William P. Quinn - 12 Dec 2025 Form 4 Insider Report for Bolt Biotherapeutics, Inc. (BOLT)

Signature
/s/ William P. Quinn
Issuer symbol
BOLT
Transactions as of
12 Dec 2025
Net transactions value
$0
Form type
4
Filing time
16 Dec 2025, 17:11:13 UTC
Previous filing
24 Oct 2025
Next filing
04 Feb 2026

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Quinn William P. President, CEO and CFO, Director C/O BOLT BIOTHERAPEUTICS, INC., 900 CHESAPEAKE DRIVE, REDWOOD CITY /s/ William P. Quinn 16 Dec 2025 0001724190

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction BOLT Employee Stock Option (Right to Buy) Award +7,614 7,614 12 Dec 2025 Common Stock 7,614 $5.44 Direct F1, F2
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -7,614 -100% 0 12 Dec 2025 Common Stock 7,614 $56.00 Direct F1, F2
transaction BOLT Employee Stock Option (Right to Buy) Award +3,927 3,927 12 Dec 2025 Common Stock 3,927 $5.44 Direct F1, F3
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -3,927 -100% 0 12 Dec 2025 Common Stock 3,927 $86.80 Direct F1, F3
transaction BOLT Employee Stock Option (Right to Buy) Award +5,000 5,000 12 Dec 2025 Common Stock 5,000 $5.44 Direct F1, F4
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -5,000 -100% 0 12 Dec 2025 Common Stock 5,000 $400.00 Direct F1, F4
transaction BOLT Employee Stock Option (Right to Buy) Award +10,499 10,499 12 Dec 2025 Common Stock 10,499 $5.44 Direct F1, F5
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -10,499 -100% 0 12 Dec 2025 Common Stock 10,499 $61.60 Direct F1, F5
transaction BOLT Employee Stock Option (Right to Buy) Award +12,499 12,499 12 Dec 2025 Common Stock 12,499 $5.44 Direct F6, F7
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -12,499 -100% 0 12 Dec 2025 Common Stock 12,499 $31.80 Direct F6, F7
transaction BOLT Employee Stock Option (Right to Buy) Award +11,749 11,749 12 Dec 2025 Common Stock 11,749 $5.44 Direct F8, F9
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -11,749 -100% 0 12 Dec 2025 Common Stock 11,749 $25.40 Direct F8, F9
transaction BOLT Employee Stock Option (Right to Buy) Award +21,999 21,999 12 Dec 2025 Common Stock 21,999 $5.44 Direct F10, F11
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -21,999 -100% 0 12 Dec 2025 Common Stock 21,999 $14.60 Direct F10, F11
transaction BOLT Employee Stock Option (Right to Buy) Award +34,999 34,999 12 Dec 2025 Common Stock 34,999 $5.44 Direct F12, F13
transaction BOLT Employee Stock Option (Right to Buy) Disposed to Issuer -34,999 -100% 0 12 Dec 2025 Common Stock 34,999 $7.02 Direct F12, F13
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The option is fully vested and exercisable.
F2 The reporting person agreed to cancellation of an option granted on July 29, 2020, in exchange for a new option having a lower price.
F3 The reporting person agreed to cancellation of an option granted on September 3, 2020, in exchange for a new option having a lower exercise price.
F4 The reporting person agreed to cancellation of an option granted on February 4, 2021, in exchange for a new option having a lower exercise price.
F5 The reporting person agreed to cancellation of an option granted on February 18, 2022, in exchange for a new option having a lower exercise price.
F6 For so long as the Reporting Person continuously provides services to the Issuer this option will vest with respect to the shares as follows: 1/36th of the Shares will vest upon the Reporting Person completing each month of continuous service following January 1, 2023.
F7 The reporting person agreed to cancellation of an option granted on February 27, 2023, in exchange for a new option having a lower exercise price.
F8 For so long as the Reporting Person continuously provides services to the Issuer this option will vest with respect to the shares as follows: 1/36th of the Shares will vest upon the Reporting Person completing each month of continuous service following January 1, 2024.
F9 The reporting person agreed to cancellation of an option granted on March 4, 2024, in exchange for a new option having a lower exercise price.
F10 For so long as the Reporting Person continuously provides services to the Issuer this option will vest with respect to the shares as follows: 1/36th of the Shares will vest upon the Reporting Person completing each month of continuous service following July 15, 2024.
F11 The reporting person agreed to cancellation of an option granted on July 23, 2024, in exchange for a new option having a lower exercise price.
F12 For so long as the Reporting Person continuously provides services to the Issuer this option will vest with respect to the shares as follows: 1/36th of the Shares will vest upon the Reporting Person completing each month of continuous service following January 1, 2025.
F13 The reporting person agreed to cancellation of an option granted on May 1, 2025, in exchange for a new option having a lower exercise price.