Spero Therapeutics, Inc. (SPRO) has 8 SEC Form 4 insider filings on record in the last 90 days. Most recent filing: Aug. 6, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
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| Aug. 6, 2026 filed Aug. 3, 2026 | Zack Debra Chief Medical Officer | $0 | 486,986 | +100% | Yes | |
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| June 25, 2026 filed June 23, 2026 | Deshpande Milind Director | $0 | 30,000 | +100% | No | |
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| June 25, 2026 filed June 23, 2026 | Tregoning Kathleen Director | $0 | 30,000 | +100% | No | |
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| June 25, 2026 filed June 23, 2026 | Smith Cynthia Director | $0 | 30,000 | +100% | No | |
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| June 25, 2026 filed June 23, 2026 | VINK PATRICK V.J.J. Director | $0 | 30,000 | +100% | No | |
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Showing the 5 most recent of 8 filings in the last 90 days.
Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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