Duolingo

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-10 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Duolingo, Inc. (DUOL) CIK: 0001562088 --- Reporting Owner --- Name: KRAWCHECK SALLIE CIK: 0001226642 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-08-10 | Code: A (Grant or award) Shares: +1,312 | Price: $0.00 Shares Owned After: 1,312 | Ownership: D (Direct) Footnotes: [F1] Represents 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. [Transaction #2] Security: Class A Common Stock Date: 2026-08-10 | Code: A (Grant or award) Shares: +3,280 | Price: $0.00 Shares Owned After: 4,592 | Ownership: D (Direct) Footnotes: [F2] One-half of the RSUs vest on August 10, 2027, and one-fourth vest on each of August 10, 2028 and August 10, 2029. --- Footnotes (Complete Index) --- F1: Represents 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. F2: One-half of the RSUs vest on August 10, 2027, and one-fourth vest on each of August 10, 2028 and August 10, 2029. --- Signature --- /s/ /s/ Stephen Chen, as Attorney-in-Fact for Sallie Krawcheck (2026-08-12)