X0407 4 2023-01-31 0 0001745999 Beam Therapeutics Inc. BEAM 0001786484 Burrell Terry-Ann C/O BEAM THERAPEUTICS INC., 238 MAIN STREET CAMBRIDGE MA 02142 0 1 0 0 Chief Financial Officer 0 Common Stock 2023-03-31 4 A 0 20000 0.00 A 51277 D Stock Option (Right to Buy) 43.45 2023-01-31 4 A 0 20000 0.00 A 2033-01-31 Common Stock 20000 20000 D Represents restricted stock units ("RSUs") granted to the Reporting Person under the Beam Therapeutics Inc. ("BEAM") 2019 Equity Incentive Plan. Each RSU represents the contingent right to receive one share of BEAM's common stock. The RSUs vest in four substantially equal annual installments on each of the first four anniversaries of the date of grant, subject to the Reporting Person's continued service with BEAM through each vesting date. This stock option vests in equal monthly installments each month following the date of grant for the subsequent 48 months, subject to the Reporting Person's continued service with BEAM through each vesting date. By: /s/ Christine Bellon, Attorney-in-fact 2023-03-31