# EDGAR Filing Document

**Accession Number:** 0001999001
**File Stem:** 0001193125-26-148589
**Filing Date:** 2026-4
**Character Count:** 5373
**Document Hash:** 9b825d2c2f50931e115ff30c455aa733
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-148589.hdr.sgml**: 20260409

**ACCESSION NUMBER**: 0001193125-26-148589

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260408

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260409

**DATE AS OF CHANGE**: 20260408

**FILER**: 

**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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42157
- **FILM NUMBER:** 26849650

**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

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): April 8, 2026

## SIX FLAGS ENTERTAINMENT CORPORATION

#### (Exact name of Registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-42157** | **93-4097909** |
| **(State or other jurisdiction<br>of incorporation)** | **(Commission**<br> **File No.)** | **(I.R.S. Employer<br>Identification No.)** |

---

#### 8701 Red Oak Blvd.,

#### Charlotte, North Carolina 28217

#### (Address of principal executive offices) (Zip Code)
(704) 414-4700

#### (Registrant's telephone number, including area code)

#### Not Applicable

#### (Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

#### Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br> **Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, par value $0.01 per share | FUN | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

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| | |
|:---|:---|
| **Item 7.01.** | **Regulation FD Disclosure.**  |

---

On April 8, 2026, Six Flags Entertainment Corporation (the "<u>Company</u>") announced that its subsidiary Six Flags America Property Corporation, entered into a purchase agreement to sell certain real property located in Prince George's County, Maryland, to a joint venture between 35V, the investment firm co-founded by NBA champion Kevin Durant and Rich Kleiman, and Atlanta-based TPA Group (the "<u>Transaction</u>"). The Transaction is subject to buyer's diligence and other closing conditions. The Company expects to use net proceeds from the Transaction to pay down the Company's debt obligations.

The information furnished pursuant to this Item 7.01 shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "<u>Exchange Act</u>"), and shall not be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

---

| | |
|:---|:---|
| **Item 9.01** | **Financial Statements and Exhibits.**  |

---

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| | |
|:---|:---|
| **Exhibit<br>Number** | **Description** |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  |  | SIX FLAGS ENTERTAINMENT CORPORATION |
|  |  | (Registrant) |
| Date: April 8, 2026 | By: | /s/ Brian C. Witherow |
|  |  | Brian C. Witherow<br> Chief Financial Officer |

---