Horizon Quantum grants 17,857 RSUs to CPO

Horizon Quantum’s Chief Product Officer received a 17,857-RSU equity award vesting quarterly over four years.

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. (symbol: HQ) is the issuer of record for a Form 4 filing submitted to the SEC. Chew Qian Yi Amanda reported acquisition or exercise transactions in this Form 4 filing.

Horizon Quantum Holdings Ltd. (HQ) reported that Chief Product Officer Chew Qian Yi Amanda received a grant of 17,857 Restricted Stock Units (RSUs) on August 17, 2026. Each RSU represents a contingent right to receive one Class A ordinary share of the company for no consideration upon vesting.

The 17,857 RSUs vest in sixteen approximately equal installments on successive quarterly anniversaries of the August 17, 2026 grant date, subject to Ms. Chew’s continued employment through each vesting date. Following this grant, she holds 17,857 RSUs directly.

Insider Trade Summary

Grant/Award: 17,857 shares

Grant/Award 1 txn

Insider Chew Qian Yi Amanda

Role Chief Product Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit F1, F2	17,857	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 17,857 contracts (Direct)

Footnotes (2)

1. F1. Each restricted stock unit ("RSU") represents a contingent right to receive one Class A ordinary share, with no par value ("Class A Ordinary Share"), of Horizon Quantum Holdings Ltd. (the "Company") upon vesting, for no consideration.
2. F2. On August 17, 2026 (the "Grant Date"), Ms. Chew was granted a total of unvested 17,857 RSUs. The RSUs granted to Ms. Chew vest in sixteen approximately equal installments on successive quarterly anniversaries of the Grant Date and are subject to Ms. Chew's continued employment with the Company through each applicable vesting date.

Key Figures

RSUs granted: 17,857 units Underlying Class A ordinary shares: 17,857 shares Vesting installments: 16 installments +2 more

5 metrics

RSUs granted 17,857 units Restricted Stock Units granted to Chief Product Officer on August 17, 2026

Underlying Class A ordinary shares 17,857 shares Each RSU represents one Class A ordinary share upon vesting

Vesting installments 16 installments RSUs vest in sixteen approximately equal quarterly installments

Vesting frequency Quarterly On successive quarterly anniversaries of the August 17, 2026 grant date

Shares held after transaction 17,857 RSUs Total RSUs directly held by the Chief Product Officer after the grant

Key Terms

Restricted Stock Unit, Class A ordinary share, contingent right, vesting, +1 more

5 terms

Restricted Stock Unit financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one Class A"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

Class A ordinary share financial

"receive one Class A ordinary share, with no par value ("Class A Ordinary Share")"

A Class A ordinary share is a type of common stock a company issues that carries a specific set of rights—most often particular voting power, dividend terms, or transfer rules—distinct from other share classes. For investors it matters because those rights affect control over company decisions, how income is paid out, and how easy shares are to buy or sell; think of it like a tiered ticket that gives different access and influence at the same event.

contingent right financial

"represents a contingent right to receive one Class A ordinary share"

vesting financial

"RSU represents a contingent right to receive one Class A ordinary share ... upon vesting"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

continued employment financial

"subject to Ms. Chew's continued employment with the Company through each applicable vesting date"

Continued employment means that an individual remains in their current job without interruption. For investors, it signals stability and ongoing work that can affect company performance and future prospects. Like a steady heartbeat for a business, sustained employment helps ensure consistent operations and financial health.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What equity award did Horizon Quantum (HQ) grant to its Chief Product Officer?

Horizon Quantum granted Chief Product Officer Chew Qian Yi Amanda 17,857 RSUs on August 17, 2026. Each RSU is a contingent right to receive one Class A ordinary share of the company for no consideration upon vesting.

How do the 17,857 RSUs granted by HQ vest for the Chief Product Officer?

The 17,857 RSUs vest in sixteen approximately equal installments on successive quarterly anniversaries of the August 17, 2026 grant date, and are subject to Ms. Chew’s continued employment with Horizon Quantum through each vesting date.

What does each RSU granted by Horizon Quantum (HQ) represent?

Each RSU represents a contingent right to receive one Class A ordinary share of Horizon Quantum Holdings Ltd. for no consideration, delivered when the unit vests according to the schedule described in the grant.

How many RSUs does the Chief Product Officer of HQ hold after this transaction?

After the August 17, 2026 grant, Chief Product Officer Chew Qian Yi Amanda holds 17,857 RSUs directly, as reported in the Form 4 filing for Horizon Quantum Holdings Ltd.

Was the RSU grant to HQ’s Chief Product Officer a market purchase or a grant?

The transaction is reported as a grant or award acquisition of 17,857 Restricted Stock Units, with a reported price of $0.00 per unit, meaning it is a compensation grant and not a market purchase.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/16/2026 - 06:05 AM Accepted by SEC EDGAR 09/16/2026 - 06:05 AM Learn about SEC filing dates

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^*

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. 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 Product Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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
Restricted Stock Unit	$0(1)	08/17/2026		A		17,857(1)		(1)	(2)	Class A Ordinary Shares	17,857(2)	$0(1)	17,857	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one Class A ordinary share, with no par value ("Class A Ordinary Share"), of Horizon Quantum Holdings Ltd. (the "Company") upon vesting, for no consideration.

2. On August 17, 2026 (the "Grant Date"), Ms. Chew was granted a total of unvested 17,857 RSUs. The RSUs granted to Ms. Chew vest in sixteen approximately equal installments on successive quarterly anniversaries of the Grant Date and are subject to Ms. Chew's continued employment with the Company through each applicable vesting date.

	/s/ Qian Yi Amanda Chew	09/16/2026
	** 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)