Form 4 for INSM INSMED Inc
Accepted 2025-12-19 00:00:00 ET · period of report 2025-12-18 · accession 0001628280-25-058269 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2025-12-19 | 2025-12-18 | INSM | Lewis William | COB, CEO, Dir | M - OptEx | $24.94 | +10.7K | 308.4K | +4% | +$266.8K |
| DM | 2025-12-19 | 2025-12-18 | INSM | Lewis William | COB, CEO, Dir | S - Sale+OE | $166.97 | -10.7K | 309.9K | -3% | -$1.79M |
| DM | 2025-12-19 | 2025-12-18 | INSM | Lewis William | COB, CEO, Dir | M - OptEx | $0.00 | -10.7K | 87.6K | -11% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2025-12-18 | M | A | 6,259 | $30.46 | 314,610 | D | — | — | |
| 2 | Common | Common Stock | 2025-12-18 | S | D | 350 | $162.26 | 314,260 | D | — | — | (F2) This is the weighted average sales price representing 350 shares sold at prices ranging from $161.72 to $162.69 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 3 | Common | Common Stock | 2025-12-18 | S | D | 1,465 | $163.19 | 312,795 | D | — | — | (F3) This is the weighted average sales price representing 1,465 shares sold at prices ranging from $162.72 to $163.62 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 4 | Common | Common Stock | 2025-12-18 | S | D | 447 | $164.24 | 312,348 | D | — | — | (F4) This is the weighted average sales price representing 447 shares sold at prices ranging from $163.75 to $164.73 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 5 | Common | Common Stock | 2025-12-18 | S | D | 697 | $165.21 | 311,651 | D | — | — | (F5) This is the weighted average sales price representing 697 shares sold at prices ranging from $164.83 to $165.67 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 6 | Common | Common Stock | 2025-12-18 | S | D | 1,431 | $167.29 | 308,437 | D | — | — | (F7) This is the weighted average sales price representing 1,431 shares sold at prices ranging from $167.00 to $167.95 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 7 | Common | Common Stock | 2025-12-18 | S | D | 2,175 | $168.54 | 306,262 | D | — | — | (F8) This is the weighted average sales price representing 2,175 shares sold at prices ranging from $168.01 to $169.00 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 8 | Common | Common Stock | 2025-12-18 | S | D | 1,938 | $169.58 | 304,324 | D | — | — | (F9) This is the weighted average sales price representing 1,938 shares sold at prices ranging from $169.01 to $170.00 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 9 | Common | Common Stock | 2025-12-18 | S | D | 362 | $170.26 | 303,962 | D | — | — | (F10) This is the weighted average sales price representing 362 shares sold at prices ranging from $170.02 to $170.91 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 10 | Common | Common Stock | 2025-12-18 | S | D | 51 | $171.20 | 303,911 | D | — | — | (F11) This is the weighted average sales price representing 51 shares sold at prices ranging from $171.09 to $171.35 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 11 | Common | Common Stock | 2025-12-18 | M | A | 4,440 | $17.16 | 308,351 | D | — | — | |
| 12 | Common | Common Stock | 2025-12-18 | S | D | 1,783 | $166.60 | 309,868 | D | — | — | (F6) This is the weighted average sales price representing 1,783 shares sold at prices ranging from $166.00 to $166.99 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request. |
| 13 | Derivative | Stock Option (right to buy) | 2025-12-18 | M | D | 4,440 | $0.00 | 62,160 | D | $17.16 · — to 2027-05-17 | 4,440 Common Stock | (F12) The options became exercisable based on the following vesting schedule: 25% vested on the first anniversary of the grant date and an additional 12.5% vested on each sixth month anniversary date thereafter through the fourth anniversary of the date of grant. All options are currently exercisable. |
| 14 | Derivative | Stock Option (right to buy) | 2025-12-18 | M | D | 6,259 | $0.00 | 87,627 | D | $30.46 · — to 2028-01-04 | 6,259 Common Stock | (F12) The options became exercisable based on the following vesting schedule: 25% vested on the first anniversary of the grant date and an additional 12.5% vested on each sixth month anniversary date thereafter through the fourth anniversary of the date of grant. All options are currently exercisable. |