# Horizon Quantum Holdings Ltd. (HQWWW) — merger/spac_merger [pending]
Source: SEC API (secapi.ai) · situation sit_8db68cdfb25887648be6 · retrieved 2026-08-11T16:10:45.450Z

## Overview
Horizon Quantum Holdings Ltd. (formerly Rose Holdco Pte. Ltd.) is a Singapore public company that, through its subsidiary Horizon Quantum Computing Pte. Ltd., develops quantum computing solutions including a quantum processor and the Triple Alpha platform for quantum computing applications.

On March 9, 2026, dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd., and Horizon Quantum Computing Pte. Ltd. executed amendments to PIPE Subscription Agreements originally dated December 4, 2025 and March 6, 2026, whereby PIPE investors committed to purchase approximately $111.9 million of Holdco's Class A ordinary shares at the Redemption Price. The Amendment grants PIPE investors a Reduction Right, allowing them to satisfy their PIPE Investment using Currently Owned Shares of dMY Class A common stock or Open-Market Purchase Shares purchased at prices below the Redemption Price, reducing their PIPE share purchase obligations on a one-for-one basis. The Reduction Right must be exercised no later than one Business Day prior to the redemption deadline for dMY's special meeting. Additionally, on March 9, 2026, the parties amended the Side Letter with IonQ, Inc., removing the condition that IonQ's PIPE closing be contingent on entry into a commercial agreement for quantum computing hardware purchases.

## Terms
- Counterparty: PIPE Investors (institutional, accredited, qualified institutional buyers, and strategic investors including IonQ, Inc.) · Deal value: $111.9M · Consideration: mixed

## Key dates
- Announced 2026-01-12

## Timeline
- 2026-01-12 · 425 (0001213900-26-003252): 425 - Horizon Quantum Holdings Pte. Ltd. — *dMY Squared Technology Group, Inc. is a blank check company (special purpose acquisition company) incorporated in Massachusetts and trading on OTC Markets.* dMY Squared Technology Group, Inc. entered into a business combination agreement on September 9, 2025, with Horizon Quantum Holdings Pte. Ltd. (formerly Rose Holdco Pte. Ltd.) and Horizon Quantum Computing Pte. Ltd. to combine the two companies. The transaction includes an approximately $110 million PIPE (private investment in public equity) financing, with a letter agreement with IonQ, Inc. related to such financing. The parties plan to file a Form F-4 registration statement with the SEC, and dMY shareholders will vote on the business combination at a special meeting to be held after the registration statement is declared effective.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-003252.txt
- 2026-01-20 · 425 (0001213900-26-005428): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum develops hardware-agnostic quantum software infrastructure and programming tools, including its Triple Alpha integrated development environment, to enable developers to build quantum applications across multiple quantum computing platforms.* Horizon Quantum Holdings Pte. Ltd. (formerly Rose Holdco Pte. Ltd.) is combining with blank-check company dMY Squared Technology Group, Inc. via a business combination agreement dated September 9, 2025. The transaction includes a private placement (PIPE) of approximately $110 million of Holdco's Class A ordinary shares. Horizon Quantum, founded in 2018 by Dr. Joe Fitzsimons, develops hardware-agnostic quantum software infrastructure and programming tools. The combined entity will be listed on a major U.S. exchange (NYSE, NYSE American, or Nasdaq). A Form F-4 registration statement has been filed, and dMY Squared shareholders will vote on the business combination at a special meeting.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-005428.txt
- 2026-01-27 · 425 (0001213900-26-007873): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum develops quantum software development tools and infrastructure, including its Triple Alpha integrated development environment, to enable developers to solve complex computational problems; the company operates a quantum processor testbed in Singapore and was founded in 2018 by Dr. Joe Fitzsimons.* Horizon Quantum Holdings Pte. Ltd. (formerly Rose Holdco Pte. Ltd.) is combining with blank-check company dMY Squared Technology Group, Inc. via a business combination agreement dated September 9, 2025. The transaction includes a private placement (PIPE) of approximately $110 million of Holdco's Class A ordinary shares. A Form F-4 registration statement has been filed, and dMY Squared shareholders will vote on the business combination at a special meeting. The combined entity will be listed on a major U.S. exchange (NYSE, NYSE American, or Nasdaq).
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-007873.txt
- 2026-03-09 · 425 (0001213900-26-024971): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum Computing develops quantum software infrastructure and programming tools, including its Triple Alpha integrated development environment, to enable developers to write hardware-agnostic quantum programs and solve complex computational problems.* Horizon Quantum Computing Pte. Ltd. announced a $546 million business combination with dMY Squared Technology Group, Inc., a blank-check company. The transaction was announced in September 2025 and includes a private placement (PIPE) of approximately $111.9 million of Horizon Quantum's Class A ordinary shares with institutional and accredited investors, qualified institutional buyers, and strategic investors. The business combination agreement was dated September 9, 2025. A registration statement on Form F-4 became effective on February 17, 2026, and dMY filed a definitive proxy statement/prospectus the same day for a special meeting of shareholders to vote on the business combination.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-024971.txt
- 2026-03-09 · 425 (0001213900-26-024966): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum Holdings develops quantum software infrastructure and programming languages to enable developers to harness quantum computers for solving complex computational problems, positioning itself as a universal operating system layer for quantum computing across multiple hardware platforms.* Horizon Quantum Holdings Pte. Ltd., a quantum software company founded in 2018, announced a business combination with dMY Squared Technology Group, Inc. (a blank-check company) valued at $546 million. The transaction, announced in September 2025, includes a private placement (PIPE) of approximately $111.9 million of Horizon Quantum's Class A ordinary shares with institutional and accredited investors. The business combination agreement was dated September 9, 2025, and the registration statement became effective on February 17, 2026. Horizon Quantum develops quantum software infrastructure and programming languages (including Helium and Beryllium) to enable developers to write hardware-agnostic quantum applications; the company operates its own quantum computing testbed in Singapore.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-024966.txt
- 2026-03-09 · 425 (0001213900-26-024975): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum Computing develops quantum software infrastructure and development tools, including its Triple Alpha integrated development environment, to enable developers to solve computational problems using quantum computing.* Horizon Quantum Computing Pte. Ltd. is pursuing a business combination with dMY Squared Technology Group, Inc., a blank-check company. The transaction includes a private placement (PIPE) of approximately $111.9 million of Horizon Quantum's Class A ordinary shares with institutional and accredited investors. A registration statement on Form F-4 became effective on February 17, 2026, and dMY filed a definitive proxy statement/prospectus the same day. The business combination agreement is dated September 9, 2025. Horizon Quantum's mission is to unlock broad quantum advantage by building software infrastructure and developing advanced quantum software development tools, including its integrated development environment, Triple Alpha.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-024975.txt
- 2026-03-09 · 425 (0001213900-26-025016): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum Computing Pte. Ltd. is a pioneer of software infrastructure for quantum applications, founded in 2018 by Dr. Joe Fitzsimons; it develops advanced software development tools including its integrated development environment, Triple Alpha, enabling developers to write hardware-agnostic quantum programs.* Horizon Quantum Holdings Pte. Ltd. announced expected board appointments and leadership additions following its merger ("Business Combination") with dMY Squared Technology Group, Inc. The company expects to appoint Danielle Lambert (formerly Apple), Peter Oey (Grab CFO), Jill Turner (Broadcom CHRO), and Harry You (dMY Chairman) to its board of directors. Additionally, Catherine Fitzsimons (currently at Fidelity International) will join in May 2026 as Chief Legal and Compliance Officer, EVP of Strategic Initiatives and Company Secretary. The Business Combination Agreement was dated September 9, 2025, and a PIPE Transaction of approximately $111.9 million in Class A ordinary shares is expected to close concurrently.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-025016.txt
- 2026-03-09 · 425 (0001213900-26-024970): 425 - Horizon Quantum Holdings Pte. Ltd. — *Horizon Quantum Computing develops quantum software infrastructure and development tools, including its integrated development environment Triple Alpha, to enable developers to write hardware-agnostic quantum programs.* Horizon Quantum Computing Ltd. and Horizon Quantum Computing Pte. Ltd. are pursuing a previously announced business combination with dMY Squared Technology Group, Inc. (a blank-check company). The transaction includes a private placement (PIPE) of approximately $111.9 million of Horizon Quantum's Class A ordinary shares with institutional and accredited investors. A Form F-4 registration statement was filed and became effective on February 17, 2026, with a definitive proxy statement/prospectus mailed to dMY shareholders on the same date for voting at a special meeting. The business combination agreement is dated September 9, 2025.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-024970.txt
- 2026-03-10 · 425 (0001213900-26-025293): 425 - Horizon Quantum Holdings Ltd. — *Horizon Quantum Holdings Ltd. (formerly Rose Holdco Pte. Ltd.) is a Singapore public company that, through its subsidiary Horizon Quantum Computing Pte. Ltd., develops quantum computing solutions including a quantum processor and the Triple Alpha platform for quantum computing applications.* On March 9, 2026, dMY Squared Technology Group, Inc., Horizon Quantum Holdings Ltd., and Horizon Quantum Computing Pte. Ltd. executed amendments to PIPE Subscription Agreements originally dated December 4, 2025 and March 6, 2026, whereby PIPE investors committed to purchase approximately $111.9 million of Holdco's Class A ordinary shares at the Redemption Price. The Amendment grants PIPE investors a Reduction Right, allowing them to satisfy their PIPE Investment using Currently Owned Shares of dMY Class A common stock or Open-Market Purchase Shares purchased at prices below the Redemption Price, reducing their PIPE share purchase obligations on a one-for-one basis. The Reduction Right must be exercised no later than one Business Day prior to the redemption deadline for dMY's special meeting. Additionally, on March 9, 2026, the parties amended the Side Letter with IonQ, Inc., removing the condition that IonQ's PIPE closing be contingent on entry into a commercial agreement for quantum computing hardware purchases.
  https://www.sec.gov/Archives/edgar/data/2088256/0001213900-26-025293.txt

## Citations
- 0001213900-26-003252 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026003252
- 0001213900-26-005428 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026005428
- 0001213900-26-007873 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026007873
- 0001213900-26-024971 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026024971
- 0001213900-26-024966 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026024966
- 0001213900-26-024975 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026024975
- 0001213900-26-025016 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026025016
- 0001213900-26-024970 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026024970
- 0001213900-26-025293 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000121390026025293