X0609 4 2026-08-06 0001839970 BlossomHill Therapeutics, Inc. BLSM 0001282930 GORDON CARL L false C/O BLOSSOMHILL THERAPEUTICS, INC. 10255 SCIENCE CENTER DRIVE, SUITE 200 SAN DIEGO CA 92121 true false false false 0 Director Stock Option (Right to Buy) 16 2026-08-06 4 A 0 23904 0 A 2036-08-05 Common Stock 23904 23904 D 1/36th of the shares subject to the option shall vest in equal monthly installments over a three year period following August 6, 2026. Pursuant to an agreement with OrbiMed Advisors LLC, the Reporting Person is obligated to transfer any securities issued under any such stock options or other awards, or the economic benefit thereof to OrbiMed Advisors LLC, which will in turn ensure that such securities or economic benefits are provided to OrbiMed Private Investments VIII, LP. /s/ Vincent Liptak, Attorney-in-Fact 2026-08-10