ZeroStack Corp.
ZSTK- Exchange
- Nasdaq
- Industry
- Finance Services
- SEC CIK
- 0001790169
In the last 90 days, ZeroStack Corp. insiders filed 1 open-market purchase and 1 sale; 11 institutions reported holding it in 13F filings for Q2 2026, worth $183.8K in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by ZeroStack Corp. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 1 filing
- 1 insider, $3.48M in total
- Open-market sells
- 1 filing
- 1 insider, $7.57K in total
- Insiders trading
- 2
- Net value
- +$3.47M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for ZeroStack Corp., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Rong Rudy | President | 0 | Aug 21, 2026 | 1 |
| Heinrich Michael | Executive Chairman | 4,608,575Indirect | Jul 20, 2026 | 4 |
| Reis-Faria Daniel | CEO | 5,954,743 | Jul 20, 2026 | 3 |
| Vaiman Dany | CFO | 170,850 | Jul 20, 2026 | 2 |
| Zeifman Laurence | Director | – | May 7, 2026 | 1 |
| Woo Edward | Director | 134,698 | May 7, 2026 | 1 |
| Leventhal Manfred | Director | – | May 7, 2026 | 1 |
| Brown Michael John | Director | – | Oct 23, 2025 | 1 |
| Wolkin Harold | Director | 25,000 | Jul 2, 2025 | 0 |
| Starke Clifford | CEO | 906,846 | Jul 2, 2025 | 0 |
| Dorf Sammy | Executive Chairman | 250,000 | Dec 17, 2024 | 0 |
| Taylor Kevin | Chairman | 124,186 | Nov 15, 2023 | 0 |
| Solomon Thomas | Director | 35,766 | Nov 15, 2023 | 0 |
| Rakine Hussein | Director | 2,500 | Jun 27, 2023 | 0 |
| Cohen, Matthew S. | General Counsel | 329,610 | May 19, 2023 | 0 |
| Konigsberg Brandon | Director | 100,000 | Mar 21, 2023 | 0 |
| Roa Juan Carlos Gomez | Director | 2,042,509 | Mar 21, 2023 | 0 |
| Richardson Beverley | Director | 150,000 | Mar 21, 2023 | 0 |
| Mastronardi Marc | Director | 160,000 | Mar 21, 2023 | 0 |
| Leslie John Timothy | Director | 138,574 | Mar 21, 2023 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 21, 2026 (view filing)7:51 PM ET | Aug 19 | 2 days | Rong RudyPresident | SSale | −1.00K | $7.57 | −$7.57K | −100.0%0 after | |
| Jul 20, 2026 (view filing)6:31 PM ET | Jul 20 | Same day | Heinrich MichaelExecutive Chairman | PPurchase | +4.61M | $0.7549 | +$3.48M | New position4.61M after | |
| Oct 10, 2025 (view filing) | Oct 9 | 1 day | Reis-Faria DanielCEO | PPurchase | +5.95M | $25.19 | +$150.0M | –5.95M after | Derivative |
| Sep 17, 2024 (view filing) | Sep 13 | 4 days | Starke CliffordCEO | PPurchase | +6.79K | $0.95 | +$6.46K | +13,323.5%6.85K after | |
| Sep 11, 2024 (view filing) | Sep 6 | 5 daysLate | Wolkin HaroldDirector | PPurchase | +25.0K | $0.97 | +$24.3K | New position25.0K after | 3 lots |
| Sep 6, 2024 (view filing) | Sep 5 | 1 day | Starke CliffordCEO | PPurchase | +51 | $0.95 | +$48.45 | 0.0%474.0K after | |
| Apr 9, 2024 (view filing) | Apr 8 | 1 day | Starke CliffordCEO | PPurchase | +526.3K | $1.90 | +$1.00M | +1,335.9%565.7K after |