Brian O'Callaghan
CIK: 0001415015
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Bolt Biotherapeutics, Inc.
Discretionary Trading P&L
Holdings
Transaction History (14 total)
- Jun 10, 2026BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectStock Option (Right to Buy)
5K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.4K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.4K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.8K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.8K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.3K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.3K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.3K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.3K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.1K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.1K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectDirector Stock Option (Right to Buy)
1.1K shares- - Dec 12, 2025BOLT
Bolt Biotherapeutics, Inc.
Disposition(D)DirectDirector Stock Option (Right to Buy)
1.1K shares- - May 27, 2025BOLT
Bolt Biotherapeutics, Inc.
Award(A)DirectStock Option (Right to Buy)
1.1K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jun 10, 2026 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Stock Option (Right to Buy) | 5,000 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,393 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,393 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,810 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,810 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,250 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,250 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,250 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,250 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,100 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,100 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Director Stock Option (Right to Buy) | 1,100 | - | - | Direct |
| Dec 12, 2025 | BOLT Bolt Biotherapeutics, Inc. | Disposition(D) Director Stock Option (Right to Buy) | 1,100 | - | - | Direct |
| May 27, 2025 | BOLT Bolt Biotherapeutics, Inc. | Award(A) Stock Option (Right to Buy) | 1,100 | - | - | Direct |
1-14 of 14 transactions
About O'CALLAGHAN BRIAN
O'CALLAGHAN BRIAN (SEC CIK 0001415015) files insider reports with the SEC as Director of Bolt Biotherapeutics, Inc. (BOLT).
Signal8 holds 3 ownership filings by O'CALLAGHAN BRIAN, all Form 4s, filed between Jul 2, 2025 and Jun 11, 2026. Those filings report 14 transactions, from May 27, 2025 to Jun 10, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on O'CALLAGHAN BRIAN's filings is in REDWOOD CITY, CA.
Recent filings by O'CALLAGHAN BRIAN
- Jun 10, 2026: Grant or award of BOLT derivative securities (Form 4, code A).
- Dec 12, 2025: Grant or award of BOLT derivative securities (Form 4, code A).
- Dec 12, 2025: Disposition to issuer transaction of BOLT derivative securities (Form 4, code D).
- Dec 12, 2025: Grant or award of BOLT derivative securities (Form 4, code A).
- Dec 12, 2025: Disposition to issuer transaction of BOLT derivative securities (Form 4, code D).
Other insiders filing for Bolt Biotherapeutics, Inc. (BOLT)
- GUJRATHI SHEILA, Chief Strategy Officer
- Yonehiro Grant, Chief Operating Officer
- Nemec Sarah, Senior VP, Finance and PAO
- Quinn William P., President, CEO and CFO
- Berner Laura, Director
- LAPORTE KATHLEEN, Director