SCHEDULE: Adagio Medical Holdings Stake Grows to 5.67%

Adage Capital Management, L.P. and its affiliates have increased their beneficial ownership of Adagio Medical Holdings, Inc. common stock to 5.67%.

Summary

• Adage Capital Management, L.P. (ACM) and its affiliates, including Robert Atchinson and Phillip Gross, have reported an increase in their beneficial ownership of Adagio Medical Holdings, Inc. common stock.
• The total beneficial ownership now stands at 1,258,501 shares, representing 5.67% of the company's outstanding common stock.
• This ownership level is based on Adagio Medical Holdings' Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which reported 22,210,459 shares outstanding as of March 23, 2026.

Sentiment

Score: 6

Explanation: StockSavvy.ai views this as a neutral to slightly positive filing, as it indicates increased conviction from an institutional investor but does not contain operational or financial performance data.

Positives

• Increased stake by a significant investment manager, potentially signaling confidence in the company's future prospects.
• Ownership of 5.67% indicates a notable position in the company's shareholder base.

Future Outlook

No specific future outlook or guidance is provided in this Schedule 13G filing, which is primarily an ownership disclosure.

Industry Context

StockSavvy.ai notes that Schedule 13G filings are common for institutional investors accumulating significant stakes in public companies. An increase in beneficial ownership by an investment manager like Adage Capital Management can be interpreted as a positive signal by the market, suggesting the investor sees value or growth potential in Adagio Medical Holdings.

Stakeholder Impact

• Shareholders: The increased stake by Adage Capital Management may be viewed positively, potentially leading to increased investor interest and scrutiny of company performance.
• Management: The company's management will be aware of the significant stake held by Adage Capital Management, which could influence strategic discussions and board-level considerations.

Key Dates

Keywords

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