Horizon Quantum grants Fitzsimons 602K stock options

Each of the 16 approximately equal quarterly vesting installments is subject to the CLO and CCO's continued employment, beginning August 11, 2026.

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. granted 601,932 stock options to its CLO and CCO, Catherine Michele Fitzsimons, on June 11, 2026. Each option has a $10.78 exercise price and is exercisable for one Class A Ordinary Share. The options vest in 16 approximately equal quarterly installments over four years beginning August 11, 2026, subject to continued employment, and expire June 11, 2036. The footnote states that 37,620 options were fully vested and exercisable as of June 11, 2026.

Insider Trade Summary

Grant/Award: 601,932 shares

Grant/Award 1 txn

Insider Fitzsimons Catherine Michele

Role CLO and CCO

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy) F1, F2	601,932	$10.78	$6.49M

Holdings After Transaction: Stock Option (Right to Buy) — 601,932 contracts (Direct)

Footnotes (2)

1. F1. 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. F2. 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.

Key Figures

Stock options granted: 601,932 stock options Exercise price: $10.78 per option Fully vested and exercisable options: 37,620 options +2 more

5 metrics

Stock options granted 601,932 stock options Granted June 11, 2026

Exercise price $10.78 per option Each option is exercisable for one Class A Ordinary Share

Fully vested and exercisable options 37,620 options As of June 11, 2026

Vesting schedule 16 approximately equal quarterly installments over four years Beginning August 11, 2026; each installment subject to continued employment

Expiration date June 11, 2036 Ten years from the June 11, 2026 Grant Date

Key Terms

exercise price, quarterly installments, fully vested and exercisable, Class A Ordinary Shares

4 terms

exercise price financial

"Each stock option has an exercise price of $10.78"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

quarterly installments financial

"sixteen approximately equal quarterly installments over a four-year period"

fully vested and exercisable financial

"37,620 are fully vested and exercisable"

Class A Ordinary Shares financial

"exercisable for an aggregate of 601,932 Class A Ordinary Shares"

Class A ordinary shares are a type of ownership stake in a company that typically grants voting rights to shareholders, allowing them to have a say in important company decisions. They often come with priority in receiving dividends or profits, making them attractive to investors seeking influence and potential income. These shares help distinguish different levels of ownership and rights within a company's stock structure.

FAQ

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

How many stock options did HQ officer Catherine Michele Fitzsimons receive, and what is the exercise price?

Catherine Michele Fitzsimons received 601,932 stock options on June 11, 2026, each with a $10.78 exercise price. Each option is exercisable for one Class A Ordinary Share of Horizon Quantum Holdings Ltd.

How many of Catherine Michele Fitzsimons's HQ options were already vested?

Of the 601,932 options, 37,620 were fully vested and exercisable as of June 11, 2026.

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

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Available on EDGAR 10/21/2026 - 04:55 PM EDT Accepted by SEC EDGAR 10/21/2026 - 04:05 PM EDT 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)
	CLO and CCO

2a. Foreign Trading Symbol

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

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)	$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.
* 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)