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sellWeak cluster of 610b5-1 plan

Martina Flammer M.D. sold $771k of INSM

Chief Medical Officer at INSMED Inc. 11,724 shares at an average of $65.79, traded May 15, 2025, filed May 19, 2025.

Warning score
37
Value
$771k
11,724 shares
Holdings after
84,797
-12% from before
From 52-week low
+4%
low $64.81, close $67.22
From 52-week high
-20%
high $83.83, as of May 15, 2025

Score components

  • Role
    Officer
    +15
  • Trade size
    $771k at market
    +22
  • Share of holdings sold
    Sold 12% of holdings
    +5
  • Cluster
    6 insiders selling within 14 days
    +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.

This signal so far: 1m +46.5%, 3m +87.5%, 6m +190.8%.

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.

INSMOct 9, 2026 · close 100.60
Since filing May 19, 2025: +48.2%SPY +33.1% · excess +15.1%

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 0001628280-25-026581, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
May 15, 2025AGrant or award
Common Stock10b5-1
+6,508$0.00$096,521May 19, 2025
May 15, 2025SOpen-market sale
Common Stock10b5-1
-9,925$65.47$650k86,596May 19, 2025
May 16, 2025SOpen-market sale
Common Stock10b5-1
-1,799$67.53$121k84,797May 19, 2025
May 15, 2025AGrant or award
Stock Option (right to buy)derivative10b5-1
+31,610$0.00$031,610May 19, 2025

Related signals

Other insiders at INSMED Inc and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
50Moderate
INSMsell
INSMED Inc
David R Brennan
director
$3.1M
25,000 shares
-39%
23Weak
INSMsell 210b5-1
INSMED Inc
William Lewis
Chair and CEO
$2.2M
21,398 shares
-8%
14Weak
INSMsell 210b5-1
INSMED Inc
Michael Alexander Smith
Chief Legal Officer
$173k
1,806 shares
-5%
40Moderate
INSMsell 510b5-1
INSMED Inc
William Lewis
Chair and CEO
$613k
6,515 shares
-2%
48Moderate
INSMsell 5
INSMED Inc
Roger Adsett
Chief Operating Officer
$242k
2,370 shares
-2%
50Moderate
INSMsell 5
INSMED Inc
Sara Bonstein
Chief Financial Officer
$246k
2,404 shares
-3%
27Weak
INSMsell 510b5-1
INSMED Inc
Martina Flammer M.D.
Chief Medical Officer
$455k
4,424 shares
-7%
62Notable
INSMsell 5
INSMED Inc
William Lewis
Chair and CEO
$778k
7,605 shares
-3%
42Moderate
INSMsell 5
INSMED Inc
Michael Alexander Smith
Chief Legal Officer
$221k
2,159 shares
-5%
35Weak
INSMsell 510b5-1
INSMED Inc
Michael Alexander Smith
Chief Legal Officer
$667k
6,149 shares
-13%

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.

Martina Flammer M.D. sold $771k of INSM | InsiderTell