CFO option grant at Horizon Quantum (HQ) tied to merger exchange

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. reported that Chief Financial Officer Greg Gould received a grant of 285,300 stock options as part of the company’s recent business combination. Each option is exercisable into 2.43499 Class A Ordinary Shares, covering 694,702 shares in total, at an exercise price of $5.13 per share, and expires on August 15, 2035.

The award reflects an exchange of Mr. Gould’s prior Legacy Horizon options for equivalent company options at the March 19, 2026 business combination closing. The options vest quarterly in 16 equal installments beginning August 15, 2025; as of March 24, 2026, 35,662 options are vested and exercisable, with 249,638 scheduled to vest over time, contingent on continued employment.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Gould Greg

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	285,300	$0.00	--

Holdings After Transaction: Stock Option (Right to Buy) — 285,300 shares (Direct)

Footnotes (1)

1. Each stock option is exercisable for 2.43499 Class A Ordinary Shares of Horizon Quantum Holdings Ltd. (the "Company") at a price per share of $5.13. Stock options received as part of the business combination (the "Business Combination") contemplated by the Business Combination Agreement, dated as of September 9, 2025 (the "BCA"), by and among Horizon Quantum Computing Pte. Ltd. ("Legacy Horizon"), dMY Squared Technology Group, Inc., the Company and certain other parties, as described in the Registration Statement on Form F-4, as amended and supplemented (File No. 333-292737), initially filed with the U.S. Securities and Exchange Commission on January 14, 2026, and declared effective on February 17, 2026. Upon the closing of the Business Combination on March 19, 2026, Mr. Gould's stock options exercisable for Legacy Horizon ordinary shares awarded by Legacy Horizon were exchanged for substitute stock option awards of the Company of an equivalent economic value, which are subject to a vesting schedule as further detailed in footnote 3. The stock options held by Mr. Gould are subject to Mr. Gould's continued employment with the Company and vest quarterly in 16 equal installments, beginning on August 15, 2025. As of March 24, 2026, 35,662 stock options are fully vested and exercisable, with the remaining 249,638 stock options vesting in accordance with the forgoing schedule. Pursuant to the BCA and as a result of the closing of the Business Combination, Mr. Gould's 285,300 Legacy Horizon stock options were exchanged for 285,300 stock options of the Company of an equivalent economic value, with an exercise price per Class A Ordinary Share of $5.13.

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^*

Gould Greg

(Last) (First) (Middle)

C/O HORIZON QUANTUM HOLDINGS LTD.

29 MEDIA CIR. #05-22

(Street)

SINGAPORE 138565

(City) (State) (Zip)

SINGAPORE

(Country)

2. Issuer Name and Ticker or Trading Symbol
Horizon Quantum Holdings Ltd. [ HQ ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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
Stock Option (Right to Buy)	$5.13(1)	03/19/2026(2)		A		285,300(1)		(3)	08/15/2035	Class A Ordinary Shares	694,702(1)	(4)	285,300	D

Explanation of Responses:

1. Each stock option is exercisable for 2.43499 Class A Ordinary Shares of Horizon Quantum Holdings Ltd. (the "Company") at a price per share of $5.13.

2. Stock options received as part of the business combination (the "Business Combination") contemplated by the Business Combination Agreement, dated as of September 9, 2025 (the "BCA"), by and among Horizon Quantum Computing Pte. Ltd. ("Legacy Horizon"), dMY Squared Technology Group, Inc., the Company and certain other parties, as described in the Registration Statement on Form F-4, as amended and supplemented (File No. 333-292737), initially filed with the U.S. Securities and Exchange Commission on January 14, 2026, and declared effective on February 17, 2026. Upon the closing of the Business Combination on March 19, 2026, Mr. Gould's stock options exercisable for Legacy Horizon ordinary shares awarded by Legacy Horizon were exchanged for substitute stock option awards of the Company of an equivalent economic value, which are subject to a vesting schedule as further detailed in footnote 3.

3. The stock options held by Mr. Gould are subject to Mr. Gould's continued employment with the Company and vest quarterly in 16 equal installments, beginning on August 15, 2025. As of March 24, 2026, 35,662 stock options are fully vested and exercisable, with the remaining 249,638 stock options vesting in accordance with the forgoing schedule.

4. Pursuant to the BCA and as a result of the closing of the Business Combination, Mr. Gould's 285,300 Legacy Horizon stock options were exchanged for 285,300 stock options of the Company of an equivalent economic value, with an exercise price per Class A Ordinary Share of $5.13.

	/s/ Gregory Gould	03/25/2026
	** 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 insider transaction did Horizon Quantum (HQ) report for its CFO?

Horizon Quantum reported that CFO Greg Gould received 285,300 stock options as compensation. These options were granted in connection with the company’s business combination and replace his prior Legacy Horizon options on an equivalent economic basis.

How many Horizon Quantum (HQ) shares can the new CFO options cover?

Each option is exercisable into 2.43499 Class A Ordinary Shares, so 285,300 options together cover 694,702 shares. This structure links Mr. Gould’s potential upside directly to the future performance of Horizon Quantum’s Class A Ordinary Shares.

What is the exercise price and expiry for Greg Gould’s Horizon Quantum (HQ) options?

The options carry an exercise price of $5.13 per Class A Ordinary Share and expire on August 15, 2035. This long-dated structure is typical for equity incentives, giving management a multi‑year horizon to create shareholder value.

How do the Horizon Quantum (HQ) CFO options vest over time?

The options vest in 16 equal quarterly installments starting August 15, 2025, conditioned on continued employment. As of March 24, 2026, 35,662 options are vested and exercisable, while 249,638 remain unvested under the same quarterly schedule.

How is the Horizon Quantum (HQ) business combination related to this Form 4?

The Form 4 explains that Mr. Gould’s 285,300 Legacy Horizon options were exchanged at the March 19, 2026 business combination closing. They became Horizon Quantum options of equivalent economic value, preserving his prior equity incentives under the new corporate structure.

Is the Horizon Quantum (HQ) CFO transaction an open‑market share purchase or sale?

No. The filing describes a grant and exchange of stock options, not an open‑market trade. It is a compensation-related equity award tied to the business combination rather than a discretionary buy or sell of Horizon Quantum shares in the market.