ZSTKNasdaqFinance ServicesFiscal year ends December 31
ZeroStack Corp.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Jul 31, 2026
$3.89−0.11 (-2.75%)
Close on Oct 19, 2026
- Market cap
- $38.75K
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Who owns ZeroStack's shares
Held by institutions
–
Shares held, 13F filers
Institutional holders
–
Net institutional buying
–
Insider trades, 12 months
1 buys · 1 sales
Net bought $3.45M
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Empery Asset Management, LP | 926,361 | 5.36% | 13G (passive) | Dec 31, 2024 |
| Reis-Faria Daniel | 6,925,951 | 37.50% | 13D (active) amendment | Jul 20, 2026 |
| Heinrich Michael | 5,579,783 | 30.20% | 13D (active) amendment | Jul 20, 2026 |
| Starke Clifford | 3,850,886 | 17.10% | 13D (active) amendment | May 9, 2025 |
| Puple AI Inc. | 1,750,000 | 8.30% | 13G (passive) | Aug 19, 2026 |
| Blockcat Pte. Ltd. | 1,750,000 | 8.30% | 13G (passive) | Aug 19, 2026 |
| Ronald D. Schmeichel | 1,254,277 | 9.79% | 13G (passive) | Apr 22, 2024 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Michael Heinrich | Executive Chairman, Director | 4,608,575 | 26.35% | Jul 20, 2026 |
| Daniel Reis-Faria | CEO, Director | 5,954,743 | 34.05% | Jul 20, 2026 |
| Clifford Starke | CEO, Director | 2,246,902 | 12.85% | Jul 2, 2025 |
| Sammy Dorf | Executive Chairman, Director | 250,000 | 1.43% | Dec 17, 2024 |
| Rudy Rong | President | 0 | – | Aug 21, 2026 |
| Dany Vaiman | CFO | 170,850 | 0.98% | Jul 20, 2026 |
| Laurence Zeifman | Director | – | – | May 7, 2026 |
| Edward Woo | Director | 136,719 | 0.78% | May 7, 2026 |
| Manfred Leventhal | Director | – | – | May 7, 2026 |
| Michael John Brown | Director | – | – | Oct 23, 2025 |
| Harold Wolkin | Director | 10,000 | 0.06% | Jul 2, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Rudy Rong President | Aug 19, 2026 | Sale | −1,000 | $7.57 | $7.57K | 0 |
| Daniel Reis-Faria CEO, Director | Jul 20, 2026 | Option exercise | +5,954,743 | – | – | 5,954,743 |
| Michael Heinrich Executive Chairman, Director | Jul 20, 2026 | Buy | +4,608,575 | $0.75 | $3.46M | 4,608,575 |
| Sammy Dorf Executive Chairman, Director | Dec 15, 2024 | Award | +250,000 | – | – | 250,000 |
| Clifford Starke CEO, Director | Dec 15, 2024 | Award | +900,000 | – | – | 906,846 |
| Edward Woo Director | Dec 15, 2024 | Award | +50,000 | – | – | 134,698 |
| Clifford Starke CEO, Director | Sep 13, 2024 | Buy | +6,795 | $0.95 | $6.46K | 6,846 |
| Harold Wolkin Director | Sep 6, 2024 | Buy | +5,000 | $0.95 | $4.75K | 10,000 |
| Harold Wolkin Director | Sep 6, 2024 | Buy | +15,000 | $0.98 | $14.70K | 25,000 |
| Harold Wolkin Director | Sep 6, 2024 | Buy | +5,000 | $0.96 | $4.80K | 5,000 |
| Clifford Starke CEO, Director | Sep 5, 2024 | Buy | +51 | $0.95 | $48 | 474,046 |
| Clifford Starke CEO, Director | Apr 8, 2024 | Buy | +526,315 | $1.90 | $1,000.00K | 565,714 |
| Edward Woo Director | Nov 15, 2023 | Award | +74,512 | – | – | 84,698 |
| Kevin Taylor Chairman, Director | Nov 15, 2023 | Award | +124,186 | – | – | 124,186 |
| Dany Vaiman CFO | Nov 15, 2023 | Award | +149,024 | – | – | 170,850 |
| Clifford Starke CEO, Director | Nov 15, 2023 | Award | +327,851 | – | – | 473,995 |
| Thomas Solomon Director | Nov 15, 2023 | Award | +35,766 | – | – | 35,766 |
| Hussein Rakine Director | Jun 25, 2023 | Returned to company | −82,100 | – | – | 2,500 |
| Cohen, Matthew S. General Counsel | May 18, 2023 | Tax withholding | −90,146 | $0.24 | $21.64K | 329,610 |
| Hussein Rakine Chief Executive Officer, Director | Apr 16, 2023 | Award | +1,200,000 | – | – | 1,692,019 |
| John Timothy Leslie Director | Mar 17, 2023 | Award | +125,000 | – | – | 138,574 |
| Marc Mastronardi Director | Mar 17, 2023 | Award | +150,000 | – | – | 160,000 |
| Brandon Konigsberg Director | Mar 17, 2023 | Award | +100,000 | – | – | 100,000 |
| Juan Carlos Gomez Roa Director | Mar 17, 2023 | Award | +150,000 | – | – | 2,042,509 |
| Beverley Richardson Director | Mar 17, 2023 | Award | +150,000 | – | – | 150,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Luis Merchan Affiliate | May 22, 2023 | 500,000 | $130.00K | May 22, 2023 | Compensation |