CopperSteel HoldCo, Inc.
SEC Filing List

CIK: 0001999001

Form Type:

Year

Form	Description	Owner/Filer	Filing Agent	Date	Actions
DEF 14A	Definitive proxy statements	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	04/09/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
ARS	Annual report to security holders	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	04/09/2026	View ... Create Alert Filing info Download PDF Copy Link
8-K	Current report filing	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	04/09/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
3	Initial statement of beneficial ownershi...	Haddrill Richard M	Six Flags Entertainment Corporation/new	04/06/2026	View ... Create Alert Filing info Download PDF Copy Link
8-K	Current report filing	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	04/06/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
SCHEDULE 13G/A				03/27/2026	View ... Create Alert Filing info Download PDF Copy Link
8-K	Current report filing	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	03/25/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
8-K	Current report filing	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	03/13/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
8-K	Current report filing	Six Flags Entertainment Corporation/new	DONNELLEY FINANCIAL SOLUTIONS /FA/	03/05/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
10-K	Annual report pursuant to Section 13 and...	Six Flags Entertainment Corporation/new		02/26/2026	View ... Create Alert Filing info Download PDF Copy Link View XBRL Download CSV
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