MCRB insider transaction filings
Seres Therapeutics, Inc. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-08-18. Screen MCRB transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 19 Form 4 filings. 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): 4 legs across 4 filings by 4 insiders — 490 shares, $2,230 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 27.
- Largest priced transaction: sale of 263 shares @ $4.55 ($1,197) by Shaff Eric D., filed 2026-08-18.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| Shaff Eric D. — Director | 2 | — | 1 leg · 263 sh · $1,197 | 4 |
| DesRosier Thomas — See Remarks | 2 | — | 1 leg · 82 sh · $373 | 4 |
| Henn Matthew R — See Remarks | 2 | — | 1 leg · 81 sh · $369 | 4 |
| Brady Kelly — See Remarks | 2 | — | 1 leg · 64 sh · $291 | 4 |
| Ausiello Dennis A — Director | 2 | — | — | 2 |
| Berenson Stephen — Director | 2 | — | — | 2 |
| Rosiello Robert L. — Director | 2 | — | — | 2 |
| Dere Willard H — Director | 1 | — | — | 1 |
| Fraser Claire — Director | 1 | — | — | 1 |
| Graves Kurt — Director | 1 | — | — | 1 |
+2 more insiders in the window, not shown — every filing appears in the table below.
Recent Form 4 filings — Seres Therapeutics, Inc.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-18 | 4 | Brady Kelly — See Remarks | Option exercise (M): 181 · Sale (S): 64 @ $4.55 · Option exercise (M): 90 (derivative) @ $0 · Option exercise (M): 91 (derivative) @ $0 | EDGAR |
| 2026-08-18 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 238 · Sale (S): 81 @ $4.55 · Option exercise (M): 140 (derivative) @ $0 · Option exercise (M): 98 (derivative) @ $0 | EDGAR |
| 2026-08-18 | 4 | Shaff Eric D. — Director | Option exercise (M): 722 · Sale (S): 263 @ $4.55 · Option exercise (M): 390 (derivative) @ $0 · Option exercise (M): 332 (derivative) @ $0 | EDGAR |
| 2026-08-18 | 4 | DesRosier Thomas — See Remarks | Option exercise (M): 245 · Sale (S): 82 @ $4.55 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 112 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Rosiello Robert L. — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Berenson Stephen — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Henn Matthew R — See Remarks | Grant/award (A): 25,000 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Thorell Marella — See Remarks | Grant/award (A): 7,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Shaff Eric D. — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Brady Kelly — See Remarks | Grant/award (A): 18,750 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | DesRosier Thomas — See Remarks | Grant/award (A): 7,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Graves Kurt — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Fraser Claire — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Ausiello Dennis A — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Kender Richard N — See Remarks, Director | Grant/award (A): 50,000 (derivative) @ $0 | EDGAR |
| 2026-07-10 | 4 | Dere Willard H — Director | Grant/award (A): 6,500 (derivative) @ $0 | EDGAR |
| 2026-07-02 | 4 | Berenson Stephen — Director | Grant/award (A): 7,508 (derivative) @ $0 | EDGAR |
| 2026-07-02 | 4 | Rosiello Robert L. — Director | Grant/award (A): 7,508 (derivative) @ $0 | EDGAR |
| 2026-07-02 | 4 | Ausiello Dennis A — Director | Grant/award (A): 7,508 (derivative) @ $0 | EDGAR |
| 2026-05-19 | 4 | Shaff Eric D. — Director | Option exercise (M): 722 · Sale (S): 259 @ $7.53 · Option exercise (M): 391 (derivative) @ $0 · Option exercise (M): 331 (derivative) @ $0 | EDGAR |
| 2026-05-19 | 4 | Brady Kelly — See Remarks | Option exercise (M): 180 · Sale (S): 59 @ $7.53 · Option exercise (M): 89 (derivative) @ $0 · Option exercise (M): 91 (derivative) @ $0 | EDGAR |
| 2026-05-19 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 238 · Sale (S): 77 @ $7.53 · Option exercise (M): 141 (derivative) @ $0 · Option exercise (M): 97 (derivative) @ $0 | EDGAR |
| 2026-05-19 | 4 | DesRosier Thomas — See Remarks | Option exercise (M): 244 · Sale (S): 79 @ $7.53 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 111 (derivative) @ $0 | EDGAR |
| 2026-03-11 | 4 | Brady Kelly — See Remarks | Grant/award (A): 56,250 (derivative) @ $0 | EDGAR |
| 2026-03-06 | 4 | Henn Matthew R — See Remarks | Grant/award (A): 75,000 (derivative) @ $0 | EDGAR |
| 2026-03-06 | 4 | Thorell Marella — See Remarks | Grant/award (A): 22,500 (derivative) @ $0 | EDGAR |
| 2026-03-06 | 4 | DesRosier Thomas — See Remarks | Grant/award (A): 22,500 (derivative) @ $0 | EDGAR |
| 2026-03-06 | 4 | Kender Richard N — See Remarks, Director | Grant/award (A): 150,000 (derivative) @ $0 | EDGAR |
| 2026-02-18 | 4 | Young Teresa L. — See Remarks | Option exercise (M): 231 · Sale (S): 75 @ $8.47 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 98 (derivative) @ $0 | EDGAR |
| 2026-02-18 | 4 | Shaff Eric D. — Director | Option exercise (M): 723 · Sale (S): 259 @ $8.47 · Option exercise (M): 391 (derivative) @ $0 · Option exercise (M): 333 (derivative) @ $0 | EDGAR |
| 2026-02-18 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 239 · Sale (S): 89 @ $8.47 · Option exercise (M): 141 (derivative) @ $0 · Option exercise (M): 98 (derivative) @ $0 | EDGAR |
| 2026-02-18 | 4 | DesRosier Thomas — See Remarks | Option exercise (M): 244 · Sale (S): 78 @ $8.47 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 111 (derivative) @ $0 | EDGAR |
| 2025-11-18 | 4 | Young Teresa L. — See Remarks | Option exercise (M): 3,998 · Option exercise (M): 132 · Option exercise (M): 98 · Sale (S): 1,042 @ $17.30 · Option exercise (M): 3,998 (derivative) @ $0 · Option exercise (M): 132 (derivative) @ $0 · +1 more | EDGAR |
| 2025-11-18 | 4 | Shaff Eric D. — Director | 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 |
| 2025-11-18 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 3,998 · Option exercise (M): 140 · Option exercise (M): 98 · Sale (S): 1,257 @ $17.30 · Option exercise (M): 3,998 (derivative) @ $0 · Option exercise (M): 140 (derivative) @ $0 · +1 more | EDGAR |
| 2025-11-18 | 4 | DesRosier Thomas — See Remarks | Option exercise (M): 132 · Option exercise (M): 112 · Sale (S): 76 @ $17.30 · Option exercise (M): 132 (derivative) @ $0 · Option exercise (M): 112 (derivative) @ $0 | EDGAR |
| 2025-09-30 | 4 | Young Teresa L. — See Remarks | Grant/award (A): 3,998 (derivative) @ $0 | EDGAR |
| 2025-09-30 | 4 | Henn Matthew R — See Remarks | Grant/award (A): 3,998 (derivative) @ $0 | EDGAR |
| 2025-08-19 | 4 | Young Teresa L. — See Remarks | Option exercise (M): 133 · Option exercise (M): 97 · Sale (S): 59 @ $16.65 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 97 (derivative) @ $0 | EDGAR |
| 2025-08-19 | 4 | Shaff Eric D. — Director | 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 |
| 2025-08-19 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 141 · Option exercise (M): 97 · Sale (S): 73 @ $16.65 · Option exercise (M): 141 (derivative) @ $0 · Option exercise (M): 97 (derivative) @ $0 | EDGAR |
| 2025-08-19 | 4 | DesRosier Thomas — See Remarks | Option exercise (M): 133 · Option exercise (M): 111 · Sale (S): 76 @ $16.65 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 111 (derivative) @ $0 | EDGAR |
| 2025-08-06 | 4 | Rosiello Robert L. — Director | Grant/award (A): 10,000 (derivative) @ $0 | EDGAR |
| 2025-07-02 | 4 | Berenson Stephen — Director | Grant/award (A): 11,470 (derivative) @ $0 | EDGAR |
| 2025-07-02 | 4 | Fraser Claire — Director | Grant/award (A): 6,452 (derivative) @ $0 | EDGAR |
| 2025-07-02 | 4 | Ausiello Dennis A — Director | Grant/award (A): 6,452 (derivative) @ $0 | EDGAR |
| 2025-05-19 | 4 | Young Teresa L. — See Remarks | Option exercise (M): 133 · Option exercise (M): 98 · Sale (S): 63 @ $7.28 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 98 (derivative) @ $0 | EDGAR |
| 2025-05-19 | 4 | Shaff Eric D. — CEO and President, Director | 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 |
| 2025-05-19 | 4 | Henn Matthew R — See Remarks | Option exercise (M): 140 · Option exercise (M): 98 · Sale (S): 77 @ $7.28 · Option exercise (M): 140 (derivative) @ $0 · Option exercise (M): 98 (derivative) @ $0 | EDGAR |
| 2025-05-19 | 4 | DesRosier Thomas — Chief Legal Officer and EVP | Option exercise (M): 133 · Option exercise (M): 111 · Sale (S): 79 @ $7.28 · Option exercise (M): 133 (derivative) @ $0 · Option exercise (M): 111 (derivative) @ $0 | EDGAR |
Recent 8-K events — Seres Therapeutics, Inc.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-05 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-04 | 8-K | 1.01 — Entry into a Material Definitive Agreement 1.02 — Termination of a Material Definitive Agreement 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-08 | 8-K | 7.01 — Regulation FD Disclosure 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-08 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 5.07 — Submission of Matters to a Vote of Security Holders 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-05 | 8-K | 1.01 — Entry into a Material Definitive Agreement 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-01 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers | EDGAR |
| 2026-05-05 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-03-16 | 8-K | 8.01 — Other Events | EDGAR |
| 2026-03-12 | 8-K | 2.02 — Results of Operations and Financial Condition 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-03-02 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 9.01 — Financial Statements and Exhibits | EDGAR |
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