Leo Lee - 13 May 2026 Form 4 Insider Report for INSMED Inc (INSM)

Reporting relationship: Director
Issuer ticker: INSM
Reported as of: 13 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 May 2026, 16:07:03 UTC
Prior SEC filing: 18 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Leo Lee, by Michael A. Smith as Attorney-in-fact

Key filing fact

Leo Lee filed Form 4 for INSMED Inc (INSM) on 15 May 2026.

Key facts

This page summarizes Leo Lee's Form 4 filing for INSMED Inc (INSM).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 15 May 2026, 16:07.

Change

Previous filing in this sequence was filed on 18 Nov 2025.
Current net transaction value: $0.

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 0001740789 Primary reporting owner

LEE LEO

Relationship: Director
Address: 700 US HIGHWAY 202/206, BRIDGEWATER
Signature: /s/ Leo Lee, by Michael A. Smith as Attorney-in-fact
Signature date: 15 May 2026

Reported non-derivative transactions

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

INSM transaction

Common Stock

Award

Transaction value
Shares: +3,305
Change %: +6%
Price
Shares after: 57,971
Date: 13 May 2026
Ownership: Direct
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Represents Restricted Stock Units (RSUs), each representing a contingent right to receive one share of Common Stock. The RSUs vest in full on the first anniversary of the grant date (the Vesting Date), provided that the director (a) remains a member of the Board of Directors of the issuer until the earlier of (i) such Vesting Date and (ii) the Company's Annual Shareholder Meeting in the year of such Vesting Date, and (b) attends at least 75% of the meetings of the Board of Directors which take place between the grant date and the first anniversary of the grant date.

Footnote F2

Each RSU was granted on May 13, 2026, for no consideration.

Footnote F3

Due to a clerical error, this number was previously overstated by 11 shares. This value reflects the adjustment, decreasing the amount beneficially owned by 11 shares.