4Q 2022 Earnings Presentation Westlake Fourth Quarter 2022 Highlights ▪ Compared to the prior-year period, fourth quarter financial results were impacted by lower sales volume1 and selling prices due to customer destocking, China lockdowns, lackluster European demand and rising interest rates: ▪ Net sales of $3.3 billion, a decrease of 6% vs. fourth quarter 2021 net sales ▪ Net income of $232 million, a decrease of 64% vs. fourth quarter 2021 net income ▪ EBITDA of $619 million, a decrease of 45% vs. fourth ...