stockrowWhat it does
Westlake Corporation is a global manufacturer of chemicals, building products and infrastructure materials. Founded in 1986, it is headquartered in Houston and led by President and Chief Executive Officer Jean-Marc Gilson.
The company operates through two segments. Housing and Infrastructure Products makes items used in homes, commercial buildings and public works, including siding, roofing, windows, pipe and fittings. It also makes compounds: blends of plastics and additives that customers turn into products for construction, healthcare, automobiles and other uses.
Performance and Essential Materials makes chemicals and plastics used by other manufacturers. Its products include ethylene, polyethylene, chlorine, caustic soda, PVC and epoxy resins. Customers use them in products ranging from packaging and coatings to water-treatment materials and components for wind energy and transportation.
The two businesses are connected. Westlake makes ethylene and chlorine, uses them to make intermediate chemicals and PVC, and then uses some of that PVC in its own building products, pipe, fittings and compounds. It sells materials it does not use internally to other manufacturers and international markets.
Westlake sells through its own sales teams, distributors and manufacturers’ representatives. Its products reach construction professionals and homeowners as well as industrial customers that process its materials into finished goods.
How it makes money
Westlake earns revenue by selling both finished products and materials that customers process further. Its Housing and Infrastructure Products segment sells exterior and interior building products, PVC pipe and fittings, and compounds. Performance and Essential Materials sells plastics, chemicals and resins, including PVC, polyethylene, caustic soda and epoxy.
The company reported sales of $3 billion in the third quarter of 2026. Its Performance and Essential Materials segment recorded a loss from operations of $2,100 million in 2025.
In building products, demand depends on new construction, repair and remodeling, infrastructure projects and the inventory decisions of dealers and distributors. Residential product sales have historically been higher in the second and third quarters, when restocking and weather tend to support construction, and lower in the fourth quarter.
The materials business sells into global markets. Commodity prices reflect the balance of supply and demand, while operating rates, economic activity, plant turnarounds and raw-material prices also influence margins. Westlake manages its integrated vinyls chain to optimize product margins and capacity utilization. Some intermediate materials are consumed within the company; external sales include PVC, polyethylene, caustic soda and epoxy.
The businesses serve ongoing needs such as packaging, construction, water systems and industrial coatings, although Westlake’s sales volumes and prices vary with market conditions. In the third quarter of 2026, lower materials selling prices and lower housing-product volumes contributed to a sequential decline in earnings. Westlake also passes along higher freight costs through fuel surcharges where contracts and market conditions allow.
Customers and how it sells
Westlake’s customers include manufacturers, distributors, contractors and buyers of building products. Its polyethylene customers include producers of film and flexible packaging. PVC is used by downstream fabricators, while caustic soda customers use it to make products including pulp and paper, chemicals and alumina. Epoxy resins serve industries such as construction, automotive, wind energy, aerospace and electronics.
In building products, Westlake sells much of its siding, roofing, windows, pipe and fittings through its own sales force and external manufacturers’ representatives. Distribution centers and warehouses supply local customers, contractors and distributors. Its compounds facilities sell through an internal sales force and distributors. The materials business has sales teams organized by product and region, with distributors serving smaller customers.
No single customer accounted for 10% or more of net sales in either segment in 2025. That disclosure applies separately to each segment.
Westlake manufactures in North America, Europe and Asia, and sells PVC to international markets as well as domestic fabricators. Its building-product manufacturing is primarily in North America, while its compounds facilities also operate in Europe and Asia. Employees were distributed across 18 countries as of December 31, 2025. Residential construction activity in North America is an important driver of the housing-products business.
Suppliers and costs
Westlake supplies much of its own chemical chain. Its ethylene facilities use ethane feedstock, and the company receives ethane through pipelines from several suppliers in Texas and Louisiana. It also purchases additional ethylene from third parties and receives a share of production from its interest in LACC. Westlake buys butene and hexene under multi-year contracts for polyethylene production.
For several larger chlor-alkali plants, salt comes from salt domes the company owns or leases. Other plants purchase salt under long-term contracts. Some electricity and steam are generated on site; Westlake purchases electricity for its remaining facilities under long-term contracts.
Westlake’s North American materials facilities supply most of the PVC needed by its housing-exteriors and pipe-and-fittings plants. Other ingredients, including pigments, fillers and stabilizers, are purchased under contracts or in the spot market. Main feedstock prices generally move with petrochemical benchmarks and energy costs.
Westlake has also faced transportation and distribution cost inflation. In the third quarter of 2026, higher European energy costs and North American diesel and freight costs contributed to increased input costs. Environmental compliance requires capital spending and adds to operating costs.
- Revenue$11.2B
- Cost of revenue−$10.4B
- Selling, general and administrative−$900.0M
- Other operating costs−$1.5B
- Operating income−$1.6B
Competitive position
Westlake competes with different producers across its markets. In housing and infrastructure products, competitors include CertainTeed Corporation, Cornerstone Building Brands, JM Eagle and James Hardie. Competition involves price, product quality and innovation, service, availability and delivery. Alternative materials also compete with Westlake’s products.
In ethylene and polyethylene, named competitors include Dow, ExxonMobil Chemical Company, LyondellBasell and Sasol. Westlake also competes with Olin and other producers in chlor-alkali and PVC, while Olin is among its competitors in the epoxy value chain. Materials competition is primarily based on price, with availability, quality, performance and service also relevant.
Westlake connects ethane and chlor-alkali production to PVC and then to building products. It owns or has interests in pipelines and production assets, and it uses trademarks, patents and proprietary know-how alongside its sales and distribution network.
Our reading: Integration is a meaningful source of competitive strength because Westlake can use its own materials across production stages, although purchased inputs and energy costs still affect it. Our reading: Brands, product development and distribution can support differentiation in building products, but the many named competitors and substitute materials limit that protection. Our reading: Technology offers more limited protection across commodity chemicals, where production technologies are widely available and competition is primarily on price.
| Competitor | Where they compete | Threat (our reading) |
|---|---|---|
| CertainTeed Corporation | Housing and infrastructure products | Medium |
| Cornerstone Building Brands, Inc. | Housing and infrastructure products | Medium |
| JM Eagle Inc. | Housing and infrastructure products | Medium |
| James Hardie | Housing and infrastructure products | Medium |
| Dow Inc. | Ethylene and polyethylene | High |
| LyondellBasell Industries, N.V. | Ethylene and polyethylene | High |
| Sasol Limited | Ethylene and polyethylene | High |
| Olin Corporation | Chlor-alkali, PVC and epoxy value chain | High |
Growth opportunities
Westlake pursues growth through internal investments and acquisitions that complement its products and integrated structure. Its building-products business serves new construction, repair and remodeling, and infrastructure projects. The company also develops products and applications at facilities in the United States, Germany and China.
In January 2026, Westlake acquired ACI, a specialty compounds manufacturer serving primarily the wire and cable sectors. ACI has manufacturing locations in Portugal, Mexico, Tunisia and Romania. Early in the fourth quarter of 2026, Westlake also acquired a steel roofing company, which it expects to broaden its offerings.
A new molecularly oriented PVC pipe plant in Wichita Falls began operating shortly before the November 2026 call. Westlake expects its first commercial sales volume in 2027. The company’s pipe products serve applications including water, sewer, irrigation and electrical infrastructure.
Westlake acquired a PVC and vinyl chloride monomer plant in Wilhelmshaven, Germany, in June 2026. It has announced the closure of its Cologne PVC resin facility and is consolidating its European commodity PVC operations and volume at the acquired site. Westlake expects that site’s access to North American feedstocks and the consolidation to support its European PVC business.
The company is also pursuing cost reductions and plant reliability improvements as part of its profitability plan. Westlake expects residential construction activity to remain challenging into 2027, with infrastructure demand providing some offset to housing-product volumes.
- $11.8BFY2021
- $15.8BFY2022
- $12.5BFY2023
- $12.1BFY2024
- $11.2BFY2025
Structural risks
- Chemical cycles: Petrochemical cyclicality has reduced margins or produced operating losses and could do so again. Westlake has experienced lower prices, increased supply and weaker demand for many materials products, and identifies overcapacity and volatile energy costs as continuing pressures.
- Housing demand: Sales depend on construction, repair and remodeling, as well as distributor and dealer inventory decisions. Westlake expects higher borrowing costs and homebuyer affordability concerns to weigh on near-term housing and infrastructure product volumes.
- Feedstock and energy: Prices for main feedstocks fluctuate with petrochemical benchmarks and energy costs. Westlake expects European PVC profitability to remain under pressure from weak demand, imports and high regional feedstock and energy costs.
- Environmental and operating obligations: Manufacturing locations are subject to environmental, health and safety requirements. Compliance requires spending and increases operating costs; plant closures also carry retirement, severance and other costs.
- Debt and control: Debt service uses cash that cannot be spent elsewhere and may constrain financing. Westlake’s principal stockholder and affiliates will control shareholder votes while they own a majority of its common stock.
Leadership
Westlake’s principal stockholder and its affiliates will control shareholder voting while they own a majority of the company’s common stock. Other stockholders will be unable to affect the outcome of votes during that time.
| Name | Role | Since | Total pay, FY2025 |
|---|---|---|---|
| Albert Chao | — | $6.7 million | |
| James Chao | — | $5.6 million | |
| Jean-Marc Gilson | — | $6.4 million | |
| M. Steven Bender | — | $3.9 million | |
| Robert F. Buesinger | — | $4.5 million |
Bottom line
Our reading
Our reading: Westlake combines a cyclical chemicals manufacturer with a building-products and infrastructure business, using its integrated materials chain to supply both outside customers and its own plants (item1; item7). Its exposure rests on chemical prices and feedstock costs as well as construction demand, while recent plant closures and investment in pipe and European PVC show how it is reshaping its operations (item7; call_prepared).