Results of Operations and Financial Condition. On August 6, 2026, Six Flags Entertainment Corporation issued a news release disclosing 2026 fiscal second-quarter results. A copy of the news release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. This information shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise be subject to the liabilities of that section, nor shall it be deemed incorporated by refer…

Chief Operating Officer — Tim Fisher: Tim Fisher is departing from the role of Chief Operating Officer but will remain as a Special Advisor until December 15, 2026.

Tim Fisher: The amendment to the employment agreement extends certain benefits for Tim Fisher through December 15, 2026.

Chief Financial Officer — Ash Walia: The company appointed Ash Walia as the new Chief Financial Officer from an external position.

The excerpt is incomplete and does not provide specific details about any management change.

Entry into a Material Definitive Agreement. On May 19, 2026, Six Flags Entertainment Corporation (the “Company”) entered into a Cooperation Agreement (the “Cooperation Agreement”) with H Partners Management, LLC (“H Partners”), pursuant to which Rehan Jaffer, Founder and Managing Member of H Partners, will be appointed to the board of directors of the Company (the “Board”) following the 2026 Annual Meeting of Stockholders on May 26, 2026 (the “2026 Annual Meeting”), replacing Arik Ruchim, who…

Results of Operations and Financial Condition. On May 7, 2026, Six Flags Entertainment Corporation issued a news release disclosing 2026 fiscal first-quarter results. A copy of the news release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. This information shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise be subject to the liabilities of that section, nor shall it be deemed incorporated by reference…

Chief Financial Officer, Chief Legal and Compliance Officer — Brian Witherow, Brian Nurse: The CFO and Chief Legal and Compliance Officer departed the company without a permanent successor named.

Regulation FD Disclosure. On April 8, 2026, Six Flags Entertainment Corporation (the “ Company ”) announced that its subsidiary Six Flags America Property Corporation, entered into a purchase agreement to sell certain real property located in Prince George’s County, Maryland, to a joint venture between 35V, the investment firm co-founded by NBA champion Kevin Durant and Rich Kleiman, and Atlanta-based TPA Group (the “ Transaction ”). The Transaction is subject to buyer’s diligence and other c…

Executive Chair of the Board — Richard Haddrill: Richard Haddrill was appointed as the Executive Chair of the Board and will also serve as a Class II director.

Director — Jennifer Mason: Ms. Mason will not stand for re-election at the 2026 Annual Meeting.

Entry into a Material Definitive Agreement. On March 5, 2026, Six Flags Entertainment Corporation (the “ Company ”) entered into that certain Equity Purchase Agreement (the “ Purchase Agreement ”) with EPR Properties, a Maryland real estate investment trust (“ Buyer ”), and EP OPCO WOFR, LLC, a Delaware limited liability company (the “ Operator ”). Pursuant to the terms of the Purchase Agreement, and subject to the terms and conditions set forth therein, the Company has agreed to sell to Buye…

Results of Operations and Financial Condition. On February 19, 2026, Six Flags Entertainment Corporation issued a news release disclosing 2025 fiscal fourth-quarter results. A copy of the news release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. This information shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise be subject to the liabilities of that section, nor shall it be deemed incorporated by re…

Entry into a Material Definitive Agreement. On January 21, 2026, Six Flags Entertainment Corporation (the “ Company ”) entered into an amendment (the “ Amendment ”) to the cooperation agreement (the “ Cooperation Agreement ”) with Dendur Capital LP and certain of its affiliates (together, “ Dendur ”), dated March 10, 2025. The following is a summary of the material terms of the Amendment. The summary does not purport to be complete and is qualified in its entirety by reference to the Amendmen…

Entry into a Material Definitive Agreement. Issuance of Senior Notes due 2032 On January 14, 2026, Six Flags Entertainment Corporation (the “Company,” “we,” “us” or “Six Flags”), Canada’s Wonderland Company (“Cedar Canada”) and Millennium Operations LLC (“Millennium Operations” and, together with Cedar Canada, the “Subsidiary Co-Issuers” and, together with Six Flags and Cedar Canada, the “Co-Issuers”) closed its previously announced private offering (the “Offering”) of $1,000,000,000 aggregat…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information in

Regulation FD Disclosure. Senior Notes Offering On January 6, 2026, Six Flags Entertainment Corporation (the “Company,” “we,” “us” or “Six Flags”) issued a press release announcing that it has commenced an offering (the “Offering”) of $1,000,000,000 aggregate principal amount of senior notes due 2032 (the “Notes”) in transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). The proceeds from the Offering, together with cash on hand, will be use…

Selim Bassoul: The filing discloses a new consulting agreement for advisory services, not the departure, appointment, or election of a senior officer or director.

Director — Louis Carr: The filing discloses the resignation of a single director, which is a standard board composition change rather than a loss of a senior executive officer.

CEO — John Reilly: The filing announces the appointment of an external candidate, John Reilly, as the new CEO to succeed the retiring Richard Zimmerman, representing a planned succession rather than a sudden loss.

Results of Operations and Financial Condition. On November 7, 2025, Six Flags Entertainment Corporation issued a news release disclosing 2025 fiscal third-quarter results. A copy of the news release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. This information shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise be subject to the liabilities of that section, nor shall it be deemed incorporated by refe…

Director — Mr. Brudnick: Mr. Brudnick was appointed to the Board and to the Nominating and Governance Committee as part of a Cooperation Agreement.

Entry into a Material Definitive Agreement. On October 17, 2025, Six Flags Entertainment Corporation (the “Company”) entered into a Cooperation Agreement (the “Cooperation Agreement”) with Sachem Head Capital Management LP (“Sachem Head”). Pursuant to the Cooperation Agreement, the board of directors of the Company (the “Board”) (i) increased the size of the Board from twelve (12) to thirteen (13) directors, (ii) appointed Jonathan Brudnick to the Board as a Class III director, with a term ex…

Executive Chairman and Director — Selim Bassoul: Selim Bassoul will step down as Executive Chairman and Director, with a named successor.

CEO — Richard Zimmerman: The CEO is stepping down in an orderly transition without cause, with a search process initiated to find a successor, indicating a planned succession rather than a sudden loss.