2 unchanged sentences
(b) Not applicable.
−Removed: (c) During the three months ended September 28, 2025, no director or officer adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K.
+Added: (c) During the three months ended March 29, 2026, no director or officer adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K.
Exhibit Number Description of Exhibit
−Removed: Cooperation Agreement, by and among Six Flags Entertainment Corporation, Sachem Head Capital Management, dated as of October 17, 2025.
−Removed: Incorporated herein by reference to Exhibit 10.1 to the Combined Company's Form 8-K (File No.
−Removed: 001-42157) filed on October 17, 2025.
−Removed: Executive Release Agreement, dated October 9, 2025, by and between the Company and Richard Zimmerman.
+Added: Equity Purchase Agreement, dated as of March 5, 2026, between Six Flags Entertainment Corporation, EPR Properties and EP OPCO WOFR, LLC.
+Added: Equity Purchase Agreement, dated as March 5, 2026, between Parc Six Flags Montreal, S.E.C., Funtime, Inc., Six Flags Theme Parks Inc., Six Flags Entertainment Corporation, EPR VC Acquisition, ULC and La Ronde Operations, Inc.
+Added: Indenture, dated as of January 14, 2026, by and among Six Flags Entertainment Corporation, Canada’s Wonderland Company, Millennium Operations LLC, each of the guarantors party thereto and U.S.
+Added: Bank Trust Company, National Association, as trustee.
+Added: Incorporated herein by reference to Exhibit 4.1 to the Company's Form 8-K (File No.
+Added: 001-42157) filed on January 14, 2026.
+Added: Employment Agreement, effective as of March 24, 2026, by and between Six Flags Entertainment Corporation and Richard Haddrill.
+Added: 2024 Omnibus Incentive Plan Form of Restricted Stock Award Agreement and Declaration (Haddrill Version).
+Added: 2024 Omnibus Incentive Plan Form of Performance Stock Unit Award Declaration (Haddrill Version).
+Added: 2024 Omnibus Incentive Plan Form of Short-Term Incentive Plan Award Agreement (2026 Employment Agreement Version).
+Added: Consultant Agreement, dated January 1, 2026, by and between Six Flags Entertainment Corporation and Selim Bassoul.
+Added: Incorporated herein by reference to Exhibit 10.4 (iii) to the Company's Form 10-K (file No.
+Added: 001-42157) filed on February 26, 2026.
Subsidiary Guarantors and Issuers of Guaranteed Securities.
−Removed: Incorporated herein by reference to Exhibit 22 to the Combined Company's Form 10-Q (File No.
+Added: Incorporated herein by reference to Exhibit 22 to the Company's Form 10-Q (File No.
001-42157) filed on November 6, 2024.
3 unchanged sentences
1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
−Removed: 101 The following materials from the Combined Company's Quarterly Report on Form 10-Q for the quarter ended September 28, 2025 formatted in Inline XBRL:
−Removed: (i) the Unaudited Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income, (ii) the Unaudited Condensed Consolidated Balance Sheets, (iii) the Unaudited Condensed Consolidated Statements of Cash Flow, (iv) the Unaudited Condensed Consolidated Statements of Equity, and (v) related notes, tagged as blocks of text and including detailed tags.
−Removed: 104 The cover page from the Combined Company's Quarterly Report on Form 10-Q for the quarter ended September 28, 2025 formatted in Inline XBRL (included as Exhibit 101).
+Added: 101 The following materials from the Company's Quarterly Report on Form 10-Q for the quarter ended March 29, 2026 formatted in Inline XBRL:
+Added: (i) the Unaudited Consolidated Statements of Operations and Comprehensive Loss, (ii) the Unaudited Consolidated Balance Sheets, (iii) the Unaudited Consolidated Statements of Cash Flow, (iv) the Unaudited Consolidated Statements of Equity, and (v) related notes, tagged as blocks of text and including detailed tags.
+Added: 104 The cover page from the Company's Quarterly Report on Form 10-Q for the quarter ended March 29, 2026 formatted in Inline XBRL (included as Exhibit 101).
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
SIX FLAGS ENTERTAINMENT CORPORATION
−Removed: November 7, 2025 /s/ Richard A.
+Added: May 7, 2026 /s/ John Reilly
President and Chief Executive Officer
−Removed: November 7, 2025 /s/ Brian C.
+Added: May 7, 2026 /s/ Brian Witherow
+Added: Brian Witherow
Chief Financial Officer
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.