# Westlake Corp (WLK)

> Cited company facts from SEC filings, by Steadybase. Web page: https://steadybase.io/company/westlake-corp/ JSON: https://steadybase.io/company/westlake-corp.json Checked Nov 10, 2026. Latest filing read: Nov 4, 2026.

## Company

- Legal name: WESTLAKE CORP
- Ticker: WLK (NYSE)
- SEC CIK: 0001262823
- Industry: Industrial Organic Chemicals (SIC 2860)
- Headquarters: Houston, TX
- Fiscal year ends: December 31
- SEC filer category: Large accelerated filer
- Website: westlake.com
- Investor relations: https://westlake.com/#
- LinkedIn: https://www.linkedin.com/company/westlake-corporation
- Next earnings date: Feb 4, 2027 (estimated from past 8-K timing)

## Key facts

- Revenue: $11.2B for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026). Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/0001262823-26-000016-index.html
- Operating income: -$1.6B for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026). Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/0001262823-26-000016-index.html
- Net income: -$1.5B for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026). Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/0001262823-26-000016-index.html
- SG&A: $900.0M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026). Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/0001262823-26-000016-index.html
- Employees: 14,600 as of Dec 31, 2025, as reported in an SEC filing. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/0001262823-26-000016-index.html
- Shares outstanding: 127,886,945 as of Oct 28, 2026 (10-Q filed Nov 4, 2026). Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000080/0001262823-26-000080-index.html
- Auditor: Pricewaterhousecoopers LLP, Houston, Texas, named in the latest 10-K. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm

## Business

Westlake Corporation is a vertically integrated global manufacturer and marketer of both housing and infrastructure products and performance and essential materials that are designed to enhance the lives of people every day. Our products include some of the most widely used materials in the world, which are fundamental to many diverse consumer and industrial markets, including residential construction, flexible and rigid packaging, automotive, healthcare, water treatment, wind turbines, coatings as well as other durable and non-durable goods.

Source: Item 1. Business, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm

## Annual results

| Fiscal year ended | Revenue | Operating income | Net income | SG&A |
|---|---|---|---|---|
| Dec 31, 2025 | $11.2B | -$1.6B | -$1.5B | $900.0M |
| Dec 31, 2024 | $12.1B | $875.0M | $602.0M | $874.0M |
| Dec 31, 2023 | $12.5B | $729.0M | $479.0M | $865.0M |
| Dec 31, 2022 | $15.8B | $3.0B | $2.2B | $835.0M |
| Dec 31, 2021 | $11.8B | $2.8B | $2.0B | $551.0M |

Each figure comes from the annual report for that year. Filing links for every figure: https://steadybase.io/company/westlake-corp.json

## Officers and directors

- Jean-Marc Gilson, President and Chief Executive Officer. LinkedIn: https://linkedin.com/in/jean-marc-gilson-24941a8. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- Jonathan Baksht, SVP and CFO. Source: Form 4 filed Jun 16, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526272102/0001193125-26-272102-index.htm
- Mark Steven Bender, EVP & CFO. Source: Form 4 filed May 14, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526223323/0001193125-26-223323-index.htm
- M. Steven Bender, Executive Vice President and Chief Financial Officer. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- Tommy E. Darby, Vice President, Chief Accounting Officer. LinkedIn: https://linkedin.com/in/tommy-darby-538324101. Source: 8-K filed Aug 31, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526376996/d437911d8k.htm
- Robert F. Buesinger, EVP, PEM Segment Head. Source: Form 4 filed Mar 31, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526133508/0001193125-26-133508-index.htm
- L. Benjamin Ederington, Executive Vice President, Legal and External Affairs. LinkedIn: https://linkedin.com/in/benjamin-ederington-2232779. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- Albert Chao, Executive Chairman. Source: Form 4 filed Aug 11, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526345140/0001193125-26-345140-index.htm
- Albert Y. Chao, Executive Chairman of the Board of Directors. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- James Y. Chao, Senior Chairman of the Board of Directors. LinkedIn: https://linkedin.com/in/james-chao-800078b. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- James Chao, Senior Chairman. Source: Form 4 filed Feb 23, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526063659/0001193125-26-063659-index.htm
- Jeffrey A. Holy, Vice President, Finance and Investor Relations. Source: 8-K filed Aug 31, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526376996/d437911d8k.htm
- Scott T. Szwejbka, Senior Vice President, Housing & Infrastructure Products Segment Head. LinkedIn: https://linkedin.com/in/scott-szwejbka-b8b02738. Source: 10-K filed Feb 26, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- Tommy Darby, VP and CAO. Source: Form 4 filed Sep 1, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526377500/0001193125-26-377500-index.htm
- Brian John Powers, SVP, PEM Segment Head. Source: Form 4 filed Apr 6, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000212696126000004/0002126961-26-000004-index.htm
- Jeffrey Adam Holy, VP and CAO. Source: Form 4 filed Feb 23, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526063705/0001193125-26-063705-index.htm
- Scott Thomas Szwejbka, SVP, HIP Segment Head. Source: Form 4 filed Feb 23, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526063707/0001193125-26-063707-index.htm
- Catherine T. Chao, Board member (per proxy). Source: DEF 14A filed Apr 2, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526138974/d49581ddef14a.htm
- Jeffrey W. Sheets, Board member (per proxy). Source: DEF 14A filed Apr 2, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526138974/d49581ddef14a.htm
- Kimberly S. Lubel, Board member (per proxy). Source: DEF 14A filed Apr 2, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526138974/d49581ddef14a.htm
- Roger A. Cregg, Board member (per proxy). Source: DEF 14A filed Apr 2, 2026, https://www.sec.gov/Archives/edgar/data/1262823/000119312526138974/d49581ddef14a.htm

## Recent 8-K events

- Nov 4, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000076/wlk-20261104.htm
- Sep 29, 2026: Item 2.05, Costs associated with exit or disposal activities (restructuring); Item 7.01, Regulation FD disclosure. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000067/wlk-20260924.htm
- Aug 31, 2026: Item 5.02, Departure or appointment of directors or officers; compensation. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526376996/d437911d8k.htm
- Aug 4, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000026/wlk-20260804.htm
- Jul 29, 2026: Item 8.01, Other events. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526324110/d151580d8k.htm
- Jun 15, 2026: Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526271206/d166027d8k.htm
- May 18, 2026: Item 5.07, Submission of matters to a vote of security holders. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526229093/d918757d8k.htm
- May 5, 2026: Item 2.02, Results of operations and financial condition (earnings release); Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000019/wlk-20260505.htm
- May 1, 2026: Item 7.01, Regulation FD disclosure. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526199067/d145614d8k.htm
- Apr 20, 2026: Item 5.02, Departure or appointment of directors or officers; compensation; Item 7.01, Regulation FD disclosure; Item 9.01, Financial statements and exhibits. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526164225/d28569d8k.htm

## Insider trades (Form 4)

- Aug 11, 2026: Albert Chao (Executive Chairman) sold 38,873 shares, about $3.1M. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526345140/0001193125-26-345140-index.htm
- Mar 27, 2026: Robert F. Buesinger (EVP, PEM Segment Head) sold 4,000 shares, about $461,000. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526133508/0001193125-26-133508-index.htm
- Mar 27, 2026: Mark Steven Bender (EVP & CFO) sold 16,413 shares, about $1.8M. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526131706/0001193125-26-131706-index.htm
- Feb 27, 2026: Mark Steven Bender (EVP & CFO) sold 17,409 shares, about $1.8M. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312526084672/0001193125-26-084672-index.htm
- Dec 22, 2025: Albert Chao (Executive Chairman) sold 40,836 shares, about $3.0M. Source: https://www.sec.gov/Archives/edgar/data/1262823/000119312525329926/0001193125-25-329926-index.htm

## Latest filings

- 8-K filed Sep 29, 2026: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000067/wlk-20260924.htm
- 10-K filed Feb 26, 2026: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000016/wlk-20251231.htm
- 10-Q filed Aug 5, 2026: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000032/wlk-20260630.htm
- DEF 14A filed Apr 2, 2026: https://www.sec.gov/Archives/edgar/data/1262823/000119312526138974/d49581ddef14a.htm

## About this data

SEC EDGAR filings, read by Steadybase. Every value links to the filing it came from.
Steadybase covers US-headquartered public companies that file with the SEC. API and MCP access: https://steadybase.io/docs/