X0306 4 2022-04-29 0 0001562088 Duolingo, Inc. DUOL 0001869668 Meese Robert C/O DUOLINGO, INC 5900 PENN AVENUE PITTSBURGH PA 15206 0 1 0 0 Chief Business Officer Class A Common Stock 2022-04-29 4 M 0 15356 8.15 A 193437 D Class A Common Stock 2022-05-03 4 M 0 4375 14.42 A 197812 D Class A Common Stock 2022-05-03 4 M 0 269 8.15 A 198081 D Class A Common Stock 1800 I See footnote Class A Common Stock 1800 I See footnote Stock Options 8.15 2022-04-29 4 M 0 15356 0.00 D 2029-09-25 Class A Common Stock 15356 9644 D Stock Options 14.42 2022-05-03 4 M 0 4375 0.00 D 2030-03-10 Class A Common Stock 4375 5625 D Stock Options 8.15 2022-05-03 4 M 0 269 0.00 D 2029-09-25 Class A Common Stock 269 9375 D Shares held by Eliot Meese Qualified Minor's Trust. Shares held by Isaac Meese Qualified Minor's Trust. 1/24th of the shares subject to the option vest on each monthly anniversary measured from September 6, 2020 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the second anniversary of the Vesting Commencement Date. 1/48th of the shares subject to the option vest on each monthly anniversary measured from March 9, 2020 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date. /s/ Stephen Chen, as Attorney-in-Fact for Robert Meese 2022-05-03