SEC FORM 3

SEC FORM 3SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Chew Qian Yi Amanda

(Last)

(First)

(Middle)

C/O HORIZON QUANTUM HOLDINGS LTD.

29 MEDIA CIR. #05-22

(Street)

SINGAPORE

138565

(City)

(State)

(Zip)

SINGAPORE

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
07/28/2026

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

3a. Foreign Trading Symbol

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

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

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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)⁽¹⁾	⁽²⁾	03/01/2032	Class A Ordinary Shares	152,187⁽¹⁾	$0.8⁽¹⁾	D
Stock Option (Right to Buy)⁽³⁾	⁽⁴⁾	02/01/2035	Class A Ordinary Shares	152,187⁽³⁾	$7⁽³⁾	D

Explanation of Responses:

1. Each stock option is exercisable for approximately 2.435 Class A Ordinary Shares of Horizon Quantum Holdings Ltd. (the "Company") at a price per option of $0.80. In aggregate, Ms. Chew's stock options are exercisable for 152,187 Class A Ordinary Shares of the Company.

2. These stock options held by Ms. Chew are fully vested and exercisable.

3. Each stock option is exercisable for approximately 2.435 Class A Ordinary Shares of the Company at a price per option of $7.00. In aggregate, Ms. Chew's stock options, once fully vested, are exercisable for 152,187 Class A Ordinary Shares of the Company.

4. Ms. Chew was granted a total of 62,500 stock options exercisable for an aggregate of 152,187 Class A Ordinary Shares of the Company on February 1, 2025. 23,438 of Ms. Chew's stock options vested immediately upon grant and are currently exercisable. The remaining stock options are subject to Ms. Chew's continued employment with the Company and vest quarterly in ten equal installments of 3,906 stock options beginning on April 1, 2025. As of August 4, 2026, 46,875 stock options are fully vested and exercisable, with the remaining 15,625 stock options vesting in accordance with the forgoing schedule.

	/s/ Qian Yi Amanda Chew	08/10/2026
	** 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 5 (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 3: SEC 1473 (03-26)