SCHEDULE: Highbridge Capital Discloses 5.3% Stake in Quantumsphere

Highbridge Capital Management LLC has reported a 5.3% beneficial ownership stake in Quantumsphere Acquisition Corp, holding 600,000 ordinary shares.

Summary

• Highbridge Capital Management LLC (Reporting Person) has filed a Schedule 13G, disclosing its beneficial ownership in Quantumsphere Acquisition Corp (Issuer).
• Highbridge beneficially owns 600,000 Ordinary Shares of Quantumsphere Acquisition Corp.
• This ownership represents 5.3% of the Issuer's outstanding Ordinary Shares.
• The percentage is calculated based on an aggregate of 11,406,650 Ordinary Shares outstanding as of September 18, 2025, as reported in the Issuer's Form 10-Q.
• Highbridge Capital Management LLC has sole voting power and sole dispositive power over all 600,000 shares.
• The shares were acquired and are held in the ordinary course of business, not for the purpose of changing or influencing control of the issuer.

Sentiment

Score: 7

Explanation: Highbridge Capital Management LLC's disclosure of a 5.3% beneficial ownership in Quantumsphere Acquisition Corp is a positive indicator of institutional interest. While a Schedule 13G is a passive filing, a substantial stake from a reputable investment adviser can be viewed favorably by the market.

Positives

• Highbridge Capital Management LLC, a significant investment adviser, has taken a substantial 5.3% stake in Quantumsphere Acquisition Corp, potentially signaling confidence in the company's future prospects.

Future Outlook

No forward-looking statements or guidance are provided in this Schedule 13G filing, as it is solely a disclosure of beneficial ownership.

Management Comments

• The securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §§ 240.14a-11.

Industry Context

This filing indicates a significant institutional investor, Highbridge Capital Management, has taken a substantial stake in Quantumsphere Acquisition Corp, a Special Purpose Acquisition Company (SPAC). Such filings are common as institutional investors build positions in public companies, including SPACs, often in anticipation of a de-SPAC transaction or other corporate events.

Comparison to Industry Standards

• Highbridge Capital Management LLC's 5.3% stake is a standard disclosure threshold for institutional investors, triggering a Schedule 13G filing. This level of ownership is typical for active institutional funds taking positions in public companies, including SPACs like Quantumsphere Acquisition Corp.
• The filing itself adheres to SEC regulations for beneficial ownership disclosure, consistent with industry best practices for transparency.

Stakeholder Impact

• Shareholders: Existing shareholders may view the entry of a significant institutional investor like Highbridge Capital Management LLC as a positive development, potentially increasing confidence and liquidity in the stock.

Key Dates

Recommendation

The filing indicates a significant institutional investor has taken a substantial stake, which is generally a positive signal. However, a Schedule 13G is a passive ownership disclosure and does not provide operational or financial performance details of Quantumsphere Acquisition Corp. Without further information on the company's fundamentals, strategic direction, or upcoming events (e.g., a de-SPAC transaction for this SPAC), a 'hold' recommendation is prudent, acknowledging the positive institutional interest while awaiting more comprehensive data for a stronger stance.

Keywords

Quantumsphere Acquisition Corp, Highbridge Capital Management, Schedule 13G, beneficial ownership, ordinary shares, investment adviser, G7387B106