Summary
Updated Aug 31, 2026
Sean A. McCarthy is CEO of CytomX Therapeutics, Inc. (CTMX). 4 SEC Form 4 filings on record going back to 2025, most recently on 19 March 2026. Most recent open-market trade: sold $764K of CTMX on 19 March 2026. Lifetime open-market sales: $1.23M.
Recent Transactions
3Every recent SEC Form 4 transaction Sean A. McCarthy has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Sean A. McCarthy go back to 2025: 4 primary Form 4 filings, an average of 2.0 per year. 2 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 Sean A. McCarthy 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.
- Marcia Belvin - $202K of CTMX open-market activity in the last 12 months
- Yu-Waye Chu - $137K of CTMX open-market activity in the last 12 months
- Christopher Ogden - $129K of CTMX 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 Sean A. McCarthy?
Sean A. McCarthy is a corporate insider, tracked as CEO of CytomX Therapeutics, Inc. (CTMX). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Sean A. McCarthy last file a Form 4?
The most recent primary Form 4 on record is dated 19 March 2026, one of 4 filings going back to 2025.
Has Sean A. McCarthy been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($1.23M) across all tracked filings.
Where can I see all of Sean A. McCarthy'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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