dMY Squared Sponsor, LLC - 19 Mar 2026 Form 4 Insider Report for dMY Squared Technology Group, Inc. (DMYY)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: DMYY
Reported as of: 19 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 Mar 2026, 16:20:21 UTC
Prior SEC filing: 17 Sep 2025
Source filing: View source filing
Reporting owner signature: /s/ Harry L. You, Name: Harry L. You, Title: Managing Member

Key filing fact

dMY Squared Sponsor, LLC filed Form 4 for dMY Squared Technology Group, Inc. (DMYY) on 20 Mar 2026.

Key facts

This page summarizes dMY Squared Sponsor, LLC's Form 4 filing for dMY Squared Technology Group, Inc. (DMYY).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 Mar 2026, 16:20.

Change

Previous filing in this sequence was filed on 17 Sep 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 (2)

CIK 0001915397 Primary reporting owner

dMY Squared Sponsor, LLC

Relationship: Director, 10%+ Owner
Address: C/O DMY SQUARED TECHNOLOGY GROUP, INC., 1180 NORTH TOWN CENTER DR, SUITE 100, LAS VEGAS
Signature: /s/ Harry L. You, Name: Harry L. You, Title: Managing Member
Signature date: 20 Mar 2026

CIK 0001432602

You Harry L.

Relationship: CEO, CFO & Chairman, Director, 10%+ Owner
Address: C/O DMY SQUARED TECHNOLOGY GROUP, INC., 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.

DMYY transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +1,163,484
Change %
Price
Shares after: 1,163,484
Date: 19 Mar 2026
Ownership: Direct
Footnotes: F2, F3

Reported derivative securities

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

DMYY transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -1,163,484
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 19 Mar 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 1,163,484
Exercise price
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

dMY Squared Sponsor, LLC is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 3 footnotes

Footnote F1

The shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), are convertible into shares of the issuer's Class A common stock, par value $0.0001 per share ("Class A Common Stock"), at the holder's election at any time and automatically at the time of the closing of the issuer's initial business combination, on a one-for-one basis, subject to adjustment pursuant to certain antidilution rights and have no expiration date.

Footnote F2

In connection with and immediately prior to the closing of the business combination ("Business Combination") between dMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and Horizon Quantum Holdings Ltd., all of the outstanding shares of Class B Common Stock were converted on a one-for-one basis into shares of Class A Common Stock in accordance with the issuer's Amended and Restated Articles of Organization.

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".