INSMED Inc 4

Insmed Inc. Chair and CEO William Lewis sold 7,605 shares of common stock at about $102.27 per share on June 3, 2026 to cover RSU-related tax obligations.

On June 3, 2026, Insmed Inc. Chair and CEO William Lewis sold 7,605 shares of Insmed common stock at an average price of approximately $102.27 per share, for proceeds of about $777,000, in a sale explicitly disclosed as being made to satisfy tax withholding obligations arising from the vesting of Restricted Stock Units and to cover related broker fees. Following this sale, Lewis directly owned 265,432 shares of Insmed common stock and also had an indirect beneficial ownership of 233,924 shares held by a trust, implying a total economic exposure of roughly $51 million based on the same price reference.

Filing Facts

CIK

1104506

Ticker

INSM

Form

4

Source Type

fda

Accession

0001402051-26-000032

Alert Tier

6