Harry L. You - 19 Mar 2026 Form 4 Insider Report for Horizon Quantum Holdings Ltd. (HQ)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: HQ
Reported as of: 19 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 Mar 2026, 16:35:39 UTC
Prior SEC filing: 22 Dec 2025
Next SEC filing: 22 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Harry L. You

Key filing fact

Harry L. You filed Form 4 for Horizon Quantum Holdings Ltd. (HQ) on 20 Mar 2026.

Key facts

This page summarizes Harry L. You's Form 4 filing for Horizon Quantum Holdings Ltd. (HQ).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 Mar 2026, 16:35.

Change

Previous filing in this sequence was filed on 22 Dec 2025.
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 0001432602 Primary reporting owner

You Harry L.

Relationship: Director, 10%+ Owner
Address: 1180 NORTH TOWN CENTER DR, SUITE 100, LAS VEGAS
Signature: /s/ Harry L. You
Signature date: 20 Mar 2026

Reported non-derivative transactions

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

HQ transaction

Class A Ordinary Shares

Award

Transaction value
Shares: +1,163,484
Change %
Price
Shares after: 1,163,484
Date: 19 Mar 2026
Ownership: See footnote
Footnotes: F1, F3

HQ holding

Class A Ordinary Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 49,214
Date: 19 Mar 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

HQ transaction Derivative

Warrants

Award

Transaction value
Shares: +2,884,660
Change %
Price
Shares after: 2,884,660
Date: 19 Mar 2026
Ownership: See footnote
Underlying class: Class A Ordinary Shares
Underlying amount: 2,884,660
Exercise price: $11.50
Footnotes: F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

In connection with the closing of the business combination (the "Business Combination") among Horizon Quantum Holdings Ltd. (the "Issuer"), Horizon Quantum Computing Pte. Ltd. ("Horizon"), and dMY Squared Technology Group, Inc. ("DMY"), these Class A ordinary shares of the Issuer were issued pursuant to the terms of the Business Combination Agreement, dated as of September 9, 2025, by and among the Issuer, Horizon, and DMY (the "Business Combination Agreement") upon the exchange of 1,163,484 shares of Class A common stock of DMY. On the effective date of the Business Combination, the closing price of DMY's Class A common stock was $13.50.

Footnote F2

In connection with the closing of the Business Combination, these warrants of the Issuer were issued pursuant to the terms of the Business Combination Agreement upon the exchange of 2,884,660 warrants of DMY. On the effective date of the Business Combination, the closing price of DMY's warrants was $2.69.

Footnote F3

dMY Squared Sponsor, LLC (the "Sponsor") Sponsor is the record holder of the securities reported herein. Harry L. You is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held of record by the Sponsor. Each of the Sponsor and Mr. You is a "Reporting Person" and may be deemed to beneficially own the securities reported herein; however, each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. Solely for purposes of Section 16 of the Exchange Act, each Reporting Person may be deemed a "director by deputization".

SEC remarks

Due to the Issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Act, the Reporting Person's transactions in the Issuer's equity securities are exempt from Sections 16(b) and 16(c) of the Act.