Flammer Martina M.D. 4
4 · INSMED Inc · Filed May 15, 2026
Research Summary
AI-generated summary of this filing
INSMED (INSM) CMO Martina Flammer Sells 18,333 Shares
What Happened
- Martina Flammer, M.D., Chief Medical Officer of INSMED (INSM), sold a total of 18,333 shares in open-market transactions on May 13–14, 2026. The disposals broke down as:
- 4,470 shares on 2026-05-13 at a weighted average price of $112.76 (prices ranged $112.65–$112.85) — proceeds $504,037.
- 3,384 shares on 2026-05-13 at $116.18 — proceeds $393,153.
- 10,479 shares on 2026-05-14 at $117.54 — proceeds $1,231,702.
- Total shares sold: 18,333; total proceeds: $2,128,892. These were sales (not purchases) and appear routine.
Key Details
- Transaction dates/prices: May 13, 2026 (4,470 @ ~$112.76 and 3,384 @ $116.18) and May 14, 2026 (10,479 @ $117.54).
- Shares owned after the transactions: Not disclosed in this filing.
- Notable footnotes:
- F1: Shares were sold to satisfy tax withholding obligations upon RSU vesting and to cover broker fees.
- F2: The 4,470-share lot reflects a weighted average price; the filer can provide per-price breakdown on request.
- F3: The May 14 sale (10,479 shares) was effected pursuant to a Rule 10b5-1 trading plan adopted Feb 27, 2025.
- Filing/timeliness: Form 4 was filed May 15, 2026; the filing date is within the standard reporting window for these transactions.
Context
- These were sales to meet tax-withholding obligations tied to RSU vesting (and related fees), not an open expression of conviction via new purchases. The use of a 10b5-1 plan for the May 14 sale indicates that at least part of the selling was pre‑planned in accordance with SEC Rule 10b5-1.
Insider Transaction Report
Form 4
INSMED IncINSM
Flammer Martina M.D.
Chief Medical Officer
Transactions
- Sale
Common Stock
[F1][F2]2026-05-13$112.76/sh−4,470$504,037→ 78,773 total - Sale
Common Stock
[F1]2026-05-13$116.18/sh−3,384$393,153→ 75,389 total - Sale
Common Stock
[F3]2026-05-14$117.54/sh−10,479$1,231,702→ 64,910 total
Footnotes (3)
- [F1]Shares sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units and to cover related broker fees.
- [F2]This is the weighted average sales price representing 4,470 shares sold at prices ranging from $112.65 to $112.85 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.
- [F3]This transaction was effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on February 27, 2025 in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.
Signature
/s/ Martina Flammer, M.D., by Michael A. Smith as Attorney-in-fact|2026-05-15