Six Flags Entertainment Corporation Announces New CEO and Investor Group Developments

Six Flags Entertainment Corporation, the amusement‑park operator listed on the New York Stock Exchange under the ticker FUN, named John Reilly as its new President and Chief Executive Officer on 24 November 2025. The appointment was reported by Seeking Alpha and subsequently highlighted by Finanzen.net in a press‑release‑style update from JANA Partners.

Leadership Change

John Reilly will assume the role of President & CEO, succeeding the former executive team after the company’s rebranding from Cedar Fair, L.P. to Six Flags Entertainment Corporation in July 2024. The leadership shift follows a period of strategic realignment aimed at enhancing operational efficiency across Six Flags’ amusement parks, water parks and resort properties located in the United States, Mexico, and Canada.

Investor Group Activity

JANA Partners, an investment firm founded in 2001 by Barry Rosenstein, announced its approval of the CEO appointment and noted a re‑organization within its investor group. Glenn Murphy has withdrawn from the JANA‑led group to pursue further discussions with the board concerning a potential senior leadership role. Dave Habiger has similarly de‑grouped to explore a separate opportunity involving the company. JANA’s collective economic interest in Six Flags remains approximately 9%.

The firm described its strategy as “investing in undervalued public companies and engaging with management teams and boards to unlock value for shareholders.” No financial terms for the leadership changes were disclosed.

Market Context

Six Flags’ stock closed at $13.45 on 20 November 2025, within a 52‑week range of $12.51 to $49.77. The company’s market capitalization stands at $1.364 billion USD, and its price‑to‑earnings ratio is ‑0.76, indicating negative earnings relative to market value.

A separate feed from feeds.feedburner.com reported that FUN investors have an opportunity to lead a securities‑fraud investigation involving Six Flags Entertainment Corporation. However, the feed does not provide further detail on the allegations or the status of any regulatory action.

Key Takeaways

  • John Reilly appointed President & CEO of Six Flags Entertainment Corporation.
  • JANA Partners endorses the appointment; internal investor group realignment underway.
  • Stock performance remains volatile with a negative P/E ratio.
  • Potential securities‑fraud discussion noted, but no additional context provided.