X0508 4 2023-08-09 0 0001562088 Duolingo, Inc. DUOL 0001798849 Durable Capital Partners LP 4747 BETHESDA AVENUE #1002 BETHESDA MD 20814 0 0 1 0 0 Class A Common Stock 2023-08-09 4 S 0 14146 145.02 D 4142592 I See footnote 1 Class A Common Stock 2023-08-09 4 S 0 5323 145.75 D 4137269 I See footnote 1 Class A Common Stock 2023-08-09 4 S 0 16173 145.07 D 4121096 I See footnote 1 Class A Common Stock 2023-08-09 4 S 0 6394 145.00 D 4114702 I See footnote 1 Class A Common Stock 2023-08-09 4 S 0 211 146.60 D 4114491 I See footnote 1 Class A Common Stock 2023-08-10 4 S 0 4704 145.42 D 4109787 I See footnote 1 Class A Common Stock 2023-08-10 4 S 0 400 145.49 D 4109387 I See footnote 1 The securities are held directly by Durable Capital Master Fund LP ("Durable Capital Master Fund"). Durable Capital Partners LP ("Durable Capital") acts as the investment adviser to Durable Capital Master Fund and has sole voting power and sole investment power over the securities reported on this Form 4. Durable Capital Partners GP LLC ("Durable GP") is the general partner of Durable Capital, and Henry Ellenbogen is the chief investment officer of Durable Capital and the managing member of Durable GP. Each of Durable Capital Master Fund, Durable Capital, Durable GP and Mr. Ellenbogen disclaim beneficial ownership of the reported securities, except to the extent of any pecuniary interest therein. Durable Capital Partners LP By: Julie Jack, its Authorized Person 2023-08-11