Michael Alexander Smith sold $3.5M of INSM
Chief Legal Officer at INSMED Inc. 24,272 shares at an average of $143.89, traded Sep 2, 2025, filed Sep 4, 2025.
Score components
- +15RoleOfficer
- +25Trade size$3.5M at market
- +10Share of holdings soldSold 31% of holdings
- +15Cluster5 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.
This signal so far: 1m +10.3%, 3m +43.9%, 6m +0.7%.
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 0001870278-25-000009, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Sep 2, 2025 | MOption exercise Common Stock10b5-1 | +12,780 | $30.46 | $389k | 79,174 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -1,354 | $141.16 | $191k | 77,820 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -1,100 | $142.06 | $156k | 76,720 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -7,391 | $143.16 | $1.1M | 69,329 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -8,300 | $144.16 | $1.2M | 61,029 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -4,944 | $145.18 | $718k | 56,085 | Sep 4, 2025 |
| Sep 2, 2025 | SOpen-market sale Common Stock10b5-1 | -1,183 | $145.89 | $173k | 54,902 | Sep 4, 2025 |
| Sep 2, 2025 | MOption exercise Stock Option (right to buy)derivative10b5-1 | -12,780 | $0.00 | $0 | 0 | Sep 4, 2025 |
Related signals
Other insiders at INSMED Inc and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 50Moderate | INSMsell INSMED Inc | David R Brennan director | $3.1M 25,000 shares | -39% | |
| 70Notable | INSMED Inc | Melvin Sharoky Md director | $638k 5,000 shares | -100% | |
| 65Notable | INSMED Inc | Roger Adsett Chief Operating Officer | $32M 239,850 shares | -71% | |
| 30Weak | INSMED Inc | Martina Flammer M.D. Chief Medical Officer | $3.5M 27,173 shares | -31% | |
| 23Weak | INSMED Inc | William Lewis Chair and CEO | $1.1M 10,700 shares | -4% | |
| 23Weak | INSMED Inc | William Lewis Chair and CEO | $1.3M 10,699 shares | -4% | |
| 25Weak | INSMED Inc | Martina Flammer M.D. Chief Medical Officer | $1.4M 12,302 shares | -17% | |
| 30Weak | INSMED Inc | William Lewis Chair and CEO | $2.2M 21,398 shares | -8% | |
| 21Weak | INSMED Inc | Michael Alexander Smith Chief Legal Officer | $173k 1,806 shares | -5% | |
| 40Moderate | INSMED Inc | William Lewis Chair and CEO | $613k 6,515 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.