INSMED Director David R. Brennan Sells 25,000 Shares

What Happened David R. Brennan, a director of INSMED Inc. (INSM), reported a sale of 25,000 common shares on September 9, 2026. The shares were disposed at $124.00 each, for a total transaction value of $3,100,000. The Form 4 lists the transaction as an open-market or private sale (code S); sales are often routine and do not necessarily indicate a change in the insider’s view of the company.

Key Details

• Transaction date: 2026-09-09
• Price per share: $124.00
• Shares sold: 25,000
• Total value: $3,100,000
• Transaction type: Sale (open market or private sale), Form 4 accession 0001609305-26-000009
• Shares owned after transaction: Not specified in the summary provided; see the full Form 4 for post-transaction holdings
• Footnotes / plans: No 10b5-1 plan, tax withholding, or other footnotes disclosed in the details you provided
• Timeliness: Filed on 2026-09-11 — this appears to be a timely Form 4 filing (within the typical two-business-day window)

Context Sales by directors can be routine cash-management or diversification moves and do not by themselves signal company performance. Purchases generally carry more weight for interpreting insider conviction. For full context on holdings and any related disclosures (10b5-1 plans, option exercises, or multiple transactions), review the complete Form 4 filing available from the SEC.