Smith Michael Alexander 4

What Happened
Michael Alexander Smith, Chief Legal Officer of INSMED Inc. (INSM), sold 640 shares in an open-market/private sale on 2026-02-03 at $156.27 per share, generating $100,013. This was a sale (not a purchase) and the filing indicates the shares were sold to satisfy tax withholding obligations upon RSU vesting.

Key Details

• Transaction date: 2026-02-03; Filing date: 2026-02-04 (timely filing).
• Action: Sale (transaction code S) of 640 shares at $156.27 each; gross proceeds reported as $100,013.
• Footnote: F1 — shares sold to satisfy tax withholding obligations on Restricted Stock Unit vesting and to cover related broker fees.
• Shares owned after the transaction: Not specified in the information provided in this summary.

Context
Tax-withholding sales tied to RSU vesting are routine and generally aimed at covering tax liabilities and fees; they do not necessarily indicate the insider's view on the company's prospects. The sale size (~$100k) is moderate for an executive-level tax withholding event.