Horizon Quantum (HQ) Chief Legal Officer files initial insider Form 3 disclosure

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. filed an initial insider ownership report for its Chief Legal Officer, Catherine Michele Fitzsimons. This Form 3 identifies her as an officer of the company but does not list any common stock or derivative security holdings or transactions.

Key Terms

Form 3, Chief Legal Officer, reporting person

3 terms

Form 3 regulatory

"Initial insider ownership report filed on SEC Form 3"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

Chief Legal Officer financial

"Catherine Michele Fitzsimons serves as Chief Legal Officer"

A chief legal officer is a senior executive responsible for overseeing a company's legal matters, ensuring that its activities comply with laws and regulations. They act like a company's legal guide, helping to prevent legal problems and manage risks. For investors, understanding this role is important because it reflects how well a company manages legal risks that could impact its stability and reputation.

reporting person regulatory

"Identifies Catherine Michele Fitzsimons as a reporting person"

Understanding Insider Trading Forms →

SEC 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

OMB APPROVAL

OMB Number:			3235-0104
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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. Date of Event Requiring Statement (Month/Day/Year)
05/11/2026

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 Legal 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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

No securities are beneficially owned.

	/s/ Catherine Fitzsimons	05/11/2026
	** 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)

FAQ

What does Horizon Quantum Holdings (HQ) Form 3 for Catherine Michele Fitzsimons report?

The Form 3 for Horizon Quantum Holdings’ Chief Legal Officer Catherine Michele Fitzsimons establishes her status as an officer and reporting person. It does not show any reported common stock or derivative security holdings or insider transactions at the time of this filing.

Did Catherine Michele Fitzsimons buy or sell HQ shares in this Form 3?

No insider purchases or sales are reported for Catherine Michele Fitzsimons in this Form 3. The filing is an initial ownership statement and shows no buy, sell, gift, or exercise transactions in Horizon Quantum Holdings securities at the reporting date.

Does the HQ Form 3 show any derivative securities for the Chief Legal Officer?

The Form 3 for Horizon Quantum Holdings’ Chief Legal Officer shows no derivative securities. The derivative summary is empty, and the transaction summary indicates zero derivative transactions, exercises, gifts, tax withholdings, or restructuring-related entries for this reporting person.

Why is a Form 3 filed for Horizon Quantum Holdings’ Chief Legal Officer?

A Form 3 is filed to identify an insider’s initial reporting status when they become subject to Section 16 reporting. For Horizon Quantum Holdings, it records Chief Legal Officer Catherine Michele Fitzsimons as a reporting person without disclosing any current holdings or transactions.

Does this HQ Form 3 indicate Catherine Michele Fitzsimons is a 10% owner?

No, the Form 3 indicates Catherine Michele Fitzsimons is not a ten percent owner of Horizon Quantum Holdings. The metadata flags her role as Chief Legal Officer only, with the ten percent owner field set to indicate she does not meet that ownership threshold.