X0206 3 2020-02-05 0 0001745999 Beam Therapeutics Inc. BEAM 0001786484 Burrell Terry-Ann C/O BEAM THERAPEUTICS INC. 26 LANDSDOWNE STREET CAMBRIDGE MA 02139 0 1 0 0 CFO Stock Option (Right to Buy) 13.68 2029-08-31 Common Stock 390250 D The option vests as to 25% on the first anniversary of the of the vesting commencement date, August 20, 2019, and at a rate of 2.78% each month thereafter until the option is fully vested. Exhibit List: Exhibit 24 - Power of Attorney By: /s/ Christine Bellon, Attorney-in-Fact 2020-02-05