Eric D. Shaff sold $1,950 of MCRB
CEO and President at Seres Therapeutics, Inc.. 259 shares at an average of $7.53, traded May 18, 2026, filed May 19, 2026.
Score components
- +15RoleDirector
- 0Trade size$2k at market
- 0Share of holdings soldSold 2.1% of holdings
- +15Cluster4 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001193125-26-230733, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| May 15, 2026 | MOption exercise Common Stock10b5-1 | +722 | - | - | 12,299 | May 19, 2026 |
| May 18, 2026 | SOpen-market sale Common Stock10b5-1 | -259 | $7.53 | $1,950 | 12,040 | May 19, 2026 |
| May 15, 2026 | MOption exercise Restricted Stock Unitsderivative10b5-1 | -391 | $0.00 | $0 | 1,173 | May 19, 2026 |
| May 15, 2026 | MOption exercise Restricted Stock Unitsderivative10b5-1 | -331 | $0.00 | $0 | 2,325 | May 19, 2026 |
Related signals
Other insiders at Seres Therapeutics, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 0Weak | Seres Therapeutics, Inc. | Kelly Brady See Remarks | $291 64 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Thomas DesRosier See Remarks | $373 82 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Matthew R. Henn See Remarks | $369 81 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Eric D. Shaff CEO and President | $1,197 263 shares | -2% | |
| 15Weak | Seres Therapeutics, Inc. | Kelly Brady See Remarks | $444 59 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Thomas DesRosier See Remarks | $595 79 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Matthew R. Henn See Remarks | $580 77 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Thomas DesRosier See Remarks | $661 78 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Matthew R. Henn See Remarks | $754 89 shares | -1% | |
| 0Weak | Seres Therapeutics, Inc. | Eric D. Shaff CEO and President | $2,194 259 shares | -2% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.