# EDGAR Filing Document

**Accession Number:** 0002088256
**File Stem:** 0001213900-26-031930
**Filing Date:** 2026-3
**Character Count:** 10644
**Document Hash:** 8de655dd8d407551b3a6bace8ebc9904
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-031930.hdr.sgml**: 20260319

**ACCESSION NUMBER**: 0001213900-26-031930

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260319

**FILED AS OF DATE**: 20260319

**DATE AS OF CHANGE**: 20260319

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Horizon Quantum Holdings Ltd.
- **CENTRAL INDEX KEY:** 0002088256
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** U0
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43203
- **FILM NUMBER:** 26775029

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** ALICE@MEDIAOPOLIS
- **STREET 2:** 29 MEDIA CIRCLE #05-22
- **CITY:** SINGAPORE
- **PROVINCE COUNTRY:** U0
- **ZIP:** 138565
- **BUSINESS PHONE:** 6581015024

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** ALICE@MEDIAOPOLIS
- **STREET 2:** 29 MEDIA CIRCLE #05-22
- **CITY:** SINGAPORE
- **PROVINCE COUNTRY:** U0
- **ZIP:** 138565

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Horizon Quantum Holdings Pte. Ltd.
- **DATE OF NAME CHANGE:** 20251230

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Rose Holdco Pte. Ltd.
- **DATE OF NAME CHANGE:** 20250924

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 6-K**

**REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16**

**OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934** 

For the month of March 2026

Commission File Number: 001-43203

**Horizon Quantum Holdings Ltd.**

(Exact name of registrant as specified in its charter)

29 Media Cir., #05-22

Singapore, 138565

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐

**<u>SIGNATURES</u>**

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, thereunto duly authorized.

---

| | |
|:---|:---|
| **Horizon Quantum Holdings Ltd.** | **Horizon Quantum Holdings Ltd.** |
| By: | /s/ Joseph Fitzsimons |
| Name: | Joseph Fitzsimons |
| Title: | Chief Executive Officer and Chairman |

---

Date: March 19, 2026

**EXHIBIT INDEX**

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| Exhibit 99.1 | [Press Release](ea028263301ex99-1.htm) |

---

## Exhibit 99.1

**Exhibit 99.1**

**Horizon Quantum, a Leading Quantum Software Infrastructure Company, Closes its Business Combination with dMY Squared** 

 

*Transaction provides nearly $120 million of gross proceeds*

 

*Horizon to begin trading on March 20 on Nasdaq under the ticker symbol "HQ"*

SINGAPORE & LAS VEGAS, NV, March 19, 2026 —ec.gov(BUSINESS WIRE)— Horizon Quantum Computing Pte. Ltd. ("Horizon Quantum"), a pioneer of software infrastructure for quantum applications, today announced that it has completed its previously announced business combination (the "Business Combination") with dMY Squared Technology Group, Inc. ("dMY") (OTC: "DMYY", "DMYYU" and "DMYYW"), a publicly traded special purpose acquisition company. The Business Combination was approved by dMY's shareholders at dMY's special meeting held on March 17, 2026. On March 20, 2026, the combined company's Class A ordinary shares and warrants will begin trading on Nasdaq under the ticker symbols "HQ" and "HQWWW," respectively.

Horizon Quantum is building software infrastructure that empowers developers to use quantum computing to solve the world's toughest computational problems. The closing of the Business Combination provides Horizon Quantum with gross proceeds of approximately $120 million, before transaction expenses, which the company plans to use to accelerate its investments in research and development, strengthen its hardware testbed, and further advance its integrated development environment Triple Alpha.

"Recent rapid progress in advancing quantum computing hardware and breakthroughs in error correction mean that the field is reaching an inflection point. With today's closing and our Nasdaq listing, Horizon Quantum is positioned to deliver the software infrastructure that will power this next phase of computing and help enable broad quantum advantage across tough computational problems," said Dr Joe Fitzsimons, Founder and CEO of Horizon Quantum. "While there is still much work needed before quantum computers reach their full potential, with more than 20 years in quantum computing research, I have never been more excited about the prospects and future of the technology."

Harry You, Chairman and CEO of dMY, said, "Over the tenure of my career, I have witnessed many technology companies triumph, and I have found that the ones who are most successful in building long-term shareholder value have been those that build software infrastructure and operating systems. Horizon Quantum is compelling because the company is approaching the quantum industry with hardware-agnostic software infrastructure that stands to benefit regardless of which way the market share ultimately falls across the competing quantum modalities, including the cloud."

**Advisors**

Needham & Company, LLC, served as dMY's exclusive financial advisor and exclusive placement agent for the PIPE transaction. Ellenoff Grossman & Schole LLP represented Horizon Quantum as legal counsel and Rajah & Tann Singapore LLP represented Horizon Quantum as Singapore legal counsel. White & Case LLP represented dMY as legal counsel and TCF Law Group, PLLC represented dMY as Massachusetts legal counsel. Pillsbury Winthrop Shaw Pittman LLP represented Needham & Company as legal counsel. ICR, LLC, served as dMY's strategic communications advisor.

**About Horizon Quantum**

Horizon Quantum's mission is to unlock broad quantum advantage by building software infrastructure that empowers developers to use quantum computing to solve the world's toughest computational problems. Founded in 2018 by Dr Fitzsimons, a leading researcher and former professor with more than two decades of experience in quantum computing, the company seeks to bridge the gap between today's quantum hardware and tomorrow's applications through the creation of advanced software development tools. Its integrated development environment, Triple Alpha, enables developers to write sophisticated, hardware-agnostic quantum programs at multiple levels of abstraction. Learn more at www.horizonquantum.com.

***Cautionary Note Regarding Forward-Looking Statements***

This press release includes "forward-looking statements" with respect to Horizon Quantum. The expectations, estimates, and projections of the businesses of Horizon Quantum may differ from their actual results and consequently, you should not rely on these forward-looking statements as predictions of future events. Words such as "expect," "estimate," "anticipate," "intend," "may," "will," "could," "should," "potential," "plan" and similar expressions are intended to identify such forward-looking statements. Actual results may differ materially and adversely from those expressed or implied in any forward-looking statements and Horizon Quantum therefore cautions against placing undue reliance on any of these forward- looking statements. Many of these factors are outside of the control of Horizon Quantum and are difficult to predict. Factors that may cause such differences include, but are not limited to: (1) statements regarding estimates and forecasts of other financial, performance and operational metrics and projections of market opportunity; (2) references with respect to the anticipated benefits of the Business Combination and the projected future financial performance of Horizon Quantum; (3) the outcome of any legal proceedings that may be instituted against the parties following the closing of the Business Combination; (4) Horizon Quantum's ability to scale and grow its business, including through the use of proceeds of the Business Combination, and the advantages and expected growth of Horizon Quantum; (5) the cash position of Horizon Quantum following the closing of the Business Combination; (6) the ability to recognize the anticipated benefits of the Business Combination, which may be affected by, among other things, competition, the ability of Horizon Quantum to grow and manage growth profitably and source and retain its key employees; (7) costs related to the Business Combination; (8) changes in applicable laws and regulations or political and economic developments; (9) the possibility that Horizon Quantum may be adversely affected by other economic, business and/or competitive factors; (10) Horizon Quantum's estimates of expenses and profitability; (11) difficulties operating Horizon Quantum's quantum processor and the possibility that the quantum processor does not provide the advantages that Horizon Quantum expects; (12) the ability of Horizon Quantum to integrate access to its quantum computing test bed within its Triple Alpha platform; (13) the ability of Horizon Quantum's coding languages to provide additional abstraction when compared to other quantum computing solutions; (14) the entry into the side letter, dated December 4, 2025, as amended, among Horizon Quantum, Horizon Quantum Holdings Ltd., dMY, and IonQ, Inc. (the "Side Letter"), and Horizon Quantum's ability to recognize the benefits of the Side Letter; (15) the ability to maintain the listing of Horizon Quantum's Class A ordinary shares and warrants on Nasdaq following the Business Combination; and (16) other risks and uncertainties included in the "Risk Factors" sections of the Registration Statement on Form F-4 filed by Horizon Quantum in connection with the Business Combination, and other documents filed or to be filed with the SEC by Horizon Quantum. The foregoing list of factors is not exclusive. You should not place undue reliance upon any forward-looking statements, which speak only as of the date made. Horizon Quantum and dMY do not undertake or accept any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements to reflect any change in their expectations or any change in events, conditions, or circumstances on which any such statement is based, except as required by law.

**Investor contact**

Katherine Bailon

investors@horizonquantum.com

**Media contact**

Yanina Blaclard

media@horizonquantum.com