Form 4: INSMED Chief Legal Officer Sells Shares for Tax Obligations

INSMED's Chief Legal Officer, Michael Alexander Smith, sold common stock totaling 3,158 shares across three transactions in early January 2026 to cover tax withholding obligations and broker fees.

Summary

• Michael Alexander Smith, Chief Legal Officer of INSMED Inc., reported transactions involving the sale of common stock.
• These sales occurred on January 6, 7, and 8, 2026.
• A total of 3,158 shares of INSMED common stock were disposed of across these three dates.
• The purpose of these sales was to satisfy tax withholding obligations associated with the vesting of Restricted Stock Units and to cover related broker fees.
• The shares were sold at prices ranging from $173.33 to $175.07 per share.
• Following these transactions, Michael Alexander Smith beneficially owns 57,037 shares of INSMED common stock.

Sentiment

Score: 5

Explanation: Neutral, as the transaction is routine for tax purposes and not indicative of management's view on company performance.

Future Outlook

NA

Management Comments

• Shares were sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units and to cover related broker fees.

Industry Context

NA

Stakeholder Impact

• Shareholders: Minimal impact, as this is a routine, tax-related insider transaction and does not reflect a change in the company's operational fundamentals or management's confidence.

Key Dates

Recommendation

The reported transactions are routine sales by an insider to cover tax withholding obligations upon the vesting of Restricted Stock Units. Such transactions are common and generally do not reflect a change in management's outlook on the company's fundamentals or future prospects. Therefore, the filing itself does not provide a basis for altering an existing investment recommendation.

Keywords

INSMED, INSM, Form 4, insider trading, stock sale, Chief Legal Officer, Michael Alexander Smith, tax withholding, RSU vesting