X0609 4 2026-10-01 0001745999 Beam Therapeutics Inc. BEAM 0002033155 Cavanagh Bethany J false C/O BEAM THERAPEUTICS INC., 238 MAIN STREET CAMBRIDGE MA 02142 false true false false SVP, Finance and Treasurer true Common Stock 2026-10-01 4 S false 187 24.41 D 50984 D These shares of common stock were automatically sold in a non-discretionary transaction by the Reporting Person in order to cover tax withholding obligations upon the vesting of certain restricted stock units granted to the Reporting Person under the Beam Therapeutics Inc. 2019 Equity Incentive Plan on September 30, 2024. The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 9, 2024. By: /s/ Christine Bellon, Attorney-in-fact 2026-10-02