Shaff Eric D. — SEC Form 4 filings
SEC reporting owner CIK 1643734. 14 Form 4 filings on record with FilingPulse; latest filed 2026-08-18.
Transaction summary — filings shown
Covers all 14 filings on record, filed 2024-02-16 to 2026-08-18. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 12 legs across 12 filings — 41,916 shares, $48,893 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 40.
- Largest priced transaction: sale of 11,549 shares @ $1.08 ($12,473) in Seres Therapeutics, Inc., filed 2024-02-16.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Seres Therapeutics, Inc. (MCRB) | Director | 14 | — | 12 legs · 41,916 sh · $48,893 | 40 |
Form 4 filings — Shaff Eric D.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-18 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 722 · Sale (S): 263 @ $4.55 · Option exercise (M): 390 (derivative) @ $0 · Option exercise (M): 332 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Seres Therapeutics, Inc. (MCRB) | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-05-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 722 · Sale (S): 259 @ $7.53 · Option exercise (M): 391 (derivative) @ $0 · Option exercise (M): 331 (derivative) @ $0 | EDGAR |
| 2026-02-18 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 723 · Sale (S): 259 @ $8.47 · Option exercise (M): 391 (derivative) @ $0 · Option exercise (M): 333 (derivative) @ $0 | EDGAR |
| 2025-11-18 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 390 · Option exercise (M): 331 · Sale (S): 217 @ $17.30 · Option exercise (M): 390 (derivative) @ $0 · Option exercise (M): 331 (derivative) @ $0 | EDGAR |
| 2025-08-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 391 · Option exercise (M): 333 · Sale (S): 217 @ $16.65 · Option exercise (M): 391 (derivative) @ $0 · Option exercise (M): 333 (derivative) @ $0 | EDGAR |
| 2025-05-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 390 · Option exercise (M): 331 · Sale (S): 220 @ $7.28 · Option exercise (M): 390 (derivative) @ $0 · Option exercise (M): 331 (derivative) @ $0 | EDGAR |
| 2025-02-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 7,813 · Option exercise (M): 26,563 · Sale (S): 12,726 @ $0.81 · Option exercise (M): 7,813 (derivative) @ $0 · Option exercise (M): 26,563 (derivative) @ $0 | EDGAR |
| 2025-02-11 | 4 | Seres Therapeutics, Inc. (MCRB) | Grant/award (A): 1,950,000 (derivative) @ $0 | EDGAR |
| 2024-11-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 7,812 · Sale (S): 2,505 @ $0.54 · Option exercise (M): 7,812 (derivative) @ $0 | EDGAR |
| 2024-10-29 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 27,837 @ $0 · Sale (S): 8,748 @ $0.69 · Option exercise (M): 27,837 (derivative) @ $0 | EDGAR |
| 2024-08-19 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 7,813 · Sale (S): 2,518 @ $0.84 · Option exercise (M): 7,813 (derivative) @ $0 | EDGAR |
| 2024-05-17 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 7,812 · Sale (S): 2,435 @ $0.94 · Option exercise (M): 7,812 (derivative) @ $0 | EDGAR |
| 2024-02-16 | 4 | Seres Therapeutics, Inc. (MCRB) | Option exercise (M): 31,250 · Sale (S): 11,549 @ $1.08 · Grant/award (A): 637,500 (derivative) @ $0 · Grant/award (A): 822,580 (derivative) @ $0 · Grant/award (A): 106,250 (derivative) @ $0 · Option exercise (M): 31,250 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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