Bonstein Sara 4

What Happened

• Sara Bonstein, Chief Financial Officer of INSMED Inc. (INSM), reported the disposal of 2,404 shares on 2026-06-03. The shares were sold at $102.27 per share for a total of $245,857. The filing indicates the sale was to satisfy tax withholding obligations associated with the vesting of Restricted Stock Units (RSUs) and to cover related broker fees.

Key Details

• Transaction date: 2026-06-03
• Price per share: $102.27; Shares sold: 2,404; Gross value: $245,857
• Filing date: 2026-06-05 (filed within the typical 2-business-day Form 4 window)
• Footnote: F1 — shares sold to satisfy tax withholding on RSU vesting and to cover broker fees
• Shares owned after transaction: not specified in the provided filing

Context

• This was a sale to cover tax withholding on vested RSUs (a common, routine administrative sale) rather than an open-market sale motivated by a discretionary decision. Such tax-withholding sales are standard and do not necessarily indicate a change in the insider’s view of the company. Purchases or large discretionary sales typically carry more signal for investors than withholding sales.