Summary
Updated Aug 31, 2026
Stephen Mayo is Director of Allogene Therapeutics, Inc. (ALLO). 4 SEC Form 4 filings on record, most recently on 23 June 2026. Most recent open-market trade: sold $123K of SRPT on 14 March 2026. Lifetime open-market sales: $123K.
Recent Transactions
2Every recent SEC Form 4 transaction Stephen Mayo has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Stephen Mayo go back to 2026: 4 primary Form 4 filings, an average of 4.0 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 Stephen Mayo 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.
- Jennifer Zachary - $25.20M of MRK open-market activity in the last 12 months
- Richard R. Deluca - $11.29M of MRK open-market activity in the last 12 months
- Chirfi Guindo - $8.15M of MRK open-market activity in the last 12 months
- David Michael Williams - $8.13M of MRK open-market activity in the last 12 months
- Robert M. Davis - $5.60M of MRK open-market activity in the last 12 months
- Caroline Litchfield - $5.02M of MRK 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 Stephen Mayo?
Stephen Mayo is a corporate insider, tracked as Director of Allogene Therapeutics, Inc. (ALLO). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Stephen Mayo submitted recently?
3 primary Form 4 filings in the last 90 days, covering 3 companies.
Has Stephen Mayo been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($123K) across all tracked filings.
Where can I see all of Stephen Mayo'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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