Changes in Beneficial Ownership · 4

Six Flags Entertainment Corporation

FUNNYSEEQUITYCurrent

Changes in Beneficial Ownership

Filed Aug 12, 2026Accepted Aug 12, 2026, 4:43 PM EDTFiling CIK 1999001Accession 0001671356-26-000005

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Structured filing — 4

wk-form4_1786567427.xml

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Filing details

Report period: 2026-08-12
Issuer: Six Flags Entertainment Corporation/NEW
Issuer CIK: 0001999001
Trading symbol: FUN
Rule 10b5-1 indication: Checked

Reporting owner 1

Name: Reilly John T
Reporting owner CIK: 0001671356
Relationship: Director · Officer
Officer title: President & CEO
Address: C/O SIX FLAGS ENTERTAINMENT CORPORATION, 8701 RED OAK BLVD, CHARLOTTE, NC, 28217

Non-derivative transactions

Non-derivative transactions · 1 reported row
Security	Transaction date	Code	Amount	A / D	Price (USD)	Owned after	Ownership
Common Stock, par value $0.01 per share	2026-08-12	P · Form 4	15,713^[F1]	A	15.80	297,736	D

Table key

P · Form 4: Purchase on the market or privately
A: Acquired
D: Direct

Footnotes

F1: The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2026.↩ 1

Signature 1

Signed: /s/ John Reilly
Date: 2026-08-12

Company context

Six Flags Entertainment Corporation (NYSE: FUN) is North America’s largest regional amusement-resort operator, with 20 amusement parks, 14 water parks and nine resort properties across 13 states in the U.S., Canada, and Mexico. The Company also manages an amusement park in Saudi Arabia. Focused on its purpose of creating FUN, thrills and a lifetime of memories, Six Flags provides immersive entertainment to millions of guests every year with world-class coasters, themed rides, thrilling water parks, resorts and a portfolio of beloved intellectual property such as Looney Tunes®, DC Comics® and PEANUTS®.

Current securities

FUNNYSE · EQUITY · Current

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