X0306 4 2022-06-15 0 0001604477 SQZ Biotechnologies Co SQZ 0001657710 BOLNO PAUL 200 ARSENAL YARDS BLVD, SUITE 210 WATERTOWN MA 02472 1 0 0 0 Stock Option 3.23 2022-06-15 4 A 0 20000 0.00 A 2032-06-14 Common Stock 20000 20000 D The option vests and become exercisable on the earlier of (i) June 15, 2023 or (ii) the day immediately prior to the date of the next annual meeting of stockholders following the date of grant, in each case subject to the recipient's continued service on the Board at such time. /s/ Lawrence Knopf, Attorney-in-Fact for Paul Bolno 2022-06-16