0002100121-26-000719.txt : 20260429 0002100121-26-000719.hdr.sgml : 20260429 20260429152038 ACCESSION NUMBER: 0002100121-26-000719 CONFORMED SUBMISSION TYPE: SCHEDULE 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20260429 DATE AS OF CHANGE: 20260429 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: Six Flags Entertainment Corporation/NEW CENTRAL INDEX KEY: 0001999001 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-AMUSEMENT & RECREATION SERVICES [7900] ORGANIZATION NAME: 07 Trade & Services EIN: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SCHEDULE 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-94553 FILM NUMBER: 26914940 BUSINESS ADDRESS: STREET 1: 8701 RED OAK BLVD. CITY: CHARLOTTE STATE: NC ZIP: 28217 BUSINESS PHONE: (419) 626-0830 MAIL ADDRESS: STREET 1: 8701 RED OAK BLVD. CITY: CHARLOTTE STATE: NC ZIP: 28217 FORMER COMPANY: FORMER CONFORMED NAME: CopperSteel HoldCo, Inc. DATE OF NAME CHANGE: 20231027 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: VANGUARD PORTFOLIO MANAGEMENT LLC CENTRAL INDEX KEY: 0002100121 ORGANIZATION NAME: EIN: 392888838 STATE OF INCORPORATION: PA FISCAL YEAR END: 1231 LEGAL ENTITY IDENTIFIER: 529900YN99W7NU4H6B84 FILING VALUES: FORM TYPE: SCHEDULE 13G BUSINESS ADDRESS: STREET 1: 100 VANGUARD BLVD CITY: MALVERN STATE: PA ZIP: 19355 BUSINESS PHONE: 610-669-6148 MAIL ADDRESS: STREET 1: 100 VANGUARD BLVD CITY: MALVERN STATE: PA ZIP: 19355 SCHEDULE 13G 1 primary_doc.xml X0202 SCHEDULE 13G 0002100121 XXXXXXXX LIVE Common Stock 03/31/2026 0001999001 Six Flags Entertainment Corp 83001C108 8701 Red Oak Blvd Charlotte NC 28217 Rule 13d-1(b) Vanguard Portfolio Management PA 74069 0 5214914 0 5214914 5.11 IA In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Portfolio Management LLC and the following affiliates of Vanguard Portfolio Management LLC or business divisions of such affiliates: Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Portfolio Management LLC, or business divisions of such subsidiaries whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release. Six Flags Entertainment Corp 8701 Red Oak Blvd, Charlotte, NC, 28217 Vanguard Portfolio Management 100 Vanguard Blvd,, Malvern, PA, 19355 PA N IA 5214914 5.11 74069 0 5214914 0 Y N Vanguard Portfolio Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Vanguard Portfolio Management Ashley Grim 04/29/2026