SCHEDULE: Citadel Discloses 5.4% Stake in HCM II Acquisition Corp.

Citadel entities and Kenneth Griffin have disclosed beneficial ownership of 5.4% of HCM II Acquisition Corp.'s Class A Ordinary Shares.

Summary

• Citadel Advisors LLC, Citadel Advisors Holdings LP, and Citadel GP LLC collectively beneficially own 1,012,171 Class A Ordinary Shares, representing 4.4% of the outstanding class.
• Citadel Securities LLC, Citadel Securities Group LP, and Citadel Securities GP LLC collectively beneficially own 221,472 Class A Ordinary Shares, representing 1.0% of the outstanding class.
• Kenneth Griffin, through his control over the various Citadel entities, beneficially owns an aggregate of 1,233,643 Class A Ordinary Shares, constituting 5.4% of the outstanding class.
• All reported shares are held with shared voting and shared dispositive power among the respective reporting persons.
• The percentages are based on 23,000,000 Class A Ordinary Shares outstanding as of August 12, 2025, as reported in the issuer's Form 10-Q.
• The reporting persons state that the securities were not acquired or held for the purpose of changing or influencing the control of HCM II Acquisition Corp.

Sentiment

Score: 5

Explanation: The filing is a factual disclosure of beneficial ownership and does not contain information that inherently suggests a positive or negative sentiment regarding the issuer's performance or prospects. It is a neutral regulatory compliance document.

Future Outlook

This filing does not contain any forward-looking statements or guidance from HCM II Acquisition Corp. or the reporting persons regarding the issuer's future performance.

Industry Context

This Schedule 13G filing indicates a significant passive investment by Citadel, a prominent global investment firm, in HCM II Acquisition Corp., a special purpose acquisition company (SPAC). Such filings are standard disclosures when an entity's beneficial ownership in a public company crosses the 5% threshold, providing transparency to the market about major shareholders. It reflects Citadel's investment strategy in the SPAC market.

Stakeholder Impact

• Shareholders: Provides transparency regarding significant institutional ownership, potentially influencing market perception and liquidity.
• Regulatory Bodies: Ensures compliance with SEC disclosure requirements for beneficial ownership.

Key Dates

Keywords

HCM II Acquisition Corp., Citadel, Kenneth Griffin, Beneficial Ownership, Schedule 13G, Class A Ordinary Shares, Investment Management, Hedge Fund