ZeroStack Corp. (ZSTK) has 4 SEC Form 4 insider filings on record in the last 90 days. That includes 1 insider purchase totalling $3.5M, and 1 sales totalling $8K. Most recent filing: Aug. 21, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
|---|---|---|---|---|---|---|
| Aug. 21, 2026 filed Aug. 19, 2026 | Rong Rudy President | −$7,570 | 1,000 | −100% | No | |
|
|
||||||
| July 20, 2026 | Heinrich Michael Executive Chairman | +$3,479,013 | 5,108,575 | — | No | |
|
|
||||||
| July 20, 2026 | Reis-Faria Daniel CEO | $149,999,976 | 12,409,486 | — | No | |
|
|
||||||
| July 20, 2026 | Vaiman Dany CFO | $0 | 250,000 | 0% | No | |
|
|
||||||
Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
Start free