X0206 3 2020-10-29 0 0001604477 SQZ Biotechnologies Co SQZ 0001657710 BOLNO PAUL 200 ARSENAL YARDS BLVD, SUITE 210 WAT 1 0 0 0 Stock Option 7.92 2030-06-03 Common Stock 42120 D The option vests and becomes exercisable in 48 equal monthly installments beginning on June 8, 2020. Exhibit 24 - Power of Attorney. /s/ Lawrence Knopf, Attorney-in-Fact for Paul Bolno 2020-10-29