Summary
Updated Aug 31, 2026
Mark J. Gergen is Executive Chairman of Poseida Therapeutics, Inc. (PSTX). 2 SEC Form 4 filings on record, most recently on 11 December 2024. Most recent open-market trade: sold $284K of PSTX on 11 December 2024. Lifetime open-market sales: $562K.
Recent Transactions
4Every recent SEC Form 4 transaction Mark J. Gergen has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Mark J. Gergen go back to 2024: 2 primary Form 4 filings, an average of 0.7 per year. 6 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Most Active Insiders Right Now
Mark J. Gergen has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- Jeffrey P. Bezos - $346.45M of AMZN open-market activity in the last 90 days
- SL SPV-2, L.P. - $341.29M of DELL open-market activity in the last 90 days
- Silver Lake Partners IV, L.P. - $319.53M of DELL open-market activity in the last 90 days
- BAKER BROS. ADVISORS LP - $317.75M of CELC open-market activity in the last 90 days
- Fairmount Funds Management LLC - $300.01M of ORKA open-market activity in the last 90 days
- Martine A. Rothblatt - $298.98M of UTHR open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Mark J. Gergen?
Mark J. Gergen is a corporate insider, tracked as Executive Chairman of Poseida Therapeutics, Inc. (PSTX). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Mark J. Gergen last file a Form 4?
The most recent primary Form 4 on record is dated 11 December 2024, one of 2 filings going back to 2024.
Has Mark J. Gergen been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($562K) across all tracked filings.
Where can I see all of Mark J. Gergen'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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