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sellWeak cluster of 410b5-1 plan

Eric D. Shaff sold $1,602 of MCRB

CEO and President at Seres Therapeutics, Inc.. 220 shares at an average of $7.28, traded May 16, 2025, filed May 19, 2025.

Warning score
5
Value
$1,602
220 shares
Holdings after
10,102
-2% from before
From 52-week low
+10%
low $6.77, close $7.46
From 52-week high
-68%
high $23.20, as of May 16, 2025

Score components

  • Role
    CEO
    +25
  • Trade size
    $2k at market
    0
  • Share of holdings sold
    Sold 2.1% of holdings
    0
  • Cluster
    4 insiders selling within 14 days
    +15
  • Exercise and sell
    Shares came from an option exercise in the same filing
    -15
  • 10b5-1 plan
    Pre-scheduled under a 10b5-1 plan
    -20

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.

MCRBOct 9, 2026 · close 2.71
Since filing May 19, 2025: -66.0%SPY +33.1% · excess -99.1%

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 0000950170-25-074327, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
May 15, 2025MOption exercise
Common Stock10b5-1
+390--9,991May 19, 2025
May 15, 2025MOption exercise
Common Stock10b5-1
+331--10,322May 19, 2025
May 16, 2025SOpen-market sale
Common Stock10b5-1
-220$7.28$1,60210,102May 19, 2025
May 15, 2025MOption exercise
Restricted Stock Unitsderivative10b5-1
-390$0.00$02,735May 19, 2025
May 15, 2025MOption exercise
Restricted Stock Unitsderivative10b5-1
-331$0.00$03,653May 19, 2025

Related signals

Other insiders at Seres Therapeutics, Inc. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Thomas DesRosier
See Remarks
$1,315
76 shares
-1%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Matthew R Henn
See Remarks
$22k
1,257 shares
-14%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Eric D. Shaff
CEO and President
$3,754
217 shares
-2%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Teresa L. Young
See Remarks
$18k
1,042 shares
-11%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Thomas DesRosier
See Remarks
$1,265
76 shares
-1%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Matthew R Henn
See Remarks
$1,215
73 shares
-2%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Eric D. Shaff
CEO and President
$3,613
217 shares
-2%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Teresa L. Young
See Remarks
$982
59 shares
-1%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Thomas DesRosier
Chief Legal Officer and EVP
$575
79 shares
-1%
0Weak
MCRBsell 410b5-1
Seres Therapeutics, Inc.
Matthew R Henn
See Remarks
$561
77 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.

Eric D. Shaff sold $1,602 of MCRB | InsiderTell