Key facts
- This page summarizes Laurence Zeifman's Form 4 filing for ZeroStack Corp. (ZSTK).
- 1 reported transaction and 1 derivative row are listed below.
- Accepted by SEC: 07 May 2026, 09:30.
Laurence Zeifman - 05 May 2026 Form 4 Insider Report for ZeroStack Corp. (ZSTK)
- Reporting relationship
- Director
- Issuer ticker
- ZSTK
- Reported as of
- 05 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 07 May 2026, 09:30:48 UTC
- Prior SEC filing
- 15 Jan 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Dany Vaiman as attorney-in-fact for Laurence Zeifman
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Laurence Zeifman filed Form 4 for ZeroStack Corp. (ZSTK) on 07 May 2026.
Change
- Previous filing in this sequence was filed on 15 Jan 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001768912
Primary reporting owner
Zeifman Laurence
- Relationship
- Director
- Address
- C/O ZEROSTACK CORP., 40 KING STREET WEST, SUITE 2400, TORONTO, ONTARIO, CANADA
- Signature
- /s/ Dany Vaiman as attorney-in-fact for Laurence Zeifman
- Signature date
- 06 May 2026
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ZSTK
transaction
Derivative
Director Stock Option ("Right to Buy")
Award
- Transaction value
- Shares
- +28,000
- Change %
- Price
- $0.000000*
- Shares after
- 28,000
- Date
- 05 May 2026
- Ownership
- Direct
- Underlying class
- Common Shares
- Underlying amount
- 28,000
- Exercise price
- $5.10
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
The options vest as follows: 1/3 on May 5, 2026; 1/3 on August 30, 2026; and 1/3 on December 31, 2026.