ZSTK insider trading — ZeroStack Corp.
Over the last 90 days, insiders at ZeroStack Corp. (ZSTK) made 1 open-market purchase worth $3.48M and 1 open-market sale worth $8K, making them net buyers by $3.47M. The largest purchase was by Heinrich Michael (Executive Chairman), who bought 4,608,575 shares for $3.48M on Jul 20, 2026. The largest sale was by Rong Rudy (President), who sold 1,000 shares for $8K on Aug 19, 2026.
Updated Oct 16, 2026.
Recent ZSTK insider transactions
Every Form 4 filed by ZeroStack Corp. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Aug 19, 2026 | Rong Rudy | President | S · Sale | Direct | 1,000 | $7.57 | $8K | Form 4 |
| Jul 20, 2026 | Heinrich Michael | Executive Chairman | P · Purchase | Indirect | 4,608,575 | $0.75 | $3.48M | Form 4 |
| Jul 20, 2026 | Reis-Faria Daniel | CEO | X · Option exercise | Direct | 5,954,743 | $0.00 | $595 | Form 4 |
ZSTK insider trading FAQ
Are insiders buying ZSTK stock?
Yes. In the last 90 days, ZeroStack Corp. insiders made 1 open-market purchase totaling $3.48M, and 1 open-market sale totaling $8K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading ZSTK?
Recent buyers: Heinrich Michael. Recent sellers: Rong Rudy.
Where does ZSTK insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.