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 4, 2021 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 Flags Entertainment Corporation (Exact Name of Registrant as Specified in Its Charter) Title of each class Tradin ...

Impact of COVID-19 - The company reported a significant impact from the COVID-19 pandemic, affecting attendance and operations across its parks[12] - The company faces risks related to attendance fluctuations due to local conditions and potential health crises[13] Strategic Plans and Profitability - The company anticipates improvements in operating results and profitability through a new strategic plan, including cost reductions and organizational changes[12] - The company is focused on increasing profitability through a transformation plan, aiming for an incremental annual run-rate Adjusted EBITDA[12] Capital Enhancements and Initiatives - The company expects to roll out capital enhancements and planned initiatives in a timely and cost-effective manner, with anticipated benefits and results[12] - The company is addressing potential construction delays in capital improvements and competition from other entertainment alternatives[18] Risk Management - The company highlighted the importance of having parks in various geographical locations to mitigate risks from adverse weather and other events[12] - The company is actively monitoring compliance with laws and regulations, which may impact operational costs and business strategies[12] Employee Programs - The company is committed to enhancing employee recruitment and retention programs to support operational needs[12] Financial Evaluation - The company is evaluating its liquidity needs and cash flow adequacy in light of potential prolonged park closures[12]