# EDGAR Filing Document

**Accession Number:** 0001262823
**File Stem:** 0001193125-26-271206
**Filing Date:** 2026-6
**Character Count:** 8218
**Document Hash:** a49d7fd33c96cfcd04bcee35024ede3d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-271206.hdr.sgml**: 20260615

**ACCESSION NUMBER**: 0001193125-26-271206

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260615

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260615

**DATE AS OF CHANGE**: 20260615

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WESTLAKE CORP
- **CENTRAL INDEX KEY:** 0001262823
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL ORGANIC CHEMICALS [2860]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 760346924
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32260
- **FILM NUMBER:** 261091526

**BUSINESS ADDRESS:**
- **STREET 1:** 2801 POST OAK BLVD
- **STREET 2:** SUITE 600
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77056
- **BUSINESS PHONE:** 713-960-9111

**MAIL ADDRESS:**
- **STREET 1:** 2801 POST OAK BLVD
- **STREET 2:** SUITE 600
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77056

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WESTLAKE CHEMICAL CORP
- **DATE OF NAME CHANGE:** 20030908

?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): June 15, 2026

## Westlake Corporation

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

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-32260** | **76-0346924** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **2801 Post Oak Boulevard, Suite 600** |  |
| **Houston, Texas** | **77056** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

#### Registrant's telephone number, including area code: (713) 960-9111
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:

☐ 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, $0.01 par value | WLK | The New York Stock Exchange |
| 1.625% Senior Notes due 2029 | WLK29 | The New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in 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. ☐

------

#### Item 7.01 Regulation FD Disclosure
On June 15, 2026, Westlake Corporation (the "Company") issued a press release announcing that Westlake Vinnolit GmbH & Co. KG, a wholly owned subsidiary of the Company, has completed the previously announced acquisition of a polyvinyl chloride and vinyl chloride monomer production site located in Wilhelmshaven, Germany. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

The information furnished pursuant to this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liability of such section, nor shall such information be deemed incorporated by reference into any filing by the Company under the Securities Act of 1933, as amended, or the Exchange Act, unless specifically identified as being incorporated therein.

#### Item 9.01 Financial Statements and Exhibits.
(d) Exhibits

---

| | |
|:---|:---|
| 99.1 | [Press release issued on June 15, 2026.](d166027dex991.htm) |
| 104 | The cover page from this Current Report on Form 8-K, formatted in Inline XBRL. |

---

------

#### SIGNATURE
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.

---

| | | |
|:---|:---|:---|
|  |  | **WESTLAKE CORPORATION** |
| Date: June 15, 2026 | By: | /s/ L. Benjamin Ederington |
|  |  | L. Benjamin Ederington<br> **Executive Vice President, Legal and External Affairs** |

---

## Exhibit 99.1

**Exhibit 99.1** 

**WESTLAKE EXPANDS GLOBAL CHLOROVINYLS MANUFACTURING CAPACITY WITH** 

**ACQUISITION OF PVC AND VCM PLANTS IN WILHELMSHAVEN, GERMANY** 

**Houston, June 15, 2026 -** Westlake Corporation (NYSE: WLK) ("Westlake") announced today that its German subsidiary, Westlake Vinnolit GmbH & Co. KG, has completed the previously-announced acquisition of a polyvinyl chloride and vinyl chloride monomer production site located in Wilhelmshaven, Germany (the "Wilhelmshaven plant"). The Wilhelmshaven plant, which was previously in insolvency administration, has the capacity to produce 380,000 metric tons of PVC per year.

"This acquisition strengthens our Performance & Essential Materials business by expanding our global chlorovinyls manufacturing footprint and complements our existing chlorovinyl production facilities in Europe and North America," said Jean-Marc Gilson, President and Chief Executive Officer of Westlake. "The Wilhelmshaven plant, which is located in Lower Saxony on Germany's North Sea coast, benefits from advantageous logistical infrastructure, including a deep-water dock that enables efficient raw-materials supply. We look forward to welcoming the site's employees to our Westlake family."

**About Westlake** 

Celebrating 40 years of operations in 2026, Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, with operations in Asia, Europe and North America, we provide the building blocks for vital solutions — from housing and construction, to packaging and healthcare, to automotive and consumer goods. For more information, visit Westlake's web site at <u>www.westlake.com</u>.

**Forward-Looking Statements** 

The statements in this release that are not historical statements, including statements regarding the anticipated benefits of the acquisition and the opportunities provided thereby, are forward-looking statements within the meaning of the federal securities laws. These forward-looking statements are subject to significant risks and uncertainties, many of which are beyond Westlake's control. Actual results could differ materially based on risks and uncertainties described in Westlake's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which was filed with the Securities and Exchange Commission ("SEC") in February 2026, and Westlake's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, which was filed with the SEC in May 2026. These filings also discuss some of the important risk factors that may affect Westlake's business, results of operations and financial condition. Westlake undertakes no obligation to revise or update publicly any forward-looking statements except as required by applicable law.

**Contacts** 

*Media Inquiries:* Benjamin Ederington, 713-960-9111;

*Investor Inquiries:* Jeff Holy, 713-960-9111