Flammer Martina M.D. 4

What Happened
Dr. Martina Flammer, Chief Medical Officer of Insmed, sold a total of 4,424 shares in two open‑market transactions. On 2026-06-03 she sold 2,566 shares at $102.27 for proceeds of $262,425, and on 2026-06-05 she sold 1,858 shares at $103.78 for proceeds of $192,823 — about $455,248 in total. These were sales (dispositions), not purchases.

Key Details

• Transaction dates and prices:
  • 2026-06-03: 2,566 shares @ $102.27 = $262,425
  • 2026-06-05: 1,858 shares @ $103.78 = $192,823
• Total shares sold: 4,424; total proceeds ≈ $455,248.
• Shares owned after the transactions: not specified in the provided filing summary.
• Footnotes:
  • Sale to satisfy tax withholding obligations upon the vesting of Restricted Stock Units (RSUs).
  • The 2026-06-05 sale was effected under a pre‑arranged Rule 10b5‑1 trading plan adopted Feb 27, 2025.
• Filing timeliness: Form 4 was filed on 2026-06-05 for a 2026-06-03 transaction — the filing appears timely (within the usual two‑business‑day window).

Context
Sales to cover tax withholding on RSU vesting are routine and do not necessarily reflect the insider’s view of the company’s prospects. A 10b5‑1 plan indicates the June 5 sale was pre‑arranged and automated under a compliance plan. For retail investors, purchases tend to carry more informational weight than these kinds of routine sales.