Bonstein Sara 4

What Happened
Sara Bonstein, Chief Financial Officer of Insmed Inc. (INSM), sold 748 shares of company stock on February 3, 2026 at $156.34 per share, for proceeds of approximately $116,942. The transaction is reported as a sale (open market or private sale) and the filing indicates the shares were disposed to cover tax withholding obligations tied to the vesting of restricted stock units.

Key Details

• Transaction date: 2026-02-03; Price: $156.34 per share; Shares sold: 748; Total value: $116,942.
• Reported reason (Footnote F1): Shares sold to satisfy tax withholding upon RSU vesting and to cover related broker fees.
• Transaction type code: S (Sale); sale listed as open market or private sale.
• Filing: Form 4 filed Feb 4, 2026 (Accession 0001604019-26-000006) — appears timely (Form 4 generally due within two business days).
• Shares owned after transaction: not specified in the provided excerpt.

Context
This was a sell-to-cover transaction related to RSU vesting (tax withholding), a common administrative sale that doesn't necessarily indicate a change in insider sentiment. For retail investors, purchases are generally more informative about insider confidence; routine tax withholding sales are standard and frequently occur when equity awards vest.