SEC Form 4 · accession 0001402051-26-000042
INSMED Inc · INSM
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
William Lewis
Officer — Chair and CEO · Director
Period of report
Jul 23, 2026
Accepted (ET)
Jul 24, 2026 · 5:02 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001104506
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Jul 23, 2026 | M | 6,260 | $30.46 | A | 265,318 | D | |
| Common Stock | Jul 23, 2026 | M | 4,440 | $17.16 | A | 269,758 | D | |
| Common StockF2 | Jul 23, 2026 | S | 4,828 | $105.62 | D | 264,930 | D | |
| Common StockF3 | Jul 23, 2026 | S | 5,872 | $106.43 | D | 259,058 | D | |
| Common Stock | holding | — | — | — | 233,924 | I | By trust |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (right to buy)F4 | $30.46 | Jul 23, 2026 | M | 6,260 | D | — | Jan 4, 2028 | Common Stock | 6,260 | 0 | D |
| Stock Option (right to buy)F4 | $17.16 | Jul 23, 2026 | M | 4,440 | D | — | May 17, 2027 | Common Stock | 4,440 | 0 | D |
Explanation of responses
- F1This transaction was effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on September 4, 2025, in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.
- F2This is the weighted average sales price representing 4,828 shares sold at prices ranging from $105.09 to $106.02 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.
- F3This is the weighted average sales price representing 5,872 shares sold at prices ranging from $106.09 to $106.78 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.
- F4The 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.