Spero Therapeutics Inc (SPRO)
Insider transactions
A complete record of Form 4 filings tracking every share acquisition and disposal by executives, directors, and senior officers. Filterable by date range and transaction type, the table exposes the direct market actions of those with the deepest knowledge of a company's operations — providing a factual, data-driven signal of internal conviction that complements traditional fundamental and technical analysis.
Transaction date | Executive | Executive Title | Security Type | Acquisition / Disposal | Shares | Share price |
|---|---|---|---|---|---|---|
| Aug 3, 2026 | ZACK, DEBRA | Chief Medical Officer | Stock option (right to buy) | Acquisition | 324,675 | $0 |
| Aug 3, 2026 | ZACK, DEBRA | Chief Medical Officer | Common Stock | Acquisition | 162,311 | $0 |
| Jun 23, 2026 | TREGONING, KATHLEEN | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | JACKSON, SCOTT THOMAS | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | THOMAS, FRANK E | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | TREGONING, KATHLEEN | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | POTTAGE, JOHN C JR | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | DESHPANDE, MILIND | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | POTTAGE, JOHN C JR | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | JACKSON, SCOTT THOMAS | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | DESHPANDE, MILIND | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | THOMAS, FRANK E | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | VINK, PATRICK V.J.J. | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| Jun 23, 2026 | VINK, PATRICK V.J.J. | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | SMITH, CYNTHIA | Director | Common Stock | Acquisition | 10,000 | $0 |
| Jun 23, 2026 | SMITH, CYNTHIA | Director | Stock Option (right to buy) | Acquisition | 20,000 | $0 |
| May 4, 2026 | RAJAVELU, ESTHER | See Remarks | Common Stock | Disposal | 25,240 | $2.51 |
| Feb 6, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Common Stock | Disposal | 18,652 | $2.36 |
| Feb 6, 2026 | RAJAVELU, ESTHER | See Remarks | Common Stock | Disposal | 50,816 | $2.36 |
| Feb 6, 2026 | RAJAVELU, ESTHER | See Remarks | Common Stock | Disposal | 37,101 | $2.36 |
| Feb 4, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Common Stock | Disposal | 3,471 | $2.24 |
| Feb 3, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Common Stock | Disposal | 24,224 | $2.14 |
| Feb 2, 2026 | RAJAVELU, ESTHER | See Remarks | Common Stock | Disposal | 18,442 | $2.20 |
| Feb 2, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Common Stock | Acquisition | 68,000 | $0 |
| Feb 2, 2026 | RAJAVELU, ESTHER | See Remarks | Stock Option (Right to Buy) | Acquisition | 498,000 | $0 |
| Feb 2, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Stock Option (Right to Buy) | Acquisition | 137,000 | $0 |
| Feb 2, 2026 | KEUTZER, TIMOTHY | Chief Operating Officer | Common Stock | Disposal | 18,891 | $2.20 |
| Feb 2, 2026 | RAJAVELU, ESTHER | See Remarks | Common Stock | Acquisition | 249,000 | $0 |