Smith Michael Alexander 4

4 · INSMED Inc · Filed Feb 25, 2026

Form 4

Period: 2026-02-24

Chief Legal Officer

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-02-24$17.07/sh+20,248$345,633→ 76,645 total
Sale
Common Stock
[F1][F2]
2026-02-24$153.93/sh−4,852$746,868→ 71,793 total
Sale
Common Stock
[F1][F3]
2026-02-24$155.06/sh−4,151$643,654→ 67,642 total
Sale
Common Stock
[F1][F4]
2026-02-24$156.53/sh−15,771$2,468,635→ 51,871 total
Exercise/Conversion
Stock Option (right to buy)
[F1][F5]
2026-02-24−20,248→ 14,282 total
Exercise: $17.07Exp: 2032-05-11→ Common Stock (20,248 underlying)

Footnotes (5)

[F1]This transaction was effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 7, 2025 in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.
[F2]This is the weighted average sales price representing 4,852 shares sold at prices ranging from $153.47 to $154.46 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.
[F3]This is the weighted average sales price representing 4,151 shares sold at prices ranging from $154.47 to $155.45 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.
[F4]This is the weighted average sales price representing 15,771 shares sold at prices ranging from $156.00 to $156.86 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.
[F5]The options become exercisable based on the following vesting schedule: 25% vest on the first anniversary of the grant date and an additional 12.5% vest on each sixth month anniversary date thereafter through the fourth anniversary of the date of grant.

Signature

/s/ Michael A. Smith|2026-02-26

Documents

1 file