SIX / Six Flags Entertainment Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Six Flags Entertainment Corporation
US ˙ NYSE ˙ US83001A1025
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
LEI 549300JYTDUAA4JQ3717
CIK 701374
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Six Flags Entertainment Corporation
SEC Filings (Chronological Order)
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July 12, 2024 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-13703 SIX FLAGS ENTERTAINMENT CORPORATION (Exact name of registrant as s

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on July 15, 2024, pursuant to the provisions of Rule 12d2-2 (a).

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 2, 2024 S-8 POS

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 Registration Nos.

July 1, 2024 EX-99.1

Six Flags Entertainment Corporation – 8701 Red Oak Boulevard, Charlotte, NC 28217 – Phone: 704.414.4700

Exhibit 99.1 NEWS RELEASE CEDAR FAIR AND SIX FLAGS MERGER OF EQUALS SUCCESSFULLY COMPLETED, CREATING A LEADING AMUSEMENT PARK OPERATOR CHARLOTTE, North Carolina (July 1, 2024) – Six Flags Entertainment Corporation (NYSE: FUN), the largest and most diverse amusement park operator in North America, today announced the successful completion of the merger of equals (the “Merger”) between Cedar Fair, L

July 1, 2024 8-K

Regulation FD Disclosure, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 1, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

July 1, 2024 EX-10.1

AMENDMENT NO. 2 TO THE COOPERATION AGREEMENT

Exhibit 10.1 AMENDMENT NO. 2 TO THE COOPERATION AGREEMENT This Amendment No.2 (this “Amendment”) is entered into and effective as of July 1, 2024, by and among Six Flags Entertainment Corporation (the “Company”) and the persons and entities set forth on Schedule A hereto (the “H Partners Group,” and, for clarity and as applicable, including each member thereof acting individually). Capitalized ter

June 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 26, 2024 Six Flags Entertainmen

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 26, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 26, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 26, 2024 Six Flags Entertainmen

Filed by CopperSteel Hold Co, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No. 333-276255 Date: June 26, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15

June 26, 2024 EX-99.1

Cedar Fair and Six Flags Announce the Satisfaction of Regulatory Conditions for the Proposed Merger of Equals

EX-99.1 Exhibit 99.1 Cedar Fair and Six Flags Announce the Satisfaction of Regulatory Conditions for the Proposed Merger of Equals SANDUSKY, Ohio and ARLINGTON, Texas-(June 26, 2024)- Cedar Fair, L.P. (NYSE: FUN) (“Cedar Fair”) and Six Flags Entertainment Corporation (NYSE: SIX) (“Six Flags”) today announced that the regulatory conditions for their previously announced merger of equals (the “Merge

June 26, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 26, 2024 Six Flags Entertainmen

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: June 26, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 26, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 18, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 18, 2024 Six Flags Entertainmen

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 18, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 18, 2024 EX-99.1

Cedar Fair and Six Flags Announce Anticipated Closing Date of the Mergers and Six Flags’ Related Special Dividend

Exhibit 99.1 Cedar Fair and Six Flags Announce Anticipated Closing Date of the Mergers and Six Flags’ Related Special Dividend SANDUSKY, Ohio and ARLINGTON, Texas-(June 18, 2024)- Cedar Fair, L.P. (NYSE: FUN) (“Cedar Fair”) and Six Flags Entertainment Corporation (NYSE: SIX) (“Six Flags”), today announced that they notified the New York Stock Exchange (“NYSE”) that the closing of Cedar Fair and Si

June 18, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 18, 2024 Six Flags Entertainmen

425 Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: June 18, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 18, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 18, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 18, 2024 Six Flags Entertainmen

Filed by CopperSteel Hold Co, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No. 333-276255 Date: June 18, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15

June 18, 2024 EX-99.2

Cedar Fair and Six Flags Announce Senior Management Team That Will Lead Combined Company Following Completion of Planned Merger of Equals

Exhibit 99.2 Cedar Fair and Six Flags Announce Senior Management Team That Will Lead Combined Company Following Completion of Planned Merger of Equals SANDUSKY, Ohio and ARLINGTON, Texas-(June 18, 2024)- Cedar Fair, L.P. (NYSE: FUN) (“Cedar Fair”) and Six Flags Entertainment Corporation (NYSE: SIX) (“Six Flags”), today announced the senior management team that will lead the combined company follow

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended March 31, 2024 or o Transition report pursuant

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended March 31, 2024 or o Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six

May 9, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 9, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 9, 2024 EX-99.1

Six Flags Reports First Quarter 2024 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports First Quarter 2024 Performance ARLINGTON, Texas — May 9, 2024 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported first quarter Revenu

May 2, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 2, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 2, 2024 EX-4.1

Indenture, dated as of May 2, 2024, among Six Flags Entertainment Corporation, Six Flags Theme Parks Inc., each of the guarantors party thereto and U.S. Bank Trust Company, National Association, as trustee and collateral agent.

Exhibit 4.1 SIX FLAGS ENTERTAINMENT CORPORATION, SIX FLAGS THEME PARKS INC. AND EACH OF THE GUARANTORS PARTY HERETO FROM TIME TO TIME 6.625% SENIOR SECURED NOTES DUE 2032 INDENTURE DATED AS OF MAY 2, 2024 U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION TRUSTEE AND NOTES COLLATERAL AGENT TABLE OF CONTENTS ARTICLE 1 DEFINITIONS AND INCORPORATION BY REFERENCE Section 1.01 Definitions 1 Section 1.02 Oth

May 2, 2024 EX-99.1

Six Flags Announces Closing of Offering of $850 Million of 6.625% Senior Secured Notes due 2032

Exhibit 99.1 Contact: Evan Bertrand Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Closing of Offering of $850 Million of 6.625% Senior Secured Notes due 2032 ARLINGTON, Texas-( May 2, 2024)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “Six Flags,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator o

April 29, 2024 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 10-K/A (Amendment No. 1) (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 10-K/A (Amendment No. 1) (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from    to     Co

April 16, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainme

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: April 16, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 16, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainme

Filed by CopperSteel Hold Co, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No. 333-276255 Date: April 16, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 1

April 16, 2024 EX-99.1

Unaudited Pro Forma Condensed Combined Financial Information

Exhibit 99.1 Unaudited Pro Forma Condensed Combined Financial Information Introduction On November 2, 2023, Six Flags Entertainment Corporation, a Delaware corporation (“Six Flags”), Cedar Fair, L.P., a Delaware limited partnership (“Cedar Fair”), CopperSteel HoldCo, Inc., a Delaware corporation (“CopperSteel”) and a subsidiary of Six Flags and Cedar Fair, and CopperSteel Merger Sub, LLC a Delawar

April 16, 2024 EX-99.1

Six Flags Announces Private Offering of $850 Million of Senior Secured Notes

Exhibit 99.1 Contact: Evan Bertrand Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Private Offering of $850 Million of Senior Secured Notes ARLINGTON, Texas - (April 16, 2024) - Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “Six Flags,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks

April 16, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 16, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 16, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 12, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 12, 2024 Six Flags Entertainme

425 Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: March 12, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 12, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 12, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 12, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 12, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 12, 2024 Six Flags Entertainme

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: March 12, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15

March 4, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 4, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Revised Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Pro

March 4, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2024 Six Flags Entertainme

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: March 4, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 4, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2024 Six Flags Entertainme

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Registration File No: 333-276255 Date: March 4, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(

February 29, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 29, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

February 29, 2024 EX-21.1

Subsidiaries of the Registrant.

Exhibit 21.1 Name of Subsidiary Jurisdiction of Incorporation/Organization 9103-2359 Quebec Inc. Canada Assenzio S.r.l. Italy CopperSteel HoldCo, Inc Delaware Entertainment Services Latam S.A. de C.V. Mexico Fiesta Texas Hospitality LLC Texas Fiesta Texas, Inc. Texas Flags Beverages, Inc. Texas Funtime, Inc. Ohio Funtime Parks, Inc. Delaware GP Holdings Inc. Delaware Great America LLC Illinois Gre

February 29, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023 o Transition Report Pursuant to Secti

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023 o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number: 1-13703 SIX FLAGS EN

February 29, 2024 EX-97.1

Compensation Clawback Recovery Policy

Exhibit 97.1 SIX FLAGS ENTERTAINMENT CORPORATION INCENTIVE COMPENSATION CLAWBACK POLICY I.POLICY AND SCOPE The Board of Directors of Six Flags Entertainment Corporation (the “Company”), acting upon the recommendation of its Compensation Committee, adopts this Incentive Compensation Clawback Policy (this “Policy”). All capitalized terms not otherwise defined shall have the meanings set forth in Sec

February 29, 2024 EX-4.8

Description of Securities.

Exhibit 4.9 SIX FLAGS ENTERTAINMENT CORPORATION DESCRIPTION OF CAPITAL STOCK Six Flags Entertainment Corporation (the “Company”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, its common stock, par value $0.25 per share. The description of the common stock of the Company that follows is a summary only and is qualified in its entirety by

February 29, 2024 EX-99.1

Six Flags Reports Fourth Quarter and Full Year 2023 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports Fourth Quarter and Full Year 2023 Performance ARLINGTON, Texas — February 29, 2024 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported

February 13, 2024 SC 13G/A

SIX / Six Flags Entertainment Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01934-sixflagsentertainmen.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Six Flags Entertainment Corp Title of Class of Securities: Common Stock CUSIP Number: 83001A102 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate b

February 12, 2024 SC 13G/A

SIX / Six Flags Entertainment Corporation / THUNDERBIRD PARTNERS LLP - SIX FLAGS ENTERTAINMENT CORP Passive Investment

SC 13G/A 1 p24-0136sc13ga.htm SIX FLAGS ENTERTAINMENT CORP SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value per share (Title of Class of Securities) 83001A102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of

January 31, 2024 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

January 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 22, 2024 Six Flags Entertain

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 22, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware 1-13703 13-3995059 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

January 23, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 22, 2024 Six Flags Entertain

425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 22, 2024 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware 1-13703 13-3995059 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.

December 22, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 20, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

December 22, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 20, 2023 Six Flags Entertai

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 20, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

December 22, 2023 EX-10.1

Letter Agreement, effective as of December 20, 2023, by and between Six Flags Entertainment Corporation and Selim A. Bassoul (incorporated by reference to Exhibit 10.1 to Six Flags Entertainment Corporation’s Current Report on Form 8-K, filed on December 22, 2023).

Exhibit 10.1 December 20, 2023 Mr. Selim Bassoul Re: Closing Bonus Dear Selim: As you are aware, on November 2, 2023, Six Flags Entertainment Corporation (the “Company”) entered into a merger agreement with Cedar Fair, L.P. and certain other parties thereto (the “Merger Agreement”). In recognition of your continued contributions to the Company and as contemplated by the Merger Agreement, the Compa

November 15, 2023 EX-99.1

Exhibit 99.1

Exhibit 99.1 VOTING AND SUPPORT AGREEMENT This VOTING AND SUPPORT AGREEMENT, dated as of November 2, 2023 (this “Agreement”), is entered into by and between Cedar Fair, L.P., a Delaware limited partnership (“Copper”) and the entities set forth on Exhibit A hereto (collectively, the “Stockholder”), and solely for purposes of Article V and Sections 4.6, 4.7, 4.8 and 6.19 herein, Six Flags Entertainm

November 15, 2023 SC 13D/A

SIX / Six Flags Entertainment Corp / H PARTNERS MANAGEMENT, LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13D-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 19)1 Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value (Title of Class of Securities) 83001A102 (CUSIP Number) H PARTNERS

November 13, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 9, 2023 Six Flags Entertain

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 13, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d

November 13, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended October 1, 2023 or o Transition report pursuant

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended October 1, 2023 or o Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six

November 13, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 9, 2023 Six Flags Entertain

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 9, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 3, 2023 425

Filed by CopperSteel HoldCo, Inc.

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 3, 2023 On November 2, 2023, the following article was published on the Wall Street Journal in relation to the proposed merger of equ

November 3, 2023 425

Filed by CopperSteel HoldCo, Inc.

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 3, 2023 TRANSCRIPT CORPORATE SPEAKERS: Michael Russell Cedar Fair LP; Corporate Director Brian Witherow Cedar Fair LP; Chief Financia

November 3, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 3, 2023 Six Flags Entertain

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 3, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)

November 3, 2023 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 3, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 2, 2023 425

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 Subject Company: CopperSteel HoldCo, Inc. Commission File No. 1-13703 Date: November 2, 2023 Investor Presentation

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 Subject Company: CopperSteel HoldCo, Inc.

November 2, 2023 EX-99.1

Six Flags Reports Third Quarter 2023 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports Third Quarter 2023 Performance ARLINGTON, Texas — November 2, 2023 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported third quarter R

November 2, 2023 EX-99.2

Disclaimer (1/2) Forward Looking Statements This presentation contains certain “forward-looking statements” within the meaning of the federal securities laws, including Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Sec

Exhibit 99.2 Investor Presentation Disclaimer (1/2) Forward Looking Statements This presentation contains certain “forward-looking statements” within the meaning of the federal securities laws, including Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements, other than statements of historic fact, included in this

November 2, 2023 EX-99.1

Cedar Fair and Six Flags to Combine in Merger of Equals, Creating a Leading Amusement Park Operator Combined Company Will Benefit from Expanded and Complementary Portfolio of 42 Iconic Parks and 9 Resort Properties Across 17 States, Canada and Mexico

Exhibit 99.1 FOR IMMEDIATE RELEASE Cedar Fair and Six Flags to Combine in Merger of Equals, Creating a Leading Amusement Park Operator Combined Company Will Benefit from Expanded and Complementary Portfolio of 42 Iconic Parks and 9 Resort Properties Across 17 States, Canada and Mexico Diversified Geographic Footprint with a More Balanced Presence in Year-Round Operating Climates More Robust Operat

November 2, 2023 425

Filed by CopperSteel HoldCo, Inc.

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 2, 2023 On November 2, 2023, Six Flags Entertainment Corporation (“Six Flags”) published the following posts on X, Facebook, Instagra

November 2, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2023 Six Flags Entert

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059

November 2, 2023 EX-2.2

Voting and Support Agreement, dated as of November 2, 2023, by and between Cedar Fair, L.P., Six Flags Entertainment Corporation, and H Partners, LP and certain of its affiliates (incorporated by reference to Exhibit 2.2 to Six Flags Entertainment Corporation’s Current Report on Form 8-K, filed on November 2, 2023).

Exhibit 2.2 VOTING AND SUPPORT AGREEMENT This VOTING AND SUPPORT AGREEMENT, dated as of November 2, 2023 (this “Agreement”), is entered into by and between Cedar Fair, L.P., a Delaware limited partnership (“Copper”) and the entities set forth on Exhibit A hereto (collectively, the “Stockholder”), and solely for purposes of Article V and Sections 4.6, 4.7, 4.8 and 6.19 herein, Six Flags Entertainme

November 2, 2023 425

Filed by CopperSteel HoldCo, Inc.

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 2, 2023 Cedar Fair and Six Flags to Combine in Merger of Equals CREATING A LEADING AMUSEMENT PARK OPERATOR Delivering an Enhanced Gue

November 2, 2023 425

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 2, 2023 Investor Presentation

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 2, 2023 Investor Presentation Disclaimer (1/2) Forward Looking Statements This presentation contains certain “forward-looking statements” within the meaning of the federal securities laws, including Section 27A of th

November 2, 2023 425

Cedar Fair and Six Flags to Combine in Merger of Equals, Creating a Leading Amusement Park Operator Combined Company Will Benefit from Expanded and Complementary Portfolio of 42 Iconic Parks and 9 Resort Properties Across 17 States, Canada and Mexico

Filed by Six Flags Entertainment Corporation pursuant to Rule 425 under the Securities Act of 1933 Subject Company: CopperSteel HoldCo, Inc.

November 2, 2023 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 2, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 2, 2023 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059

November 2, 2023 EX-2.1

Agreement and Plan of Merger, dated as of November 2, 2023, by and among Cedar Fair, L.P., and Six Flags Entertainment Corporation, CopperSteel HoldCo, Inc. and CopperSteel Merger Sub, LLC. (Incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K (Commission File No. 001-13703) filed with the SEC on November 2, 2023)

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER by and among CEDAR FAIR, L.P., SIX FLAGS ENTERTAINMENT CORPORATION, COPPERSTEEL HOLDCO, INC., and COPPERSTEEL MERGER SUB, LLC dated as of November 2, 2023 TABLE OF CONTENTS Page ARTICLE I THE MERGERS 2 SECTION 1.1 The Mergers 2 SECTION 1.2 Closing 3 SECTION 1.3 Effective Times 3 SECTION 1.4 Effects of the Transaction 4 SECTION 1.5 Organizational Documents a

November 2, 2023 425

Cedar Fair and Six Flags to Combine in Merger of Equals, Creating a Leading Amusement Park Operator Combined Company Will Benefit from Expanded and Complementary Portfolio of 42 Iconic Parks and 9 Resort Properties Across 17 States, Canada and Mexico

Filed by CopperSteel HoldCo, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Six Flags Entertainment Corporation Commission File No. 1-13703 Date: November 2, 2023 FOR IMMEDIATE RELEASE Cedar Fair and Six Flags to Combine in Merger of Equals, Creating a Leading Amusement Park Operator Combined Company Will Benefit from Expanded and Complementary Portfolio of 42 Iconic P

August 11, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended July 2, 2023 or ☐ Transition report pursuant to

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended July 2, 2023 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six Fl

August 11, 2023 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 10, 2023 Six Flags Entertai

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 10, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 11, 2023 EX-10.4

Consulting Agreement, dated August 11, 2023, by and between Six Flags Entertainment Corporation and Aimee Williams-Ramey

Exhibit 10.4 CONSULTING AGREEMENT THIS CONSULTING AGREEMENT (this “Agreement”) is made and entered into by and between Six Flags Entertainment Corporation (the “Company”) and Aimee Williams-Ramey (“Consultant”) as of August 11, 2023 (the “Effective Date”). The Company and Consultant are sometimes referred to in this Agreement collectively as the “Parties,” and each individually as a “Party.” WHERE

August 11, 2023 EX-3.1

Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Six Flags Entertainment Corporation

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF SIX FLAGS ENTERTAINMENT CORPORATION   (Pursuant to Section 242 of the Delaware General Corporation Law) SIX FLAGS ENTERTAINMENT CORPORATION, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the “Corporation”), does hereby certify as follo

August 11, 2023 EX-10.3

Separation Agreement and General Release, dated August 11, 2023, by and between Six Flags Entertainment Corporation and Aimee Williams-Ramey

Exhibit 10.3 Separation Agreement and General Release Aimee Williams-Ramey (“Executive” and referred to herein as “you”) and Six Flags Entertainment Corporation, a Delaware corporation (the “Company”), hereby knowingly and voluntarily agree to enter into this Separation Agreement and General Release (“Agreement”) which sets forth the terms agreed to in connection with the termination of your emplo

August 11, 2023 EX-99.1

Six Flags Reports Second Quarter 2023 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports Second Quarter 2023 Performance ARLINGTON, Texas — August 11, 2023 (Corrected) — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported second quar

August 10, 2023 EX-99.1

Six Flags Reports Second Quarter 2023 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports Second Quarter 2023 Performance ARLINGTON, Texas — August 10, 2023 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported second quarter Revenue

August 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 10, 2023 Six Flags Entertainm

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 10, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 12, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 10, 2023 Six Flags Entertainment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 10, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 8, 2023 EX-99.1

Six Flags Reports First Quarter 2023 Performance

Exhibit 99.1 Contact: Evan Bertrand Vice President and Treasurer +1-972-595-5180 [email protected] Six Flags Reports First Quarter 2023 Performance ARLINGTON, Texas — May 8, 2023 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of water parks in North America, today reported first quarter Revenue of $142 million, Net Loss

May 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended April 2, 2023 or ☐ Transition report pursuant t

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended April 2, 2023 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six F

May 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 8, 2023 Six Flags Entertainment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 8, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 4, 2023 EX-10.1

Replacement Revolving Facility and Incremental Amendment to Second Amended and Restated Credit Agreement, dated as of May 3, 2023, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., each of the subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent, and the replacement revolving lenders and incremental revolving lenders.

Exhibit 10.1 Execution Version Replacement revolving facility AND INCREMENTAL AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS REPLACEMENT REVOLVING FACILITY AND INCREMENTAL AMENDMENT to SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Replacement and Increase Amendment”) dated as of May 3, 2023, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Par

May 4, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 4, 2023 Six Flags Entertainment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 4, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 4, 2023 EX-99.2

Results of Cash Tender Offer for Any and All of its 4.875% Senior Notes due 2024

Exhibit 99.2 Contact: Investor Relations +1-972-595-5180 [email protected] Results of Cash Tender Offer for Any and All of its 4.875% Senior Notes due 2024 May 3, 2023 ARLINGTON, Texas-(BUSINESS WIRE)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks in North America, today

May 4, 2023 EX-4.1

Indenture, dated as of May 3, 2023, among Six Flags Entertainment Corporation, each of the guarantors party thereto and U.S. Bank Trust Company, National Association, as trustee.

Exhibit 4.1       SIX FLAGS ENTERTAINMENT CORPORATION   and each of the Guarantors PARTY HERETO   7.250% SENIOR NOTES DUE 2031       INDENTURE   Dated as of May 3, 2023       U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION   Trustee             TABLE OF CONTENTS   Article 1 DEFINITIONS AND INCORPORATION BY REFERENCE   Section 1.01 Definitions 1 Section 1.02 Other Definitions 29 Section 1.03 Incorpor

May 4, 2023 EX-10.2

Fourth Amendment to Second Amended and Restated Credit Agreement, dated as of May 3, 2023, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., each of the subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto.

Exhibit 10.2 Execution Version FOURTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS FOURTH Amendment to SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) dated as of May 3, 2023, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Holdings”), SIX FLAGS THEME PARKS INC., a Dela

May 4, 2023 EX-99.3

Six Flags Announces Closing of Amendments to Credit Facility

Exhibit 99.3 Contact: Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Closing of Amendments to Credit Facility May 3, 2023 ARLINGTON, Texas-(BUSINESS WIRE)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks in North America, today announced that conc

May 4, 2023 EX-99.1

Six Flags Announces Closing of $800 Million Notes Offering

Exhibit 99.1 Contact: Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Closing of $800 Million Notes Offering May 3, 2023 ARLINGTON, Texas-(BUSINESS WIRE)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks in North America, today announced that it has

April 26, 2023 EX-99.1

Six Flags Announces Private Offering of $800 Million of Senior Notes

Exhibit 99.1 Contact: Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Private Offering of $800 Million of Senior Notes April 26, 2023 ARLINGTON, Texas-(BUSINESS WIRE)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks in North America, today announce

April 26, 2023 EX-99.2

Six Flags Announces Tender Offer for its 4.875% Senior Notes due 2024

Exhibit 99.2 Contact: Investor Relations +1-972-595-5180 [email protected] Six Flags Announces Tender Offer for its 4.875% Senior Notes due 2024 April 26, 2023 ARLINGTON, Texas-(BUSINESS WIRE)- Six Flags Entertainment Corporation (NYSE: SIX) (the “Company,” “we,” “us” or “our”), the world’s largest regional theme park company and the largest operator of water parks in North America, today announc

April 26, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 26, 2023 Six Flags Entertainme

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 26, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 28, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defi

March 28, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 1

March 17, 2023 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 1

March 10, 2023 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 31, 2023 Six Flags Enterta

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 31, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 7, 2023 EX-21

Subsidiaries of the Registrant.

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name of Subsidiary Jurisdiction of Incorporation/Organization 9103-2359 Quebec Inc. Canada Assenzio S.r.l. Italy Entertainment Services Latam S.A. de C.V. Mexico Fiesta Texas Hospitality LLC Texas Fiesta Texas, Inc. Texas Flags Beverages, Inc. Texas Funtime Inc. Ohio Funtime Parks, Inc. Delaware GP Holdings Inc. Delaware Great America LLC Illinois Great

March 7, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended January 1, 2023 ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File Number: 1-13703 SIX FLAGS ENTE

March 7, 2023 EX-4.9

Description of Securities.

Exhibit 4.9 SIX FLAGS ENTERTAINMENT CORPORATION DESCRIPTION OF CAPITAL STOCK Six Flags Entertainment Corporation (the “Company”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, its common stock, par value $0.25 per share. The description of the common stock of the Company that follows is a summary only and is qualified in its entirety by

March 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 2, 2023 Six Flags Entertainmen

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 2, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 2, 2023 EX-99.1

Six Flags Reports Fourth Quarter and Full Year 2022 Performance

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Reports Fourth Quarter and Full Year 2022 Performance ARLINGTON, Texas — March 2, 2023 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North Am

March 2, 2023 NT 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING (Check One): ☒ Form 10-K ☐ Form 20-F ☐ Form 11-K ☐ Form 10-Q ☐ Form 10-D ☐ Form N-CEN ☐ Form N-CSR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING (Check One): ☒ Form 10-K ☐ Form 20-F ☐ Form 11-K ☐ Form 10-Q ☐ Form 10-D ☐ Form N-CEN ☐ Form N-CSR For Period Ended: January 1, 2023 ☐ Transition Report on Form 10-K ☐ Transition Report on Form 20-F ☐ Transition Report on Form 11-K ☐ Transition Report on Form 10-Q For the Transition Period Ended: Read Instruction (on back page) Before Preparing Form.

February 13, 2023 SC 13G/A

SIX / Six Flags Entertainment Corp / THUNDERBIRD PARTNERS LLP Passive Investment

SC 13G/A 1 p23-0019sc13ga.htm SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value per share (Title of Class of Securities) 83001A102 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the ap

February 9, 2023 SC 13G/A

SIX / Six Flags Entertainment Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01904-sixflagsentertainmen.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Six Flags Entertainment Corp. Title of Class of Securities: Common Stock CUSIP Number: 83001A102 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate

January 31, 2023 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 31, 2023 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

January 31, 2023 EX-99.1

Six Flags Appoints New Independent Director to its Board of Directors

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Appoints New Independent Director to its Board of Directors ARLINGTON, Texas — January 31, 2023 —Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in

November 21, 2022 SC 13G

SIX / Six Flags Entertainment Corp / THUNDERBIRD PARTNERS LLP - SIX FLAGS ENTERTAINMENT CORPORATION Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value per share (Title of Class of Securities) 83001A102 (CUSIP Number) November 10, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the ru

November 14, 2022 EX-99.1

AMENDMENT NO. 1 TO THE COOPERATION AGREEMENT

Exhibit 99.1 AMENDMENT NO. 1 TO THE COOPERATION AGREEMENT This Amendment No. 1 to the Cooperation Agreement (?Amendment No. 1?) is entered into as of November 10, 2022, by and among Six Flags Entertainment Corporation (the ?Company?) and the persons and entities set forth on Schedule A to the Agreement (as defined below) (the ?H Partners Group,? and, for clarity and as applicable, including each m

November 14, 2022 SC 13D/A

SIX / Six Flags Entertainment Corp / H PARTNERS MANAGEMENT, LLC - AMENDMENT NO. 18 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 18)1 Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value (Title of Class of Securities) 83001A102 (CUSIP Number) H Partners

November 10, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended October 2, 2022 or ☐ Transition report pursuant

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended October 2, 2022 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six

November 10, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 10, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 10, 2022 EX-10.1

Amendment No. 1, dated November 10, 2022, to the Cooperation Agreement, dated as of January 30, 2020, by and among Six Flags Entertainment Corporation and H Partners Management, LLC and certain of its affiliates – incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on November 10, 2022

AMENDMENT NO. 1 TO THE COOPERATION AGREEMENT ? This Amendment No. 1 to the Cooperation Agreement (?Amendment No. 1?) is entered into as of November 10, 2022, by and among Six Flags Entertainment Corporation (the ?Company?) and the persons and entities set forth on Schedule A to the Agreement (as defined below) (the ?H Partners Group,? and, for clarity and as applicable, including each member there

November 10, 2022 EX-99.1

Six Flags Announces Third Quarter 2022 Performance

Exhibit 99.1 ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Announces Third Quarter 2022 Performance ? ARLINGTON, Texas ? November 10, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of waterparks in North A

November 10, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 10, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 10, 2022 EX-99.1

Six Flags Amends Cooperation Agreement with H Partners

Exhibit 99.1 ? ? ? ? ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Amends Cooperation Agreement with H Partners ? ? ARLINGTON, Texas ? November 10, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of water

October 5, 2022 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 19, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

September 22, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 19, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

September 14, 2022 CORRESP

United States Securities and Exchange Commission

September 12, 2022 United States Securities and Exchange Commission Division of Corporation Finance Office of Trade & Services 100 F Street, N.

August 17, 2022 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 22, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 15, 2022 SC 13D/A

SIX / Six Flags Entertainment Corp / H PARTNERS MANAGEMENT, LLC - AMENDMENT NO. 17 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 17)1 Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value (Title of Class of Securities) 83001A102 (CUSIP Number) H PARTNERS

August 11, 2022 EX-99

Six Flags Announces Second Quarter 2022 Performance

Exhibit 99.1 ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Announces Second Quarter 2022 Performance ? ARLINGTON, Texas ? August 11, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of waterparks in North

August 11, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended July 3, 2022 or ☐ Transition report pursuant to

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION ? Washington, D.

August 11, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 11, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

July 28, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 22, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

July 28, 2022 EX-99.1

Six Flags Announces Board of Directors Changes

Exhibit 99.1 ? ? ? ? ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? ? Six Flags Announces Board of Directors Changes ? ARLINGTON, Texas ? July 28, 2022 ?Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of waterparks in Nort

June 23, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 20, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 14, 2022 EX-99

Six Flags Promotes Diversity & Inclusion Through Key Leadership Appointments

Exhibit 99.1 ? ? ? ? ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Promotes Diversity & Inclusion Through Key Leadership Appointments ? ? ARLINGTON, Texas ? June 13, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest

June 14, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 13, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

June 14, 2022 EX-10

Employment Agreement, dated June 13, 2022, by and between Aimee Williams-Ramey and Six Flags Entertainment Corporation – incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on June 14, 2022

EMPLOYMENT AGREEMENT This Employment Agreement (the ?Agreement?), dated as of June 13, 2022, is entered into by and between Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?) and Aimee Williams-Ramey (the ?Executive?).

June 9, 2022 SC 13G/A

SIX / Six Flags Entertainment Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Six Flags Entertainment Corp. Title of Class of Securities: Common Stock CUSIP Number: 83001A102 Date of Event Which Requires Filing of this Statement: May 31, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

May 31, 2022 EX-10

Employment Agreement, dated May 31, 2022, by and between Gary Mick and Six Flags Entertainment Corporation – incorporated by reference to exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on May 31, 2022

Exhibit 10.1 ? EMPLOYMENT AGREEMENT This Employment Agreement (the ?Agreement?), dated as of May 31, 2022, is entered into by and between Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?) and Gary Mick (the ?Executive?). W I T N E S S E T H: WHEREAS, the Company desires to employ the Executive on the terms and conditions set forth herein; and WHEREAS, the Executive desire

May 31, 2022 EX-99

Six Flags Appoints Gary Mick Chief Financial Officer

Exhibit 99.1 ? ? ? ? ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Appoints Gary Mick Chief Financial Officer ? ? ARLINGTON, Texas ? May 31, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of waterparks i

May 31, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 31, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 12, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 12, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 12, 2022 EX-10.1

Form of Performance Stock Unit Agreement Pursuant to the Six Flags Entertainment Corporation Long-Term Incentive Plan – incorporate by reference to Exhibit 10.1 to Registrant’s Quarterly Report on Form 10-Q (File No. 001-13703) for the quarterly period ended April 3, 2022

Exhibit 10.1 PERFORMANCE STOCK UNIT AGREEMENT PURSUANT TO THE SIX FLAGS ENTERTAINMENT CORPORATION LONG-TERM INCENTIVE PLAN * * * * * Participant: [?] Grant Date: [?] Number of Target Performance Stock Units (?Target PSUs?): [?] * * * * * THIS PERFORMANCE STOCK UNIT AWARD AGREEMENT (this ?Agreement?), dated as of the Grant Date specified above, is entered into by and between Six Flags Entertainment

May 12, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended April 3, 2022 or ☐ Transition report pursuant t

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION ? Washington, D.

May 12, 2022 EX-99.1

Six Flags Announces First Quarter 2022 Performance

Exhibit 99.1 ? ? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] ? ? Six Flags Announces First Quarter 2022 Performance ? ARLINGTON, Texas ? May 12, 2022 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of waterparks in North Amer

May 11, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 11, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 29, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? ? ? Preliminary Proxy Statement ? ? ? Confidential, for Use of the Commission Only (as permitted b

March 29, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? ? ? Preliminary Proxy Statement ? ? ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)

March 18, 2022 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? ? ? Preliminary Proxy Statement ? ? ? Confidential, for Use of the Commission Only (as permitted b

February 28, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 25, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

February 28, 2022 EX-99.1

Six Flags Announces CFO Transition

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Announces CFO Transition ARLINGTON, Texas — February 28, 2022 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North America, today announced th

February 24, 2022 EX-4.9

Description of Securities.

Exhibit 4.9 SIX FLAGS ENTERTAINMENT CORPORATION DESCRIPTION OF CAPITAL STOCK Six Flags Entertainment Corporation (the ?Company?) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, its common stock, par value $0.25 per share. The description of the common stock of the Company that follows is a summary only and is qualified in its entirety by

February 24, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 24, 2022 EX-99.1

Six Flags Announces Fourth Quarter and Full Year 2021 Performance

? ? Contact: Stephen Purtell Senior Vice President Corporate Communications, Investor Relations and Treasurer +1-972-595-5180 investors@sftp.

February 24, 2022 EX-21

Subsidiaries of the Registrant.

Exhibit 21.1 ? SUBSIDIARIES OF THE REGISTRANT ? Name of Subsidiary ? Jurisdiction of Incorporation/Organization 9103-2359 Quebec Inc. ? Canada Assenzio S.r.l. ? Italy Entertainment Services Latam S.A. de C.V. ? Mexico Fiesta Texas Hospitality LLC ? Texas Fiesta Texas, Inc. ? Texas Flags Beverages, Inc. ? Texas Funtime Inc. ? Ohio Funtime Parks, Inc. ? Delaware GP Holdings Inc. ? Delaware Great Ame

February 24, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 24, 2022 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

February 10, 2022 SC 13G/A

SIX / Six Flags Entertainment Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Six Flags Entertainment Corp. Title of Class of Securities: Common Stock CUSIP Number: 83001A102 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule i

December 15, 2021 SC 13D/A

SIX / Six Flags Entertainment Corp / H PARTNERS MANAGEMENT, LLC - AMENDMENT NO. 16 TO THE SCHEDULE 13D Activist Investment

SC 13D/A 1 sc13da161030400412152021.htm AMENDMENT NO. 16 TO THE SCHEDULE 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 16)1 Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025

December 3, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 1, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

December 3, 2021 EX-10.1

Agreement and General Release, dated December 3, 2021, by and between Laura W. Doerre and Six Flags Entertainment Corporation

Exhibit 10.1 Agreement and General Release ? Agreement and General Release (?Agreement?), by and between Laura W. Doerre (?Executive? and referred to herein as ?you?) and Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?). 1.(a)Your employment with the Company as Executive Vice President, General Counsel and Chief Administrative Officer will terminate effective as of Decem

November 15, 2021 EX-99.1

Six Flags Announces New CEO Selim Bassoul Appointed CEO and President Ben Baldanza Named Non-Executive Chairman

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Investor Relations, Treasury and Strategy +1-972-595-5180 [email protected] Six Flags Announces New CEO Selim Bassoul Appointed CEO and President Ben Baldanza Named Non-Executive Chairman ARLINGTON, Texas ? November 15, 2021 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest

November 15, 2021 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 13, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

November 15, 2021 EX-10.1

Agreement and General Release, dated November 13, 2021 by and between Six Flags Entertainment Corporation and Michael Spanos

Exhibit 10.1 Agreement and General Release Agreement and General Release (?Agreement?), by and between Michael Spanos (?Executive? and referred to herein as ?you?) and Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?). 1. (a) Your employment with the Company as Chief Executive Officer terminated effective as of November 14, 2021 (the ?Separation Date?), and you are deemed

November 15, 2021 EX-10.2

Employment Agreement, dated November 14, 2021, by and between Six Flags Entertainment Corporation and Selim A. Bassoul—incorporated by reference to Exhibit 10.2 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on November 15, 2021.

Exhibit 10.2 EMPLOYMENT AGREEMENT This Employment Agreement (the ?Agreement?), dated as of November 14, 2021, is entered into by and between Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?) and Selim A. Bassoul (the ?Executive?). W I T N E S S E T H: WHEREAS, Executive presently serves as Chairman of the Board of Directors of the Company (the ?Board?); and WHEREAS, the C

October 27, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 27, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

October 27, 2021 EX-99.1

Six Flags Announces Third Quarter 2021 Performance

? ? Contact: Stephen Purtell Senior Vice President Investor Relations, Treasury and Strategy +1-972-595-5180 investors@sftp.

October 27, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended October 3, 2021 or ☐ Transition report pursuant

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION ? Washington, D.

August 23, 2021 SC 13D/A

SIX / Six Flags Entertainment Corp / H PARTNERS MANAGEMENT, LLC - AMENDMENT NO. 15 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 15)1 Six Flags Entertainment Corporation (Name of Issuer) Common Stock, $0.025 par value (Title of Class of Securities) 83001A102 (CUSIP Number) H Partners

July 28, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended July 4, 2021 or ☐ Transition report pursuant to

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION ? Washington, D.

July 28, 2021 EX-99

Six Flags Announces Second Quarter 2021 Performance

EX-99 2 six-20210728xex99.htm PRESS RELEASE Contact: Stephen Purtell Senior Vice President Investor Relations, Treasury and Strategy +1-972-595-5180 [email protected] Six Flags Announces Second Quarter 2021 Performance ARLINGTON, Texas — July 28, 2021 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North

July 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 28, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 6, 2021 EX-3

Restated Certificate of Incorporation of Six Flags Entertainment Corporation, as amended—incorporated by reference to Exhibit 3.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on May 6, 2021.

Exhibit 3.1 ? AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF SIX FLAGS ENTERTAINMENT CORPORATION (Pursuant to Sections 242 and 245 of the General Corporation Law of the State of Delaware) Six Flags Entertainment Corporations, a corporation organized and existing under and by virtue of the provisions of the General Corporation Law of the State of Delaware (the ?DGCL?), does hereby certify as

May 6, 2021 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 6, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 28, 2021 10-Q

Quarterly Report - 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION ? Washington, D.

April 28, 2021 EX-10.1

Form of Restricted Stock Unit Agreement Pursuant to the Six Flags Entertainment Corporation Long-Term Incentive Plan—incorporated by reference to Exhibit 10.1 to Registrant’s Form 10-Q (File No. 001-13703) for the quarter ended April 4, 2021.

Exhibit 10.1 ? RESTRICTED STOCK UNIT AGREEMENT PURSUANT TO THE SIX FLAGS ENTERTAINMENT CORPORATION LONG-TERM INCENTIVE PLAN ? * * * * * Participant: Grant Date: Number of Restricted Stock Units Granted: * * * * * THIS RESTRICTED STOCK UNIT AWARD AGREEMENT (this ?Agreement?), dated as of the Grant Date specified above, is entered into by and between Six Flags Entertainment Corporation, a corporatio

April 28, 2021 EX-10.2

Form of Performance Restricted Stock Unit Agreement Pursuant to the Six Flags Entertainment Corporation Long-Term Incentive Plan

EX-10.2 3 six-20210404xex10d2.htm EX-10.2 Exhibit 10.2 PERFORMANCE STOCK UNIT AGREEMENT PURSUANT TO THE SIX FLAGS ENTERTAINMENT CORPORATION LONG-TERM INCENTIVE PLAN * * * * * Participant: Grant Date: Number of Target Performance Stock Units (“Target PSUs”): * * * * * THIS PERFORMANCE STOCK UNIT AWARD AGREEMENT (this “Agreement”), dated as of the Grant Date specified above, is entered into by and b

April 28, 2021 EX-99

Six Flags Announces First Quarter 2021 Performance Cash Outflow for First Quarter 2021 Better than Expectations

? ? Contact: Stephen Purtell Senior Vice President Investor Relations, Treasury and Strategy +1-972-595-5180 investors@sftp.

April 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 28, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 21, 2021 DEFA14A

- DEFA14A

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy S

April 1, 2021 8-A12B/A

- 8-A12B/A

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-A/A (Amendment No. 1) FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 SIX FLAGS ENTERTAINMENT CORPORATION (Exact name of registrant as specified in its charter) ? ? Delaware ? 13-3995059 (State of incorporation or organization) ? (I.R.S. Emp

April 1, 2021 EX-3.1

Certificate of Elimination of Series B Junior Preferred Stock of Six Flags Entertainment Corporation, as filed with the Secretary of State of the State of Delaware on April 1, 2021—incorporated by reference to Exhibit 3.1 to Registrant’s Registration Statement on Form 8-A/A (File No. 001-13703) filed on April 1, 2021

? Exhibit 3.1 ? SIX FAGS ENTERTAINMENT CORPORATION CERTIFICATE OF ELIMINATION OF THE SERIES B JUNIOR PREFERRED STOCK Pursuant to Section 151(g) of the General Corporation Law of the State of Delaware ? Six Flags Entertainment Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (the ?Company?), does hereby certify as follows: 1. Pursuant to t

March 30, 2021 DEFA14A

- DEFA14A

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy S

March 29, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 29, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 23, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

March 23, 2021 DEF 14A

- DEF 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? ? ? Preliminary Proxy Statement ? ? ? Confidential, for Use of the Commission Only (as permitted b

March 12, 2021 EX-99

Six Flags Nominates Denise M. Clark as Independent Director to Join Board

Exhibit 99.1 ? ? ? Contact: Stephen R. Purtell Senior Vice President Investor Relations, Treasury & Strategy +1-972-595-5180 [email protected] ? ? ? ? ? ? ? ? Six Flags Nominates Denise M. Clark as Independent Director to Join Board ? ARLINGTON, Texas ? March 12, 2021 ? Six Flags Entertainment Corporation (NYSE: SIX), the world?s largest regional theme park company and the largest operator of wat

March 12, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 12, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 12, 2021 PRE 14A

- PRE 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? ? ? Preliminary Proxy Statement ? ? ? Confidential, for Use of the Commission Only (as permitted b

February 25, 2021 EX-10.18

Six Flags Entertainment Corporation Amended and Restated Supplemental 401(k) Plan—incorporated by reference to Exhibit 10.18 to Registrant’s Annual Report on Form 10-K (File No. 001-13703) for the year ended December 31, 2020.

Exhibit 10.18 Six Flags Entertainment Corporation Supplemental 401(k) Plan (Amended and Restated Effective as of January 1, 2021) ? ? 1.Purpose and Status The purpose of the Six Flags Entertainment Corporation Supplemental 401(k) Plan (the ?Plan?) is to attract and retain certain select management or highly compensated employees of the Company by providing a means for such employees to defer Compe

February 25, 2021 10-K

Annual Report - 10-K

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 25, 2021 EX-4.11

Description of Securities.

Exhibit 4.11 SIX FLAGS ENTERTAINMENT CORPORATION DESCRIPTION OF CAPITAL STOCK Six Flags Entertainment Corporation (the ?Company?) has two classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: (i) common stock, par value $0.25 per share, and (ii) preferred stock purchase rights. The description of the common stock and preferred stock purchase rights o

February 25, 2021 EX-10.9

Form of Indemnity Agreement—incorporated by reference to Exhibit 10.9 to Registrant’s Annual Report on Form 10-K (File No. 001-13703) for the year ended December 31, 2020.

? Exhibit 10.9 ? 1INDEMNITY AGREEMENT This Indemnity Agreement (?Agreement?) is effective as of by and between Six Flags Entertainment Corporation, a Delaware corporation (the ?Company?), and (?Indemnitee?). 1RECITALS WHEREAS, 1highly competent persons have become more reluctant to serve publicly-held corporations as directors or in other capacities unless they are provided with adequate protectio

February 25, 2021 EX-10.16

Director Deferral Election—incorporated by reference to Exhibit 10.16 to Registrant’s Annual Report on Form 10-K (File No. 001-13703) for the year ended December 31, 2020.

Exhibit 10.16 Director dEFERRAL ELECTION ? DEFERRAL: Pursuant to the Six Flags Entertainment Corporation Long-Term Incentive Plan (?Plan?) and the decision to make Deferred Share Units pursuant to Section 8 of the Plan available to directors of the Company, I hereby elect to receive stock units (?Director Deferred Share Units?) in lieu of the cash retainer for my service as a director in [YEAR] an

February 25, 2021 EX-10.10

Form of Restricted Stock Unit Agreement Pursuant to the Six Flags Entertainment Corporation Long-Term Incentive Plan

Exhibit 10.10 ? RESTRICTED STOCK UNIT AGREEMENT PURSUANT TO THE SIX FLAGS ENTERTAINMENT CORPORATION LONG-TERM INCENTIVE PLAN ? * * * * * Participant: Grant Date: Number of Restricted Stock Units Granted: * * * * * THIS RESTRICTED STOCK UNIT AWARD AGREEMENT (this ?Agreement?), dated as of the Grant Date specified above, is entered into by and between Six Flags Entertainment Corporation, a corporati

February 25, 2021 EX-21

Subsidiaries of the Registrant.

Exhibit 21.1 ? SUBSIDIARIES OF THE REGISTRANT ? Name of Subsidiary ? Jurisdiction of Incorporation/Organization 9103-2359 Quebec Inc. ? Canada Assenzio S.r.l. ? Italy Entertainment Services Latam S.A. de C.V. ? Mexico Fiesta Texas Hospitality LLC ? Texas Fiesta Texas, Inc. ? Texas Flags Beverages, Inc. ? Texas Funtime Inc. ? Ohio Funtime Parks, Inc. ? Delaware GP Holdings Inc. ? Delaware Great Ame

February 24, 2021 EX-99

Six Flags Announces Fourth Quarter and Full Year 2020 Performance Cash Outflow for Fourth Quarter 2020 Better than Expectations Company Provides Update on Transformation Plan

? ? Contact: Stephen Purtell Senior Vice President Investor Relations, Treasury and Strategy +1-972-595-5180 investors@sftp.

February 24, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 24, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

February 16, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2 )* Six Flags Entertainment Corp. (Name of Issuer) Common Stock (Title of Class of Securities) 83001A102 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 12, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 9, 2021 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) ? ? ? ? 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Six Flags Entertainment Corp. Title of Class of Securities: Common Stock CUSIP Number: 83001A102 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule i

December 28, 2020 EX-10.1

Consent to Second Amended and Restated Credit Agreement, dated as of December 28, 2020, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., the other subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent and the other lenders party thereto

Exhibit 10.1 CONSENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS CONSENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Consent”) dated as of December 28, 2020, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Holdings”), SIX FLAGS THEME PARKS INC., a Delaware corporation (the “Borrower”

December 28, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 28, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

October 28, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 28, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

October 28, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended September 30, 2020 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703

October 28, 2020 EX-99

Six Flags Announces Third Quarter 2020 Earnings Cash Outflow In-Line with Expectations Transformation Plan Underway

Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 investors@sftp.

October 13, 2020 8-K

Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 13, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

September 11, 2020 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers - 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 4, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 27, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 23, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 27, 2020 EX-10.1

Amended and Restated Employment Agreement, dated as of July 23, 2020, by and between Laura Doerre and Six Flags Entertainment Corporation—incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on August 27, 2020.

Exhibit 10.1 AMENDED & RESTATED EMPLOYMENT AGREEMENT This Amended & Restated Employment Agreement (the “Agreement”), dated as of July 23, 2020 is entered into by and between Six Flags Entertainment Corporation, a Delaware corporation (the “Company”) and Laura Doerre (the “Executive”). W I T N E S S E T H: WHEREAS, the Company and Executive desire that Executive serve as Executive Vice President, G

August 27, 2020 8-K/A

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 26, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 27, 2020 EX-99.1

Credit Facility Amendment Provides Additional Financial Flexibility to Six Flags

Exhibit 99.1 Contact: Stephen R. Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] August 26, 2020 ARLINGTON, Texas — Please replace the release (dated August 26, 2020) with the following corrected version due to multiple revisions. The updated release reads: Credit Facility Amendment Provides Additional Financial Flexibility to Six Flags Six Flags E

August 26, 2020 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 26, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 26, 2020 EX-99.1

Credit Facility Amendment Provides Additional Financial Flexibility to Six Flags

Exhibit 99.1 Contact: Stephen R. Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Credit Facility Amendment Provides Additional Financial Flexibility to Six Flags ARLINGTON, Texas — August 26, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North Americ

August 26, 2020 EX-10.1

Third Amendment to Second Amended and Restated Credit Agreement, dated as of August 26, 2020, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., the other subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent and the other lenders party thereto─incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on August 26, 2020

Exhibit 10.1 Execution Version THIRD AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS THIRD AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) dated as of August 26, 2020, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Holdings”), SIX FLAGS THEME PARKS INC., a De

August 5, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) August 4, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

August 5, 2020 EX-99

Two Directors Added to Six Flags Board of Directors Two Directors Announce Intention to Retire

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Two Directors Added to Six Flags Board of Directors Two Directors Announce Intention to Retire ARLINGTON, Texas — August 5, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in No

July 30, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended June 30, 2020 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six F

July 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 29, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

July 29, 2020 EX-99

Six Flags Announces Second Quarter Earnings Improves Cash Flow Outlook from Company’s Prior Guidance Company Developing Business Transformation Initiative for Long-Term Earnings Growth

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Announces Second Quarter Earnings Improves Cash Flow Outlook from Company’s Prior Guidance Company Developing Business Transformation Initiative for Long-Term Earnings Growth ARLINGTON, Texas —July 29, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the

June 24, 2020 EX-10.1

Employment Agreement, dated as of June 21, 2020, by and between Sandeep Reddy and Six Flags Entertainment Corporation—incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on June 24, 2020.

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (the “Agreement”), dated as of June 21, 2020 is entered into by and between Six Flags Entertainment Corporation, a Delaware corporation (the “Company”) and Sandeep Reddy (the “Executive”). W I T N E S S E T H: WHEREAS, the Company and Executive desire that Executive serve as Chief Financial Officer and Executive Vice President of the Comp

June 24, 2020 EX-99.1

Six Flags Appoints Sandeep Reddy Chief Financial Officer

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Appoints Sandeep Reddy Chief Financial Officer Arlington, Texas — June 24, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North America, today announced that it ha

June 24, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 21, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

May 8, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 6, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 30, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 30, 2020 EX-3.1

Restated Certificate of Incorporation, as amended—incorporated by reference to Exhibit 3.1 to Registrant's Quarterly Report on Form 10-Q (File No. 001-13703) filed on April 30, 2020

Exhibit 3.1 CERTIFICATE OF DESIGNATIONS of SERIES B JUNIOR PREFERRED STOCK of SIX FLAGS ENTERTAINMENT CORPORATION (Pursuant to Section 151 of the Delaware General Corporation Law) Six Flags Entertainment Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), hereby certifies that the following resolution was adopted by the

April 30, 2020 EX-10.1

Form of Amendment to Employment Agreement for Executive Officers—incorporated by reference to Exhibit 10.1 to Registrant’s Quarterly Report on Form 10-Q (File No. 001-13703) filed on April 30, 2020.

Exhibit 10.1 Form of Amendment to Employment Agreement for Executive Officers To: NAME From: NAME Re: Salary Reduction Date: DATE As you know, the company is implementing significant cost-saving measures, including temporary salary reductions, to offset the decline in revenue due to the COVID-19 epidemic. Thank you for your agreement to participate in these salary reductions, notwithstanding the c

April 30, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended March 31, 2020 or ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to Commission file number: 1-13703 Six

April 30, 2020 EX-99.1

Six Flags Announces First Quarter Earnings Updates COVID-19 Response Actions and Liquidity Position

Exhibit 99.1 Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Announces First Quarter Earnings Updates COVID-19 Response Actions and Liquidity Position GRAND PRAIRIE, Texas — April 30, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterpa

April 23, 2020 EX-10.1

Second Amendment to Second Amended and Restated Credit Agreement, dated as of April 22, 2020, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., the other subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent, and the revolving credit lenders party thereto─incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on April 23, 2020

Exhibit 10.1 Execution Version SECOND AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS SECOND Amendment to SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) dated as of April 22, 2020, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Holdings”), SIX FLAGS THEME PARKS INC., a D

April 23, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 22, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 23, 2020 EX-4.1

Indenture, dated as of April 15, 2020, by and among Six Flags Theme Parks Inc., the Guarantors party thereto and U.S. Bank National Association as trustee and as collateral agent.

Exhibit 4.1 Execution SIX FLAGS THEME PARKS INC. and each of the Guarantors PARTY HERETO 7.000% SENIOR SECURED NOTES DUE 2025 INDENTURE Dated as of April 22, 2020 U.S. BANK NATIONAL ASSOCIATION Trustee and Collateral Agent TABLE OF CONTENTS Article 1 DEFINITIONS AND INCORPORATION BY REFERENCE Section 1.01 Definitions. 1 Section 1.02 Other Definitions. 39 Section 1.03 Incorporation by Reference of

April 23, 2020 EX-99.1

Closing of $725 Million Senior Secured Notes Offering and Amendment to Credit Facility by Six Flags

Exhibit 99.1 Contact: Stephen R. Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Closing of $725 Million Senior Secured Notes Offering and Amendment to Credit Facility by Six Flags GRAND PRAIRIE, Texas — April 22, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of wate

April 15, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 14, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 15, 2020 EX-99.1

Private Offering of $665 Million of Senior Secured Notes by Six Flags Company Receives Sufficient Consents for Credit Facility Amendment

Exhibit 99.1 mailto:[email protected] Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Private Offering of $665 Million of Senior Secured Notes by Six Flags Company Receives Sufficient Consents for Credit Facility Amendment GRAND PRAIRIE, Texas — April 15, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest r

April 13, 2020 DEFA14A

SIX / Six Flags Entertainment Corp DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant  Check the appropriate box:  Preliminary Proxy Statement  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))  Defin

April 8, 2020 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 8, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

April 8, 2020 EX-10.2

Replacement Revolving Facility Amendment to Second Amended and Restated Credit Agreement, dated as of April 8, 2020, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., the other subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent, and the revolving credit lenders party thereto─incorporated by reference to Exhibit 10.2 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on April 8, 2020

Exhibit 10.2 REPLACEMENT REVOLVING FACILITY AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS REPLACEMENT REVOLVING FACILITY AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Replacement Amendment”) dated as of April 8, 2020, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Ho

April 8, 2020 EX-10.1

First Incremental Amendment to Second Amended and Restated Credit Agreement, dated as of April 8, 2020, among Six Flags Entertainment Corporation, Six Flags Operations Inc., Six Flags Theme Parks Inc., the other subsidiary guarantors party thereto, Wells Fargo Bank, National Association, as administrative agent, and the revolving credit lenders party thereto─incorporated by reference to Exhibit 10.1 to Registrant’s Current Report on Form 8-K (File No. 001-13703) filed on April 8, 2020

Exhibit 10.1 FIRST INCREMENTAL AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT THIS FIRST INCREMENTAL AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Incremental Amendment”) dated as of April 8, 2020, is by and among SIX FLAGS ENTERTAINMENT CORPORATION, a Delaware corporation (the “Parent”), SIX FLAGS OPERATIONS INC., a Delaware corporation (“Holdings”), SIX FLAGS THEME

April 8, 2020 EX-99.1

Six Flags Increases Revolving Credit Facility to $481 Million to Provide Additional Liquidity and Financial Flexibility Company Provides Business Update; Withdraws Full Year 2020 Financial Guidance; Suspends Quarterly Dividend and Postpones May 28 In

Exhibit 99.1 mailto:[email protected] Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Six Flags Increases Revolving Credit Facility to $481 Million to Provide Additional Liquidity and Financial Flexibility Company Provides Business Update; Withdraws Full Year 2020 Financial Guidance; Suspends Quarterly Dividend and Postpones May 28

March 31, 2020 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 31, 2020 Six Flags Entertainment Corporation (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 1-13703 13-3995059 (Commission File Number) (IRS Employer Identification No.

March 31, 2020 EX-99

Short-Term Stockholder Rights Plan Adopted by Six Flags

Exhibit 99.1 mailto:[email protected] Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Short-Term Stockholder Rights Plan Adopted by Six Flags GRAND PRAIRIE, Texas — March 31, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North Americ

March 31, 2020 EX-4

Rights Agreement, dated as of March 31, 2020, between Six Flags Entertainment Corporation and Computershare Trust Company, N.A., as rights agent

EX-4 3 six-20200331xex4.htm RIGHTS AGREEMENT Exhibit 4.1 RIGHTS AGREEMENT Dated as of March 31, 2020 between SIX FLAGS ENTERTAINMENT CORPORATION and COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent TABLE OF CONTENTS Page Section 1. Definitions 1 Section 2. Appointment of Rights Agent 7 Section 3. Issue of Right Certificates 7 Section 4. Form of Right Certificates 9 Section 5. Countersignature and

March 31, 2020 EX-99.1

Short-Term Stockholder Rights Plan Adopted by Six Flags

Exhibit 99.1 mailto:[email protected] Contact: Stephen Purtell Senior Vice President Investor Relations and Treasurer +1-972-595-5180 [email protected] Short-Term Stockholder Rights Plan Adopted by Six Flags GRAND PRAIRIE, Texas — March 31, 2020 — Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company and the largest operator of waterparks in North Americ

March 31, 2020 EX-3

Certificate of Designations of Series B Junior Preferred Stock of Six Flags Entertainment Corporation, as filed with the Secretary of State of the State of Delaware on March 31, 2020

EX-3 2 six-20200331xex3.htm CERTIFICATE OF DESIGNATIONS Exhibit 3.1 CERTIFICATE OF DESIGNATIONS of SERIES B JUNIOR PREFERRED STOCK of SIX FLAGS ENTERTAINMENT CORPORATION (Pursuant to Section 151 of the Delaware General Corporation Law) Six Flags Entertainment Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), hereby cer

March 31, 2020 EX-3.1

CERTIFICATE OF DESIGNATIONS SERIES B JUNIOR PREFERRED STOCK SIX FLAGS ENTERTAINMENT CORPORATION (Pursuant to Section 151 of the Delaware General Corporation Law)

Exhibit 3.1 CERTIFICATE OF DESIGNATIONS of SERIES B JUNIOR PREFERRED STOCK of SIX FLAGS ENTERTAINMENT CORPORATION (Pursuant to Section 151 of the Delaware General Corporation Law) Six Flags Entertainment Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), hereby certifies that the following resolution was adopted by the

March 31, 2020 EX-4.1

Rights Agreement, dated March 31, 2020, by and between Six Flags Entertainment Corporation and Computershare Trust Company, N.A.—incorporated by reference to Exhibit 4.1 to Registrant's Current Report on Form 8-K (File No. 001-13703) filed on March 31, 2020

Exhibit 4.1 RIGHTS AGREEMENT Dated as of March 31, 2020 between SIX FLAGS ENTERTAINMENT CORPORATION and COMPUTERSHARE TRUST COMPANY, N.A. as Rights Agent TABLE OF CONTENTS Page Section 1. Definitions 1 Section 2. Appointment of Rights Agent 7 Section 3. Issue of Right Certificates 7 Section 4. Form of Right Certificates 9 Section 5. Countersignature and Registration 9 Section 6. Transfer, Split-up

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