Penchant Family Holdings tied to Horizon Quantum (HQ) buys 84,602 shares

Rhea-AI Filing Summary

Horizon Quantum Holdings Ltd. reported an indirect insider purchase linked to its business combination closing. On March 19, 2026, Penchant Family Holdings LLC acquired 84,602 Class A Ordinary Shares at $11.82 per share, for an aggregate price of approximately $1,000,000. The shares are held by Penchant Family Holdings LLC, which is controlled by Penchant Holdings, Inc., where director Danielle Lambert serves as President, so her interest is through this affiliated entity rather than direct personal ownership.

Insider Trade Summary

Net Buyer: 84,602 shares ($999,996)

Net Buy 1 txn

Insider Lambert Danielle

Role Director

Bought 84,602 shs ($1000K)

Type	Security	Shares	Price	Value
Purchase	Class A Ordinary Shares	84,602	$11.82	$1000K

Holdings After Transaction: Class A Ordinary Shares — 84,602 shares (Indirect, Penchant Family Holdings LLC)

Footnotes (1)

1. On March 6, 2026, dMY Squared Technology Group, Inc. ("dMY"), the Company, and Horizon Quantum Computing Pte. Ltd. entered into a subscription agreement with Penchant Family Holdings LLC, whereby the Company, upon the closing of the Company's business combination with dMY, would issue 84,602 shares of the Company's Class A ordinary shares, with no par value (the "Class A Ordinary Shares") to Penchant Family Holdings LLC at a price per share of $11.82, for an aggregate purchase price of approximately $1,000,000. The closing of the Company's business combination occurred on March 19, 2026, and the 84,602 Class A Ordinary Shares of the Company were sold to Penchant Family Holdings LLC on that date. Penchant Family Holdings LLC is controlled by Penchant Holdings, Inc., its Managing Member, of which Danielle Lambert serves as its President.

Form 4 Insider Transactions: What Each Field Means →

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^*

Lambert Danielle

(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		10% Owner
	Officer (give title below)		Other (specify below)

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)
			Code	V	Amount	(A) or (D)	Price
Class A Ordinary Shares	03/19/2026(1)		P(1)		84,602	A	$11.82	84,602	I(2)	Penchant Family Holdings LLC(2)

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

Explanation of Responses:

1. On March 6, 2026, dMY Squared Technology Group, Inc. ("dMY"), the Company, and Horizon Quantum Computing Pte. Ltd. entered into a subscription agreement with Penchant Family Holdings LLC, whereby the Company, upon the closing of the Company's business combination with dMY, would issue 84,602 shares of the Company's Class A ordinary shares, with no par value (the "Class A Ordinary Shares") to Penchant Family Holdings LLC at a price per share of $11.82, for an aggregate purchase price of approximately $1,000,000. The closing of the Company's business combination occurred on March 19, 2026, and the 84,602 Class A Ordinary Shares of the Company were sold to Penchant Family Holdings LLC on that date.

2. Penchant Family Holdings LLC is controlled by Penchant Holdings, Inc., its Managing Member, of which Danielle Lambert serves as its President.

	/s/ Danielle Lambert	03/25/2026
	** 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)

FAQ

What insider transaction did Horizon Quantum (HQ) disclose in this Form 4?

Horizon Quantum disclosed an indirect insider purchase of 84,602 Class A Ordinary Shares. The shares were acquired by Penchant Family Holdings LLC at $11.82 per share, totaling about $1,000,000, in connection with the company’s business combination closing.

Who bought Horizon Quantum (HQ) shares and how is Danielle Lambert involved?

The shares were bought by Penchant Family Holdings LLC, which holds them indirectly. This LLC is controlled by Penchant Holdings, Inc., whose President is director Danielle Lambert, so her economic interest is via this affiliated entity rather than direct ownership.

How many Horizon Quantum (HQ) shares were purchased and at what price?

Penchant Family Holdings LLC acquired 84,602 Class A Ordinary Shares of Horizon Quantum at a price of $11.82 per share. This results in an aggregate purchase price of approximately $1,000,000 as disclosed in the Form 4 footnotes.

When did the Horizon Quantum (HQ) insider share purchase occur?

The purchase of 84,602 Class A Ordinary Shares by Penchant Family Holdings LLC closed on March 19, 2026. This date coincides with the closing of Horizon Quantum’s business combination with dMY Squared Technology Group, Inc., as described in the filing’s footnotes.

How is the Horizon Quantum (HQ) share purchase related to its business combination?

On March 6, 2026, a subscription agreement was signed to issue 84,602 shares to Penchant Family Holdings LLC at $11.82 per share. The transaction closed on March 19, 2026, simultaneously with Horizon Quantum’s business combination with dMY Squared Technology Group, Inc.

Is the Horizon Quantum (HQ) insider transaction a direct or indirect holding?

The Form 4 classifies the holding as indirect. The 84,602 Class A Ordinary Shares are owned by Penchant Family Holdings LLC, not by Danielle Lambert personally. Her connection is through her role as President of Penchant Holdings, Inc., the LLC’s managing member.