# EDGAR Filing Document

**Accession Number:** 0001262823
**File Stem:** 0001193125-25-318445
**Filing Date:** 2025-12
**Character Count:** 24306
**Document Hash:** 82ff04040bd2de7239687ea1dd533af4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-318445.hdr.sgml**: 20251215

**ACCESSION NUMBER**: 0001193125-25-318445

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 20

**CONFORMED PERIOD OF REPORT**: 20251212

**ITEM INFORMATION**: Cost Associated with Exit or Disposal Activities

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251215

**DATE AS OF CHANGE**: 20251215

**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:** 251570022

**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): December 12, 2025

## 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**<br> **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 | WLK 29 | 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. ☐

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| | |
|:---|:---|
| **Item 2.05.** | **Costs Associated with Exit or Disposal Activities.**  |

---

On December 12, 2025, Westlake Corporation (the "Company") approved a plan to cease operation of certain of the Company's North American chlorovinyl production facilities, including (i) its polyvinyl chloride ("PVC") plant at the Aberdeen, Mississippi site, which has an annual capacity of approximately 1 billion pounds of suspension PVC, (ii) its vinyl chloride monomer ("VCM") plant at the Lake Charles, Louisiana North site, which has an annual capacity of approximately 910 million pounds of VCM, and (iii) one of its diaphragm chlor-alkali units at the Lake Charles, Louisiana South site, which has an annual capacity of approximately 825 million pounds of chlorine and 910 million pounds of caustic soda. The Company plans to continue supplying customers with PVC, VCM and chlor-alkali products from its seven other North American chlorovinyl facilities. Following the closures, the Company expects to have aggregate annual production capacity of approximately (i) 5,520 million pounds of suspension PVC globally, including 4,900 million pounds in North America, (ii) 7,630 million pounds of VCM globally, including 6,050 million pounds in North America, and (iii) 6,680 million pounds of chlorine and 7,510 million pounds of caustic soda globally, including 5,410 million pounds of chlorine and 6,100 million pounds of caustic soda in North America.

On December 12, 2025, the Company also approved a plan to cease operation of its styrene production plant located at the Lake Charles, Louisiana site, which has an annual production capacity of approximately 570 million pounds of styrene.

On December 15, 2025, the Company notified the affected employees at each of the facilities of the Company's plan. Cessation of operations at the affected facilities is expected to take place in December 2025. The closures of the facilities are expected to result in a workforce reduction of approximately 295 employees. The Company expects it will incur total pre-tax costs of approximately $415 million related to the closures of the facilities consisting of noncash accelerated depreciation, amortization, and asset write-off charges of approximately $357 million, employee severance and separation costs of approximately $25 million, and other plant shut down costs of approximately $33 million.

The Company expects to recognize a substantial portion of the non-cash accelerated depreciation, amortization, and asset write-off charges, employee severance and separation costs, and other plant shut down costs in the fourth quarter of 2025, although cash outflows are expected over several years through the completion of the anticipated closures.

Given that the Company is in the early stages of the process, the amount and timing of some of these expected costs are uncertain. The Company will amend this Current Report on Form 8-K or disclose in another periodic filing with the Securities and Exchange Commission ("SEC"), if appropriate, the amount of any other related charges or costs, once they are determinable.

---

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

---

On December 15, 2025, the Company issued a press release and posted a slide presentation on its website to provide supplemental information regarding the Company's plan to close the facilities and an update to its Performance & Essential Materials operating segment ("PEM") profitability improvement plan. Copies of the press release and the slide presentation are furnished with this Current Report on Form 8-K as Exhibits 99.1 and 99.2, respectively.

The Company is holding a conference call on December 15, 2025 to discuss the planned facility closures and to provide updates on its PEM profitability improvement plan and its financial performance during the fourth quarter of 2025. Information about the call can be found in the press release furnished with this Current Report on Form 8-K as Exhibit 99.1.

The information furnished pursuant to this Item 7.01, including Exhibits 99.1 and 99.2, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by the Company under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein.

#### Forward-Looking Statements
The statements in this Current Report on Form 8-K that are not historical facts, including statements regarding the timing of the anticipated cessation of certain operations at the Aberdeen, Mississippi; Lake Charles, Louisiana North; Lake Charles, Louisiana South; and Lake Charles, Louisiana Styrene sites, the anticipated effects of such closures on production capacity, the estimated pre-tax costs and expected cash outflows associated with a closure of such facilities and other effects of an anticipated closure, are forward-looking statements within the meaning of the U.S. securities laws. These forward-looking statements are subject to significant risks and uncertainties, many of which are beyond the Company's control. Actual results could differ materially, based on factors including, but not limited to, the ultimate cost of closure of such facilities, the outcome of consultations with unions and other risks and uncertainties. For more detailed information about the factors that could cause actual results to differ materially, please refer to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which was filed with the SEC on February 25, 2025, and the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, which was filed with the SEC on October 31, 2025.

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

---

(d) Exhibits

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| | |
|:---|:---|
| **Exhibit**<br> **Number** | **Description** |
| 99.1 | [Press release issued by Westlake Corporation on December 15, 2025.](d798286dex991.htm) |
| 99.2 | [Investor slide presentation dated December 15, 2025.](d798286dex992.htm) |
| 104 | Cover Page Interactive Data File, formatted in Inline XBRL. |

---

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#### 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: | December 15, 2025 | By: | /s/ L. Benjamin Ederington |
|  |  |  | L. Benjamin Ederington<br> **Executive Vice President, Legal and External Affairs** |

---

## Exhibit 99.1

**Exhibit 99.1** 

**Westlake to Rationalize Certain North American Chlorovinyl and Styrene Assets** 

**HOUSTON, December 15, 2025 —** Westlake Corporation (NYSE: WLK) ("Westlake") (the "Company") announced today that the Company has approved a plan to cease operation of certain of the Company's North American chlorovinyl production facilities, including:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• its polyvinyl chloride ("PVC") plant at the Aberdeen, Mississippi site, which has an annual capacity
of approximately 1 billion pounds of suspension PVC resin;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• its vinyl chloride monomer ("VCM") plant at the Lake Charles, Louisiana North site, which has an
annual capacity of approximately 910 million pounds of VCM; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• one of its diaphragm chlor-alkali units at the Lake Charles, Louisiana South site, which has an annual capacity
of approximately 825 million pounds of chlorine and 910 million pounds of caustic soda.

The Company plans to continue supplying customers with PVC, VCM and chlor-alkali products from its seven other North American chlorovinyl facilities. Following the closures, the Company expects to have aggregate annual production capacity of approximately (i) 5,520 million pounds of suspension PVC globally, including 4,900 million pounds in North America, (ii) 7,630 million pounds of VCM globally, including 6,050 million pounds in North America, and (iii) 6,680 million pounds of chlorine and 7,510 million pounds of caustic soda globally, including 5,410 million pounds of chlorine and 6,100 million pounds of caustic soda in North America.

The Company also approved a plan to cease operation of its styrene production plant located at the Lake Charles, Louisiana site, which has an annual production capacity of approximately 570 million pounds of styrene.

Cessation of operations at the affected facilities is expected to take place in December 2025. The closures of the facilities are expected to result in a workforce reduction of approximately 295 employees. The Company expects it will incur total pre-tax costs of approximately $415 million related to the closures of the facilities consisting of noncash accelerated depreciation, amortization, and asset write-off charges of approximately $357 million, employee severance and separation costs of approximately $25 million, and other plant shut down costs of approximately $33 million.

"Given the persistent, challenging market conditions facing the global commodities chemicals industry, as part of our evaluation of business operations, we have made the difficult decision to cease operation of three units within our North American Chlorovinyls business and cease operations of our Styrene manufacturing unit, located in Lake Charles, Louisiana. We will continue to supply our chlorovinyl customers with products produced at our other North American Chlorovinyls manufacturing facilities," said Westlake President and Chief Executive Officer Jean-Marc Gilson. "I want to recognize the dedication and contributions of all our employees, including the ones who will be leaving us. We appreciate their contribution over the years. We are committed to treating everyone impacted with respect and our focus is on supporting them through their transition."

------

The Company expects to recognize a substantial portion of the non-cash accelerated depreciation, amortization, and asset write-off charges, employee severance and separation costs, and other plant shut down costs in the fourth quarter of 2025, although cash outflows are expected over several years through the completion of the anticipated closures.

**CONFERENCE CALL** 

Westlake will host a conference call on Monday, December 15, 2025, at 10:00 AM Eastern Time (9:00 AM Central Time) to discuss the planned facility closures and to provide updates on its Performance & Essential Materials operating segment profitability improvement plan and its financial performance during the fourth quarter of 2025. Participants on the call will include Chief Executive Officer Jean-Mac Gilson, Chief Financial Officer Steve Bender and Chief Accounting Officer Jeff Holy. A slide presentation that accompanies the call will be available at <u>https://investors.westlake.com/events-and-presentations/default.aspx</u>.

To access the conference call, it is necessary to pre-register at <u>https://register-conf.media-server.com/register/BI8d9b160883574afbb4b56c8652362df5</u>. Once registered, you will receive a phone number and unique PIN number. A replay of the conference call will be available beginning two hours after its conclusion at <u>https://investors.westlake.com/events-and-presentations/default.aspx</u>.

**About Westlake** 

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.

**Contacts** 

*Media Inquiries*: Ben Ederington, 713-960-9111

*Investor Inquiries*: Steve Bender, 713-960-9111

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**Forward-Looking Statements** 

The statements in this press release that are not historical facts, including statements regarding the timing of the anticipated cessation of certain operations at the Aberdeen, Mississippi, Lake Charles, Louisiana North, Lake Charles, Louisiana South and Lake Charles, Louisiana Styrene sites, the anticipated effects of such closures on production capacity, the estimated pre-tax costs and expected cash outflows associated with a closure of such facilities and other effects of an anticipated closure, are forward-looking statements within the meaning of the U.S. securities laws. These forward-looking statements are subject to significant risks and uncertainties, many of which are beyond the Company's control. Actual results could differ materially, based on factors including, but not limited to, the ultimate cost of closure of such facilities, the outcome of consultations with unions and other risks and uncertainties. For more detailed information about the factors that could cause actual results to differ materially, please refer to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which was filed with the SEC on February 25, 2025, and the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, which was filed with the SEC on October 31, 2025.

###

## Exhibit 99.2

**Exhibit 99.2**![LOGO](g798286dsp008.jpg)

Performance & Essential Materials Segment (PEM) Profitability Improvement Plan Update December 15, 2025

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![LOGO](g798286dsp009.jpg)

PEM Profitability Improvement Plan Update PEM profitability has been pressured by low market pricing as the result of global overcapacity in certain products, primarily the chlorovinyls chain and styrene, and an increase in low-priced Asian exports We are extending our footprint optimization to include the shutdown of three North American chlorovinyl plants that are higher cost and serve low-priced export markets We are also taking strategic action to exit the styrene business due to an unfavorable near- and long-term outlook for exports These actions are expected to improve annual EBITDA by ~$100MM with FCF savings of ~$175MM in 2026; and <1 year payback on ~$58MM of cash costs to execute the plan Following these optimization actions, we will be better positioned to serve our valued customers as a leading global chlorovinyls producer Our Profitability Improvement Plan Targets Returning PEM's Return on Investment to an Appropriate Level 2

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![LOGO](g798286dsp010.jpg)

Manufacturing Footprint Optimization Update Following a thorough analysis we have determined that three of our North American chlorovinyls plants are no longer globally cost-competitive due to their high production and logistics cost burden to serve the low-priced export market We are also taking strategic action to exit the styrene business due to an WLK Global Capacity Change unfavorable near- and long-term outlook for exports As a result, we will cease operations at these facilities by the end of 2025 Caustic PVC(1) 9,000 7,000 8,000 % of WLK 6,000 Facility Product Capacity Global Capacity 7,000 5,000 Lake Charles, LA Chlor-alkali 825MM lbs Chlorine 11% 6,000 Pounds 5,000 Pounds 4,000 South Plant A 910MM lbs Causticofof 4, 000 3,000 Lake Charles, LA VCM 910MM lbs 11% Millions 3,000 Millions 2,000 North 2,000 1,000 Aberdeen, MS PVC 1,000MM lbs 15% 1,000 0 0 Lake Charles, LA Styrene 570MM lbs 100% 2025 2026 2025 2026 Footprint Optimization To Include North American Chlorovinyls And Styrene (1) Excludes Specialty PVC capacity 3

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![LOGO](g798286dsp011.jpg)

Proactive Performance Steps to Drive Improved We expect to take one-time charges totaling ~$415MM in 4Q'25 consisting of a ~$357MM non-cash accelerated depreciation, amortization, and asset write-off charge; the accrual of ~$25MM for employee severance and separation costs; and ~$33MM for other plant shutdown costs We expect these manufacturing footprint optimization efforts to result in an annual EBITDA improvement of ~$100MM with Free Cash Flow savings of ~$175MM in 2026; and <1 year payback on the ~$58MM cash costs needed to execute the plan With these actions, each of the three pillars of our PEM Profitability Improvement Plan is now expected to generate ~$200MM annual EBITDA uplift totaling ~$600MM per year starting in 2026 ~$200MM ~$200MM ~$200MM Pernis Closure(1) ~$100MM NA Chlorovinyls & ~$100MM Styrene Closures Total Footprint ~$200MM Optimization Footprint Cost Savings Improved Plant Optimization Reliability Profitability Improvement Plan Drives ~$600MM Per Year of EBITDA Self Help (1) On June 17, 2025, Westlake announced the closure of its Epoxy site in Pernis, The Netherlands, which had been generating annual losses of ~$100MM 44

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![LOGO](g798286dsp012.jpg)

Safe Harbor Language This presentation contains certain forward-looking statements including statements regarding our cost-saving objectives, the timing of the anticipated cessation of operations at certain of our production facilities, the anticipated effects of such closures on production capacity, the estimated pre-tax costs and expected cash outflows associated with a closure of such facilities, our cost control and efficiency efforts, and the anticipated savings and additional EBITDA and free cash flow resulting therefrom, our expected fourth quarter financial performance, including expectations regarding EBITDA, EBITDA margin and cash interest expense, outlook for the global market, including raw material costs, our competitive position, anticipated residential construction, repair and remodel activities and infrastructure growth, our energy and feedstock cost advantages in the North American chemicals market, trends in key product markets, our capital allocation strategy, our ability to cross-sell across our businesses, supply and demand dynamics as they relate to our products, and our ability to maintain a disciplined investment culture focused on efficient capital allocation. Actual results may differ materially depending on factors, including, but not limited to, the following: general economic and business conditions; the cyclical nature of the chemical and building products industries; the availability, cost and volatility of raw materials and energy; uncertainties associated with the United States, European and worldwide economies, including those due to political tensions and conflict in the Middle East, Russia, Ukraine and elsewhere; uncertainties associated with pandemic infectious diseases; uncertainties associated with climate change; the potential impact on the demand for ethylene, polyethylene and polyvinyl chloride due to initiatives such as recycling and customers seeking alternatives to polymers; current and potential governmental regulatory actions in the United States and other countries; industry production capacity and operating rates; the supply/demand balance for our products; competitive products and pricing pressures; instability in the credit and financial markets; access to capital markets; terrorist acts; operating interruptions; changes in laws or regulations, including trade policies and tariffs imposed on or by foreign jurisdictions; disruptions in global trade and the effect on trading relationships between the United States and other countries; technological developments; information systems failures and cyber attacks; foreign currency exchange risks; our ability to implement our business strategies; creditworthiness of our customers; and other factors described in our reports filed with the Securities and Exchange Commission. Many of these factors are beyond our ability to control or predict. Any of these factors, or a combination of these factors, could materially affect our future results of operations and the ultimate accuracy of the forward-looking statements. These forward-looking statements are not guarantees of our future performance, and our actual results and future developments may differ materially from those projected in the forward-looking statements. Management cautions against putting undue reliance on forward-looking statements. Every forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements. Investor Relations Contacts Steve Bender -Executive Vice President & Chief Financial Officer Jeff Holy -Vice President & Chief Accounting Officer Westlake Corporation 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 713-960-9111 5