As of the latest Form 4 filed Jul 10, 2026.
What Insmed Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 81 most recent filings for INSM.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-07-10 | 2026-07-09 | Lewis William Chair and CEO | SSale | −3.36K | $118.52 | $398K | Yes (planned) | Form 4 ↗ |
| 2026-07-10 | 2026-07-09 | Lewis William, Chair and CEO | SSale | −2.33K | $117.62 | $275K | Yes (planned) | Form 4 ↗ |
| 2026-07-10 | 2026-07-09 | Lewis William, Chair and CEO | SSale | −5.00K | $116.55 | $583K | Yes (planned) | Form 4 ↗ |
| 2026-07-10 | 2026-07-09 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-07-10 | 2026-07-09 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-07-08 | 2026-07-06 | Flammer Martina M.D. Chief Medical Officer | SSale | −7.45K | $110.60 | $824K | Yes (planned) | Form 4 ↗ |
| 2026-07-08 | 2026-07-06 | Flammer Martina M.D., Chief Medical Officer | SSale | −4.85K | $109.02 | $529K | Yes (planned) | Form 4 ↗ |
| 2026-07-08 | 2026-07-06 | Flammer Martina M.D., Chief Medical Officer | MExercise | +4.36K | $19.74 | $86.0K | Yes (planned) | Form 4 ↗ |
| 2026-07-08 | 2026-07-06 | Flammer Martina M.D., Chief Medical Officer | MExercise | +7.95K | $29.13 | $231K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William Chair and CEO | SSale | −1.29K | $106.27 | $137K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | SSale | −2.46K | $105.27 | $259K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | SSale | −3.72K | $104.28 | $388K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | SSale | −1.84K | $103.10 | $189K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | SSale | −12.1K | $102.34 | $1.24M | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | MExercise | +8.88K | $17.16 | $152K | Yes (planned) | Form 4 ↗ |
| 2026-06-26 | 2026-06-25 | Lewis William, Chair and CEO | MExercise | +12.5K | $30.46 | $381K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-23 | Butera Samuele SVP, GM, Global Respiratory | AAward | +7.34K | — | — | No | Form 4 ↗ |
| 2026-06-24 | 2026-06-22 | Smith Michael Alexander Chief Legal Officer | SSale | −1.81K | $95.82 | $173K | Yes (planned) | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | Lewis William Chair and CEO | SSale | −6.51K | $94.03 | $613K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-05 | Flammer Martina M.D. Chief Medical Officer | SSale | −1.86K | $103.78 | $193K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Smith Michael Alexander Chief Legal Officer | SSale | −2.16K | $102.27 | $221K | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Flammer Martina M.D. Chief Medical Officer | SSale | −2.57K | $102.27 | $262K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Adsett Roger Chief Operating Officer | SSale | −2.37K | $102.27 | $242K | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Bonstein Sara Chief Financial Officer | SSale | −2.40K | $102.27 | $246K | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Lewis William Chair and CEO | SSale | −7.61K | $102.27 | $778K | No | Form 4 ↗ |
| 2026-05-22 | 2026-05-22 | Smith Michael Alexander Chief Legal Officer | SSale | −6.15K | $108.47 | $667K | Yes (planned) | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Lewis William Chair and CEO | SSale | −7.97K | $106.97 | $853K | Yes (planned) | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Lewis William, Chair and CEO | SSale | −11.8K | $106.39 | $1.26M | Yes (planned) | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Lewis William, Chair and CEO | SSale | −5.75K | $105.32 | $606K | Yes (planned) | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-05-15 | 2026-05-14 | Flammer Martina M.D. Chief Medical Officer | SSale | −10.5K | $117.54 | $1.23M | Yes (planned) | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Smith Michael Alexander Chief Legal Officer | SSale | −4.11K | $116.18 | $477K | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Flammer Martina M.D. Chief Medical Officer | SSale | −3.38K | $116.18 | $393K | Yes (planned) | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Flammer Martina M.D., Chief Medical Officer | SSale | −4.47K | $112.76 | $504K | Yes (planned) | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Desjardins Clarissa Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | ANDERSON ELIZABETH M Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | LEE LEO Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Adsett Roger Chief Operating Officer | SSale | −5.84K | $116.18 | $678K | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Brennan David R Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Bonstein Sara Chief Financial Officer | SSale | −8.27K | $116.18 | $961K | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Lewis William Chair and CEO | SSale | −13.3K | $116.18 | $1.54M | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | SCHAFER CAROL Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | SHAROKY MELVIN MD Director | AAward | +3.31K | — | — | No | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Flammer Martina M.D. Chief Medical Officer | SSale | −830.00 | $101.18 | $84.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Flammer Martina M.D., Chief Medical Officer | SSale | −12.1K | $100.35 | $1.22M | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Flammer Martina M.D., Chief Medical Officer | MExercise | +12.9K | $17.07 | $221K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William Chair and CEO | SSale | −381.00 | $139.60 | $53.2K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | SSale | −1.25K | $139.09 | $173K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | SSale | −2.72K | $137.86 | $375K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | SSale | −5.32K | $137.01 | $729K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | SSale | −599.00 | $135.18 | $81.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | SSale | −433.00 | $134.18 | $58.1K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-05-06 | 2026-05-04 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William Chair and CEO | SSale | −825.00 | $145.79 | $120K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William, Chair and CEO | SSale | −2.25K | $144.66 | $326K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William, Chair and CEO | SSale | −5.37K | $143.81 | $773K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William, Chair and CEO | SSale | −2.25K | $142.99 | $321K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-04-17 | 2026-04-16 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | Lewis William Chair and CEO | SSale | −1.43K | $164.01 | $235K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | Lewis William, Chair and CEO | SSale | −8.48K | $163.23 | $1.38M | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | Lewis William, Chair and CEO | SSale | −787.00 | $161.73 | $127K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-04-08 | 2026-04-06 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-03-31 | 2026-03-30 | Smith Michael Alexander Chief Legal Officer | SSale | −19.6K | $150.98 | $2.96M | Yes (planned) | Form 4 ↗ |
| 2026-03-31 | 2026-03-30 | Smith Michael Alexander, Chief Legal Officer | MExercise | +14.0K | $27.89 | $390K | Yes (planned) | Form 4 ↗ |
| 2026-03-31 | 2026-03-30 | Smith Michael Alexander, Chief Legal Officer | MExercise | +5.65K | $17.07 | $96.4K | Yes (planned) | Form 4 ↗ |
| 2026-03-20 | 2026-03-19 | Lewis William Chair and CEO | SSale | −4.53K | $144.11 | $653K | Yes (planned) | Form 4 ↗ |
| 2026-03-20 | 2026-03-19 | Lewis William, Chair and CEO | SSale | −4.54K | $143.42 | $651K | Yes (planned) | Form 4 ↗ |
| 2026-03-20 | 2026-03-19 | Lewis William, Chair and CEO | SSale | −1.63K | $142.17 | $232K | Yes (planned) | Form 4 ↗ |
| 2026-03-20 | 2026-03-19 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-03-20 | 2026-03-19 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William Chair and CEO | SSale | −2.13K | $147.54 | $314K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William, Chair and CEO | SSale | −3.90K | $146.66 | $572K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William, Chair and CEO | SSale | −2.59K | $145.27 | $376K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William, Chair and CEO | SSale | −2.08K | $144.23 | $300K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William, Chair and CEO | MExercise | +4.44K | $17.16 | $76.2K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-05 | Lewis William, Chair and CEO | MExercise | +6.26K | $30.46 | $191K | Yes (planned) | Form 4 ↗ |
| 2026-03-05 | 2026-03-03 | SHAROKY MELVIN MD Director | GGift | −100.00 | $0.00 | $0.00 | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also INSM’s full analysis or the market-wide insider trading feed. The tabs above jump to INSM’s other SEC data.
Source: SEC Form 4 filings for INSM, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.