ZeroStack Corp. (ZSTK) Insider Ownership

Historic Insider Ownership Trends

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Harold Wolkin - 25,000 0 11 Sep, 2024
Kevin Taylor Chairman 124,186 0 14 Nov, 2023
Brandon Konigsberg - 100,000 0 21 Mar, 2023
Juan Carlos Gomez Roa - 2,042,509 0 21 Mar, 2023
Beverley Richardson - 150,000 0 21 Mar, 2023
Dany Vaiman Cfo 170,850 0 15 Nov, 2023
Clifford Starke Ceo 906,846 0 16 Dec, 2024
Marc Mastronardi - 160,000 0 21 Mar, 2023
John Timothy Leslie - 138,574 0 21 Mar, 2023
Edward Woo - 134,698 0 16 Dec, 2024
Thomas Solomon - 35,766 0 15 Nov, 2023
Sammy Dorf Executive Chairman 250,000 0 16 Dec, 2024

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
31 Mar, 2026 Michael Heinrich Convertible Promissory Note D 4,902,220 - 0 I J
19 Dec, 2025 Dany Vaiman Employee Stock Option (Right to Buy) A 235,604 $0.00 235,604 D A
19 Dec, 2025 Daniel Reis-Faria Employee Stock Option (Right to Buy) A 471,208 $0.00 471,208 D A
19 Dec, 2025 Dany Vaiman Employee Stock Option (Right to Buy) A 235,604 $0.00 235,604 D A
19 Dec, 2025 Michael Heinrich Director Stock Option (Right to Buy) A 471,208 $0.00 471,208 D A
19 Dec, 2025 Daniel Reis-Faria Employee Stock Option (Right to Buy) A 471,208 $0.00 471,208 D A
23 Oct, 2025 Michael Heinrich Convertible Promissory Note A 4,902,220 - 4,902,220 I X
22 Oct, 2025 Michael John Brown Deferred Share Units (DSUs) A 7,468 $0.00 94,421 D A
09 Oct, 2025 Daniel Reis-Faria Pre-Funded Token Warrants A 5,954,743 $25.19 5,954,743 D P
09 Oct, 2025 Daniel Reis-Faria Pre-Funded Token Warrants A 5,954,743 $25.19 5,954,743 D P
30 Jun, 2025 Harold Wolkin Stock Appreciation Rights (SARs) D 30,000 - 0 D D
30 Jun, 2025 Clifford Starke Stock Appreciation Rights (SARs) D 1,028,665 - 0 D D
30 Jun, 2025 Manfred Leventhal Stock Appreciation Rights (SARs) D 5,000 - 0 D D
30 Jun, 2025 Harold Wolkin Stock Appreciation Rights (SARs) D 30,000 - 0 D D
30 Jun, 2025 Clifford Starke Stock Appreciation Rights (SARs) D 1,028,665 - 0 D D
30 Jun, 2025 Dany Vaiman Stock Appreciation Rights (SARs) D 342,888 - 0 D D
30 Jun, 2025 Manfred Leventhal Stock Appreciation Rights (SARs) D 5,000 - 0 D D
30 Jun, 2025 Dany Vaiman Stock Appreciation Rights (SARs) D 342,888 - 0 D D
30 Jun, 2025 Manfred Leventhal Stock Appreciation Rights (SARs) A 5,000 - 5,000 D A
30 Jun, 2025 Harold Wolkin Stock Appreciation Rights (SARs) A 30,000 - 30,000 D A