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IPO filing research
Horizon Quantum Holdings Ltd.
Services-Computer Programming Services · HQ
follow-on
trading
priced
Nasdaq
424B3
Horizon Quantum Holdings Ltd. IPO research page with SEC filing history, offering status, deal terms, structured filing extracts, company news, and comparable IPO context. Latest filing: 424B3 on 2026-04-24. Current deal snapshot: exchange Nasdaq.
Filing Timeline
SEC EDGAR
424B3
priced
Final prospectus
Final prospectus filed near launch with final deal terms.
Follows 425 and confirms the priced prospectus.
52,966,280 shares
Class A · Exchange Nasdaq · Ticker HQ · 6,044,160 warrants exercisable at $11.50 per warrant · Selling stockholders only · Use of proceeds Proceeds from warrant exercises, if any, will be used for general corporate purposes · Flags foreign_private_issuer, warrants
Horizon Quantum Holdings Ltd. is registering up to 6,044,160 Class A ordinary shares issuable upon warrant exercises and 52,966,280 Class A shares for resale by selling securityholders. The filing includes shares from warrant conversions, private placements, and existing holdings, with no proceeds going to the company except from warrant exercises. The offering relates to securities previously issued in a business combination with dMY Squared Technology Group, Inc.
2026-04-24 · 0001213900-26-047285
EFFECT
effective
SEC effectiveness notice
SEC declared the registration statement effective, allowing the offering to proceed.
First tracked pre-IPO filing for this issuer.
Horizon Quantum Holdings Ltd. filed a Notice of Effectiveness for its Form F-1 registration statement on April 23, 2026, marking the activation of its IPO. The filing outlines the resale of up to 52,966,280 Class A ordinary shares and 6,044,160 warrants by selling securityholders, including shares from private placements and conversions. The company will not receive proceeds from these sales, only from warrant exercises if shares trade above $11.50. The filing also references a prior F-4 registration statement and includes details about market risks tied to large-scale resale.
2026-04-23 · 9999999995-26-001318
F-1
filed
Initial foreign registration statement
Initial public filing for a foreign issuer submitted to start the SEC review process.
First tracked pre-IPO filing for this issuer.
52,966,280 shares
Class A · Exchange Nasdaq · Ticker HQ · Warrants exercisable at $11.50 per share · Selling stockholders only · Use of proceeds No proceeds to the company; selling shareholders resell shares · Flags dual_class, warrants
Horizon Quantum Holdings Ltd. is registering up to 6,044,160 Class A ordinary shares and 2,884,660 warrants for resale by selling securityholders, including shares from a business combination with dMY Squared Technology Group. The filing includes details on the resale of 52,966,280 Class A shares, potential warrant exercises, and risks related to market volatility and lack of proceeds to the company. The company is an emerging growth company with no immediate proceeds from the resale, and the offering is tied to prior private placements and conversions.
2026-04-16 · 0001213900-26-044735
20-F
supplemental
20-F
Pre-IPO filing captured from the SEC submission timeline.
First tracked pre-IPO filing for this issuer.
Horizon Quantum Holdings Ltd. filed its 20-F annual report for the fiscal year ended December 31, 2025, following its business combination with dMY Squared Technology Group, Inc. The report details the completion of the merger, share conversions, and waivers under Singapore regulatory requirements. The company operates as a public entity post-merger, with updated capital structure and governance details.
2026-04-14 · 0001213900-26-043585
20-F
supplemental
20-F
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. completed a business combination with dMY Squared Technology Group, Inc., resulting in the conversion of Horizon's shares into Company Ordinary Shares and the assumption of dMY's warrants. The company raised capital through a PIPE private placement and commenced trading on Nasdaq. The filing reflects the post-merger structure, including share conversions, warrant exchanges, and the company's transition to a publicly listed entity.
2026-03-25 · 0001213900-26-034058
CERT
inactive
CERT
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
The current filing is a CERT form for Horizon Quantum Holdings Ltd., indicating a registration statement for securities. The previous filing was an 8-A12B, which registered Class A ordinary shares and warrants. The current filing likely reflects updates or changes in the securities being registered, though specific details are obscured in the provided text.
2026-03-19 · 0001354457-26-000270
8-A12B
effective
Exchange Act registration
Registration filed to list the securities under the Exchange Act ahead of trading.
Follows EFFECT and registers the class of securities for exchange listing.
Horizon Quantum Holdings Ltd. filed Form 8-A12B to register Class A ordinary shares and warrants for listing on Nasdaq. The filing incorporates by reference disclosures from a prior F-4 registration statement, including details about the company's securities structure and business combination with Horizon Quantum Computing Ltd. No exhibits are required as the registration does not involve Section 12(g) securities or additional listings.
2026-03-19 · 0001213900-26-031619
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
The current filing is a transcript of a podcast interview discussing dMY Squared Technology Group's business combination with Horizon Quantum Holdings Ltd. It highlights the SPAC's strategy, the background of key figures like Harry You (dMY Chairman) and Joe Fitzsimons (Horizon CEO), and the significance of Horizon as a first-to-market quantum software company. The interview emphasizes strategic partnerships, low capital burn rates, and the team's experience in tech M&A, including the VMware acquisition. Previous filings focused on formal announcements of the business combination and regulatory disclosures.
2026-03-11 · 0001213900-26-026232
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. announced milestones in its business and transaction progress with dMY Squared Technology Group, Inc., including an oversubscribed PIPE financing and new board appointments. A press release details advancements in quantum computing infrastructure and prepares for the business combination closing.
2026-03-10 · 0001213900-26-025528
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. and its affiliates filed a Form 425 disclosing updates to their business combination with dMY Squared Technology Group, Inc. The filing includes details about the PIPE transaction, amendments to the Side Letter with IonQ, and the effective date of the Registration Statement. It also highlights risks related to the completion of the merger, regulatory approvals, and forward-looking statements.
2026-03-10 · 0001213900-26-025448
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. filed a Form 425 disclosing amendments to its PIPE Subscription Agreements and a Side Letter with IonQ, Inc. The amendments allow PIPE investors to satisfy their investments using existing or open-market purchased dMY shares, reducing required PIPE share purchases. The Side Letter with IonQ removed conditions tied to a commercial agreement. The filing also references ongoing preparations for the Business Combination with dMY, including shareholder approvals and regulatory filings.
2026-03-10 · 0001213900-26-025293
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. announced expected new board members and a Chief Legal Officer as part of its pre-IPO preparations following its merger with dMY Squared Technology Group, Inc. The filing highlights key leadership additions and underscores the company's transition to public status via a business combination agreement.
2026-03-09 · 0001213900-26-025016
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. has updated its 425 filing regarding its business combination with dMY Squared Technology Group, Inc. The filing includes details about the effective registration statement, proxy statement, and ongoing developments related to the merger. Key elements include the PIPE transaction, regulatory approvals, and risks associated with the combination.
2026-03-09 · 0001213900-26-024975
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 424B3 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. is advancing its business combination with dMY Squared Technology Group, Inc. through a SPAC merger, aiming to list as the first quantum software company. The filing includes a podcast transcript discussing the development of a universal quantum operating system, challenges in error correction, and the potential of quantum computing to mirror classical computing's growth. Key themes include the strategic importance of software in quantum tech, partnerships with hardware providers, and the role of SPACs in accelerating public market access for emerging technologies.
2026-03-09 · 0001213900-26-024971
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows EFFECT in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. filed a Form 425 related to its business combination with dMY Squared Technology Group, Inc. The filing includes details about the Registration Statement, Proxy Statement, and forward-looking statements regarding the transaction. It highlights the company's mission to develop quantum software infrastructure and outlines risks associated with the merger, including regulatory approvals and operational challenges.
2026-03-09 · 0001213900-26-024970
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 424B3 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. is advancing its strategic partnership with dMY Squared Technology Group Inc. through a $546 million business combination, focusing on developing a universal quantum computing operating system. The SPAC Insider podcast highlights the company's efforts to address quantum error correction challenges and position software as a critical layer in the quantum computing stack, drawing parallels to historical tech transitions like classical computing. The discussion emphasizes the potential for software-driven value creation amid evolving hardware landscapes.
2026-03-09 · 0001213900-26-024966
424B3
priced
Final prospectus
Final prospectus filed near launch with final deal terms.
Follows F-4/A and confirms the priced prospectus.
Price $11.81 · 44,119,878 shares · Gross proceeds $111,862,500
Class A and Class B Ordinary Shares · 6,044,160 warrants · Use of proceeds Proceeds will be used for business combination and working capital
Horizon Quantum Holdings Ltd. updates its proxy statement/prospectus for a business combination involving DMY Squared Technology Group, Inc., Horizon Quantum Computing Pte. Ltd., and related entities. Key updates include an increased estimated redemption price per public share to $11.81, additional PIPE investment of $1.45 million, expanded SAFE financing to $8.384 million, new executive appointments, and a waiver of Singapore takeover rules. The filing also details revised exchange ratios, redemption conditions, and regulatory considerations.
2026-03-06 · 0001213900-26-024748
EFFECT
effective
SEC effectiveness notice
SEC declared the registration statement effective, allowing the offering to proceed.
Follows DRS and marks the registration effective.
Horizon Quantum Holdings Ltd. filed a Notice of Effectiveness for its Form F-4 registration statement, confirming the effectiveness of its securities offering. The filing outlines the company's conversion from a Singapore private company to a public company, the amalgamation of subsidiaries, and a business combination involving dMY Squared Technology Group, Inc. The offering includes up to 24,166,557 Class A shares, 19,953,321 Class B shares, and 6,044,160 warrants, with potential conversions and exercises of warrants. The registration statement also includes a resale prospectus for securities held by a selling securityholder.
2026-02-17 · 9999999995-26-000609
424B3
priced
Final prospectus
Final prospectus filed near launch with final deal terms.
Follows 425 and confirms the priced prospectus.
Class A and Class B Ordinary Shares · 6,044,160 warrants issuable upon conversion and exercise · Use of proceeds Proceeds from the business combination and SPAC merger · Flags dual_class, warrants
Horizon Quantum Holdings Ltd. is undergoing a business combination involving the conversion of its parent company, Holdco, from a Singapore private to public company, amalgamation with Horizon Quantum Computing Pte. Ltd., and a SPAC merger with DMY Squared Technology Group, Inc. The transaction involves share exchanges, conversion of preferred shares and SAFEs, and issuance of Class A and B ordinary shares, warrants, and options. The filing outlines the structure, exchange ratios, and conditions for closing, including cash requirements and regulatory approvals.
2026-02-17 · 0001213900-26-017455
F-4/A
amended
F-4/A
Pre-IPO filing captured from the SEC submission timeline.
Updates the prior 425 filing.
42,964,038 shares
Class A, Class B · 6,044,160 Holdco Warrants exercisable for Class A Ordinary Shares · Use of proceeds To facilitate the business combination and related transactions · Flags dual_class, warrants
Horizon Quantum Holdings Ltd. is undergoing a business combination involving dMY Squared Technology Group, Inc., including the conversion from a Singapore private company to a public company. The filing outlines the issuance of up to 24,166,557 Class A shares, 19,953,321 Class B shares, and 6,044,160 warrants, along with the amalgamation of subsidiaries and a SPAC merger. The registration statement includes a primary offering and resale prospectus, with details on share conversions, warrants, and the company's quantum computing initiatives.
2026-01-30 · 0001213900-26-009801
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows F-4 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. discusses its quantum computing initiatives, including the development of a hardware testbed and $2.6M investment in its quantum computer. The company emphasizes software-hardware integration, partnerships with hardware providers, and plans to expand its team in Singapore. The filing also outlines the business combination with dMY Squared Technology Group, Inc., highlighting the timeline for quantum applications (2-4 years) and risks related to scalability, regulatory approvals, and market adoption.
2026-01-27 · 0001213900-26-007873
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. focuses on developing software infrastructure to bridge classical and quantum computing, enabling practical quantum applications. The company emphasizes hardware-agnostic solutions, advances in quantum error correction, and overcoming software challenges like abstraction and quantum interference. The CEO highlights progress in quantum hardware and the need for scalable software to unlock real-world value.
2026-01-20 · 0001213900-26-005428
F-4
filed
F-4
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. is undergoing a business combination involving a merger with dMY Squared Technology Group, Inc., and an amalgamation with Horizon Quantum Computing Pte. Ltd. The registration statement outlines the conversion of Horizon Quantum Holdings Pte. Ltd. from a Singapore private company to a public company, issuance of Class A and Class B ordinary shares, warrants, and the structure of the merger. The filing includes details on share conversions, exchange ratios, and the terms of the business combination, including the rights of shareholders and the role of the Horizon Founder.
2026-01-14 · 0001213900-26-004420
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Holdings Ltd. (formerly Rose Holdco Pte. Ltd.) is involved in a business combination agreement with dMY Squared Technology Group, Inc. The filing includes a presentation for the proposed merger, with plans to submit a registration statement on Form F-4. The transaction remains subject to regulatory approvals and shareholder votes. The previous filing focused on the launch of Horizon's quantum programming language, Beryllium.
2026-01-12 · 0001213900-26-003252
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Computing Pte. Ltd. announced the launch of Beryllium, a hardware-agnostic, object-oriented programming language for quantum computers, as part of its software infrastructure roadmap. The filing confirms ongoing progress toward a business combination with dMY Squared Technology Group, Inc., including updates on regulatory filings and partnerships. The company also highlighted advancements in its Triple Alpha development environment and planned previews at industry events.
2025-12-09 · 0001213900-25-119427
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
The current filing details the execution of Subscription Agreements (PIPE Financing) by Rose Holdco Pte. Ltd., dMY Squared Technology Group, Inc., and Horizon Quantum Computing Pte. Ltd., involving $110 million in private placements of Holdco's Class A shares. A Side Letter with IonQ, Inc. outlines director nominations, lock-up agreements, and conditions tied to the Business Combination. The filing emphasizes the alignment of the PIPE Financing with the Business Combination, subject to regulatory and shareholder approvals.
2025-12-05 · 0001213900-25-118468
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows DRS in the pre-IPO sequence.
The current filing reports that Horizon Quantum Computing completed the assembly and integration of its first quantum computer, marking a key milestone in its technological development. dMY Squared Technology Group, Inc. continues advancing its business combination with Rose Holdco Pte. Ltd. and Horizon Quantum, having filed a registration statement on Form F-4 for the transaction. The filing emphasizes ongoing regulatory processes and risks associated with the merger.
2025-12-03 · 0001213900-25-117618
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
Follows 425 in the pre-IPO sequence.
Horizon Quantum Computing Pte. Ltd. (Horizon) and dMY Squared Technology Group, Inc. (dMY) announced the confidential submission of a draft registration statement on Form F-4 with the SEC, signaling progress toward their business combination. The transaction, initially disclosed on September 9, 2025, involves merging dMY with Horizon and Rose Holdco Pte. Ltd. (Holdco). Upon completion, Holdco will rebrand as Horizon Quantum Holdings Ltd., and its securities are expected to list on Nasdaq under symbols HQ and HQW. The filing includes a preliminary proxy statement and prospectus, with shareholder approvals and SEC clearance required for closing.
2025-10-22 · 0001213900-25-101214
DRS
filed
Draft registration statement
Draft registration filed confidentially before the public launch.
First tracked pre-IPO filing for this issuer.
Horizon Quantum Holdings Ltd. (formerly Rose Holdco Pte. Ltd.) is undergoing a business combination involving a merger with dMY Squared Technology Group, Inc. and Horizon Quantum Computing Pte. Ltd. The transaction includes converting Rose Holdco from a private to a public company, amalgamating with Horizon, and merging with dMY via a SPAC structure. The filing outlines share conversions, warrant exchanges, and dual-class share structures, with details on the issuance of up to 27.9 million Class A shares, 20.2 million Class B shares, and 6.0 million warrants. The process involves regulatory approvals and shareholder votes.
2025-10-21 · 0001213900-25-100898
425
supplemental
425
Pre-IPO filing captured from the SEC submission timeline.
First tracked pre-IPO filing for this issuer.
dMY Squared Technology Group, Inc. filed a Form 8-K disclosing a business combination agreement with Rose Holdco Pte. Ltd. and Horizon Quantum Computing Pte. Ltd., including a presentation for investor communication. The filing outlines the proposed transaction, regulatory filings, and risks associated with the combination, while noting that the information is for informational purposes and not an offer for securities.
2025-10-14 · 0001213900-25-098707
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Recent News
No recent news stored for this issuer.