As of September 29, 2026, ZeroStack's top three insider holders are Daniel Reis-Faria (Ceo, 5.95Mn shares), Michael Heinrich (Executive Chairman, 4.61Mn shares), Juan Carlos Gomez Roa (Director, 34.04K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Daniel Reis-Faria | Ceo | 5,954,743 | 0 | 5,954,743 | 56.1% | 20 Jul, 2026 |
| 2 | Michael Heinrich | Executive Chairman | 0 | 4,608,575 | 4,608,575 | 43.4% | 20 Jul, 2026 |
| 3 | Juan Carlos Gomez Roa | Director | 34,041 | 0 | 34,041 | 0.3% | 21 Mar, 2023 |
| 4 | Marc Mastronardi | Director | 2,667 | 0 | 2,667 | 0.0% | 21 Mar, 2023 |
| 5 | Beverley Richardson | Director | 2,500 | 0 | 2,500 | 0.0% | 21 Mar, 2023 |
| 6 | John Timothy Leslie | Director | 2,310 | 0 | 2,310 | 0.0% | 21 Mar, 2023 |
| 7 | Brandon Konigsberg | Director | 1,667 | 0 | 1,667 | 0.0% | 21 Mar, 2023 |
| 8 | Clifford Starke | Ceo | 388 | 0 | 388 | 0.0% | 16 Dec, 2024 |
| 9 | Sammy Dorf | Executive Chairman | 107 | 0 | 107 | 0.0% | 16 Dec, 2024 |
| 10 | Dany Vaiman | Cfo | 73 | 0 | 73 | 0.0% | 15 Nov, 2023 |
| 11 | Edward Woo | Director | 58 | 0 | 58 | 0.0% | 16 Dec, 2024 |
| 12 | Kevin Taylor | Chairman | 53 | 0 | 53 | 0.0% | 14 Nov, 2023 |
| 13 | Thomas Solomon | Director | 15 | 0 | 15 | 0.0% | 15 Nov, 2023 |
| 14 | Harold Wolkin | Director | 11 | 0 | 11 | 0.0% | 11 Sep, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 19 Aug, 2026 | Rudy Rong | President | Disposed S | 1,000 | $7.57 | $7.57K | 0 | Direct |
| 20 Jul, 2026 | Michael Heinrich | Executive Chairman | Acquired P | 4,608,575 | $0.75 | $3.48Mn | 4,608,575 | Indirect |
| 20 Jul, 2026 | Daniel Reis-Faria | Ceo | Acquired X | 5,954,743 | $0.00 | $595 | 5,954,743 | Direct |
| 20 Jul, 2026 | Dany Vaiman | Cfo | Acquired A | 250,000 | $0.00 | $0 | 250,000 | Direct |
| 20 Jul, 2026 | Michael Heinrich | Executive Chairman | Acquired A | 500,000 | $0.00 | $0 | 500,000 | Direct |
| 20 Jul, 2026 | Daniel Reis-Faria | Ceo | Acquired A | 500,000 | $0.00 | $0 | 500,000 | Direct |
| 20 Jul, 2026 | Daniel Reis-Faria | Ceo | Disposed X | 5,954,743 | $25.19 | $150.00Mn | 0 | Direct |
| 05 May, 2026 | Laurence Zeifman | Director | Acquired A | 28,000 | $0.00 | $0 | 28,000 | Direct |
| 05 May, 2026 | Edward Woo | Director | Acquired A | 35,000 | $0.00 | $0 | 35,000 | Direct |
| 05 May, 2026 | Manfred Leventhal | Director | Acquired A | 35,000 | $0.00 | $0 | 35,000 | Direct |
| 31 Mar, 2026 | Michael Heinrich | Executive Chairman | Disposed J | 4,902,220 | — | — | 0 | Indirect |
| 19 Dec, 2025 | Daniel Reis-Faria | Ceo | Acquired A | 471,208 | $0.00 | $0 | 471,208 | Direct |
| 19 Dec, 2025 | Michael Heinrich | Executive Chairman | Acquired A | 471,208 | $0.00 | $0 | 471,208 | Direct |
| 19 Dec, 2025 | Dany Vaiman | Cfo | Acquired A | 235,604 | $0.00 | $0 | 235,604 | Direct |
| 23 Oct, 2025 | Michael Heinrich | Executive Chairman | Acquired X | 4,902,220 | — | — | 4,902,220 | Indirect |
| 22 Oct, 2025 | Michael John Brown | Director | Acquired A | 7,468 | $0.00 | $0 | 94,421 | Direct |
| 09 Oct, 2025 | Daniel Reis-Faria | Ceo | Acquired P | 5,954,743 | $25.19 | $150.00Mn | 5,954,743 | Direct |
| 30 Jun, 2025 | Manfred Leventhal | Director | Disposed D | 5,000 | — | — | 0 | Direct |
| 30 Jun, 2025 | Harold Wolkin | Director | Disposed D | 30,000 | — | — | 0 | Direct |
| 30 Jun, 2025 | Dany Vaiman | Cfo | Disposed D | 342,888 | — | — | 0 | Direct |