed by More than One Reporting Person

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### Table I-Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

| **1. Title of Security** | **2. Transaction Date** | **2A. Deemed Execution Date** | **3. Securities Acquired (A) or Disposed Of (D)** | **4. Amount of Securities** | **5. Ownership Form: Direct (D) or Indirect (I)** | **6. Nature of Indirect Beneficial Ownership** |
|--------------------------|------------------------|-------------------------------|------------------------------------------------|-------------------------------|--------------------------------------------------|-----------------------------------------------|
| Class A Common Stock     | 06/03/2026             | A                             | 2,001(1) A                                   | $0                            | D                                                 |                                               |
|                          |                        |                               |                                                | 78,415                        |                                                  |                                               |

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### Table II-Derivative Securities Acquired, Disposed of, or Beneficially Owned

| **1. Title of Derivative Security** | **2. Date Exercisable** | **3. Transaction Date** | **3A. Deemed Execution Date** | **4. Amount** | **5. Number of Derivative Securities** | **6. Date of Expiration** | **7. Title and Amount of Underlying Securities** | **8. Price of Derivative Security** | **9. Number of Shares** | **10. Nature of Indirect Ownership** |
|--------------------------------------|------------------------|------------------------|-------------------------------|---------------|--------------------------------------|--------------------------|-------------------------------------------------|-------------------------------------|----------------------|--------------------------------------|
|                                      |                        |                        |                               |               |                                      |                          |                                                 |                                     |                      |                                      |

**Explanation of Responses:**  
1. Constitute restricted stock units ("RSUs") for which the Reporting Person is entitled to receive one (1) share of the Issuer's Class A Common Stock for each RSU upon vesting. 100% of the RSUs vest on the earlier of (i) the first anniversary of the grant date or (ii) the date of the next annual meeting of the Issuer's stockholders following the grant date, subject to the Reporting Person's continued service to the Issuer.

**Remarks:**  
/s/ Stephen Chen, as Attorney-in-Fact for William B. Gordon  
Date: 06/05/2026

**Reminder:** Report on a separate line for each class of securities beneficially owned directly or indirectly.  
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).  
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).**  
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.