Westlake Corporation (WLK) Stock Analysis

Westlake Corporation's two principal operating segments — Housing and Infrastructure Products (HIP) and Performance and Essential Materials (PEM) — together maintained approximately 39.2 billion pounds per year of aggregate production capacity across manufacturing sites in North America, Europe, and Asia as of February 2026. PEM encompasses chlor-alkali (6.7 billion lbs/year chlorine capacity), VCM (7.6 billion lbs/year), commodity PVC (5.5 billion lbs/year), polyethylene, and epoxy resins; HIP covers PVC siding, pipe, windows, stone veneer, and compounds across 53 North American manufacturing facilities. Westlake began operations in 1986.

Westlake sells commodity chemicals and differentiated building products. PEM products are priced on spot and contract terms in highly competitive global markets, where margins track crude oil and ethylene feedstock cycles. Ethylene is supplied partly through OpCo (a consolidated partnership) on a cost-plus basis generating a fixed margin of $0.10 per pound, and partly through third-party purchases and the LACC joint venture (50% ownership) in Lake Charles, Louisiana. Westlake competes in HIP against CertainTeed Corporation, Cornerstone Building Brands, and James Hardie, distributing through 39 leased and 8 owned North American distribution centers. HIP demand is tied to residential construction; the 10-K notes housing activity declined through 2025 due to high mortgage rates, elevated construction costs, and tariff impacts on imported lumber. No single customer accounted for 10% or more of HIP net sales in 2025.