Was the Horizon Quantum (HQ) CEO’s share acquisition an open-market purchase?

No, it was a grant related to a business combination. The transaction is coded as a grant, award, or other acquisition, with a $0.00 per share price, reflecting the exchange of Legacy Horizon shares when the business combination closed.

What agreement governed the Horizon Quantum (HQ) CEO’s share exchange?

The exchange occurred under a Business Combination Agreement. The filing cites the Business Combination Agreement dated September 9, 2025, among Legacy Horizon, dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd., and other parties, with a related Form F-4 registration statement.

Horizon Quantum (HQ) CEO receives 19.7M Class B shares in merger

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. reported that Chief Executive Officer and director Dr. Joseph Francis Fitzsimons acquired 19,744,585 Class B Ordinary Shares on March 19, 2026 at a stated price of $0.00 per share as a grant/award acquisition.

The footnotes explain that this occurred when the company completed its business combination under the Business Combination Agreement dated September 9, 2025. Dr. Fitzsimons exchanged 8,108,696 ordinary shares of Horizon Quantum Computing Pte. Ltd. for the 19,744,585 Class B Ordinary Shares.

Each Class B Ordinary Share is convertible at any time into one Class A Ordinary Share. Following this transaction, Dr. Fitzsimons directly holds 19,744,585 Class B Ordinary Shares, reflecting his continuing equity stake after the business combination.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Fitzsimons Joseph Francis

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Class B Ordinary Shares	19,744,585	$0.00	--

Holdings After Transaction: Class B Ordinary Shares — 19,744,585 shares (Direct)

Footnotes (1)

Each Class B ordinary share, with no par value (the "Class B Ordinary Shares"), is convertible, at any time, in exchange for one Class A ordinary share, with no par value (the "Class A Ordinary Shares"). Class B Ordinary Shares, received on March 19, 2026, upon the closing of business combination (the "Business Combination") contemplated by the Business Combination Agreement, dated as of September 9, 2025 (the "BCA"), by and among Horizon Quantum Computing Pte. Ltd. ("Legacy Horizon"), dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd. (the "Company") and certain other parties, as described in the Registration Statement on Form F-4, as amended and supplemented (File No. 333-292737), initially filed with the U.S. Securities and Exchange Commission on January 14, 2026, and declared effective on February 17, 2026. Pursuant to the BCA and as a result of the Business Combination, Dr. Fitzsimons exchanged his then outstanding 8,108,696 ordinary shares of Legacy Horizon for 19,744,585 Class B Ordinary Shares of the Company.

Form 4 Insider Transactions: What Each Field Means →

03/24/2026 - 06:30 PM

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 Joseph Francis

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Ordinary Shares⁽¹⁾	03/19/2026⁽²⁾		A		19,744,585	A	⁽³⁾	19,744,585	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Each Class B ordinary share, with no par value (the "Class B Ordinary Shares"), is convertible, at any time, in exchange for one Class A ordinary share, with no par value (the "Class A Ordinary Shares").

2. Class B Ordinary Shares, received on March 19, 2026, upon the closing of business combination (the "Business Combination") contemplated by the Business Combination Agreement, dated as of September 9, 2025 (the "BCA"), by and among Horizon Quantum Computing Pte. Ltd. ("Legacy Horizon"), dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd. (the "Company") and certain other parties, as described in the Registration Statement on Form F-4, as amended and supplemented (File No. 333-292737), initially filed with the U.S. Securities and Exchange Commission on January 14, 2026, and declared effective on February 17, 2026.

3. Pursuant to the BCA and as a result of the Business Combination, Dr. Fitzsimons exchanged his then outstanding 8,108,696 ordinary shares of Legacy Horizon for 19,744,585 Class B Ordinary Shares of the Company.

	/s/ Joseph Fitzsimons	03/24/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Horizon Quantum (HQ) disclose for its CEO?

Horizon Quantum’s CEO received 19,744,585 Class B Ordinary Shares. On March 19, 2026, Dr. Joseph Francis Fitzsimons was granted these shares at a stated price of $0.00 per share as part of the company’s completed business combination.

How did Dr. Fitzsimons’ Legacy Horizon stake convert in the Horizon Quantum (HQ) merger?

His Legacy Horizon shares were exchanged for new Horizon Quantum shares. Under the Business Combination Agreement, Dr. Fitzsimons exchanged 8,108,696 ordinary shares of Horizon Quantum Computing Pte. Ltd. for 19,744,585 Class B Ordinary Shares of Horizon Quantum Holdings Ltd.

What rights do Horizon Quantum (HQ) Class B Ordinary Shares have for the CEO?

Each Class B Ordinary Share is convertible into one Class A share. The filing states that every Class B Ordinary Share may be converted at any time into one Class A Ordinary Share, giving Dr. Fitzsimons flexibility over the form of his equity stake.

How many Horizon Quantum (HQ) Class B shares does the CEO hold after this Form 4?

Dr. Fitzsimons holds 19,744,585 Class B Ordinary Shares directly. The Form 4 shows this as his total direct ownership of Class B Ordinary Shares following the March 19, 2026 grant tied to the completed business combination.