Westlake Corp

Cash, Investments and Debt Net cash provided by operating activities was $135 million for the second quarter of 2025 and capital expenditures were $267 million.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

As of June 30, 2025, cash, cash equivalents and fixed-income investments were $2.3 billion and total debt was $4.7 billion.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

The amendments address five specific areas: (1) similar risk assessment for cash flow hedges, (2) hedging interest payments on choose-your-rate debt, (3) cash flow hedges of nonfinancial forecasted transactions, (4) net written options as hedging instruments, and (5) foreign currency-denominated debt designated as both a hedging instrument and hedged item.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

Available-for-Sale Securities Investments in securities at June 30, 2026 and December 31, 2025 consisted of available-for-sale debt securities.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

federal agency securities 11 11 Level 2 Asset-backed securities 39 39 Level 2 Supranational securities 5 5 Level 2 Available-for-sale debt securities $ 210 $ 209 Contractual maturities of debt securities Within one year $ 66 $ 66 One to five years 133 132 Six to ten years 2 2 After ten years 9 9 Available-for-sale debt securities $ 210 $ 209 December 31, 2025 Cost Fair Value Fair Value Level Debt securities Corporate bonds $ 108 $ 109 Level 2 U.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

federal agency securities 13 13 Level 2 Asset-backed securities 37 37 Level 2 Supranational securities 8 8 Level 2 Available-for-sale debt securities $ 203 $ 204 Contractual maturities of debt securities Within one year $ 63 $ 63 One to five years 128 129 Six to ten years 2 2 After ten years 10 10 Available-for-sale debt securities $ 203 $ 204 The fair value of the available-for-sale debt securities are determined based on observable market-based inputs, such as quotes from financial reporting services.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

housing starts and repair and remodel spending, reflecting the important role that our products play in delivering value to our customers and our strategy to 'win with the winners' by being a supplier of choice for the faster-growing end customers in the market, said Jean-Marc Gilson, President and Chief Executive Officer.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

In addition, the impact of evolving claims and programs, such as natural resource damage claims, industrial site reuse initiatives and state remediation programs creates further uncertainty of the ultimate resolution of these matters.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

EXECUTIVE COMMENTARY Our overall financial performance in the second quarter of 2025 reflected several headwinds, many of which we believe are transitory in nature.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

PEM sales volume was impacted by continued soft global industrial and manufacturing activity that was exacerbated by temporary disruptions to export sales volumes created by tariff uncertainty.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

This increase in loss from operations versus the prior quarter was primarily driven by a 6% decline in sales volume due to weaker global demand, in part due to temporary disruptions in global trade flows created by tariff uncertainty, as well as lower production levels, particularly for chlorine, caustic soda, and PVC resin, due to planned turnarounds and unplanned plant outages.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

These forward-looking statements are subject to significant risks and uncertainties.

SEC original ↗Westlake Corp — Earnings release (8-K exhibit)EX-99Aug 5, 2025

OTHER INFORMATION 1) Legal Proceedings 44 1A) Risk Factors 44 2) Unregistered Sales of Equity Securities and Use of Proceeds 45 5) Other Information 45 6) Exhibits 46 Table of Contents PART I.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026

Commitments and Contingencies The Company is involved in a number of legal and regulatory matters that are incidental to the normal conduct of its business, including lawsuits, investigations and claims.

SEC original ↗Westlake Corp — 10-Q Quarterly report10-QAug 5, 2026