SCHEDULE: Sio Capital Management Discloses Adagio Medical Stake

Sio Capital Management, LLC has reported a 3.15% ownership stake in Adagio Medical Holdings, Inc. as of June 30, 2026.

Summary

• Sio Capital Management, LLC, an investment adviser, has filed a Schedule 13G, indicating it beneficially owns 698,989 shares of Adagio Medical Holdings, Inc. common stock.
• This ownership stake represents 3.15% of the outstanding common stock as of June 30, 2026.
• Sio Capital Management exercises shared voting and dispositive power over these shares.
• The filing notes that Michael Castor, who controls both Sio Capital Management and Sio GP, LLC, may be deemed to beneficially own these shares.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing. It's a standard disclosure of beneficial ownership by an investment firm, indicating a position without providing operational or financial performance data for the company itself.

Positives

• Sio Capital Management has taken a significant, though not controlling, stake in Adagio Medical Holdings, Inc., which could signal confidence in the company's future prospects.
• The disclosure is made in the ordinary course of business, suggesting no intent to influence or change control of the issuer.

Risks

• The filing does not explicitly detail specific risks, but any investment in a publicly traded company carries inherent market risks.
• Potential for changes in beneficial ownership or voting power by Sio Capital Management or related entities could impact the stock.

Future Outlook

The filing itself does not contain forward-looking statements or guidance from Adagio Medical Holdings. It is a disclosure of ownership by a third-party investment firm.

Management Comments

• "Neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission by the GP or Michael Castor that such person is the beneficial owner of any of the equity securities referred to herein for purposes of Section 13(d) of the Exchange Act, or for any other purpose, and such beneficial ownership is expressly disclaimed."
• "I certify that, to the best of my knowledge and belief, 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

StockSavvy.ai notes that Schedule 13G filings are common for institutional investors accumulating significant stakes in public companies. This filing indicates Sio Capital Management's interest in Adagio Medical Holdings, a development that investors will monitor for potential future actions or influence.

Stakeholder Impact

• Shareholders: The disclosure may lead to increased investor interest in Adagio Medical Holdings, potentially influencing trading activity.
• Management: The filing confirms an institutional investor's significant stake, which may warrant engagement or consideration by the company's board and management.

Next Steps

• Monitor future filings by Sio Capital Management for any changes in their stake.
• Observe Adagio Medical Holdings' corporate actions and financial performance for insights into the company's strategy and value.

Key Dates

Keywords

Adagio Medical Holdings, Sio Capital Management, Schedule 13G, Beneficial Ownership, Investment Adviser, Common Stock, SEC Filing