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.
Key figures
- Insider buysLast 90 days, $3.48M in total
- 1
- Insider sellsLast 90 days, $7.57K in total
- 1
- 13F holdersQ2 2026, +1 vs. previous quarter
- 11
- 13F valueReported value at the end of Q2 2026
- $183.8K
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Superinvestors holding ZSTK, Q2 2026
No superinvestor reported holding ZSTK at the end of Q2 2026.
Latest insider trades
Open-market purchases and sales by ZeroStack Corp. insiders from Form 4, newest first.
| 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 |
Top 10 13F holders, Q2 2026
The largest institutional positions in ZeroStack Corp. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 25,440 | $76.3K | 0.00% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 20,994 | $63.0K | 0.00% | −4,327−17.1% | Reduced |
| Vanguard Fiduciary Trust Co | 12,648 | $37.9K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 1,730 | $5.19K | 0.00% | +1,730 | New |
| UBS Group AG | 440 | $1.32K | 0.00% | −226−33.9% | Reduced |
| Advisor Group Holdings, Inc. | 12 | $36 | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 7 | $21 | 0.00% | −166−96.0% | Reduced |
| Barclays PLC | 3 | $9 | 0.00% | +3 | New |
| Key Financial Inc | 1 | $3 | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 1 | $3 | 0.00% | +1 | New |