Spero Therapeutics, Inc (SPRO) insider trading
Every open-market stock purchase and sale by Spero Therapeutics, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Insiders sold $552K over the last 12 months (6 sales). No open-market buys.
- Last insider buy: Aquilo Capital Management LLC (10% owner), $208K, 4 years ago.
Last 12 months: insiders bought $0 (0 buys) and sold $552K (6 sales). Last close $1.26 on Aug 7, 2026.
Recent SPRO insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Aug 3, 2026 | Debra Zack (C-suite exec) | Bought (not open market) | — |
| Aug 3, 2026 | Debra Zack (C-suite exec) | Bought (not open market) | — |
| Jun 23, 2026 | Cynthia Smith (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Cynthia Smith (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Milind Deshpande (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Milind Deshpande (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Scott Thomas Jackson (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Scott Thomas Jackson (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | John C Pottage Jr (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Kathleen Tregoning (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Kathleen Tregoning (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Patrick V.j.j. Vink (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Patrick V.j.j. Vink (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Frank E Thomas (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | Frank E Thomas (Insider) | Bought (not open market) | — |
| Jun 23, 2026 | John C Pottage Jr (Insider) | Bought (not open market) | — |
| May 4, 2026 | Esther Rajavelu (Insider) | Sold | $63.4K |
| Feb 6, 2026 | Esther Rajavelu (Insider) | Sold | $120K |
| Feb 6, 2026 | Esther Rajavelu (Insider) | Sold | $87.6K |
| Feb 6, 2026 | Timothy Keutzer (COO) | Sold | $44K |
| Feb 4, 2026 | Timothy Keutzer (COO) | Sold | $7.8K |
| Feb 3, 2026 | Timothy Keutzer (COO) | Sold | $51.8K |
| Feb 2, 2026 | Timothy Keutzer (COO) | Sold | $41.6K |
| Feb 2, 2026 | Esther Rajavelu (Insider) | Sold | $40.6K |
| Feb 2, 2026 | Esther Rajavelu (Insider) | Bought (not open market) | — |
Who's trading SPRO
- Debra Zack, C-suite exec: other filings, last Aug 3, 2026
- Milind Deshpande, Insider: other filings, last Jun 23, 2026
- Scott Thomas Jackson, Insider: other filings, last Jun 23, 2026
- John C Pottage Jr, Insider: other filings, last Jun 23, 2026
- Cynthia Smith, Insider: other filings, last Jun 23, 2026
- Frank E Thomas, Insider: other filings, last Jun 23, 2026
- Kathleen Tregoning, Insider: other filings, last Jun 23, 2026
- Patrick V.j.j. Vink, Insider: other filings, last Jun 23, 2026
- Esther Rajavelu, Insider: sold $407K (5 sales), last May 4, 2026
- Timothy Keutzer, COO: sold $145K (4 sales), last Feb 6, 2026
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