Summary
Updated Aug 30, 2026
Stuart J. Zimmer is Director, 10% Owner of Ategrity Specialty Insurance Co Holdings (ASIC). 3 SEC Form 4 filings on record, most recently on 1 October 2025. Most recent open-market trade: bought $97K of ASIC on 1 October 2025. Lifetime open-market purchases: $507K. Historical track record: 3/5 stars across 5 tracked purchases.
Recent Transactions
5Every recent SEC Form 4 transaction Stuart J. Zimmer has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Stuart J. Zimmer 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.
- Justin G. Cohen - $101K of ASIC open-market activity in the last 12 months
- Chris Schenk - $50K of ASIC 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 Stuart J. Zimmer?
Stuart J. Zimmer is a corporate insider, tracked as Director, 10% Owner of Ategrity Specialty Insurance Co Holdings (ASIC). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Stuart J. Zimmer last file a Form 4?
The most recent primary Form 4 on record is dated 1 October 2025, one of 3 filings going back to 2025.
Has Stuart J. Zimmer been buying or selling stock?
Recorded transactions: 5 open-market purchases ($507K) and 0 open-market sales across all tracked filings.
How accurate is Stuart J. Zimmer's historical track record?
Across 5 tracked purchases, Stuart J. Zimmer averaged +0.3% avg 30-day return with a 80% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
Where can I see all of Stuart J. Zimmer'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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