ZeroStack (ZSTK) director receives 28,000 stock options at $5.10

Rhea-AI Filing Summary

ZeroStack Corp. director Laurence Zeifman reported a compensation-related award of options to buy 28,000 Common Shares. These director stock options have an exercise price of $5.10 per share and were granted at no cost.

The options vest in three equal installments: one-third on May 5, 2026, one-third on August 30, 2026, and one-third on December 31, 2026. Following this award, Zeifman holds 28,000 director stock options directly, with an expiration date of May 4, 2036.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Zeifman Laurence

Role null

Type	Security	Shares	Price	Value
Grant/Award	Director Stock Option ("Right to Buy")	28,000	$0.00	--

Holdings After Transaction: Director Stock Option ("Right to Buy") — 28,000 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Options granted: 28,000 options Exercise price: $5.10 per share Expiration date: May 4, 2036 +1 more

4 metrics

Options granted 28,000 options Director stock option grant on May 5, 2026

Exercise price $5.10 per share Exercise price for director stock options

Expiration date May 4, 2036 Option term for director grant

Post-grant option holdings 28,000 options Total derivative holdings following transaction

Key Terms

Director Stock Option, Grant, award, or other acquisition, exercise price, vest

4 terms

Director Stock Option financial

"security_title: "Director Stock Option ("Right to Buy")""

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

exercise price financial

"conversion_or_exercise_price: "5.1000""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vest financial

"The options vest as follows: 1/3 on May 5, 2026; 1/3 on August 30, 2026; and 1/3 on December 31, 2026."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Zeifman Laurence

(Last) (First) (Middle)

C/O ZEROSTACK CORP.

40 KING STREET WEST, SUITE 2400

(Street)

TORONTO M5H 3Y2

(City) (State) (Zip)

ONTARIO, CANADA

(Country)

2. Issuer Name and Ticker or Trading Symbol
ZeroStack Corp. [ ZSTK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/05/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Director Stock Option ("Right to Buy")	$5.1	05/05/2026		A		28,000		(1)	05/04/2036	Common Shares	28,000	$0	28,000	D

Explanation of Responses:

1. The options vest as follows: 1/3 on May 5, 2026; 1/3 on August 30, 2026; and 1/3 on December 31, 2026.

	/s/ Dany Vaiman as attorney-in-fact for Laurence Zeifman	05/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Laurence Zeifman report in this ZeroStack Corp. (ZSTK) Form 4?

Laurence Zeifman reported receiving a grant of director stock options for 28,000 Common Shares of ZeroStack Corp. This is a compensation-related award, not an open-market trade, and reflects options rather than immediate ownership of common shares.

How many ZeroStack (ZSTK) shares are covered by Zeifman’s new options?

The grant covers options to purchase 28,000 Common Shares of ZeroStack Corp. These are derivative securities that give Zeifman the right, but not the obligation, to buy that number of shares if he chooses to exercise the options.

What is the exercise price and term of Zeifman’s ZeroStack (ZSTK) options?

The options have an exercise price of $5.10 per share and expire on May 4, 2036. This means Zeifman can choose to buy ZeroStack common shares at $5.10 up until that expiration date, subject to the vesting schedule.

What is the vesting schedule for Laurence Zeifman’s ZeroStack (ZSTK) option grant?

The options vest in three equal tranches: 1/3 on May 5, 2026, 1/3 on August 30, 2026, and 1/3 on December 31, 2026. Vesting means those portions become exercisable on the respective dates.

Does this ZeroStack (ZSTK) Form 4 show any stock sales or purchases by Zeifman?

No stock sales or open-market purchases are reported. The Form 4 shows a grant/award acquisition of stock options, a compensation event, with no buy or sell transactions in common shares disclosed in this filing.

What are Zeifman’s reported holdings after this ZeroStack (ZSTK) option grant?

After the grant, the filing shows Zeifman directly holding 28,000 director stock options linked to an equal number of underlying common shares. No additional derivative positions are listed in the remaining-derivatives section of this Form 4.