SEC Filing - Horizon Quantum Holdings Ltd.

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SEC FORM 4SEC 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

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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^*

Fitzsimons Catherine Michele

(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 ]
Foreign Trading Symbol

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

	Director	10% Owner
	Officer (give title below)	Other (specify below)
CLO and CCO

3. Date of Earliest Transaction (Month/Day/Year)
06/11/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$10.78⁽¹⁾	06/11/2026⁽²⁾		A		601,932⁽²⁾		⁽²⁾	06/11/2036⁽²⁾	Class A Ordinary Shares	601,932⁽¹⁾	$10.78	601,932	D

Explanation of Responses:

1. Each stock option has an exercise price of $10.78 and is exercisable for one Class A Ordinary Share of Horizon Quantum Holdings Ltd. (the "Company"). Ms. Fitzsimons's stock options, once fully vested, will be exercisable for an aggregate of 601,932 Class A Ordinary Shares of the Company.

2. On June 11, 2026 (the "Grant Date"), Ms. Fitzsimons was granted a total of 601,932 unvested stock options. The unvested stock options granted to Ms. Fitzsimons vest in sixteen approximately equal quarterly installments over a four-year period beginning on August 11, 2026, with each vesting installment subject to Ms. Fitzsimons's continued employment with the Company. The unvested stock options expire ten years from the Grant Date, or June 11, 2036. Of the 601,932 unvested stock options granted to Ms. Fitzsimons, 37,620 are fully vested and exercisable as of the date hereof.

	/s/ Catherine Michele Fitzsimons	10/21/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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