Westlake (NYSE: WLK) closes Wilhelmshaven PVC, VCM plant acquisition

Rhea-AI Filing Summary

Westlake Corporation, through its wholly owned German subsidiary Westlake Vinnolit GmbH & Co. KG, has completed the previously announced acquisition of a polyvinyl chloride (PVC) and vinyl chloride monomer (VCM) production site in Wilhelmshaven, Germany.

The Wilhelmshaven plant, which was previously in insolvency administration, has capacity to produce 380,000 metric tons of PVC per year. Westlake states that the acquisition strengthens its Performance & Essential Materials business by expanding its global chlorovinyls manufacturing footprint and complements existing facilities in Europe and North America.

The site benefits from a deep-water dock on Germany’s North Sea coast, which is expected to support efficient raw-materials supply and logistics. Westlake also highlights the integration of the plant’s employees into its broader organization as part of this expansion.

Insights

Chemicals industry analyst

Westlake adds large European PVC/VCM capacity via Wilhelmshaven acquisition.

Westlake, through Westlake Vinnolit, has closed the acquisition of the Wilhelmshaven PVC and VCM site in Germany. The plant can produce 380,000 metric tons of PVC per year, adding substantial capacity to the company’s chlorovinyls chain.

Management positions this as a strengthening move for the Performance & Essential Materials business, expanding its footprint alongside existing European and North American assets. The site’s deep-water dock and North Sea location may support more efficient feedstock and product logistics, though actual benefits will depend on utilization and market conditions.

The facility was previously in insolvency administration, so successful restart, integration of employees, and capital needs will be important execution factors. Future company filings may provide details on purchase economics, refurbishment costs and the plant’s contribution to segment results after the acquisition date.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Key Figures

PVC production capacity: 380,000 metric tons per year Years of operations: 40 years

2 metrics

PVC production capacity 380,000 metric tons per year Wilhelmshaven plant capacity after acquisition

Years of operations 40 years Westlake celebrating 40 years of operations in 2026

Key Terms

Regulation FD Disclosure, polyvinyl chloride, vinyl chloride monomer, insolvency administration, +1 more

5 terms

Regulation FD Disclosure regulatory

"Item 7.01 Regulation FD Disclosure On June 15, 2026, Westlake Corporation..."

Regulation FD disclosure requires public companies to share important, market-moving information with everyone at the same time instead of tipping off analysts or large investors first. Think of it as making sure all players on a field hear the same announcement simultaneously; that fairness helps investors trust that stock prices reflect the same information and reduces the risk of sudden, unfair trading advantages or regulatory penalties for selective leaks.

polyvinyl chloride financial

"acquisition of a polyvinyl chloride and vinyl chloride monomer production site..."

Polyvinyl chloride (PVC) is a common, sturdy plastic used to make everything from pipes and window frames to medical tubing and wire insulation; think of it as a durable, weather-resistant workhorse material similar to hardened rubber or vinyl. Investors watch PVC because its price, availability, and environmental or safety regulations can affect manufacturing costs, profit margins and sales for many industries that rely on it, so shifts in PVC markets can signal wider supply-chain or regulatory risks and opportunities.

vinyl chloride monomer financial

"acquisition of a polyvinyl chloride and vinyl chloride monomer production site..."

A colorless gas used as the primary raw ingredient to make polyvinyl chloride (PVC), a common plastic found in pipes, siding and packaging; think of it as the flour in a factory that bakes PVC products. It matters to investors because its production, safety record and regulation affect manufacturers’ costs, supply chains and liability risks—accidents, environmental rules or plant shutdowns can change prices, sales and company valuations quickly.

insolvency administration financial

"The Wilhelmshaven plant, which was previously in insolvency administration, has the capacity..."

forward-looking statements regulatory

"The statements in this release that are not historical statements... are forward-looking statements..."

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

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Understanding 8-K Material Events →

WESTLAKE CORP false 0001262823 0001262823 2026-06-15 2026-06-15 0001262823 us-gaap:CommonStockMember 2026-06-15 2026-06-15 0001262823 us-gaap:SeniorNotesMember 2026-06-15 2026-06-15

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 of incorporation)		(Commission File Number)		(I.R.S. Employer 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 Symbol(s)		Name of each exchange 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.
104		The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

2

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 Executive Vice President, Legal and External Affairs

3

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 www.westlake.com.

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

4

FAQ

What acquisition did Westlake (WLK) complete in Wilhelmshaven, Germany?

Westlake completed the acquisition of a polyvinyl chloride (PVC) and vinyl chloride monomer (VCM) production site in Wilhelmshaven, Germany. The deal was executed through its wholly owned German subsidiary, Westlake Vinnolit GmbH & Co. KG, and had been previously announced.

What is the PVC production capacity of Westlake’s new Wilhelmshaven plant?

The Wilhelmshaven plant acquired by Westlake has capacity to produce 380,000 metric tons of PVC per year. This sizeable capacity expands Westlake’s chlorovinyls manufacturing base and is intended to complement existing PVC production facilities in Europe and North America.

How does the Wilhelmshaven acquisition fit Westlake (WLK)’s strategy?

Westlake states the acquisition strengthens its Performance & Essential Materials business by expanding its global chlorovinyls footprint. The added PVC and VCM capacity in Germany is described as complementary to its existing chlorovinyl production network in Europe and North America, supporting broader growth ambitions.

What logistical advantages does Westlake’s Wilhelmshaven plant offer?

The Wilhelmshaven plant is located in Lower Saxony on Germany’s North Sea coast and includes a deep-water dock. Westlake notes this infrastructure supports efficient raw-materials supply and logistics for the site, which could contribute to operational flexibility within its chlorovinyls value chain.

Which Westlake subsidiary owns the Wilhelmshaven PVC and VCM site?

The Wilhelmshaven PVC and VCM site is owned by Westlake Vinnolit GmbH & Co. KG, a wholly owned German subsidiary of Westlake Corporation. This entity completed the acquisition and will operate the facility as part of Westlake’s Performance & Essential Materials business.

What was the prior status of the Wilhelmshaven plant before Westlake’s acquisition?

Before Westlake’s acquisition, the Wilhelmshaven PVC and VCM plant was in insolvency administration. Westlake’s announcement notes this status while emphasizing the site’s production capacity and strategic location, as well as the plan to integrate the plant’s employees into the broader company.

Filing Exhibits & Attachments

5 documents

Press Releases

• EX-99.1 EX-99.1 4.9 KB

Other Documents

• EX-101 XBRL TAXONOMY EXTENSION SCHEMA 4.1 KB
• EX-101 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE 13.3 KB
• EX-101 XBRL TAXONOMY EXTENSION LABEL LINKBASE 22.1 KB
• EX-101 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE 14.3 KB