Insmed Inc. Corporate Controller Files Initial Form 3 Statement of Beneficial Ownership

Executive Summary

On November 3, 2026, INSMED Inc ($INSM) filed an initial statement of beneficial ownership of securities (Form 3) for Patrick Kevin Kane, who serves as the company's Corporate Controller. The report reflects beneficial ownership as of October 30, 2026.

Reported Holdings Breakdown

1. Non-Derivative Securities

• Common Stock: 9,921 shares owned directly.
• Restricted Stock Units (RSUs): Footnote disclosure indicates that the 9,921 common shares include:
  • 2,258 RSUs vesting 25% annually on each anniversary of grant through year four.
  • 5,246 RSUs vesting 25% on the first day of the first month following the first anniversary of the grant date, and 25% annually thereafter.

2. Derivative Securities (Stock Options)

Mr. Kane holds nine tranches of stock options (right to buy Common Stock) totaling 26,547 shares, all held directly:

• 2,580 options at $177.12 (Exp. Jan 2, 2036)
• 3,310 options at $67.22 (Exp. May 15, 2035)
• 2,430 options at $65.72 (Exp. Jan 8, 2035)
• 3,560 options at $25.83 (Exp. May 13, 2034)
• 3,180 options at $29.13 (Exp. Jan 4, 2034)
• 4,060 options at $18.95 (Exp. May 11, 2033)
• 3,870 options at $19.74 (Exp. Jan 5, 2033)
• 2,914 options at $17.07 (Exp. May 11, 2032; exercisable May 11, 2026)
• 643 options at $26.43 (Exp. Jan 6, 2032; exercisable Jan 6, 2026)

Market Impact & Significance

This filing represents standard baseline disclosure under Section 16(a) following an individual becoming subject to Section 16 reporting obligations. As there were no open-market purchases or sales, the trading significance is rated Low.