Horizon Quantum grants 34,372 RSUs to officer

Horizon Quantum’s chief officer reported RSU grants, vesting into shares, and a partial cash-settled disposition back to the company.

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. (HQ) reported that officer Catherine Michele Fitzsimons had restricted stock unit (RSU) activity and a related share disposition. On June 12, 2026, she was granted 34,372 RSUs, each for one Class A ordinary share, vesting in approximately equal quarterly installments subject to continued employment. On September 12, 2026, 2,148 RSUs vested and were settled into the same number of Class A ordinary shares, and 1,122 underlying shares were returned to the company in a disposition reflecting cash settlement of a portion of the vested RSUs at a reference price of $15.22 per share. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

2,148 shares exercised/converted

Exercise 4 txns

Insider Fitzsimons Catherine Michele

Role CL and CO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F2, F1	2,148	$0.00	$0.00
Exercise	Class A Ordinary Shares F1, F2	2,148	$0.00	$0.00
Disposition	Class A Ordinary Shares F1, F3	1,122	$15.22	$17K
Grant/Award	Restricted Stock Unit F2	34,372	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 66,596 contracts (Direct); Class A Ordinary Shares — 1,026 shares (Direct)

Footnotes (3)

1. F1. On September 12, 2026, 2,148 of Ms. Fitzsimons's RSU's vested.
2. F2. On June 12, 2026 (the "Grant Date"), Ms. Fitzsimons was granted a total of 34,372 unvested restricted stock units ("RSUs"), each representing 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.. The RSUs granted to Ms. Fitzsimons vest in sixteen approximately equal installments on successive quarterly anniversaries of the Grant Date and are subject to Ms. Fitzsimons's continued employment with the Company through each applicable vesting date.
3. F3. The reported disposition to the Company reflects the settlement in cash of a portion of the RSUs which vested on September 12, 2026, at a price per ordinary share of $15.22, the last reported sales price of the Company's Class A Ordinary Shares on September 11, 2026.

Key Figures

RSUs granted: 34,372 units RSUs vested: 2,148 units Shares received on vesting: 2,148 shares +3 more

6 metrics

RSUs granted 34,372 units Unvested RSUs granted on June 12, 2026, each for one Class A ordinary share

RSUs vested 2,148 units RSUs that vested for Catherine Michele Fitzsimons on September 12, 2026

Shares received on vesting 2,148 shares Class A ordinary shares issued upon vesting of RSUs on September 12, 2026

Shares disposed to issuer 1,122 shares Underlying shares returned to Horizon Quantum in cash settlement of vested RSUs

Reference share price for cash settlement $15.22 per share Last reported sales price of Class A ordinary shares on September 11, 2026

RSU vesting schedule 16 installments RSUs vest in approximately equal installments on 16 successive quarterly anniversaries

Key Terms

restricted stock units, Class A ordinary share, vesting, disposition to the Company

4 terms

restricted stock units financial

"Ms. Fitzsimons was granted a total of 34,372 unvested restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Class A ordinary share financial

"each representing a contingent right to receive one 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.

vesting financial

"The RSUs granted to Ms. Fitzsimons vest in sixteen approximately equal installments"

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.

disposition to the Company financial

"The reported disposition to the Company reflects the settlement in cash"

FAQ

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

What insider transactions did HQ report for Catherine Michele Fitzsimons on this Form 4?

The filing reports RSU grants, vesting, and a disposition. RSUs granted on June 12, 2026 later vested on September 12, 2026 into Class A ordinary shares, and a portion of the vested award was settled in cash with underlying shares returned to Horizon Quantum Holdings Ltd.

How many restricted stock units did HQ grant to Catherine Michele Fitzsimons?

On June 12, 2026, Catherine Michele Fitzsimons was granted 34,372 unvested restricted stock units (RSUs), each representing a contingent right to receive one Class A ordinary share of Horizon Quantum Holdings Ltd., for no consideration, vesting in sixteen approximately equal quarterly installments.

How many HQ RSUs vested for Catherine Michele Fitzsimons and when?

On September 12, 2026, 2,148 RSUs vested for Catherine Michele Fitzsimons. Each vested RSU represented the right to receive one Class A ordinary share of Horizon Quantum Holdings Ltd. upon vesting, subject to the original grant’s continued employment conditions.

What was the nature of the share disposition reported by HQ for Catherine Michele Fitzsimons?

The Form 4 states that 1,122 Class A ordinary shares underlying vested RSUs were reported as a disposition to the company, reflecting settlement in cash of a portion of the RSUs that vested on September 12, 2026, rather than delivery of those shares.

At what price were a portion of Catherine Michele Fitzsimons’s HQ RSUs cash-settled?

The cash settlement of a portion of the vested RSUs used a reference price of $15.22 per ordinary share, described as the last reported sales price of Horizon Quantum Holdings Ltd.’s Class A ordinary shares on September 11, 2026.

Was a Rule 10b5-1 trading plan involved in Catherine Michele Fitzsimons’s HQ transactions?

No. The Form 4 indicates no Rule 10b5-1 plan was affirmed for these transactions, and the footnotes do not describe any pre-arranged trading or 10b5-1 plan governing the reported RSU vesting or disposition.

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

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Available on EDGAR 09/15/2026 - 09:33 PM Accepted by SEC EDGAR 09/15/2026 - 09:32 PM 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^*

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 ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/12/2026

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
Class A Ordinary Shares	09/12/2026(1)		M		2,148(1)	A	$0(2)	2,148	D
Class A Ordinary Shares	09/12/2026(1)		D		1,122(3)	D	$15.22(3)	1,026	D

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(2)	06/12/2026		A		34,372(2)		(2)	(2)	Class A Ordinary Shares	34,372(2)	$0	34,372	D
Restricted Stock Unit	$0(2)	09/12/2026		M		2,148(1)		(1)(2)	(2)	Class A Ordinary Shares	2,148	$0	32,224	D

Explanation of Responses:

1. On September 12, 2026, 2,148 of Ms. Fitzsimons's RSU's vested.

2. On June 12, 2026 (the "Grant Date"), Ms. Fitzsimons was granted a total of 34,372 unvested restricted stock units ("RSUs"), each representing 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.. The RSUs granted to Ms. Fitzsimons vest in sixteen approximately equal installments on successive quarterly anniversaries of the Grant Date and are subject to Ms. Fitzsimons's continued employment with the Company through each applicable vesting date.

3. The reported disposition to the Company reflects the settlement in cash of a portion of the RSUs which vested on September 12, 2026, at a price per ordinary share of $15.22, the last reported sales price of the Company's Class A Ordinary Shares on September 11, 2026.

	/s/ Catherine Michele Fitzsimons	09/15/2026
	** 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.
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* Form 4: SEC 1474 (03-26)