Form 4: Seres Therapeutics Director Sells Shares
Insider Transaction (Form 4)
Eric D. Shaff, a Director of Seres Therapeutics, Inc., sold 263 shares of common stock on August 15, 2026 for $4.55 per share.
Summary
- Option exercise/conversion: acquired 722 Common Stock on August 15, 2026; holds 12,762 after (Direct).
- Open-market sale: disposed of 263 Common Stock at $4.55 ($1,197) on August 17, 2026; holds 12,499 after (Direct).
- Option exercise/conversion: disposed of 390 Restricted Stock Units on August 15, 2026; holds 783 after (Direct).
- Option exercise/conversion: disposed of 332 Restricted Stock Units on August 15, 2026; holds 1,993 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $1,197 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Eric D. Shaff — Director
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-08-15 | Option exercise/conversion | Common Stock | 722 | — | — | 12,762 |
| 2026-08-17 | Open-market sale | Common Stock | 263 | $5 | $1.2K | 12,499 |
| 2026-08-15 | Option exercise/conversion | Restricted Stock Units | 390 | — | — | 783 |
| 2026-08-15 | Option exercise/conversion | Restricted Stock Units | 332 | — | — | 1,993 |
Key Dates
| Date | Description |
|---|---|
| 2026-08-15 | Option exercise/conversion (722 shares) |
| 2026-08-17 | Open-market sale (263 shares) |
| 2026-08-15 | Option exercise/conversion (390 shares) |
| 2026-08-15 | Option exercise/conversion (332 shares) |
Keywords
insider transaction, Form 4, MCRB, Seres Therapeutics, Inc., bearish, Eric D. Shaff
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