Jonathan A. Brudnick - Oct 17, 2025 Form 3 Insider Report for Six Flags Entertainment Corporation/NEW (FUN)

Role
Director
Signature
/s/ Michael D. Adamski, as Attorney-in-Fact
Stock symbol
FUN
Transactions as of
Oct 17, 2025
Transactions value $
$0
Form type
3
Date filed
10/27/2025, 06:29 PM

Reporting Owners (5)

Name Relationship Address Signature Signature date CIK
Brudnick Jonathan A. Director 250 WEST 55TH STREET,, FLOOR 34, NEW YORK /s/ Michael D. Adamski, as Attorney-in-Fact 2025-10-27 0002092404
Ferguson Scott D. Director 250 WEST 55TH STREET,, FLOOR 34, NEW YORK /s/ Michael D. Adamski, as Attorney-in-Fact 2025-10-27 0001658919
Sachem Head Capital Management LP Director 250 WEST 55TH STREET,, FLOOR 34, NEW YORK /s/ Michael D. Adamski, as General Counsel 2025-10-27 0001582090
Uncas GP LLC Director 250 WEST 55TH STREET,, FLOOR 34, NEW YORK /s/ Michael D. Adamski, as General Counsel 2025-10-27 0001658906
Sachem Head GP LLC Director 250 WEST 55TH STREET,, FLOOR 34, NEW YORK /s/ Michael D. Adamski, as General Counsel 2025-10-27 0001658917

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding FUN Common Stock, par value $0.01 per share 5.03M Oct 17, 2025 See footnotes F1, F2, F3, F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding FUN Cash Settled Swap Oct 17, 2025 Common Stock 2.21M $28.69 See footnotes F1, F2, F3, F4, F5, F6
holding FUN Cash Settled Swap Oct 17, 2025 Common Stock 1.61M $28.61 See footnotes F1, F2, F3, F4, F5, F6
holding FUN Cash Settled Swap Oct 17, 2025 Common Stock 1.18M $29.06 See footnotes F1, F2, F3, F4, F5, F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 In addition to Jonathan Brudnick, this Form 3 is being filed jointly by Sachem Head Capital Management LP ("Sachem Head"), Uncas GP LLC ("SH Management"), Sachem Head GP LLC ("Sachem Head GP"), and Scott D. Ferguson, a citizen of the United States (Mr. Ferguson and, together with Sachem Head, SH Management, Sachem GP, and Mr. Brudnick, the "Reporting Persons"). Each of the Reporting Persons has the same business address as Mr. Brudnick and may be deemed to be the beneficial owner of certain of the securities reported on this Form 3 (the "Subject Securities") for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.
F2 Includes securities directly owned by Sachem Head LP ("SH"), Sachem Head Master LP ("SHM"), and SH Stony Creek Master Ltd. ("Stony Creek Master" and, together with SH and SHM, the "Sachem Head Funds"). Each of Sachem Head, as the investment adviser to the Sachem Head Funds, SH Management, as the sole general partner of Sachem Head, and Scott D. Ferguson, as the managing partner of Sachem Head may be deemed to beneficially own the securities directly owned by the Sachem Head Funds. As the general partner of SH and SHM, Sachem Head GP may be deemed to beneficially own the securities directly owned by SH and SHM.
F3 The principal business of Sachem Head is to serve as investment advisor to certain affiliated funds, including the Sachem Head Funds. The principal business of SH Management is to serve as the sole general partner of Sachem Head. The principal business of Sachem Head GP is to serve as the general partner of certain affiliated funds, including SH and SHM. The principal occupation of Scott D. Ferguson is to serve as the managing partner of Sachem Head and the managing member of SH Management and Sachem Head GP.
F4 Jonathan Brudnick is a partner at Sachem Head and also serves on the board of directors of Six Flags Entertainment Corporation (the "Issuer"). As a result, the Reporting Persons other than Mr. Brudnick may be deemed directors of the Issuer by deputization.
F5 Under the cash-settled total return swaps referencing in the aggregate 4,995,000 shares of common stock (the "Cash Settled Swaps"), the respective Sachem Head Fund became a party to contracts with unaffiliated third party financial institutions pursuant to which a cash payment will be made by the counterparty to the respective Sachem Head Fund if the price of a share on the expiration date exceeds the reference price in column 4 and a cash payment will be made by the respective Sachem Head Fund to the counterparty if the price of a share on the expiration date is less than the reference price in column 4.
F6 The Cash Settled Swaps do not give any Reporting Person direct or indirect voting, investment or dispositive control over any securities of the Issuer and do not require the counterparty thereto to acquire, hold, vote or dispose of any securities of the Issuer. Accordingly, the Reporting Persons disclaim any beneficial ownership of any Shares that may be referenced in the swap contracts or shares or other securities or financial instruments that may be held from time to time by any counterparty to the contracts.

Remarks:

Exhibit 24.1 - Power of Attorney. Exhibit 24.2 - Power of Attorney.