Summary
Updated Aug 31, 2026
Jacquelyn L. Sumer is Chief Legal Officer of Cullinan Therapeutics, Inc. (CGEM). 6 SEC Form 4 filings on record going back to 2024, most recently on 2 July 2026. Most recent open-market trade: sold $52K of CGEM on 25 February 2026. Lifetime open-market sales: $176K.
Recent Transactions
5Every recent SEC Form 4 transaction Jacquelyn L. Sumer has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Jacquelyn L. Sumer go back to 2024: 6 primary Form 4 filings, an average of 2.0 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 Jacquelyn L. Sumer 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.
- Lynx1 Capital Management LP - $13.32M of CGEM open-market activity in the last 12 months
- Jennifer Michaelson - $1.44M of CGEM open-market activity in the last 12 months
- Nadim Ahmed - $518K of CGEM open-market activity in the last 12 months
- Jeffrey Alan Jones - $179K of CGEM open-market activity in the last 12 months
- Mary Kay Fenton - $60K of CGEM 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 Jacquelyn L. Sumer?
Jacquelyn L. Sumer is a corporate insider, tracked as Chief Legal Officer of Cullinan Therapeutics, Inc. (CGEM). InsiderAlpha holds 6 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 Jacquelyn L. Sumer submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Jacquelyn L. Sumer been buying or selling stock?
Recorded transactions: 0 open-market purchases and 4 open-market sales ($176K) across all tracked filings.
Where can I see all of Jacquelyn L. Sumer'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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