Welcome to our dedicated page for QUANTUMSPHERE ACQUISITION CO SEC filings (Ticker: QUMSU), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
The SEC filings page for Quantumsphere Acquisition Corporation (QUMSU) provides access to the company’s regulatory disclosures as a Nasdaq‑listed special purpose acquisition company. Quantumsphere is a Cayman Islands exempted blank check company formed to complete a business combination with one or more businesses, and its filings reflect both its SPAC structure and its transaction activity.
Key documents include current reports on Form 8‑K, such as the filing describing the commencement of separate trading for its units, ordinary shares, and rights on the Nasdaq Global Market. That 8‑K details the listing of units under QUMSU and the expected trading of ordinary shares and rights under QUMS and QUMSR, along with instructions for holders who wish to separate their units.
As Quantumsphere pursues a proposed business combination with SACH Pte. Ltd. and related entities, additional filings are expected to include a registration statement on Form F‑4 containing a proxy statement/prospectus for Quantumsphere shareholders. These materials are intended to describe the transaction structure, the parties involved, and the risks associated with the merger, and they form the basis for shareholder voting on the business combination.
On Stock Titan, Quantumsphere’s SEC filings are updated in step with the EDGAR system and are accompanied by AI‑generated summaries that explain the purpose and key points of each document. Users can review 8‑K current reports, registration statements, and other submissions to understand developments such as security listings, transaction announcements, and governance matters, without having to parse every technical detail themselves.
Quantumsphere Acquisition Corporation reported net income of
Following its August 2025 IPO of 8,280,000 units at
On October 3, 2025, Quantumsphere signed a Merger Agreement to combine with SACH Pte. Ltd. in an all‑stock Business Combination that values SACH at approximately
Management notes substantial doubt about the company’s ability to continue as a going concern because it must complete a Business Combination by
Highbridge Capital Management filed an amended ownership report for Quantumsphere Acquisition Corp ordinary shares. The firm now reports beneficial ownership of 0 shares, representing 0% of the class as of December 31, 2025, with no sole or shared voting or dispositive power.
The filing notes that any securities referenced were acquired and held in the ordinary course of business and not for the purpose of changing or influencing control of the company.
Quantumsphere Acquisition Corporation filed a notice that it will be late in submitting its Quarterly Report on Form 10-Q for the quarter ended December 31, 2025. The company says it could not meet the smaller reporting company deadline of February 17, 2026 without unreasonable effort or expense because of delays in completing the financial statements.
The company states that it anticipates filing this Form 10-Q no later than the seventh calendar day after the prescribed filing date, indicating the delay is expected to be short-term and tied specifically to finalizing its quarterly financial information.
Mizuho Financial Group, Inc. has filed a Schedule 13G reporting a passive ownership stake in Quantumsphere Acquisition Corporation. The firm beneficially owns 718,086 common shares, representing 6.3% of the class as of the event date of 12/31/2025.
Mizuho reports sole power to vote and dispose of all 718,086 shares, with no shared voting or dispositive power. The filing notes that Mizuho Financial Group, Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of equity securities directly held by their wholly owned subsidiary, Mizuho Securities USA LLC, and certifies that the shares are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.
Quantumsphere Acquisition Corporation reported that its business combination target, SACH Pte. Ltd., raised new equity financing in connection with their pending merger. On January 13, 2026, SACH Pte. Ltd. entered into a subscription agreement with Cypress Innovations Limited for 2,055 ordinary shares at $973.16 per share, providing gross proceeds of $2,000,000. On the same date, SACH Pte. Ltd. signed a separate subscription agreement with an individual investor for 103 ordinary shares at $973.16 per share, for gross proceeds of $100,000. These subscriptions support SACH Pte. Ltd.’s ongoing financing activities ahead of the planned business combination, and no securities of Quantumsphere Acquisition Corporation were issued in either transaction.
Quantumsphere Acquisition Corporation filed a current report explaining that its units, which each consist of one ordinary share and one right, will begin separate trading. Starting on or about September 30, 2025, holders of units may elect to trade the ordinary shares and the rights independently.
Units will continue to trade on the Nasdaq under the symbol QUMSU. Any separated ordinary shares are expected to trade under QUMS, and the separated rights are expected to trade under QUMSR. Holders who want to separate their units must have their brokers contact Continental Stock Transfer & Trust Co., the company’s transfer agent. The company also issued a press release, attached as an exhibit, announcing the start of separate trading.
Quantumsphere Acquisition Corp (QUMSU) completed an IPO offering 8,280,000 Units at $10.00 each, generating gross proceeds of $82,800,000, and sold 228,650 Private Units to its Sponsor for $2,286,500. The Units consist of one ordinary share and one right, and 8,280,000 public ordinary shares issued with rights were recorded as temporary equity at $10 per share. The Sponsor holds 2,898,000 founder shares after adjustments, and 1,080,000 over-allotment Units were fully exercised.
The Company reported substantial offering-related costs of $4,459,070, a working capital deficit of $212,441, outstanding promissory notes repaid at IPO closing, and commitments including finder fees up to $3,500,000. Management states there is substantial doubt about the Company’s ability to continue as a going concern absent completing a business combination by February 6, 2027 or raising additional capital.
Whiteowl Holdings LLC reported beneficial ownership of 3,126,650 Class A ordinary shares of Quantumsphere Acquisition Corp, representing approximately 27.41% of outstanding shares. The position comprises 2,898,000 founder shares (with 378,000 subject to forfeiture if the underwriters' over-allotment option is not exercised in full) and 228,650 ordinary shares issued as Private Placement Units purchased at $10.00 per unit. The Sponsor purchased the Placement Units for $2,286,500 from working capital and holds certain voting and lock-up commitments in favor of any proposed business combination. On July 25, 2025, 83.13% of the Sponsor's interest was transferred to Wealthwise Solutions LTD, making it the Sponsor's majority holder.
Quantumsphere Acquisition Corp director reports no share ownership. Daniel M. McCabe, a director of the company, filed an initial insider ownership statement indicating that he does not beneficially own any non-derivative or derivative securities of Quantumsphere Acquisition Corp as of the reported event date.
Whiteowl Holdings LLC reported direct ownership of 3,126,650 ordinary shares of Quantumsphere Acquisition Corp (QUMSU) and beneficial interest in rights equivalent to 32,664 ordinary shares.
The filing states the holdings include 2,898,000 shares acquired prior to the issuer's initial public offering and 228,650 ordinary shares underlying private placement units. Each right is exchangeable for one-seventh of one ordinary share. The form notes that, after the underwriter's full exercise of its over-allotment option to purchase 1,080,000 units on August 7, 2025, no such shares are subject to forfeiture. The event date is 08/05/2025 and the Form 3 was signed by Ping Zhang, Managing Member, on 08/11/2025.