Michael A. Smith - 30 Mar 2026 Form 4 Insider Report for INSMED Inc (INSM)

Reporting relationship: Chief Legal Officer
Issuer ticker: INSM
Reported as of: 30 Mar 2026
Net transaction value: -$2,964,945
SEC form: 4
Accepted by SEC: 31 Mar 2026, 16:13:26 UTC
Prior SEC filing: 25 Feb 2026
Next SEC filing: 15 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael A. Smith

Key filing fact

Michael A. Smith filed Form 4 for INSMED Inc (INSM) on 31 Mar 2026.

Key facts

This page summarizes Michael A. Smith's Form 4 filing for INSMED Inc (INSM).
5 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 31 Mar 2026, 16:13.

Change

Previous filing in this sequence was filed on 25 Feb 2026.
Current net transaction value: -$2,964,945.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001870278 Primary reporting owner

Smith Michael Alexander

Relationship: Chief Legal Officer
Address: 700 US HIGHWAY 202/206, BRIDGEWATER
Signature: /s/ Michael A. Smith
Signature date: 31 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

INSM transaction

Common Stock

Options Exercise

Transaction value
Shares: +5,649
Change %: +11%
Price: $17.07^*
Shares after: 57,520
Date: 30 Mar 2026
Ownership: Direct
Footnotes: F1

INSM transaction

Common Stock

Options Exercise

Transaction value
Shares: +13,989
Change %: +24%
Price: $27.89^*
Shares after: 71,509
Date: 30 Mar 2026
Ownership: Direct
Footnotes: F1

INSM transaction

Common Stock

Sale

Transaction value: $2,964,945
Shares: -19,638
Change %: -27%
Price: $150.98
Shares after: 51,871
Date: 30 Mar 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

INSM transaction Derivative

Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -5,649
Change %: -40%
Price: $0.000000^*
Shares after: 8,633
Date: 30 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,649
Exercise price: $17.07
Footnotes: F1, F2

INSM transaction Derivative

Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -13,989
Change %: -43%
Price: $0.000000^*
Shares after: 18,561
Date: 30 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 13,989
Exercise price: $27.89
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote 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.

Footnote F2

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.

Footnote F3

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.