Danielle Lambert - 19 Mar 2026 Form 4 Insider Report for Horizon Quantum Holdings Ltd. (HQ)

Reporting relationship: Director
Issuer ticker: HQ
Reported as of: 19 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 25 Mar 2026, 19:01:28 UTC
Source filing: View source filing
Reporting owner signature: /s/ Danielle Lambert

Key filing fact

Danielle Lambert filed Form 4 for Horizon Quantum Holdings Ltd. (HQ) on 25 Mar 2026.

Key facts

This page summarizes Danielle Lambert's Form 4 filing for Horizon Quantum Holdings Ltd. (HQ).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 25 Mar 2026, 19:01.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002120146 Primary reporting owner

Lambert Danielle

Relationship: Director
Address: C/O HORIZON QUANTUM HOLDINGS LTD., 29 MEDIA CIR. #05-22, SINGAPORE, SINGAPORE
Signature: /s/ Danielle Lambert
Signature date: 25 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

HQ transaction

Class A Ordinary Shares

Purchase

Transaction value
Shares: +84,602
Change %
Price: $11.82^*
Shares after: 84,602
Date: 19 Mar 2026
Ownership: Penchant Family Holdings LLC
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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