Transaction Details

Footnotes

These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 16, 2025. | Includes 418 shares acquired by the Reporting Person under the Beam Therapeutics Inc. ("BEAM") Amended and Restated 2019 Employee Stock Purchase Plan on September 30, 2025. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $24.14 to $24.92, inclusive. The Reporting Person undertakes to provide to BEAM, any security holder of BEAM or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $24.22 to $25.05, inclusive. The Reporting Person undertakes to provide to BEAM, any security holder of BEAM or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. | On May 8, 2018, the Reporting Person was granted an option to purchase shares of common stock, which vested as to 99,396 shares upon the achievement of a closing hurdle following BEAM's initial public offering (which closing price hurdle was achieved) (the "Price Condition"). The portion of the award subject to the Price Condition vested in three equal installments on December 21, June 30, 2022, and December 31, 2022.