Six Flags Entertainment (FUN) CEO adds 15,713 shares in 10b5-1 purchase

Rhea-AI Filing Summary

Six Flags Entertainment Corporation/NEW President & CEO John T. Reilly purchased 15,713 shares of common stock on August 12, 2026 at $15.80 per share. Following this open-market transaction, his direct holdings increased to 297,736 shares. The purchase was effected under a Rule 10b5-1 trading plan adopted on May 12, 2026.

Insider Trade Summary 10b5-1

Net Buyer: 15,713 shares

Net Buy 1 txn

Insider Reilly John T

Role President & CEO

Bought 15,713 shs ($248K)

Type	Security	Shares	Price	Value
Purchase	Common Stock, par value $0.01 per share F1	15,713	$15.80	$248K

Holdings After Transaction: Common Stock, par value $0.01 per share — 297,736 shares (Direct)

Footnotes (1)

1. 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.

Key Figures

Shares purchased: 15,713 shares Purchase price: $15.80 per share Post-transaction holdings: 297,736 shares +2 more

5 metrics

Shares purchased 15,713 shares Common stock bought on August 12, 2026

Purchase price $15.80 per share Price paid for common stock on August 12, 2026

Post-transaction holdings 297,736 shares Direct ownership after the reported purchase

Net buy shares 15,713 shares Net shares bought across all transactions in this Form 4

10b5-1 plan adoption date May 12, 2026 Date CEO adopted Rule 10b5-1 trading plan

Key Terms

Rule 10b5-1 trading plan, Form 4, par value

3 terms

Rule 10b5-1 trading plan regulatory

"The purchase reported was effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Form 4 regulatory

"The purchase reported in this Form 4 was effected pursuant to a Rule 10b5-1"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

par value financial

"Common Stock, par value $0.01 per share"

Par value is the fixed amount printed on a bond or stock that represents its original value when issued. It’s like the face value of a coin or bill—what the issuer promises to pay back or the starting price of a stock—though it often doesn’t change with market prices. It matters because it helps determine certain financial details, like how much the company will pay back at maturity.

FAQ

What insider transaction did FUN’s CEO John T. Reilly report?

John T. Reilly reported a purchase of 15,713 FUN shares on August 12, 2026 at $15.80 per share. This open-market transaction increased his direct holdings to 297,736 shares of Six Flags Entertainment Corporation/NEW common stock.

Was the recent FUN insider share purchase made under a 10b5-1 plan?

Yes. The 15,713-share purchase of FUN stock on August 12, 2026 was effected under a Rule 10b5-1 trading plan adopted by John T. Reilly on May 12, 2026, indicating a pre-arranged trading framework.

How many FUN shares does CEO John T. Reilly own after this transaction?

After purchasing 15,713 shares at $15.80 on August 12, 2026, John T. Reilly directly owns 297,736 shares of Six Flags Entertainment Corporation/NEW common stock, as reported in the Form 4 insider filing.

What price did FUN’s CEO pay per share in the latest insider buy?

John T. Reilly paid $15.80 per share for 15,713 shares of FUN common stock on August 12, 2026. The filing describes this as a purchase in an open-market or private transaction, executed under a Rule 10b5-1 plan.

Does the FUN Form 4 show any insider stock sales by John T. Reilly?

No. The Form 4 reports only a net-buy transaction of 15,713 shares at $15.80 per share, increasing John T. Reilly’s direct holdings to 297,736 shares, with no insider sales disclosed in this filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 04:44 PM Accepted by SEC EDGAR 08/12/2026 - 04:43 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Reilly John T

(Last) (First) (Middle)

C/O SIX FLAGS ENTERTAINMENT CORPORATION

8701 RED OAK BLVD

(Street)

CHARLOTTE NORTH CAROLINA 28217

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Six Flags Entertainment Corporation/NEW [ FUN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.01 per share	08/12/2026		P		15,713(1)	A	$15.8	297,736	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

Remarks:

	/s/ John Reilly	08/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)