Westlake Corp.
- WLK ยท NYSE
- Industrial Organic Chemicals
- Houston, TX
- 14,600 employees
- CIK 0001262823
Updated from SEC filings through
Top things to know
Executives
- Jean-Marc Gilson President and Chief Executive Officer 10-K, 2026-02-26
- Jonathan Baksht SVP and CFO 4, 2026-06-16
- Mark Steven Bender EVP & CFO 4, 2026-05-14
- M. Steven Bender Executive Vice President and Chief Financial Officer 10-K, 2026-02-26
- Tommy E. Darby Vice President, Chief Accounting Officer 8-K, 2026-08-31
- Jeffrey A. Holy Vice President, Finance and Investor Relations 8-K, 2026-08-31
Westlake Corp is a U.S. public company in industrial organic chemicals (SIC 2860), headquartered in Houston, TX. It trades as WLK on NYSE. Revenue was $11.2B in the fiscal year ending December 31, 2025, -8.0% from the year before. It reported about 14,600 employees. Jean-Marc Gilson is President and Chief Executive Officer.
Five-year financials
| Metric | FY2025 | FY2024 | FY2023 | FY2022 | FY2021 |
|---|---|---|---|---|---|
| Revenue | $11.2B 10-K, 2026-02-26 | $12.1B 10-K, 2026-02-26 | $12.5B 10-K, 2026-02-26 | $15.8B 10-K, 2025-02-25 | $11.8B 10-K, 2024-02-22 |
| Operating income | -$1.6B 10-K, 2026-02-26 | $875M 10-K, 2026-02-26 | $729M 10-K, 2026-02-26 | $3.0B 10-K, 2025-02-25 | $2.8B 10-K, 2024-02-22 |
| SG&A | $900M 10-K, 2026-02-26 | $874M 10-K, 2026-02-26 | $865M 10-K, 2026-02-26 | $835M 10-K, 2025-02-25 | $551M 10-K, 2024-02-22 |
| Net income | -$1.5B 10-K, 2026-02-26 | $602M 10-K, 2026-02-26 | $479M 10-K, 2026-02-26 | $2.2B 10-K, 2025-02-25 | $2.0B 10-K, 2024-02-22 |
Annual figures from XBRL in each company's own filings. Click a figure to open the filing. SG&A marked derived is general and administrative plus selling and marketing.
Leadership and board
| Name | Title | Source |
|---|---|---|
| Jean-Marc Gilson President and CEO Westlake Corporation | President and Chief Executive Officer | 10-K, 2026-02-26 |
| Jonathan Baksht | SVP and CFO | 4, 2026-06-16 |
| Mark Steven Bender | EVP & CFO | 4, 2026-05-14 |
| M. Steven Bender | Executive Vice President and Chief Financial Officer | 10-K, 2026-02-26 |
| Tommy E. Darby Chief Accounting Officer at Westlake | Vice President, Chief Accounting Officer | 8-K, 2026-08-31 |
| Jeffrey A. Holy | Vice President, Finance and Investor Relations | 8-K, 2026-08-31 |
| L. Benjamin Ederington Executive Vice President, Legal and External Affairs | Executive Vice President, Legal and External Affairs | 10-K, 2026-02-26 |
| Scott T. Szwejbka SVP Housing and Infrastructure Products Segment Head - Westlake | Senior Vice President, Housing & Infrastructure Products Segment Head | 10-K, 2026-02-26 |
| Tommy Darby | VP and CAO | 4, 2026-09-01 |
| Albert Chao | Executive Chairman | 4, 2026-08-11 |
| Brian John Powers | SVP, PEM Segment Head | 4, 2026-04-06 |
| Robert F. Buesinger | EVP, PEM Segment Head | 4, 2026-03-31 |
| James Chao | Senior Chairman | 4, 2026-02-23 |
| Jeffrey Adam Holy | VP and CAO | 4, 2026-02-23 |
| Scott Thomas Szwejbka | SVP, HIP Segment Head | 4, 2026-02-23 |
| Catherine T. Chao | Board member (per proxy) bio: director | DEF 14A, 2026-04-02 |
What Westlake Corp does
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.
Item 1. Business, 10-K for the year ending December 31, 2025
Shares and governance
| Shares outstanding | 127.9 million (as of October 28, 2026) | 10-Q, November 4, 2026 |
|---|---|---|
| Public float | $2.5B (as of June 30, 2025) | 10-K, February 26, 2026 |
| Reportable segments | 2 (period ending September 30, 2026) | 10-Q, November 4, 2026 |
| Latest proxy statement | Meeting May 14, 2026 (filed April 2, 2026) | DEF 14A, April 2, 2026 |
| Auditor | PricewaterhouseCoopers LLP (Houston, Texas) | Latest 10-K |
Insider trades
Open-market buys and sales by officers and directors, from Forms 4 and 5. One row per filing.
| Date | Insider | Trade | Shares | Value | Source |
|---|---|---|---|---|---|
| August 11, 2026 | Albert Chao Executive Chairman | Sale | 38,873 | $3.1M | Form 4, August 11, 2026 |
| March 27, 2026 | Robert F. Buesinger EVP, PEM Segment Head | Sale | 4,000 | $461K | Form 4, March 31, 2026 |
| March 27, 2026 | Mark Steven Bender EVP & CFO | Sale | 16,413 | $1.8M | Form 4, March 30, 2026 |
| February 27, 2026 | Mark Steven Bender EVP & CFO | Sale | 17,409 | $1.8M | Form 4, March 2, 2026 |
| December 22, 2025 | Albert Chao Executive Chairman | Sale | 40,836 | $3.0M | Form 4, December 23, 2025 |
Recent 8-K events
- 8-K filed 2026-11-04
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-09-29
- Item 2.05 Costs associated with exit or disposal activities (restructuring)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-08-31
- Item 5.02 Departure or appointment of directors or officers; compensation
- 8-K filed 2026-08-04
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-07-29
- Item 8.01 Other events
- 8-K filed 2026-06-15
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-05-18
- Item 5.07 Submission of matters to a vote of security holders
- 8-K filed 2026-05-05
- Item 2.02 Results of operations and financial condition (earnings release)
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-05-01
- Item 7.01 Regulation FD disclosure
- 8-K filed 2026-04-20
- Item 5.02 Departure or appointment of directors or officers; compensation
- Item 7.01 Regulation FD disclosure
Frequently asked questions about Westlake Corp
- What does Westlake Corp do?
- In its own words, from Item 1 of its 10-K: "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."
- What is Westlake Corp's revenue?
- $11.2B for the fiscal year ending December 31, 2025, from its 10-K filed February 26, 2026.
- Is Westlake Corp profitable?
- Westlake Corp reported net income of -$1.5B for the fiscal year ending December 31, 2025.
- How many employees does Westlake Corp have?
- About 14,600 as of December 31, 2025, as stated in its annual report.
- Who is the CEO of Westlake Corp?
- Jean-Marc Gilson, President and Chief Executive Officer, as named in a 10-K filed February 26, 2026.
- Who is the CFO of Westlake Corp?
- Jonathan Baksht, SVP and CFO, as named in a 4 filed June 16, 2026.
- Where is Westlake Corp headquartered?
- Houston, TX.
- What is Westlake Corp's stock ticker?
- WLK on NYSE.
- What industry is Westlake Corp in?
- Industrial Organic Chemicals, SIC code 2860.
- What is Westlake Corp's website?
- westlake.com. Investor relations: https://westlake.com/#.
- When does Westlake Corp report earnings next?
- February 4, 2027. Source: estimate_8k_pattern.
- Is Westlake Corp a public company?
- Yes. Westlake Corp files with the SEC under CIK 0001262823 and trades as WLK.
- Who audits Westlake Corp?
- PricewaterhouseCoopers LLP, Houston, Texas, as named in its latest annual report (10-K).
- How many shares of Westlake Corp are outstanding?
- 127.9 million shares as of October 28, 2026, from its 10-Q filed November 4, 2026.
- What is Westlake Corp's public float?
- $2.5B as of June 30, 2025, as reported on the cover of its 10-K filed February 26, 2026.
- How many business segments does Westlake Corp report?
- 2 reportable segments for the period ending September 30, 2026, from its 10-Q filed November 4, 2026.
- When is Westlake Corp's annual shareholder meeting?
- May 14, 2026, per its proxy statement (DEF 14A) filed April 2, 2026.
- Have Westlake Corp insiders traded stock recently?
- Since December 22, 2025, officers and directors reported 5 open-market sales worth about $10.2M and 0 purchases on Forms 4 and 5. The most recent: Albert Chao (Executive Chairman) sold 38,873 shares on August 11, 2026.