# EDGAR Filing Document

**Accession Number:** 0001915380
**File Stem:** 0001829126-26-002579
**Filing Date:** 2026-3
**Character Count:** 72500
**Document Hash:** 85a5286a6359390cd3c37328c99cb095
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001829126-26-002579.hdr.sgml**: 20260320

**ACCESSION NUMBER**: 0001829126-26-002579

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20260319

**ITEM INFORMATION**: Entry into a Material Definitive Agreement

**ITEM INFORMATION**: Completion of Acquisition or Disposition of Assets

**ITEM INFORMATION**: Changes in Control of Registrant

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260320

**DATE AS OF CHANGE**: 20260320

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** dMY Squared Technology Group, Inc.
- **CENTRAL INDEX KEY:** 0001915380
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 880748933
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41519
- **FILM NUMBER:** 26778416

**BUSINESS ADDRESS:**
- **STREET 1:** 1180 NORTH TOWN CENTER DRIVE SUITE 100
- **CITY:** LAS VEGAS
- **STATE:** NV
- **ZIP:** 89144
- **BUSINESS PHONE:** 408-232-2139

**MAIL ADDRESS:**
- **STREET 1:** 1180 NORTH TOWN CENTER DRIVE SUITE 100
- **CITY:** LAS VEGAS
- **STATE:** NV
- **ZIP:** 89144

?xml version='1.0' encoding='ASCII'?

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**PURSUANT TO SECTION 13 OR 15(d)**

**OF THE SECURITIES EXCHANGE ACT OF 1934**

Date of Report (Date of earliest event reported): **March 19, 2026**

**DMY SQUARED TECHNOLOGY GROUP, INC.** 

(Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Massachusetts** | **001-41519** | **88-0748933** |
| (State or other jurisdiction<br> of incorporation) | (Commission<br> File Number) | (IRS Employer<br> Identification No.) |

---

**1180 North Town Center Drive, Suite 100**

**Las Vegas, Nevada 89144**

(Address of principal executive offices, including zip code)

Registrant's telephone number, including area code: **(702** **) 781-4313**

**Not Applicable**

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which registered** |
| Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant | DMYYU | OTC Markets Group, Inc. |
| Class A common stock, par value $0.0001 per share | DMYY | OTC Markets Group, Inc. |
| Redeemable warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share | DMYYW | OTC Markets Group, Inc. |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

**INTRODUCTORY NOTE**

On March 19, 2026, dMY Squared Technology Group, Inc. (the "***Company***") consummated its previously announced business combination (the "***Business Combination***") pursuant to the terms of the business combination agreement (the "***Business Combination Agreement***"), dated as of September 9, 2025, with Horizon Quantum Computing Pte. Ltd. (Company Registration No.: 201802755E), a Singapore private company limited by shares ("***Horizon***"), Horizon Quantum Holdings Ltd. (formerly known as Horizon Quantum Holdings Pte. Ltd and Rose Holdco Pte. Ltd.) (Company Registration No.: 202537774K), a Singapore public company limited by shares ("***Holdco***"), Rose Acquisition Pte. Ltd. (Company Registration No. 202537790M), a Singapore private company limited by shares and wholly-owned subsidiary of Horizon ("***Merger Sub 1***"), and Horizon Merger Sub 2, Inc., a Massachusetts corporation and wholly-owned subsidiary of Horizon ("***Merger Sub 2***").

Pursuant to the Business Combination Agreement, (i) Holdco converted from a Singapore private company to a Singapore public company, (ii) Horizon and Merger Sub 1 amalgamated, with Horizon surviving as a wholly-owned subsidiary of Holdco and (iii) Merger Sub 2 merged with and into the Company with the Company surviving as a wholly-owned subsidiary of Holdco.

As a result of the Business Combination, Holdco's Class A ordinary shares and warrants began trading on The Nasdaq Stock Market LLC ("***Nasdaq***") under the ticker symbols "HQ" and "HQWWW," respectively, on March 20, 2026.

Capitalized terms used but not otherwise defined in this Current Report on Form 8-K have the meaning set forth in the Business Combination Agreement. The description of the Business Combination Agreement and related transactions (including, without limitation, the Business Combination) in this Current Report on Form 8-K does not purport to be complete and is subject, and qualified in its entirety by reference to, the full text of the Business Combination Agreement, which is attached as <u>Annex A</u> to the definitive proxy statement on Schedule 14A filed by the Company with the U.S. Securities and Exchange Commission (the "***SEC***") on February 17, 2026, as amended by Amendment No. 1 thereto, filed by the Company with the SEC on March 6, 2026 (collectively, the "***Proxy Statement***").

**Item 1.01. Entry into a Material Definitive Agreement**

The information set forth the Introductory Note of this Current Report on Form 8-K is incorporated herein by reference in its entirety.

In connection with the Closing, the Company, Holdco, and Continental Stock Transfer & Trust Company, as warrant agent (the "***Warrant Agent***"), entered into a warrant assignment, assumption and amendment agreement (the "***Warrant Assumption Agreement***"), pursuant to which, among other things, the Company assigned to Holdco all of the Company's right, title and interest in and to, and Holdco will assume all of the Company's liabilities and obligations under the certain Warrant Agreement, dated as of October 4, 2022, between the Company and the Warrant Agent (the "***Existing Warrant Agreement***"). As a result, each warrant of the Company automatically ceased to represent a right to acquire shares of the Company's Class A common stock and instead represents a right to acquire Holdco's Class A ordinary shares pursuant to the terms and conditions of the Existing Warrant Agreement (as amended by the Warrant Assumption Agreement).

*The foregoing description of the Warrant Assumption Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Warrant Assumption Agreement, a copy of which is included as Exhibit 4.1 to this Current Report on Form 8-K and is incorporated herein by reference.*

**Item 2.01. Completion of Acquisition or Disposition of Assets.**

The information set forth the Introductory Note of this Current Report on Form 8-K is incorporated herein by reference in its entirety.

As previously disclosed, in connection with the special meeting of the Company's stockholders, which special meeting was held on March 17, 2026 (the "***Special Meeting***"), the public stockholders of the Company had the right to elect to redeem all or a portion of their SPAC Public Shares for a per share price calculated in accordance with the amended and restated certificate of incorporation of the Company as of the Closing. 1,403,777 SPAC Public Shares were redeemed in connection with the Business Combination, at a per share price of approximately $11.82, for an aggregate redemption payment of approximately $16.47 million.

All of the required Form 10 information with respect to the Business Combination will be disclosed by Holdco on Form 20-F, to be filed with the SEC.

**Item 5.01. Changes in Control of Registrant.**

The information set forth the Introductory Note of this Current Report on Form 8-K is incorporated herein by reference in its entirety.

At the time of the SPAC Merger and as a result of the Business Combination, a change in control of the Company occurred and the Company became a wholly-owned subsidiary of Holdco.

**Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

The information set forth the Introductory Note of this Current Report on Form 8-K is incorporated herein by reference in its entirety.

In connection with the consummation of the Business Combination, each of Darla Anderson, Francesa Luthi, Constance Weaver and Harry You ceased to be director and/or officers of the Company.

Following the consummation of the Business Combination, Joseph Fitzimons, Danielle Lambert, Jill Turner, and Harry You were appointed to serve as directors of Horizon, and the board of directors of Horizon appointed the following officers: Joseph Fitzimons as Chief Executive Officer, Si-Hui Tan as Chief Science Officer, and Greg Gould as Chief Financial Officer.

**Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.**

The information set forth the Introductory Note of this Current Report on Form 8-K is incorporated herein by reference in its entirety.

In connection with the consummation of the Business Combination, the Company adopted a second amended and restated articles of organization ("***Second Amended and Restated Articles of Organization***") which is substantially in the form as described in the Proxy Statement, in accordance with the Company becoming a wholly-owned subsidiary of Holdco in connection with the Business Combination.

*A copy of the Second Amended and Restated Articles of Organization is attached as Exhibit 3.1 hereto and incorporated herein by reference.*

**Item 9.01 Financial Statements and Exhibits.**

(d) Exhibits.

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 3.1 | [Second Amended and Restated Articles of Organization.](dmysquared_ex3-1.htm) |
| 4.1 | [Warrant Assumption Agreement, dated as of March 19, 2026, by and among dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd. and Continental Stock Transfer & Trust Company.](dmysquared_ex4-1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **DMY SQUARED TECHNOLOGY GROUP, INC.** | **DMY SQUARED TECHNOLOGY GROUP, INC.** |
| Date: March 20, 2026 | By: | /s/ Harry L. You |
|  | Name: | Harry L. You |
|  | Title: | Chief Executive Officer, Chief Financial Officer and Chairman |

---

## Exhibit 3.1

**Exhibit 3.1**

**The Commonwealth of Massachusetts**

**William Francis Galvin**

Secretary of the Commonwealth

One Ashburton Place, Boston, Massachusetts 02108-1512

**SECOND AMENDED AND RESTATED ARTICLES OF ORGANIZATION**

**(General Laws Chapter 156D, Section 2.02; 950 CMR 113.16)**

(1) Exact name of corporation: dMY Squared Technology Group, Inc.

(2) Registered office address: <u>44 School Street, Suite 505, Boston, Commonwealth of Massachusetts 02108</u> <br> *(number, street, city or town, state, zip code)*

(3) Date adopted: <u>March 19, 2026</u> <br> *(month, day, year)*

(4) Approved by: <br> *(check appropriate box)*

☐ the directors without shareholder approval and shareholder approval was not required;

OR

☑ the board of directors and the shareholders in the manner required by G.L. Chapter 156D and the corporation's articles of organization.

(5) The following information is required to be included in the articles of organization pursuant to G.L. Chapter 156D, Section 2.02 except that the supplemental information provided for in Article VIII is not required:

**Article I – Name**

The exact name of the corporation is: Horizon Quantum, Inc. (the "**Corporation**")

**Article II – Purpose**

The purpose for which the Corporation is formed is for the transaction of any and all lawful business for which a business corporation may engage in under the Massachusetts Business Corporation Act (M.G.L. Ch. 156D, Sec. 101 et seq., as amended and in effect from time to time, the "**MBCA**").

**Article III – Authorized Shares**

The following is the total number of shares and par value of each class of stock that the Corporation is authorized to issue. The number of authorized shares of any class or classes of stock may be increased or decreased (but not below the number of shares thereof then outstanding or reserved for issuance in each class) by the affirmative vote of the holders of at least a majority of the voting power of the issued and outstanding shares of capital stock entitled to vote thereon, voting together as a single class.

---

| | | | | |
|:---|:---|:---|:---|:---|
| **WITHOUT PAR VALUE** | **WITHOUT PAR VALUE** | **WITH PAR VALUE** | **WITH PAR VALUE** | **WITH PAR VALUE** |
| **TYPE** | **NUMBER<br> OF SHARES** | **TYPE** | **NUMBER<br> OF SHARES** | **PAR<br> VALUE** |
|  |  | Common | 10000 | $0.0001 |
|  |  | Preferred | 500 | $0.0001 |

---

**Article IV – Preferences, Limitations and Rights of Any Class or Series**

The total number of shares of all classes of capital stock, each with a par value of $0.0001 per share, which the Corporation is authorized to issue is 10,500 shares, consisting of (a) 10,000 shares of common stock (the "**Common Stock**"), and (ii) 500 shares of preferred stock (the "**Preferred Stock**").

**A. Common Stock**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. <u>Voting in General</u>. Unless and until the Corporation has issued shares of Preferred Stock having the right to vote in the election of directors of the Corporation ("**Directors**") and other matters requiring action by the Corporation's shareholders, or as otherwise provided in these Second Amended and Restated Articles of Organization (as amended and/or restated from time to time, these "**Articles**") or required by applicable law, the holders of shares of Common Stock (the "**Common Stock**") shall at all times vote together as one class on all matters (including the election of directors) submitted to a vote or for the consent of the shareholders of the Corporation. There shall be no cumulative voting.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. <u>Liquidation, Dissolution or Winding Up</u>. Upon any voluntary or involuntary liquidation, dissolution or winding up of the Corporation, the holders of shares of Common Stock shall be entitled to share equally, on a per share basis, in the net assets of the Corporation, after the Corporation shall have satisfied or made provision for the satisfaction of its debts and obligations and for the payment to holders of shares of any class or series of capital stock of the Corporation having preferential rights to receive distributions of the Corporation's net assets.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. <u>Merger or Consolidation</u>. In the case of any distribution or payment in respect of the shares of Common Stock upon the consolidation or merger of the Corporation with or into any other entity, or in the case of any other transaction having an effect on shareholders substantially similar to that resulting from a consolidation or merger, such distribution or payment that the holders of shares of Common Stock have the right to receive, or the right to elect to receive, shall be made ratably on a per share basis among the holders of the Common Stock.

**B. Preferred Stock**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Corporation's Board of Directors (the "**Board**") shall be authorized, without further shareholder approval and subject to any limitations prescribed by applicable law, to provide for the issuance of shares of Preferred Stock in such class or series as may be determined by the Board by filing Articles of Amendment or Restated Articles of Organization pursuant to the law of the Commonwealth of Massachusetts, to establish from time to time the number of shares to be included in each such class or series, and to fix the designation, powers, preferences and rights of the shares of each such class or series and any qualifications, limitations or restrictions thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the Common Stock, without a vote of the holders of the Preferred Stock, or of any class or series thereof, unless a vote of any such holders is required pursuant to the terms of any Preferred Stock provided in any such Articles of Amendment or Restated Articles of Organization. In case the number of shares of any class or series shall be so decreased, the shares constituting such decrease shall resume the status that they had prior to the adoption of the resolution originally fixing the number of shares of such class or series.

**C. Rights and Options**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Corporation has the authority to create and issue rights, warrants and options entitling the holders thereof to acquire from the Corporation any shares of its capital stock of any class or classes, with such rights, warrants and options to be evidenced by or in instrument(s) approved by the Board. The Board is empowered to set the exercise price, duration, times for exercise and other terms and conditions of such rights, warrants or options; provided, however, that the consideration to be received for any shares of capital stock issuable upon exercise thereof may not be less than the par value thereof.

**D. Approval by Shareholders of Certain Actions**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. <u>Voluntary Dissolution of the Corporation</u>. Unless a greater percentage vote, or action by one or more separate voting groups, is required by the Articles, by the Bylaws of the Corporation (the "**Bylaws**"), by the provisions of the MBCA, or by the Board acting pursuant to subsection (c) of Section 14.02 of the MBCA, the approval of a proposal to dissolve the Corporation in accordance with Section 14.02 of the MBCA shall require the affirmative vote of at least a majority of all shares entitled generally to vote on such matter by the Articles, and in addition, a majority of the shares of any voting group entitled to vote separately on the matter pursuant to the MBCA, by the Articles or by the Bylaws, or by action of the Board taken pursuant to Subsection (c) of Section 14.02 of the MBCA.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. <u>Domestication into Foreign Jurisdiction</u>. Unless a greater percentage vote, or action by one or more separate voting groups, is required by the Articles, by the Bylaws, by the provisions of the MBCA, or by the Board acting pursuant to subsection (3) of Section 9.21 of the MBCA, the approval of a plan of domestication of the Corporation to a foreign jurisdiction in accordance with Section 9.21 of the MBCA shall require the affirmative vote of at least a majority of all shares entitled generally to vote on such matter by these Articles, and in addition, a majority of the shares of any voting group entitled to vote separately on the matter pursuant to the MBCA, by the Articles or by the Bylaws, or by action of the Board taken pursuant to Subsection (3) of Section 9.21 of the MBCA.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. <u>Entity Conversion</u>. Unless a greater percentage vote, or action by one or more separate voting groups, is required by the Articles, by the Bylaws, by the provisions of the MBCA, or by the Board acting pursuant to subsection (3) of Section 9.52 of the MBCA, the approval of a plan of entity conversion to a domestic or foreign other entity in accordance with Section 9.52 of the MBCA shall require the affirmative vote of at least a majority of all shares entitled generally to vote on such matter by the Articles, and in addition, a majority of the shares of any voting group entitled to vote separately on the matter pursuant to the MBCA, by the Articles or by the Bylaws, or by action of the Board taken pursuant to Subsection (3) of Section 9.52 of the MBCA.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. <u>Choice of Forum</u>. Unless the Corporation consents in writing to the selection of an alternative forum, the Business Litigation Session of the Superior Court for Suffolk County, Massachusetts and United States District Court for the District of Massachusetts sitting in Boston, Massachusetts shall be the sole and exclusive forum for (a) any derivative action or proceeding brought on behalf of the Corporation, (b) any action asserting a claim for breach of a fiduciary duty owed by any director, officer, employee, or agent of the Corporation to the Corporation or the Corporation's shareholders, (c) any action asserting a claim arising pursuant to any provision of the Massachusetts Business Corporation Act, the Articles, or the Bylaws, or (d) any action asserting a claim governed by the internal affairs doctrine, in each case subject to said courts having personal jurisdiction over the indispensable parties named as defendants therein, except that the United States District Court of Massachusetts in Boston shall be the sole and exclusive forum for any claim arising under the Securities Act of 1933, as amended, or any claim for which such other courts do not have subject matter jurisdiction including, without limitation, any claim arising under the Securities Exchange Act of 1934, as amended (the "**Exchange Act**").

**Article V – Restrictions on Transfer**

The restrictions, if any, imposed by the Articles upon the transfer of shares of any class or series of stock are: None

**Article VI – Other Lawful Provisions**

The Corporation shall have all lawful powers of a corporation organized pursuant to the MBCA. In addition to, and not in limitation of, thereof:

&nbsp;&nbsp;&nbsp;&nbsp;(a) The Corporation shall have the right, power and authority to carry on any business, operation or activity to the same extent as might an individual, whether as a principal, agent, contractor, or otherwise, and either alone or in conjunction, joint venture, partnership or other arrangement with any other entity or natural person;

&nbsp;&nbsp;&nbsp;&nbsp;(b) The Corporation shall have the right, power and authority to carry on any lawful business, operation or activity through one or more direct or indirect subsidiaries, whether wholly-owned or owned in part;

&nbsp;&nbsp;&nbsp;&nbsp;(c) The Corporation shall have the right, power and authority to be a partner in any business enterprise which the Corporation would have the power to conduct directly or through a direct or indirect subsidiary;

&nbsp;&nbsp;&nbsp;&nbsp;(d) The Board may make, amend, restate or repeal the Bylaws, in whole or in part, except with respect to any provision of the Bylaws which, by law or the terms of the Bylaws, requires the approval of the shareholders;

&nbsp;&nbsp;&nbsp;&nbsp;(e) Meetings of the shareholders of the Corporation may be held anywhere in or outside of the Commonwealth;

&nbsp;&nbsp;&nbsp;&nbsp;(f) The Directors shall have the power to fix from time to time their compensation. No person shall be disqualified from holding any office by reason of any interest. In the absence of fraud, any Director, officer, or shareholder of the Corporation, individually, or any individual having any interest in any concern which is a shareholder of the Corporation, or any concern in which any of such Directors, officers, shareholders or individuals has any interest, may be a party to or may be pecuniarily or otherwise interested in, any contract, transaction or other act of the Corporation, and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Such contract, transaction or act shall not be in any way invalidated or otherwise affected by that fact;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) No such Director, officer, shareholder or individual shall be liable to account to the Corporation for any profit or benefit realized through any such contract, transaction or act; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) Any such Director may be counted in determining the existence of a quorum at any meeting of the Board or of any committee of the Board which shall authorize any such contract, transaction or act, and may vote to authorize the same;

Provided, however, that any contract, transaction or act in which any Director or officer of the Corporation is so interested individually or as a director, officer, trustee or member of any concern which is not a direct or indirect subsidiary or affiliate of the Corporation, or in which any directors or officers are so interested as holders, collectively, of a majority of the shares of capital stock or other beneficial interest at the time outstanding in any concern which is not a direct or indirect subsidiary or affiliate of the Corporation, shall be duly authorized or ratified by a majority of the Directors who are not so interested, or by the holders of a majority of shares entitled to vote thereon then outstanding, to whom the nature of such interest has been disclosed and who have made any findings required by law.

For the purposes of this Article (a) the term "interest" shall mean and include any personal interest and any interest as a director, officer, stockholder, shareholder, trustee, member or beneficiary of any concern; (b) the term "concern" shall mean and include any corporation, association, trust, partnership, limited liability company, firm, person or other entity other than this Corporation; and (c) the phrase "subsidiary or affiliate" shall mean and include any concern in which a majority of the directors, trustees, partners or controlling persons is elected or appointed by the Directors or is constituted of the Directors or officers of this Corporation.

&nbsp;&nbsp;&nbsp;&nbsp;(g) To the fullest extent permitted by the MBCA, the Corporation shall indemnify each current and former officer, Director, and their personal representatives against: (i) all actions, proceedings, costs, charges, expenses, losses, damages or liabilities incurred or sustained by such person in or about the conduct of the Corporation's business or affairs or in the execution or discharge of such person's duties, powers, authorities or discretions, and (ii) without limitation to paragraph (i), all costs, expenses, losses or liabilities incurred by such person in defending (whether successfully or otherwise) any civil, criminal, administrative or investigative proceedings (whether threatened, pending or completed) concerning the Corporation or its affairs in any court or tribunal, whether in Massachusetts or elsewhere; *<u>provided</u>* , *<u>however</u>* , that no current or former officer or Director shall be indemnified in respect of any matter arising out of his or her own actual fraud, failure to conduct himself or herself in good faith, willful default, or willful neglect. To the extent permitted by applicable law, the Corporation may make a payment, or agree to make a payment, whether by way of advance, loan or otherwise, for any legal costs incurred by a current or former officer or director in respect of any matter identified in paragraph (i) or paragraph (ii) above on condition that such person must repay the amount paid by the Corporation to the extent that it is ultimately found not liable to indemnify such person for those legal costs.

&nbsp;&nbsp;&nbsp;&nbsp;(h) The Directors may, to the full extent permitted by the MBCA and applicable law as it presently exists, or may hereafter be amended from time to time, authorize an appropriate officer or officers to purchase and maintain at the Corporation's expense insurance: (a) to indemnify the Corporation for any obligation which it incurs as a result of the indemnification of Directors, officers and employees under the provisions of this Article VI; and (b) to indemnify and/or insure Directors, officers and employees against liability to the fullest extent permitted by the MBCA and applicable law.

&nbsp;&nbsp;&nbsp;&nbsp;(i) No amendment or repeal of any provision of these Articles or the Bylaws contemplating the indemnification of any Director or officer of the Corporation or of the relevant provisions of M.G.L. Chapter 156D shall affect or diminish the rights of any indemnified Director or officer with respect to any action or proceeding arising out of or relating to any actions occurring prior to the final adoption of such amendment or repeal. If the Massachusetts Business Corporation Act is subsequently amended to increase the scope of permitted indemnification, indemnification hereunder shall be provided to the full extent permitted or required by such amendment.

&nbsp;&nbsp;&nbsp;&nbsp;(j) The Corporation reserves the right at any time and from time to time to amend, alter, change, add or repeal any provision contained in these Articles (including any provision related to Preferred Stock), and other provisions authorized by the laws of the Commonwealth of Massachusetts at the time in force that may be added or inserted, in the manner now or hereafter prescribed by these Articles and the MBCA; and except as set forth in Article VI (g) and (h), all rights, preferences and privileges of whatever nature herein conferred upon stockholders, directors or any other persons by and pursuant to these Articles in their present form or as hereafter amended are granted subject to the right reserved in this Article VI (j).

**Article VII – Effective Date**

It is hereby certified that these Articles consolidate all amendments into a single document. If a new amendment authorizes an exchange, or effects a reclassification or cancellation, of issued shares, provisions for implementing that action are set forth in these Articles unless contained in the text of the amendment.

Specify the number(s) of the article(s) being amended: <u>I, III and IV</u>

---

| | |
|:---|:---|
| Signed by: | /s/ Harry L. You |
|  | *(signature of authorized individual)* |

---

☒ Chairman of the board of directors,

☐ President,

☐ Other officer,

☐ Court-appointed fiduciary,

On this 19<sup>th</sup> day of March, 2026

## Exhibit 4.1

**Exhibit 4.1**

**WARRANT ASSIGNMENT, ASSUMPTION AND AMENDMENT AGREEMENT** 

**among** 

**DMY SQUARED TECHNOLOGY GROUP, INC.,** 

**HORIZON QUANTUM HOLDINGS LTD.**

**and** 

**CONTINENTAL STOCK TRANSFER & TRUST COMPANY** 

**Dated March 19, 2026**

THIS WARRANT ASSIGNMENT, ASSUMPTION AND AMENDMENT AGREEMENT (this "<u>Agreement</u>")*,* dated March 19, 2026 and effective as of the effective time of the SPAC Merger (as defined below), is made by and among dMY Squared Technology Group, Inc., a Massachusetts corporation (the "<u>SPAC</u>"), Horizon Quantum Holdings Ltd., a Singapore public company limited by shares ("<u>Holdco</u>"), and Continental Stock Transfer & Trust Company, a New York corporation, as warrant agent (in such capacity, the "<u>Warrant Agent</u>"), and amends the Warrant Agreement (the "<u>Existing Warrant Agreement</u>"), dated October 4, 2022, by and between the SPAC and the Warrant Agent*.* Capitalized terms used but not defined herein shall have the meaning ascribed to such terms in the Existing Warrant Agreement.

WHEREAS, the SPAC issued and sold (a) 3,159,500 redeemable warrants as part of the units sold to public investors in its initial public offering (the "<u>Public Warrants</u>"), with each whole Public Warrant being exercisable for one share of Class A common stock of the SPAC, par value $0.0001 per share ("<u>Class A Common Stock</u>") at an initial exercise price of $11.50 per share, and (b) 2,884,660 redeemable warrants in a private placement transaction (the "<u>Private Placement Warrants</u>" and together with the Public Warrants, the "<u>Warrants</u>"), with each whole Private Placement Warrant exercisable for one share of Class A Common Stock at an initial exercise price of $11.50 per share;

WHEREAS, in order to finance the SPAC's transaction costs in connection with the Business Combination, dMY Squared Sponsor, LLC or certain of the SPAC's officers and directors may, but are not obligated to, from time to time loan to the SPAC such funds as the SPAC may require (the "<u>Working Capital Loans</u>");

WHEREAS, up to $1,500,000 of the Working Capital Loans are convertible into additional Private Placement Warrants at a price of $1.00 per Private Placement Warrant;

WHEREAS, the terms of the Warrants are governed by the Existing Warrant Agreement;

WHEREAS, on September 9, 2025, the SPAC, Holdco, Rose Acquisition Pte. Ltd., a Singapore private company limited by shares and wholly-owned subsidiary of Holdco, Horizon Merger Sub 2, Inc., a Massachusetts corporation and wholly-owned subsidiary of Holdco ("<u>Merger Sub 2</u>"), and Horizon Quantum Computing Pte. Ltd., a Singapore private company limited by shares ("<u>Horizon</u>"), entered into that certain Business Combination Agreement (as amended, modified or supplemented from time to time, the "<u>Business Combination Agreement</u>");

WHEREAS, pursuant to the Business Combination Agreement, among other things, at the SPAC Merger Effective Time (as defined in the Business Combination Agreement), Merger Sub 2 will merge with and into the SPAC, with the SPAC surviving as a wholly-owned Subsidiary of Holdco (the "<u>SPAC Merger</u>"), and as a result of the SPAC Merger, at the SPAC Merger Effective Time (i) each share of Class A Common Stock that is issued and outstanding as of immediately prior to the SPAC Merger Effective Time (including the shares of Class A Common Stock issued in connection with the SPAC Class B Conversion and the SPAC Unit Separation, but not including any redeemed SPAC Public Shares, any shares cancelled pursuant to Section 2.4(b)(iv) of the Business Combination Agreement, or any Dissenting SPAC Shares (each as defined in the Business Combination Agreement)) shall automatically be converted into one Holdco Class A ordinary share ("<u>Holdco Class A Ordinary Shares</u>") (ii) each Public Warrant that is issued and outstanding as of immediately prior to the SPAC Merger Effective Time will be assumed by Holdco (each, a "<u>Holdco Public Warrant</u>") and will no longer be exercisable for Class A Common Stock of SPAC but instead will be exercisable (subject to the terms of the Existing Warrant Agreement, as amended by this Agreement) for Holdco Class A Ordinary Shares, at an initial exercise price of $11.50 per share; and (iii) each Private Placement Warrant that is issued and outstanding as of immediately prior to the SPAC Merger Effective Time will be assumed by Holdco (each, a "<u>Holdco Private Placement Warrant</u>" and together with the Holdco Public Warrants, the "<u>Holdco Warrants</u>") and will no longer be exercisable for Class A Common Stock of SPAC but instead will be exercisable (subject to the terms of the Existing Warrant Agreement, as amended by this Agreement) for Holdco Class A Ordinary Shares, at an initial exercise price of $11.50 per share;

WHEREAS, the Holdco Class A Ordinary Shares constitute the Alternative Issuance pursuant to <u>Section 4.5</u> of the Existing Warrant Agreement;

WHEREAS, the Board of Directors of the SPAC has determined that the consummation of the transactions contemplated by the Business Combination Agreement constitute a Business Combination;

WHEREAS, in connection with the SPAC Merger, the SPAC desires to assign all of its right, title and interest in the Existing Warrant Agreement to Holdco, and Holdco wishes to accept such assignment; and

WHEREAS, <u>Section 9.8</u> of the Existing Warrant Agreement provides that the SPAC and the Warrant Agent may amend the Existing Warrant Agreement without the consent of any Registered Holders for the purpose of curing any ambiguity, or correcting any mistake or defective provision contained therein or adding or changing any other provisions with respect to matters or questions arising under the Existing Warrant Agreement as the parties may deem necessary or desirable and that the parties deem shall not adversely affect the interest of the Registered Holders.

NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the parties hereto agree as follows:

**Section 1. <u>Assignment and Assumption; Consent</u>.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1 <u>Assignment and Assumption</u>. As of and with effect on and from the SPAC Merger Effective Time, (i) the SPAC hereby assigns to Holdco all of the SPAC's right, title and interest in and to the Existing Warrant Agreement (as amended hereby), and (ii) Holdco hereby assumes, and agrees to pay, perform, satisfy and discharge in full, as the same become due, all of the SPAC's liabilities and obligations under the Existing Warrant Agreement (as amended hereby) arising on, from and after the SPAC Merger Effective Time.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.2 <u>Consent</u>. The Warrant Agent hereby consents to (i) the assignment of the Existing Warrant Agreement by the SPAC to Holdco pursuant to this <u>Section 1</u> and the assumption of the Existing Warrant Agreement by Holdco from the SPAC pursuant to <u>Section 1</u> hereof, in each case effective as of the SPAC Merger Effective Time, and (ii) the continuation of the Existing Warrant Agreement (as amended hereby), in full force and effect from and after the SPAC Merger Effective Time.

**Section 2. <u>Amendment of Existing Warrant Agreement</u>.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.1 Effective as of the SPAC Merger Effective Time, the SPAC and the Warrant Agent hereby amend the Existing Warrant Agreement as provided in this <u>Section 2</u>, and acknowledge and agree that the amendments to the Existing Warrant Agreement set forth in this <u>Section 2</u> are to provide for the delivery of the Alternative Issuance pursuant to <u>Section 4.5</u> of the Existing Warrant Agreement (in connection with the SPAC Merger and the transactions contemplated by the Business Combination Agreement).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.2 <u>References to the Company</u>. The preamble to the Existing Warrant Agreement is hereby amended by deleting "dMY Squared Technology Group, Inc." and replacing it with "Horizon Quantum Holdings Ltd." As a result thereof, all references to the "Company" in the Existing Warrant Agreement shall be references to Horizon Quantum Holdings Ltd. rather than dMY Squared Technology Group, Inc.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.3 <u>References to Common Stock</u>. All references to the "Common Stock" that holders of Warrants are entitled to purchase in the Existing Warrant Agreement (including <u>Exhibit B</u> thereto) shall be references to "Class A Ordinary Shares" of Holdco.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.4 <u>References to Articles</u>. All references to the "Articles" shall be references to the "Amended & Restated Constitution" of Horizon Quantum Holdings Ltd.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.5 <u>References to Business Combination</u>. All references to "Business Combination" in the Existing Warrant Agreement (including all Exhibits thereto) shall be references to the transactions contemplated by the Business Combination Agreement, and references to "the consummation of its initial Business Combination," "the completion by the Company of an initial Business Combination" and all variations thereof in the Existing Warrant Agreement (including all Exhibits thereto) shall be references to the consummation of the transactions contemplated by the Business Combination Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.6 <u>References to Business Day</u>. All references to "Business Day" in the Existing Warrant Agreement (including all Exhibits thereto) shall mean any day other than a Saturday, Sunday or any other day on which commercial banks are required or authorized to close in the State of New York, the Commonwealth of Massachusetts and Singapore.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.7 <u>References to Current Report on Form 8-K and Quarterly Report on Form 10-Q</u>. All references to "Current Report on Form 8-K" and "Quarterly Report on Form 10-Q" in the Existing Warrant Agreement (including all Exhibits thereto) shall be references to "Current Report on Form 6-K".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.8 <u>References to Annual Report on Form 10-K</u>. All references to "Annual Report on Form 10-K" in the Existing Warrant Agreement (including all Exhibits thereto) shall be references to "Annual Report on Form 20-F".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.9 <u>Detachability of Warrants</u>. <u>Section 2.4</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.10 <u>Fractional Warrants</u>. <u>Section 2.5</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"2.5 <u>Fractional Warrants</u>. The Company shall not issue fractional Warrants."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.11 <u>Private Placement Warrants</u>. <u>Sections 2.6(e) and (g)</u> of the Existing Warrant Agreement are amended by deleting such Sections and replacing them entirely as follows:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.12 <u>Extension Warrants</u>. <u>Section 2.7</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.13 <u>Duration of Warrants</u>. <u>Section 3.2</u> of the Existing Warrant Agreement is amended and restated by deleting it and inserting the following:

"3.2 <u>Duration of Warrants</u>. A Warrant may be exercised only during the period (the "***Exercise Period***") (A) commencing the date that is thirty (30) days after March 19, 2026, and (B) terminating at the earliest to occur of (x) 5:00 p.m., New York City time on the date that is five (5) years after March 19, 2026 and (y) other than with respect to the Private Placement Warrants then held by the Sponsor or its Permitted Transferees with respect to a redemption pursuant to <u>Sections 6.1</u> or 6.2 hereof, 5:00 p.m., New York City time on the Redemption Date (as defined below) as provided in <u>Section 6.3</u> hereof (the "***Expiration Date***"); *provided*, *however*, that the exercise of any Warrant shall be subject to the satisfaction of any applicable conditions, as set forth in <u>subsection 3.3.2</u> below, with respect to an effective registration statement or a valid exemption therefrom being available. Except with respect to the right to receive the Redemption Price (as defined below) (other than with respect to a Private Placement Warrant then held by the Sponsor or its Permitted Transferees) in the event of a redemption (as set forth in <u>Section 6</u> hereof), each Warrant (other than a Private Placement Warrant then held by the Sponsor or its Permitted Transferees) not exercised on or before the Expiration Date shall become void, and all rights thereunder and all rights in respect thereof under this Agreement shall cease at 5:00 p.m. New York City time on the Expiration Date. The Company in its sole discretion may extend the duration of the Warrants by delaying the Expiration Date; *provided* that the Company shall provide at least twenty (20) days prior written notice of any such extension to Registered Holders of the Warrants; *provided further* that any such extension shall be identical in duration among all the Warrants."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.14 <u>Extraordinary Dividends</u>. <u>Section 4.1.2</u> of the Existing Warrant Agreement is hereby deleted and replaced with the following:

"4.1.2 <u>Extraordinary Dividends</u>. If the Company, at any time while the Warrants are outstanding and unexpired, shall pay a dividend or make a distribution in cash, securities, or other assets to all or substantially all of the holders of the Class A Ordinary Shares on account of such Class A Ordinary Shares (or other securities of the Company's share capital into which the Warrants are convertible), other than (a) as described in <u>subsection 4.1.1</u> above or (b) Ordinary Cash Dividends (as defined below) (any such non-excluded event being referred to herein as an "***Extraordinary Dividend***"), then the Warrant Price shall be decreased, effective immediately after the effective date of such Extraordinary Dividend, by the amount of cash and/or the fair market value (as determined by the Company's board of directors (the "***Board***"), in good faith) of any securities or other assets paid on each Class A Ordinary Share in respect of such Extraordinary Dividend. For purposes of this <u>subsection 4.1.2</u>, "***Ordinary Cash Dividends***" means any cash dividend or cash distribution which, when combined on a per share basis with the per share amounts of all other cash dividends and cash distributions paid on the Class A Ordinary Shares during the 365-day period ending on the date of declaration of such dividend or distribution to the extent it does not exceed $0.50 (which amount shall be adjusted to appropriately reflect any of the events referred to in other subsections of this <u>Section 4</u> and excluding cash dividends or cash distributions that resulted in an adjustment to the Warrant Price or to the number of Class A Ordinary Shares issuable on exercise of each Warrant) but only with respect to the amount of the aggregate cash dividends or cash distributions equal to or less than $0.50 per share (which amount shall be adjusted to appropriately reflect any of the events referred to in other subsections of this Section 4 and excluding cash dividends or cash distributions that resulted in an adjustment to the Warrant Price or to the number of shares of Class A Ordinary Shares issuable on exercise of each Warrant)."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.15 <u>Raising of the Capital in Connection with the Initial Business Combination</u>. Section 4.4 of the Existing Warrant Agreement is hereby deleted and replaced with the following:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.16 <u>Replacement of Securities upon Reorganization, etc</u>. <u>Section 4.5(ii)</u> of the Existing Warrant Agreement is hereby amended to remove the clause "(other than a tender, exchange or redemption offer made by the Company in connection with redemption rights held by shareholders of the Company as provided for in the Articles or as a result of the redemption of Common Stock by the Company if a proposed initial Business Combination is presented to the shareholders of the Company for approval)", which clause shall be deemed deleted.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.17 <u>No Adjustment</u>. <u>Section 4.10</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.18 <u>Fractional Warrants</u>. <u>Section 5.3</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"5.3 <u>Fractional Warrants</u>. The Warrant Agent shall not be required to effect any registration of transfer or exchange which shall result in the issuance of a warrant certificate or book-entry position for a fraction of a Warrant."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.19 <u>Transfer of Warrants</u>. <u>Section 5.6</u> of the Existing Warrant Agreement is hereby deleted and replaced with the following:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.20 <u>Redemption of Warrants for Shares of Common Stock</u>. The last paragraph of <u>Section 6.2</u> of the Existing Warrant Agreement is hereby amended by deleting such paragraph and replacing it entirely as follows:

"The share prices set forth in the column headings of the table above shall be adjusted as of any date on which the number of shares issuable upon exercise of a Warrant or the Warrant Price is adjusted pursuant to <u>Section 4</u> hereof. If the number of shares issuable upon exercise of a Warrant is adjusted pursuant to <u>Section 4</u> hereof, the adjusted share prices in the column headings shall equal the share prices immediately prior to such adjustment, multiplied by a fraction, the numerator of which is the number of shares deliverable upon exercise of a Warrant immediately prior to such adjustment and the denominator of which is the number of shares deliverable upon exercise of a Warrant as so adjusted. The number of shares in the table above shall be adjusted in the same manner and at the same time as the number of shares issuable upon exercise of a Warrant. If the Warrant Price of a warrant is adjusted in the case of an adjustment pursuant to <u>Section 4.1.2</u> hereof, the adjusted share prices in the column headings shall equal the share prices immediately prior to such adjustment less the decrease in the Warrant Price pursuant to such Warrant Price adjustment. In no event shall the number of shares issued in connection with a Make-Whole Exercise exceed 0.361 shares of Common Stock per Warrant (subject to adjustment).".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.21 <u>Registration of Common Stock</u>. <u>Section 7.4.1</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"The Company agrees that as soon as practicable, but in no event later than fifteen (15) Business Days after March 19, 2026, it shall use its commercially reasonable efforts to file with the Commission a registration statement for the registration, under the Securities Act, of the shares of Common Stock issuable upon exercise of the Warrants. The Company shall use its commercially reasonable efforts to cause the same to become effective and to maintain the effectiveness of such registration statement, and a current prospectus relating thereto, until the expiration of the Warrants in accordance with the provisions of this Agreement. If any such registration statement has not been declared effective by the sixtieth (60th) Business Day following March 19, 2026, holders of the Warrants shall have the right, during the period beginning on the sixty-first (61st) Business Day after March 19, 2026, and ending upon such registration statement being declared effective by the Commission, and during any other period when the Company shall fail to have maintained an effective registration statement covering the shares of Common Stock issuable upon exercise of the Warrants, to exercise such Warrants on a "cashless basis," by exchanging the Warrants (in accordance with Section 3(a)(9) of the Securities Act or another exemption) for that number of shares of Common Stock equal to the lesser of (A) the quotient obtained by dividing (x) the product of the number of shares of Common Stock underlying the Warrants, multiplied by the excess of the "Fair Market Value" (as defined below) less the Warrant Price by (y) the Fair Market Value and (B) 0.361. Solely for purposes of this <u>subsection 7.4.1</u>, "***Fair Market Value***" shall mean the volume-weighted average price of the Class A Ordinary Shares as reported during the ten (10) trading day period ending on the trading day prior to the date that notice of exercise is received by the Warrant Agent from the holder of such Warrants or its securities broker or intermediary. The date that notice of "cashless exercise" is received by the Warrant Agent shall be conclusively determined by the Warrant Agent. In connection with the "cashless exercise" of a Public Warrant, the Company shall, upon request, provide the Warrant Agent with an opinion of counsel for the Company (which shall be an outside law firm with securities law experience) stating that (i) the exercise of the Warrants on a "cashless basis" in accordance with this <u>subsection 7.4.1</u> is not required to be registered under the Securities Act and (ii) the Class A Ordinary Shares issued upon such exercise shall be freely tradable under United States federal securities laws by anyone who is not an affiliate (as such term is defined in Rule 144 (or any successor rule) under the Securities Act) of the Company and, accordingly, shall not be required to bear a restrictive legend. Except as provided in <u>subsection 7.4.2</u>, for the avoidance of any doubt, unless and until all of the Warrants have been exercised or have expired, the Company shall continue to be obligated to comply with its registration obligations under the first three sentences of this <u>subsection 7.4.1</u>."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.22 <u>Waiver</u>. <u>Section 8.6</u> of the Existing Warrant Agreement is hereby amended by deleting such Section and replacing it entirely as follows:

"[intentionally omitted]".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.23 <u>Warrant Certificate</u>. <u>Exhibit A</u> to the Existing Warrant Agreement is hereby amended by deleting <u>Exhibit A</u> in its entirety and replacing it with a new <u>Exhibit A</u> attached hereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.24 <u>Notice Clause</u>. <u>Section 9.2</u> of the Existing Warrant Agreement is hereby deleted and replaced with the following:

"<u>Notices</u>. Any notice, statement or demand authorized by this Agreement to be given or made by the Warrant Agent or by the holder of any Warrant to or on the Company shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private courier service within five (5) days after deposit of such notice, postage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), as follows:

Horizon Quantum Computing Pte. Ltd.

29 Media Cir., #05-22

Singapore, 138565

Attn: Joe Fitzsimons

E-mail: joe@horizonquantum.com

with a copy (which shall not constitute notice) to:

Ellenoff Grossman & Schole LLP

1345 Avenue of the Americas, 11<sup>th</sup> Fl

New York, NY 10105

Attention: Adam C. Berkaw; David H. Landau

Email: aberkaw@egsllp.com; dlandau@egsllp.com

Any notice, statement or demand authorized by this Agreement to be given or made by the holder of any Warrant or by the Company to or on the Warrant Agent shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private courier service within five (5) days after deposit of such notice, postage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), as follows:

Continental Stock Transfer & Trust Company

One State Street, 30<sup>th</sup> Floor

New York, NY 10004

Attention: Compliance Department"

**Section 3. <u>Miscellaneous Provisions</u>.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.1 <u>Effectiveness of the Amendment</u>. Each of the parties hereto acknowledges and agrees that the effectiveness of this Agreement shall be expressly subject to the occurrence of the SPAC Merger and shall automatically be terminated and shall be null and void if the Business Combination Agreement shall be terminated for any reason.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.2 <u>Successors</u>. All the covenants and provisions of this Agreement by or for the benefit of Holdco, the SPAC or the Warrant Agent shall bind and inure to the benefit of their respective successors and assigns.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.4 <u>Counterparts</u>. This Agreement may be executed in any number of original or facsimile counterparts and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. A signed copy of this Agreement delivered by facsimile, e-mail or other means of electronic transmission shall be deemed to have the same legal effect as delivery of an original signed copy of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.5 <u>Effect of Headings</u>. The section headings herein are for convenience only and are not part of this Agreement and shall not affect the interpretation thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.6 <u>Severability</u>. This Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this Agreement or of any other term or provision hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this Agreement a provision as similar in terms to such invalid or unenforceable provision as may be possible and be valid and enforceable.

*[Signature Page Follows]*

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed as of the date first above written.

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| | | |
|:---|:---|:---|
| **DMY SQUARED TECHNOLOGY GROUP, INC.** | **DMY SQUARED TECHNOLOGY GROUP, INC.** | **DMY SQUARED TECHNOLOGY GROUP, INC.** |
| By: | /s/ Harry L. You | /s/ Harry L. You |
|  | Name: | Harry L. You |
|  | Title: | Chief Executive Officer, Chief Financial Officer and Chairman |
| **HORIZON QUANTUM HOLDINGS LTD.** | **HORIZON QUANTUM HOLDINGS LTD.** | **HORIZON QUANTUM HOLDINGS LTD.** |
| By: | /s/ Joseph Francis Fitzsimons | /s/ Joseph Francis Fitzsimons |
|  | Name: | Joseph Francis Fitzsimons |
|  | Title: | Chief Executive Office |
| **CONTINENTAL STOCK TRANSFER & TRUST COMPANY,**<br> **as Warrant Agent** | **CONTINENTAL STOCK TRANSFER & TRUST COMPANY,**<br> **as Warrant Agent** | **CONTINENTAL STOCK TRANSFER & TRUST COMPANY,**<br> **as Warrant Agent** |
| By: | /s/ Erika Young | /s/ Erika Young |
|  | Name: | Erik Young |
|  | Title: | Vice President |

---

*[Signature Page to Warrant Assignment, Assumption and Amendment Agreement]*

**EXHIBIT A**

**FORM OF WARRANT CERTIFICATE** 

**See attached.** 

[Form of Warrant Certificate]

[FACE]

Number ___

**Warrants** 

**THIS WARRANT SHALL BE NULL AND VOID IF NOT EXERCISED PRIOR TO** 

**THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR<br> IN THE WARRANT AGREEMENT DESCRIBED BELOW** 

**HORIZON QUANTUM HOLDINGS LTD.**

*Incorporated Under the Laws of Singapore*

CUSIP Y4000A128

**Warrant Certificate** 

This warrant certificate (this "***Warrant Certificate***") certifies that , or registered assigns, is the registered holder of warrant(s) evidenced hereby (the "***Warrants***," and each, a "***Warrant***") to purchase Class A ordinary shares ("***Class A Ordinary Shares***") of Horizon Quantum Holdings Ltd., a Singapore public company limited by shares (the "***Company***"). Each whole Warrant entitles the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive from the Company that number of fully paid and non-assessable Class A Ordinary Shares as set forth below, at the exercise price (the "***Warrant Price***") as determined pursuant to the Warrant Agreement, payable in lawful money of the United States of America (or through "cashless exercise" as provided for in the Warrant Agreement) upon surrender of this Warrant Certificate and payment of the Warrant Price at the office or agency of the Warrant Agent referred to below, subject to the conditions set forth herein and in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement.

Each whole Warrant is initially exercisable for one Class A Ordinary Share. No fractional shares will be issued upon exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional interest in a Class A Ordinary Shares, the Company will, upon exercise, round down to the nearest whole number of Class A Ordinary Shares to be issued to the Warrant holder. The number of Class A Ordinary Shares issuable upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events as set forth in the Warrant Agreement.

The initial Warrant Price is equal to $11.50 per Class A Ordinary Share. The Warrant Price is subject to adjustment upon the occurrence of certain events as set forth in the Warrant Agreement.

Subject to the conditions set forth in the Warrant Agreement, the Warrants may be exercised only during the Exercise Period and, to the extent not exercised by the end of such Exercise Period, such Warrants shall become void. The Warrants may be redeemed, subject to certain conditions, as set forth in the Warrant Agreement.

Reference is hereby made to the further provisions of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for all purposes have the same effect as though fully set forth at this place.

This Warrant Certificate shall not be valid unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.

This Warrant Certificate shall be governed by and construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles thereof.

---

| | |
|:---|:---|
| **HORIZON QUANTUM HOLDINGS LTD.** | **HORIZON QUANTUM HOLDINGS LTD.** |
| By: |  |
|  | Name: |
|  | Title: |
| **CONTINENTAL STOCK TRANSFER & TRUST COMPANY,**<br> **as Warrant Agent** | **CONTINENTAL STOCK TRANSFER & TRUST COMPANY,**<br> **as Warrant Agent** |
| By: |  |
|  | Name: |
|  | Title: |

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[Form of Warrant Certificate]

[Reverse]

The Warrants evidenced by this Warrant Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive Class A Ordinary Shares and are issued or to be issued pursuant to a Warrant Agreement, dated October 4, 2022 as duly executed and delivered by dMY Squared Technology Group, Inc., a Massachusetts corporation (the "***SPAC***"), to Continental Stock Transfer & Trust Company, a New York corporation, as warrant agent (the "***Warrant Agent***"), as amended by the Warrant Assignment, Assumption and Amendment Agreement, dated as of March 19, 2026, by and among the SPAC, the Warrant Agent and the Company (as amended, the "***Warrant Agreement***"), which Warrant Agreement is hereby incorporated by reference in and made a part of this instrument and is hereby referred to for a description of the rights, limitation of rights, obligations, duties, and immunities thereunder of the Warrant Agent, the Company, and the holders (the words "***holders***" or "***holder***" meaning the Registered Holders or Registered Holder, respectively) of the Warrants. A copy of the Warrant Agreement may be obtained by the holder hereof upon written request to the Company.

Warrants may be exercised at any time during the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise them by surrendering this Warrant Certificate, with the form of Election to Purchase set forth hereon properly completed and executed, together with payment of the Warrant Price as specified in the Warrant Agreement (or through "cashless exercise" as provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced hereby, there shall be issued to the holder hereof or his, her, or its assignee, a new Warrant Certificate evidencing the number of Warrants not exercised.

Notwithstanding anything else in this Warrant Certificate or the Warrant Agreement, no Warrant may be exercised unless, at the time of exercise, (i) a registration statement covering the Class A Ordinary Shares to be issued upon exercise is effective under the Securities Act and (ii) a prospectus thereunder relating to the Class A Ordinary Shares is current, except through "cashless exercise" as provided for in the Warrant Agreement.

The Warrant Agreement provides that, upon the occurrence of certain events, the number of Class A Ordinary Shares issuable upon exercise of the Warrants set forth on the face hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to receive a fractional interest in a Class A Ordinary Share, the Company shall, upon exercise, round down to the nearest whole number of Class A Ordinary Shares to be issued to the holder of the Warrant.

Warrant Certificates, when surrendered at the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative or attorney duly authorized in writing, may be exchanged in the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing in the aggregate a like number of Warrants.

Upon due presentation for registration of transfer of this Warrant Certificate at the office of the Warrant Agent, a new Warrant Certificate or Warrant Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any tax or other governmental charge imposed in connection therewith.

The Company and the Warrant Agent may deem and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the holder(s) hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither the Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a shareholder of the Company.

Election to Purchase

(To Be Executed Upon Exercise of Warrant)

The undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, to _________ Class A Ordinary Shares, and herewith tenders payment for such Class A Ordinary Shares to the order of the Company in the amount of $_________ in accordance with the terms hereof. The undersigned requests that certificates for such Class A Ordinary Shares be registered in the name of _________, whose address is _________, and that such Class A Ordinary Shares be delivered to _________, whose address is _________. If said number of Class A Ordinary Shares is less than all of the Class A Ordinary Shares purchasable hereunder, the undersigned requests that a new Warrant Certificate representing the remaining balance of such Class A Ordinary Shares be registered in the name of _________, whose address is _________, and that such Warrant Certificate be delivered to _________, whose address is _________.

In the event that the Warrant has been called for redemption by the Company pursuant to <u>Section 6.2</u> of the Warrant Agreement and a holder thereof elects to exercise its Warrant pursuant to a Make-Whole Exercise, the number of Class A Ordinary Shares that this Warrant is exercisable for shall be determined in accordance with <u>subsection 3.3.1(c)</u> or <u>Section 6.2</u> of the Warrant Agreement, as applicable.

In the event that the Warrant is a Private Placement Warrant that is to be exercised on a "cashless basis" pursuant to <u>subsection 3.3.1(c)</u> of the Warrant Agreement, the number of Class A Ordinary Shares that this Warrant is exercisable for shall be determined in accordance with <u>subsection 3.3.1(c</u>) of the Warrant Agreement.

In the event that the Warrant is to be exercised on a "cashless basis" pursuant to <u>Section 7.4</u> of the Warrant Agreement, the number of Class A Ordinary Shares that this Warrant is exercisable for shall be determined in accordance with <u>Section 7.4</u> of the Warrant Agreement.

In the event that the Warrant may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number of Class A Ordinary Shares that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant Agreement which allows for such cashless exercise and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement, to receive Class A Ordinary Shares. If said number of Class A Ordinary Shares is less than all of the Class A Ordinary Shares purchasable hereunder (after giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing the remaining balance of such Class A Ordinary Shares be registered in the name of _________, whose address is _________, and that such Warrant Certificate be delivered to _________, whose address is _________.

[*Signature Page Follows*]

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THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS, AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO RULE 17Ad-15 (OR ANY SUCCESSOR RULE) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).