Summary
Updated Aug 30, 2026
David R. Brennan is Director of INSMED Inc (INSM). 4 SEC Form 4 filings on record going back to 2025, most recently on 15 May 2026.
Recent Transactions
5Every recent SEC Form 4 transaction David R. Brennan has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies David R. Brennan files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Roger Adsett - $47.51M of INSM open-market activity in the last 12 months
- Martina M.D. Flammer - $44.93M of INSM open-market activity in the last 12 months
- William Lewis - $26.07M of INSM open-market activity in the last 12 months
- Orlov S. Nicole Schaeffer - $16.95M of INSM open-market activity in the last 12 months
- Michael Alexander Smith - $16.94M of INSM open-market activity in the last 12 months
- Leo Lee - $14.69M of INSM open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is David R. Brennan?
David R. Brennan is a corporate insider, tracked as Director of INSMED Inc (INSM). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did David R. Brennan last file a Form 4?
The most recent primary Form 4 on record is dated 15 May 2026, one of 4 filings going back to 2025.
Where can I see all of David R. Brennan's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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