Summary
Updated Aug 30, 2026
William Lewis is Chair and CEO, Director of INSMED Inc (INSM). 32 SEC Form 4 filings on record going back to 2024, most recently on 24 July 2026. Most recent open-market trade: sold $625K of INSM on 24 July 2026. Lifetime open-market sales: $51.94M.
Recent Transactions
20Every recent SEC Form 4 transaction William Lewis has reported, most recent first.
Trading Pattern
InsiderAlpha's records for William Lewis go back to 2024: 32 primary Form 4 filings, an average of 10.7 per year. 121 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies William Lewis 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
- 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
- Elizabeth M. Anderson - $2.98M 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 William Lewis?
William Lewis is a corporate insider, tracked as Chair and CEO, Director of INSMED Inc (INSM). InsiderAlpha holds 32 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has William Lewis submitted recently?
5 primary Form 4 filings in the last 90 days, covering 1 company.
Has William Lewis been buying or selling stock?
Recorded transactions: 0 open-market purchases and 106 open-market sales ($51.94M) across all tracked filings.
Where can I see all of William Lewis'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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