SEC Filing Form 4: Merendino Lauren Transactions

On April 23, 2026, Lauren Merendino, Chief Commercial Officer of Day One Biopharmaceuticals, Inc., reported several transactions. These include the disposal of 60,157 shares of Common Stock. Additionally, various stock options and restricted stock units (RSUs) were disposed of. Specifically, 330,200 Stock Options with an exercise price of $8.99 and an expiration date of June 11, 2033, were disposed of. Further disposals of Stock Options included 90,000 expiring January 4, 2034, 90,000 expiring January 14, 2035, and 110,000 expiring January 29, 2036, all with an exercise price of $8.99 or $11.16 respectively. RSUs disposed of included 18,978, 25,816, 40,565, and 69,375 units. All these transactions occurred in connection with the merger between Day One Biopharmaceuticals, Inc. and Servier Pharmaceuticals LLC, as detailed in footnotes F1 and F2. Footnote F4 indicates that immediately prior to the merger, all unvested options and RSUs became fully vested and were subsequently canceled and converted into the right to receive the merger consideration in cash.