Spero Therapeutics, Inc. (SPRO)
Spero Therapeutics, Inc. (SPRO) Insider Trading
Directors, officers and holders of more than 10% of SPRO report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 55 transactions on file: 0 with code P, 20 with code S and 30 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 3, 2026 | Zack Debra | Chief Medical Officer | A Award | 162,311 | Not measured | Not measured |
| Aug 3, 2026 | Zack Debra | Chief Medical Officer | A Award | 324,675 | Not measured | Not measured |
| Jun 23, 2026 | Jackson Scott Thomas | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | Pottage John C Jr | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | Jackson Scott Thomas | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | Deshpande Milind | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | Tregoning Kathleen | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | Smith Cynthia | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | VINK PATRICK V.J.J. | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | THOMAS FRANK E | Director | A Award | 10,000 | Not measured | Not measured |
| Jun 23, 2026 | THOMAS FRANK E | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | VINK PATRICK V.J.J. | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | Smith Cynthia | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | Tregoning Kathleen | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | Deshpande Milind | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 23, 2026 | Pottage John C Jr | Director | A Award | 20,000 | Not measured | Not measured |
| May 4, 2026 | Rajavelu Esther | See Remarks | S Sale | 25,240 | $2.51 | $63,352 |
| Feb 6, 2026 | Rajavelu Esther | See Remarks | S Sale | 37,101 | $2.36 | $87,558 |
| Feb 6, 2026 | Rajavelu Esther | See Remarks | S Sale | 50,816 | $2.36 | $119,926 |
| Feb 6, 2026 | Keutzer Timothy | Chief Operating Officer | S Sale | 18,652 | $2.36 | $44,019 |
| Feb 4, 2026 | Keutzer Timothy | Chief Operating Officer | S Sale | 3,471 | $2.24 | $7,775 |
| Feb 3, 2026 | Keutzer Timothy | Chief Operating Officer | S Sale | 24,224 | $2.14 | $51,839 |
| Feb 2, 2026 | Keutzer Timothy | Chief Operating Officer | S Sale | 18,891 | $2.20 | $41,560 |
| Feb 2, 2026 | Keutzer Timothy | Chief Operating Officer | A Award | 137,000 | Not measured | Not measured |
| Feb 2, 2026 | Rajavelu Esther | See Remarks | A Award | 498,000 | Not measured | Not measured |
| Feb 2, 2026 | Rajavelu Esther | See Remarks | A Award | 249,000 | Not measured | Not measured |
| Feb 2, 2026 | Rajavelu Esther | See Remarks | S Sale | 18,442 | $2.20 | $40,572 |
| Feb 2, 2026 | Keutzer Timothy | Chief Operating Officer | A Award | 68,000 | Not measured | Not measured |
| Nov 7, 2025 | Rajavelu Esther | See Remarks | S Sale | 40,270 | $2.37 | $95,440 |
| Aug 28, 2025 | Keutzer Timothy | Chief Operating Officer | S Sale | 1,695 | $1.97 | $3,339 |
| Aug 28, 2025 | Mahadevia Ankit | Director | S Sale | 6,572 | $1.97 | $12,947 |
| Jun 12, 2025 | Smith Cynthia | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | THOMAS FRANK E | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | Tregoning Kathleen | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | VINK PATRICK V.J.J. | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | Pottage John C Jr | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | Deshpande Milind | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | Mahadevia Ankit | Director | A Award | 20,000 | Not measured | Not measured |
| Jun 12, 2025 | Jackson Scott Thomas | Director | A Award | 20,000 | Not measured | Not measured |
| May 2, 2025 | Rajavelu Esther | See Remarks | A Award | 185,000 | Not measured | Not measured |
| Feb 5, 2025 | Shukla Sath | CEO & President | S Sale | 106,408 | $0.7800 | $82,998 |
| Feb 5, 2025 | Shukla Sath | CEO & President | S Sale | 6,139 | $0.7800 | $4,788 |
| Feb 5, 2025 | Mahadevia Ankit | Director | S Sale | 13,959 | $0.7800 | $10,888 |
| Feb 5, 2025 | Keutzer Timothy | Chief Operating Officer | S Sale | 24,920 | $0.7800 | $19,438 |
| Feb 5, 2025 | Keutzer Timothy | Chief Operating Officer | S Sale | 27,643 | $0.7800 | $21,562 |
| Feb 5, 2025 | Keutzer Timothy | Chief Operating Officer | S Sale | 3,974 | $0.7800 | $3,100 |
| Feb 5, 2025 | Rajavelu Esther | See Remarks | S Sale | 20,689 | $0.7800 | $16,137 |
| Feb 5, 2025 | Shukla Sath | CEO & President | S Sale | 42,786 | $0.7800 | $33,373 |
| Feb 5, 2025 | Mahadevia Ankit | Director | S Sale | 55,260 | $0.7800 | $43,103 |
| Feb 3, 2025 | Keutzer Timothy | Chief Operating Officer | A Award | 266,139 | Not measured | Not measured |
The full Form 4 history is on the SPRO company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.