X0508 4 2025-12-12 0001641281 Bolt Biotherapeutics, Inc. BOLT 0001958382 Berner Laura C/O BOLT BIOTHERAPEUTICS, INC. 900 CHESAPEAKE DRIVE REDWOOD CITY CA 94063 true false false false false Director Stock Option (Right to Buy) 5.44 2025-12-12 4 A false 2500 A 2032-12-13 Common Stock 2500 2500 D Director Stock Option (Right to Buy) 27.20 2025-12-12 4 D false 2500 D 2032-12-13 Common Stock 2500 0 D Director Stock Option (Right to Buy) 5.44 2025-12-12 4 A false 613 A 2032-12-13 Common Stock 613 613 D Director Stock Option (Right to Buy) 27.20 2025-12-12 4 D false 613 D 2032-12-13 Common Stock 613 0 D Director Stock Option (Right to Buy) 5.44 2025-12-12 4 A false 1250 A 2033-06-11 Common Stock 1250 1250 D Director Stock Option (Right to Buy) 32.60 2025-12-12 4 D false 1250 D 2033-06-11 Common Stock 1250 0 D Director Stock Option (Right to Buy) 5.44 2025-12-12 4 A false 1100 A 2034-06-11 Common Stock 1100 1100 D Director Stock Option (Right to Buy) 15.364 2025-12-12 4 D false 1100 D 2034-06-11 Common Stock 1100 0 D Director Stock Option (Right to Buy) 5.44 2025-12-12 4 A false 1100 A 2035-05-26 Common Stock 1100 1100 D Director Stock Option (Right to Buy) 6.40 2025-12-12 4 D false 1100 D 2035-05-26 Common Stock 1100 0 D The shares subject to this option shall vest in equal monthly installments, at a rate of 1/36th of the total number of shares on each monthly anniversary of December 14, 2022 (the "Vesting Commencement Date") for so long as the Reporting Person provides continuous service to the Issuer, such that the total number of shares shall be fully vested on the three-year anniversary of the Vesting Commencement Date; provided, however that the option will vest in full upon a change in control of the Issuer. The reporting person agreed to cancellation of an option granted on December 14, 2022, in exchange for a new option having a lower exercise price. The option is fully vested and exercisable. The reporting person agreed to cancellation of an option granted on June 12, 2023, in exchange for a new option having a lower exercise price. The reporting person agreed to cancellation of an option granted on June 12, 2024, in exchange for a new option having a lower exercise price. The shares subject to the option will vest on the earlier of May 27, 2026 or the day immediately prior to the next annual meeting of stockholders, subject to the Reporting Person's continuous service through such date; provided, however that the option will vest in full upon a change in control of the Issuer. The reporting person agreed to cancellation of an option granted on May 27, 2025, in exchange for a new option having a lower exercise price. /s/ William P. Quinn, Attorney-in-Fact 2025-12-16