Horizon Quantum completed its business combination with dMY Squared Technology Group on March 19, 2026, creating the publicly traded company Horizon Quantum Holdings Ltd. Its ordinary shares began trading on the Nasdaq Capital Market under HQ on March 20; warrants began trading as HQWWW. The company reported nearly $120 million in gross proceeds before transaction expenses and said it plans to invest in research and development, a quantum-hardware testbed and its Triple Alpha development environment.
What closed, and when did trading begin?
This was a SPAC business combination between Horizon Quantum Computing Pte. Ltd. and dMY Squared Technology Group, Inc., not a conventional cash acquisition in which one operating company simply bought the other. Following the transaction, the public-company identity became Horizon Quantum Holdings Ltd. The SEC’s Form 8-K reports the legal closing.
- March 17, 2026: dMY shareholders approved the transaction, according to the closing announcement filed with the SEC.
- March 19, 2026: The business combination closed.
- March 20, 2026: The combined company’s shares and warrants began Nasdaq trading, as recorded in the Nasdaq corporate-action notice.
| Security after the combination | Nasdaq symbol | Trading start |
|---|---|---|
| Horizon Quantum Holdings ordinary shares | HQ | March 20, 2026 |
| Horizon Quantum Holdings warrants | HQWWW | March 20, 2026 |
Under the transaction terms, pre-combination dMY shares were exchanged for Horizon Quantum Holdings shares, and dMY warrants were exchanged for Horizon warrants. The warrant symbol identifies a separate security; it is not the ordinary-share ticker.
How much money did the deal provide?
The closing announcement reported nearly $120 million in gross proceeds before transaction expenses. Gross proceeds are not the same as net cash available to the company: expenses, redemptions and transaction financing terms can affect the amount ultimately retained. The headline figure alone does not establish the company’s post-closing cash balance, operating runway or future financing needs. Those questions require the company’s financial statements and subsequent filings.
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The proceeds figure also differs from the approximately $503 million transaction valuation announced when the parties signed their definitive agreement on September 9, 2025. The valuation was a transaction term; the proceeds describe gross cash generated by the closing. Neither figure is a current market capitalization or a measure of the company’s present value. The original valuation appears in the September 2025 SEC-filed announcement.
What is Horizon Quantum building?
Horizon describes its business as software infrastructure for quantum applications. In practical terms, quantum developers must work with different hardware architectures and instruction systems. Software tools can help them express programs, develop and compile them, and connect workflows to quantum systems without treating every device as identical.
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Triple Alpha and the hardware testbed
Horizon presents Triple Alpha as an integrated development environment for quantum software. The company also says it intends to strengthen its hardware testbed, which is part of its effort to develop and test software against quantum systems. The closing release identifies both Triple Alpha and testbed development as priorities for the proceeds.
These aims should not be confused with proof that the platform supports every quantum processor equally, that it has broad commercial adoption, or that it has produced commercially significant quantum advantage. A development environment is software infrastructure; it is not itself a useful quantum application or a solution to the hardware challenges that limit the field.
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What the business case still depends on
The commercial question is whether developers, enterprises or other customers will pay for quantum software tools before large-scale, fault-tolerant quantum computing is broadly available. Horizon’s longer-term ambition is to provide infrastructure for useful, scalable quantum applications, but the timing and commercial value of such applications remain uncertain. The company’s own newsroom describes its platform strategy; company positioning is not independent evidence of product-market fit.
Why use a SPAC, and what does that mean for investors?
A special-purpose acquisition company, or SPAC, is a publicly traded blank-check company formed to combine with an operating business. Horizon combined with dMY Squared rather than listing through a conventional IPO. The route can give a private company access to public markets and transaction capital, but the amount of cash delivered and the ownership split depend on transaction terms, shareholder redemptions, financing and closing conditions.
SPAC transactions can also involve sponsor shares, warrants, earnouts and other securities that affect ownership and potential dilution. The available closing announcement confirms the deal and its headline proceeds, but those figures by themselves do not establish the final pro forma ownership, redemption level, or all potential dilution. Investors should consult the company’s filings for the detailed capitalization and warrant terms rather than infer them from the ticker change.
The closing release also lists risks including scaling the business profitably, competition and employee retention, whether the company’s quantum processor can deliver expected advantages, integrating testbed access into Triple Alpha, and realizing benefits from an agreement or side letter involving IonQ. These are disclosed risks, not findings that any particular outcome has occurred.
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What should shareholders and prospective investors monitor?
A Nasdaq listing makes Horizon’s securities publicly traded; it does not establish that its products have found a durable market. Investors assessing the business can track the following in later company reports and announcements:
- Revenue and customer evidence: Look for reported revenue, customer adoption and repeat business, rather than relying only on product-development claims.
- Cash and spending: Compare cash, operating cash use and research-and-development spending in financial filings to understand funding needs and runway.
- Product progress: Watch for specific Triple Alpha releases, availability and evidence of developer or enterprise use.
- Testbed and hardware relationships: Look for concrete progress on the testbed and disclosed partnerships, while distinguishing access or agreements from demonstrated technical results.
- Share count and warrants: Review filings for new share issuance, warrant exercises and other changes that can affect ownership.
- Nasdaq compliance: Continued listing depends on meeting applicable exchange requirements, a risk identified in the SEC-filed closing release.
For transaction terms and financial disclosures, start with the SEC closing Form 8-K and later filings. The company’s investor news releases provide its announcements, while the Nasdaq notice records the security symbols and trading date.
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