Summary
Updated Aug 30, 2026
Charles Dadswell is EVP, General Counsel of MASIMO CORP (MASI). 3 SEC Form 4 filings on record going back to 2025, most recently on 12 June 2026.
Trading Pattern
InsiderAlpha's records for Charles Dadswell go back to 2025: 3 primary Form 4 filings, an average of 1.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Charles Dadswell 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.
- Anand Sampath - $2.56M of MASI 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 Charles Dadswell?
Charles Dadswell is a corporate insider, tracked as EVP, General Counsel of MASIMO CORP (MASI). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Charles Dadswell submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Where can I see all of Charles Dadswell'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.
Learn More
Follow Charles Dadswell and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial