Duolingo 4: 100 fully vested RSUs granted (Oct 13, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-10-10 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Duolingo, Inc. (DUOL) CIK: 0001562088 --- Reporting Owner --- Name: Shelton James H CIK: 0001342646 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-10-10 | Code: A (Grant or award) Shares: +100 | Price: $149.92 Total Value: $14,992.00 Shares Owned After: 11,853 | Ownership: D (Direct) Footnotes: [F1] Represents an award of fully vested restricted stock units ("RSUs") in lieu of cash retainers pursuant to reporting person's election under the Issuer's Amended and Restated Non-Employee Director Compensation Program (the "Plan"). Each RSU represents the right to receive one share of the Issuer's Class A Common Stock and will be settled either on a date selected by the reporting person pursuant to the Plan or as otherwise provided under the Plan. --- Footnotes (Complete Index) --- F1: Represents an award of fully vested restricted stock units ("RSUs") in lieu of cash retainers pursuant to reporting person's election under the Issuer's Amended and Restated Non-Employee Director Compensation Program (the "Plan"). Each RSU represents the right to receive one share of the Issuer's Class A Common Stock and will be settled either on a date selected by the reporting person pursuant to the Plan or as otherwise provided under the Plan. --- Signature --- /s/ /s/ Stephen Chen, as Attorney-in-Fact for James H. Shelton (2026-10-13)