• 154% increase in first quarter 2021 operating income of $346 million vs first quarter 2020

Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months ended March 31, 2021 of $242 million, or $1.87 per diluted share, on net sales of $2,357 million. Net income in the first quarter of 2021 increased by $97 million from first quarter 2020 net income of $145 million, or $1.13 per share, on net sales of $1,932 million. Income from operations of $346 million for the first quarter of 2021 increased by $210 million from income from operations of $136 million for the first quarter of 2020. The increases in net income and income from operations were primarily driven by higher sales prices and integrated margins for most of our major products including polyethylene and PVC, as well as higher earnings resulting from strong demand in our downstream building products business. These increases in demand were driven by rebounding global economic activity in packaging consumption combined with the strength in the North American residential construction and the repair and remodeling markets. These increases were partially offset by lost sales and production volumes, increased maintenance expense and higher ethane and ethylene feedstock and natural gas fuel costs related to the severe winter storm. Compared to the prior-year period, net income was also impacted by higher income tax expense as the first quarter of 2020 included a tax benefit from the CARES Act of $62 million, or $0.48 per share.

First quarter 2021 net income of $242 million, or $1.87 per share, increased by $129 million from fourth quarter 2020 net income of $113 million, or $0.87 per share. Income from operations of $346 million for the first quarter of 2021 increased by $168 million from income from operations of $178 million for the fourth quarter of 2020. The increases in net income and income from operations versus the prior quarter were primarily due to continuing strength in demand for packaging products and construction activity which drove higher prices, integrated margins and volumes for most of our major products including polyethylene and PVC, in addition to strong earnings in our downstream building products business. These increases were partially offset by lower caustic soda prices as well as higher feedstock and fuel costs.

"Westlake had a strong start to 2021 as we experienced solid financial performance as we benefitted from the continuing global economic recovery and robust product demand paired with higher prices and margins for many of our products. The severe winter storm caused widespread industry disruption, including Westlake. Through the efforts of our employees, we quickly responded to the disruptions caused by the storm and fully resumed operations by the end of the quarter. We have worked tirelessly to address strong customer demand during the quarter," said Albert Chao, President and Chief Executive Officer. "As we look further into the year, we see continuing strong global demand in our PVC, polyethylene and downstream building products business driven by solid markets for the downstream uses of our products including residential construction, packaging and healthcare. We will remain focused on our strategy of safely and efficiently operating our facilities, while making disciplined investments, launching new and sustainable products, furthering our chain integration, lowering our costs and leveraging our current products and footprint around the world, while being a good steward of the environment in the communities in which we operate."

Net cash provided by operating activities was $265 million for the first quarter of 2021. As of March 31, 2021, cash and cash equivalents were $1,393 million and long-term debt was $3,547 million. Capital expenditures were $141 million for the first quarter of 2021.

EBITDA (earnings before interest expense, income taxes, depreciation and amortization) of $553 million for first quarter 2021 increased by $216 million compared to first quarter 2020 EBITDA of $337 million. First quarter 2021 EBITDA increased by $167 million compared to fourth quarter 2020 EBITDA of $386 million. A reconciliation of EBITDA to net income, income from operations, and net cash provided by operating activities can be found in the financial schedules at the end of this press release.

VINYLS SEGMENT

First quarter 2021 income from operations for the Vinyls segment of $200 million increased by $127 million from first quarter 2020 income from operations of $73 million. This increase in income from operations versus the prior-year period was primarily due to higher sales prices and integrated margins for PVC resin and higher earnings in our downstream building products business. The increase in operating income was partially offset by lower sales volumes and production and increased maintenance expense resulting from the severe winter storm, higher feedstock and fuel costs, as well as lower sales prices for caustic soda.

Vinyls income from operations for the first quarter of 2021 of $200 million increased by $34 million from fourth quarter 2020 income from operations of $166 million primarily due to strong sales prices for PVC resin, higher sales volumes for most of our major products and higher earnings in our downstream building products business, partially offset by higher feedstock and fuel costs as well as lower sales prices for caustic soda.

OLEFINS SEGMENT

First quarter 2021 income from operations for the Olefins segment of $180 million increased by $118 million from first quarter 2020 income from operations of $62 million. This increase in income from operations versus the prior-year period was primarily due to higher sales prices and integrated margins for all of our products, driven by continuing strong global demand, partially offset by lower sales volumes and lost production and increased maintenance expense resulting from the impact of the severe winter storm, as well as higher feedstock costs and fuel costs.

Olefins income from operations of $180 million in the first quarter of 2021 increased by $158 million from fourth quarter 2020 income from operations of $22 million. This increase in income from operations versus the prior quarter was primarily due to higher sales prices and integrated margins, driven by continuing strong global demand, as well as increased sales volumes for our products resulting from the hurricane impacts in late 2020, partially offset by higher feedstock and fuel costs.

The statements in this release and the related teleconference relating to matters that are not historical facts, including statements regarding continued improvement of our performance in 2021, demand for polyethylene, PVC and downstream business products, results of investments in initiatives and our focus on our strategy of safely and efficiently operating our facilities, while making disciplined investments, launching new and sustainable products, furthering our chain integration, lowering our costs and leveraging our current products and footprint around the world, and being a good steward of the environment in the communities in which we operate, are forward-looking statements. These forward-looking statements are subject to significant risks and uncertainties. Actual results could differ materially, based on factors including, but not limited to: the COVID-19 pandemic and the response thereto; general economic and business conditions; the cyclical nature of the chemical industry; availability, cost and volatility of raw materials and utilities, including natural gas and natural gas liquids from shale production; the price of crude oil; uncertainties associated with the United States and worldwide economies, including those due to global economic and financial conditions; governmental regulatory actions, including environmental regulation and changes in trade policies; political unrest; industry production capacity and operating rates; the supply/demand balance for Westlake's products; competitive products and pricing pressures; access to capital markets; technological developments; the effect and results of litigation and settlements of litigation; operating interruptions; and other risk factors. For more detailed information about the factors that could cause actual results to differ materially, please refer to Westlake's Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the SEC in February 2021.

Use of Non-GAAP Financial Measures

This release makes reference to certain "non-GAAP" financial measures, such as EBITDA, as defined in Regulation G of the U.S. Securities Exchange Act of 1934, as amended. For this purpose, a non-GAAP financial measure is generally defined by the Securities and Exchange Commission ("SEC") as a numerical measure of a registrant's historical or future financial performance, financial position or cash flows that (1) excludes amounts, or is subject to adjustments that have the effect of excluding amounts, that are included in the most directly comparable measure calculated and presented in accordance with GAAP in the statement of income, balance sheet or statement of cash flows (or equivalent statements) of the registrant; or (2) includes amounts, or is subject to adjustments that have the effect of including amounts, that are excluded from the most directly comparable measure so calculated and presented. We report our financial results in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"), but believe that certain non-GAAP financial measures, such as EBITDA, provide useful supplemental information to investors regarding the underlying business trends and performance of the Company's ongoing operations and are useful for period-over-period comparisons of such operations. These non-GAAP financial measures should be considered as a supplement to, and not as a substitute for, or superior to, the financial measures prepared in accordance with U.S. GAAP. A reconciliation of EBITDA to net income, income from operations and net cash provided by operating activities can be found in the financial schedules at the end of this press release.

About Westlake:

Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, we provide the building blocks for vital solutions — from packaging and healthcare products to automotive and consumer goods, to building and construction products. For more information, visit the company's web site at www.westlake.com.

Westlake Chemical Corporation Conference Call Information:

A conference call to discuss Westlake Chemical Corporation's first quarter 2021 results will be held Tuesday, May 4, 2021 at 11:00 AM Eastern Time (10:00 AM Central Time). To access the conference call, dial (855) 760-8160 or (704) 288-0624 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 467 76 49.

A replay of the conference call will be available beginning two hours after its conclusion until 11:59 p.m. Eastern Time on May 11, 2021. To hear a replay, dial (855) 859-2056 or (404) 537-3406 for international callers. The replay passcode is 467 76 49.

The conference call will also be available via webcast at https://edge.media-server.com/mmc/p/fmi27wgt and the earnings release can be obtained via the Company's web page at: http://www.westlake.com/investor-relations.

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