Company profile
Seres Therapeutics, Inc. Insider Trading
MCRBEvery SEC Form 4 insider trading filing for Seres Therapeutics, Inc. (MCRB) since April 2023: open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Pharmaceutical Preparations
- CIK
- 0001609809
- Filings
- 129
- Insiders
- 20
- Last filing
- 2026-08-17
Activity summary
No insider transactions in the last 30 days. The most recent was on August 17, 2026, when Thomas DesRosier sold 82 shares. 129 filings from 20 insiders are on record below.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Seres Therapeutics, Inc. insiders were net sellers in every quarter shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $47K.
90 day insight
Over the last 90 days, Seres Therapeutics, Inc. insiders bought $0 across 27 transactions with no open-market sales.
- Most active insider: Eric D. Shaff with 5 transactions totaling $1K.
- Largest single sale: $1K by Eric D. Shaff on Aug 17, 2026.
- 100% of recent sales were pre-scheduled 10b5-1 trades, typically less informative than open-market activity.
Activity skews bullish: buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 17, 2026 | Thomas DesRosier | MCRB | Sale10b5 | 82 | $4.55 | $373 |
| Aug 17, 2026 | Matthew R Henn | MCRB | Sale10b5 | 81 | $4.55 | $369 |
| Aug 17, 2026 | Eric D. Shaff | MCRB | Sale10b5 | 263 | $4.55 | $1K |
| Aug 17, 2026 | Kelly Brady | MCRB | Sale10b5 | 64 | $4.55 | $291 |
| Aug 15, 2026 | Thomas DesRosier | MCRB | Option Exercise | 245 | — | — |
45 more transactions hidden
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Institutional Ownership
Top 13F-HR holders of Seres Therapeutics, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings: institutional holders report positions within 45 days of quarter end. Joined with insider activity above: see who's loading up institutionally while insiders are trading. Full 13F-HR API →