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.
Holders of 5% or more of ZSTK
Holders whose latest Schedule 13D or 13G filing reports 5% or more of ZeroStack Corp., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Reis-Faria Daniel | 13D/A | 88.30%6.43M shares | −1.00 ppfrom 89.30% | Oct 10, 20252 filings | Dec 23, 2025 | SEC |
| Heinrich Michael | 13D/A | 86.40%5.37M shares | −0.60 ppfrom 87.00% | Oct 27, 20252 filings | Dec 23, 2025 | SEC |
| Reis-Faria Daniel | 13D/A | 37.50%6.93M shares | – | Jul 21, 20261 filing | Jul 21, 2026 | SEC |
| Heinrich Michael | 13D/A | 30.20%5.58M shares | +20.20 ppfrom 10.00% | Apr 2, 20262 filings | Jul 21, 2026 | SEC |
| Vaiman Dany | 13D/A | 23.80%263.2K shares | +19.00 ppfrom 4.80% | Sep 12, 20244 filings | Dec 23, 2025 | SEC |
| Starke Clifford | 13D/A | 17.10%3.85M shares | – | Jan 6, 20237 filings | Jul 21, 2025 | SEC |
| Blockcat Pte. Ltd. | 13G | 8.30%1.75M shares | New | Sep 4, 20261 filing | Sep 4, 2026 | SEC |
| Puple AI Inc. | 13G | 8.30%1.75M shares | New | Sep 2, 20261 filing | Sep 2, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
29 Schedule 13D and 13G filings on ZeroStack Corp., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 4, 20263:06 PM ET | Blockcat Pte. Ltd. | 13G | 8.30%1.75M shares | New | Aug 19, 2026 | SEC |
| Sep 2, 20264:54 PM ET | Puple AI Inc. | 13G | 8.30%1.75M shares | New | Aug 19, 2026 | SEC |
| Jul 21, 20265:02 PM ET | Reis-Faria Daniel | 13D/A | 37.50%6.93M shares | – | Jul 20, 2026 | SEC |
| Jul 21, 20264:59 PM ET | Vaiman Dany | 13D/A | 2.90%513.2K shares | –Below 5% | Jul 20, 2026 | SEC |
| Jul 21, 20264:56 PM ET | Heinrich Michaeland 1 other | 13D/A | 30.20%5.58M shares | +20.20 ppfrom 10.00% | Jul 20, 2026 | SEC |
| Apr 2, 20268:05 PM ET | Heinrich Michaeland 1 other | 13D/A | 10.00%471.2K shares | – | Mar 31, 2026 | SEC |
| Dec 23, 202510:26 AM ET | Heinrich Michaeland 1 other | 13D/A | 86.40%5.37M shares | −0.60 ppfrom 87.00% | Dec 19, 2025 | SEC |
| Dec 23, 202510:17 AM ET | Vaiman Dany | 13D/A | 23.80%263.2K shares | +19.00 ppfrom 4.80% | Dec 19, 2025 | SEC |
| Dec 23, 202510:07 AM ET | Reis-Faria Daniel | 13D/A | 88.30%6.43M shares | −1.00 ppfrom 89.30% | Dec 19, 2025 | SEC |
| Oct 27, 20258:15 AM ET | Heinrich Michaeland 1 other | 13D | 87.00%4.90M shares | New | Oct 23, 2025 | SEC |
| Oct 10, 20251:23 PM ET | Reis-Faria Daniel | 13D | 89.30%5.95M shares | New | Oct 9, 2025 | SEC |
| Aug 14, 20254:07 PM ET | Highbridge Capital Management LLC | 13G/A | 4.40%1.04M shares | −0.70 ppfrom 5.10%Below 5% | Jun 30, 2025 | SEC |
| Jul 21, 20251:09 PM ET | Starke Clifford | 13D/A | 17.10%3.85M shares | – | May 9, 2025 | SEC |
| Jul 21, 202512:59 PM ET | Vaiman Dany | 13D/A | 4.80%1.08M shares | –Below 5% | May 9, 2025 | SEC |
| May 2, 20254:10 PM ET | Highbridge Capital Management LLC | 13G | 5.10%1.04M shares | New | Mar 31, 2025 | SEC |
| Apr 29, 20259:00 AM ET | Empery Asset Management, LPand 2 others | 13G/A | 1.92%374.1K shares | −3.44 ppfrom 5.36%Below 5% | Mar 31, 2025 | SEC |
| Jan 21, 20259:30 AM ET | Empery Asset Management, LPand 2 others | 13G | 5.36%926.4K shares | New | Dec 31, 2024 | SEC |
| Dec 17, 2024 | Starke Clifford | 13D/AOld format | – | – | – | SEC |
| Dec 17, 2024 | Vaiman Dany | 13D/AOld format | – | – | – | SEC |
| Nov 14, 2024 | Global X Management CO LLC | 13G/AOld format | – | – | – | SEC |
| Sep 12, 2024 | Vaiman Dany | 13DOld format | – | New | – | SEC |
| Sep 11, 2024 | Starke Clifford | 13D/AOld format | – | – | – | SEC |
| Jun 27, 2024 | RDS Private Capital II, LP | 13GOld format | – | New | – | SEC |
| Apr 15, 2024 | Starke Clifford | 13D/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Global X Management CO LLC | 13GOld format | – | – | – | SEC |
| Dec 8, 2023 | Global X Management CO LLC | 13GOld format | – | New | – | SEC |
| Nov 15, 2023 | Starke Clifford | 13D/AOld format | – | – | – | SEC |
| Apr 21, 2023 | Starke Clifford | 13D/AOld format | – | – | – | SEC |
| Jan 6, 2023 | Starke Clifford | 13DOld format | – | New | – | SEC |
Form 144: proposed insider sales
1 notice from officers, directors and other affiliates planning to sell ZeroStack Corp. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| May 22, 20234:01 PM ET | Merchan LuisAffiliate | 500.0K | $130.0K | May 22, 2023 | CHARLES SCHWAB CORPORATION | SEC |