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Quantumsphere Acquisition Corp (QUMSU) SEC Filings, Aug 2025-Jan 2026

QUMSU NASDAQ

Welcome to our dedicated page for Quantumsphere Acquisition 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.

Our SEC filing database is enhanced with expert analysis from Rhea-AI, providing insights into the potential impact of each filing on Quantumsphere Acquisition's stock performance. Each filing includes a concise AI-generated summary, sentiment and impact scores, and end-of-day stock performance data showing the actual market reaction. Navigate easily through different filing types including 10-K annual reports, 10-Q quarterly reports, 8-K current reports, proxy statements (DEF 14A), and Form 4 insider trading disclosures.

Designed for fundamental investors and regulatory compliance professionals, our page simplifies access to critical SEC filings. By combining real-time SEC filing updates, Rhea-AI's analytical insights, and historical stock performance data, we provide comprehensive visibility into Quantumsphere Acquisition's regulatory disclosures and financial reporting.

Rhea-AI Summary

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.

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Rhea-AI Summary

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.

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Rhea-AI Summary

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.

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Rhea-AI Summary

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.

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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.

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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.

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Form 3 filed for Quantumsphere Acquisition Corp (QUMSU) by Wei Zhang reporting relationship as Director. The event date triggering the filing is 08/05/2025. The form states that no securities are beneficially owned by the reporting person. The filing was signed on 08/11/2025 and was submitted as an initial statement under Section 16.

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Quantumsphere Acquisition Corp. (QUMSU) Form 3 shows that director Gong Qi filed an initial beneficial ownership report related to an 08/05/2025 event and certified on 08/11/2025. The filing states no securities are beneficially owned by the reporting person. This document is a standard Section 16 disclosure that confirms the director currently holds no direct or indirect equity or derivative positions in the issuer.

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Ping Zhang filed an initial Form 3 reporting indirect beneficial ownership of 3,126,650 ordinary shares of Quantumsphere Acquisition Corp (ticker QUMSU) through Whiteowl Holdings LLC, which Ping Zhang controls. The filing states 2,898,000 shares were acquired by Whiteowl before the issuer's IPO and an additional 228,650 ordinary shares are underlying private placement units. The report also discloses 228,650 rights, each exchangeable for one-seventh of one ordinary share, representing 32,664 underlying shares. All holdings are described as indirect and the reporting person serves as Chairman, CEO and CFO and as a Director.

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FAQ

How many Quantumsphere Acquisition (QUMSU) SEC filings are available on StockTitan?

StockTitan tracks 19 SEC filings for Quantumsphere Acquisition (QUMSU), including 10-K annual reports, 10-Q quarterly reports, 8-K current reports, and Form 4 insider trading disclosures. Each filing includes AI-generated summaries, impact scoring, and sentiment analysis.

When was the most recent SEC filing for Quantumsphere Acquisition (QUMSU)?

The most recent SEC filing for Quantumsphere Acquisition (QUMSU) was filed on January 23, 2026.