🕵️ Spero Therapeutics, Inc. ($SPRO)
SEC insider & ownership activity, last 12 months · CIK 1701108 · every row links its SEC filing
Over the last 12 months insiders sold $568K with no open-market buying against it. Rajavelu Esther sold $407K (Nov–May). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 3 sellers, $568K (11 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Rajavelu Esther | 0 | – | 5 | $407K | May 4, 2026 |
| Keutzer Timothy | 0 | – | 5 | $149K | Feb 6, 2026 |
| Mahadevia Ankit | 0 | – | 1 | $13K | Aug 28, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| GSK PLC | 16.4% | 13D | Mar 27, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Jul 8, 2026 | filing ↗ |
| New financial obligation (2.03) | Jul 8, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 8, 2026 | filing ↗ |
| Other events (8.01) | Jul 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 8, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 23, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Jun 23, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 17, 2026 | filing ↗ |
| Other events (8.01) | Jun 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 17, 2026 | filing ↗ |
| Earnings (2.02) | May 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 13, 2026 | filing ↗ |
| Earnings (2.02) | Mar 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 26, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 30, 2026 | filing ↗ |
| Other events (8.01) | Jan 30, 2026 | filing ↗ |
| Other events (8.01) | Dec 19, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 19, 2025 | filing ↗ |
| Earnings (2.02) | Nov 13, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 13, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 13, 2025 | filing ↗ |
| Earnings (2.02) | Aug 12, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2025 | filing ↗ |