Summary
Updated Aug 30, 2026
Michael Heinrich is Executive Chairman of ZeroStack Corp. (ZSTK). 4 SEC Form 4 filings on record going back to 2025, most recently on 20 July 2026. Most recent open-market trade: bought $3.48M of ZSTK on 20 July 2026. Lifetime open-market purchases: $3.48M.
Recent Transactions
1Every recent SEC Form 4 transaction Michael Heinrich has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Michael Heinrich go back to 2025: 4 primary Form 4 filings, an average of 2.0 per year. The typical open-market purchase is $3.48M (1 buy totaling $3.48M). The largest single buy on record is $3.48M of ZSTK in 2026. 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 Michael Heinrich 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.
- Daniel Reis-Faria - $150.00M of ZSTK open-market activity in the last 12 months
- Rudy Rong - $8K of ZSTK 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 Michael Heinrich?
Michael Heinrich is a corporate insider, tracked as Executive Chairman of ZeroStack Corp. (ZSTK). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Michael Heinrich submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Michael Heinrich been buying or selling stock?
Recorded transactions: 1 open-market purchase ($3.48M) and 0 open-market sales across all tracked filings.
Where can I see all of Michael Heinrich'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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