Seres Therapeutics, Inc. (MCRB) insider trading.
In Q3 2026, insiders at Seres Therapeutics, Inc. reported 8 non-derivative transactions on 19 Forms 3, 4 and 5: 0 open-market purchases and 4 sales worth $2K.
- Transactions
- 8
- Purchases (P)
- 0
- Sales (S)
- 4
- Net shares, P minus S
- -490
- Insiders
- 4
- Last filed
- 2026-08-18
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| DesRosier Thomas | Officer · See Remarks | 2 | 0 | 1 |
| Henn Matthew R | Officer · See Remarks | 2 | 0 | 1 |
| Shaff Eric D. | Director | 2 | 0 | 1 |
| Brady Kelly | Officer · See Remarks | 2 | 0 | 1 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-08-17 | DesRosier Thomas | S (D) | 82 | $4.55 | 8,117 | Form 4 |
| 2026-08-17 | Henn Matthew R | S (D) | 81 | $4.55 | 7,995 | Form 4 |
| 2026-08-17 | Shaff Eric D. | S (D) | 263 | $4.55 | 12,499 | Form 4 |
| 2026-08-17 | Brady Kelly | S (D) | 64 | $4.55 | 8,679 | Form 4 |
| 2026-08-15 | DesRosier Thomas | M (A) | 245 | — | 8,199 | Form 4 |
| 2026-08-15 | Henn Matthew R | M (A) | 238 | — | 8,076 | Form 4 |
| 2026-08-15 | Shaff Eric D. | M (A) | 722 | — | 12,762 | Form 4 |
| 2026-08-15 | Brady Kelly | M (A) | 181 | — | 8,743 | Form 4 |
Transaction codes in this quarter
Get MCRB insider transactions through the API
curl "https://sec-api.dev/api/v1/insider-transactions?period=2026q3&cik=1609809&limit=100" \
-H "Authorization: Bearer $SEC_API_KEY"Insider trading API guide · MCRB company page · Seres Therapeutics, Inc. on SEC.gov
Questions
Are insiders buying or selling Seres Therapeutics, Inc. (MCRB)?
In Q3 2026, insiders at Seres Therapeutics, Inc. reported 8 non-derivative transactions on 19 Forms 3, 4 and 5: 0 open-market purchases and 4 sales worth $2K. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Seres Therapeutics, Inc. insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Plain-text version for agents and LLMs: /insider-trading/mcrb.md
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.