8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (date of earliest event reported): February 19, 2019

Westlake Chemical Corporation

(Exact name of registrant as specified in its charter)

Delaware	001-32260	76-0346924
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas	77056
(Address of principal executive offices)	(Zip Code)

Registrant's telephone number, including area code: (713) 960-9111

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

Item 2.02. Results of Operations and Financial Condition.

On February 19, 2019, Westlake Chemical Corporation (the "Company") issued a press release announcing its 2018fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1.

The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Chemical Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein.

Item 7.01. Regulation FD Disclosure.

The Company is holding a conference call on February 19, 2019 to discuss its 2018fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2018 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

The following exhibits are furnished herewith:

99.1    Press release issued on February 19, 2019.

99.2    Investor Presentation

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			WESTLAKE CHEMICAL CORPORATION
Date:	February 19, 2019	By:	/S/ ALBERT CHAO
			Albert Chao President and Chief Executive Officer

EX-99.1

EXHIBIT 99.1

WESTLAKE CHEMICAL CORPORATION

Contact—(713) 960-9111

Investors—Steve Bender

Media— L. Benjamin Ederington

Westlake Chemical Corporation Reports Record 2018 Full-Year Results

•Record annual sales of $8.6 billion

•Record annual income from operations of $1.4 billion

•Net income for 2018 of $996 million, or $7.62 per diluted share, and record EBITDA of $2.1 billion

•Retired $1.2 billion of debt in 2018

HOUSTON--(BUSINESS WIRE)-- Westlake Chemical Corporation (NYSE: WLK) (the "Company" or "Westlake") today reported net income attributable to Westlake for the three months ended December 31, 2018 of $123 million, or $0.95 per diluted share, on net sales of $1,995 million. Net income decreased by $679 million, or $5.20 per diluted share, compared to fourth quarter 2017 net income of $802 million, or $6.15 per diluted share, which included a one-time, non-cash tax benefit of $591 million, or $4.53 per diluted share, resulting from the reduced U.S. corporate income tax rate under the U.S. Tax Cuts and Jobs Act enacted in December 2017. Income from operations of $207 million for the fourth quarter of 2018 decreased by $156 million compared to $363 million for the fourth quarter of 2017. Compared to the prior-year period, income from operations for the fourth quarter of 2018 was negatively impacted by (1) higher ethane feedstock costs; (2) lower sales prices for polyethylene and polyvinyl chloride (“PVC resin”); and (3) higher fuel costs driven by the increase in natural gas prices. Partially offsetting these decreases were higher polyethylene sales volumes and higher caustic soda sales prices and volumes. Transaction and integration-related costs in the fourth quarter of 2018 were $13 million, or $0.07 per diluted share.

Fourth quarter 2018 net income of $123 million, or $0.95 per diluted share, on net sales of $1,995 million, decreased $185 million from third quarter 2018 net income of $308 million, or $2.35 per diluted share, on sales of $2,255 million. The decrease in net income from the previous quarter was primarily due to (1) lower sales prices for all of our major products as the decline in oil prices and uncertainties in international trade impacted both domestic and export prices; (2) seasonally lower sales volumes of our downstream vinyls products; (3) higher feedstock costs resulting from a large increase in ethane costs at the end of the third quarter; (4) higher fuel costs resulting from increases in natural gas prices driven by winter weather; (5) a higher effective tax rate; and (6) lower other income as a result of a one-time gain associated with the settlement of certain pension liabilities in the third quarter of 2018. Income from operations of $207 million for the fourth quarter of 2018 decreased by $189 million from third quarter 2018 income from operations of $396 million. This decrease was primarily due to lower integrated margins resulting from lower sales prices and higher feedstock and energy costs for our major products and lower sales volumes for all of our major products.

For the year ended December 31, 2018, net income attributable to Westlake was $996 million, or $7.62 per diluted share, on net sales of $8,635 million. This decrease in net income of $308 million, or $2.38 per diluted share, compared to 2017 net income attributable to Westlake of $1,304 million, or $10.00 per diluted share, on net sales of $8,041 million. 2018 net income decreased versus the prior year primarily due to the $591 million income tax benefit in 2017 resulting from the Tax Act and higher ethane feedstock costs. These decreases were partially offset by (1) higher sales prices and volumes for caustic soda; (2) a lower effective income tax rate resulting from the reduced U.S. corporate income tax rate under the Tax Act; (3) lower purchased ethylene costs; (4) higher other income, including a one-time pension settlement gain of $14 million and higher interest income; and (5) a lower interest expense due to lower average debt outstanding for 2018, as compared to 2017. Net sales for the year ended December 31, 2018 increased by $594 million to $8,635 million compared to net sales for the year ended December 31, 2017 of $8,041 million, mainly due to higher sales prices and volumes for caustic soda and higher sales volumes for PVC resin and polyethylene, partially offset by lower polyethylene sales prices and lower styrene sales volumes. Income from operations was $1,408 million for the year ended December 31, 2018 as compared to $1,225 million for the year ended December 31, 2017, an increase of $183 million. The increase in income from operations was mainly a result of higher

i

sales prices and volumes for caustic soda and improved operating rates in the Vinyls segment due to fewer planned turnarounds and unplanned outages, partially offset by higher ethane feedstock costs, as compared to the prior year. Pre-tax transaction and integration-related costs for the year ended December 31, 2018 were $33 million, or $0.19 per diluted share after tax, as compared to $29 million in 2017.

"We are very pleased with our 2018 results with records for both income from operations and EBITDA. We saw solid demand for all of our major products in both the domestic and export markets while benefitting from the investments we made since our acquisition of Axiall to improve our operations and reliability," said Albert Chao, President and Chief Executive Officer. "We are excited about the recent acquisition of NAKAN^TM, a global leader in PVC compounding which has an outstanding reputation for superior technology, product quality and operational excellence. We welcome their team into the Westlake family and look forward to leveraging their capabilities with our current operations to serve our customers and drive value for our shareholders."

Net cash provided by operating activities was $254 million for the fourth quarter of 2018 and $1,409 million for 2018. Capital expenditures for the fourth quarter and full year of 2018 were $195 million and $702 million, respectively. As of December 31, 2018, cash and cash equivalents were $753 million and long-term debt was $2,668 million.

EBITDA (earnings before interest expense, income taxes, depreciation and amortization) of $374 million for the fourth quarter of 2018 decreased $143 million compared to fourth quarter 2017 EBITDA of $517 million. Fourth quarter 2018 EBITDA decreased $206 million compared to third quarter 2018 EBITDA of $580 million. For full year 2018, record EBITDA of $2,101 million was $260 million higher than 2017 EBITDA of $1,841 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.

OLEFINS SEGMENT

Fourth quarter 2018 income from operations for the Olefins segment of $90 million decreased $76 million from fourth quarter 2017 income from operations of $166 million. This decrease was primarily due to lower integrated margins resulting from lower polyethylene sales prices driven by lower oil prices and higher ethane feedstock and energy costs, partially offset by higher polyethylene sales volumes as compared to the prior-year period.

Olefins income from operations of $90 million for the fourth quarter of 2018 decreased $72 million from third quarter 2018 income from operations of $162 million. The decrease was primarily due to lower sales volumes for our major products and lower integrated margins for polyethylene resulting from lower sales prices and higher feedstock and energy costs, as higher ethane pricing at the end of the third quarter negatively impacted our fourth quarter earnings.

Olefins income from operations of $573 million for 2018 decreased $82 million from income from operations of $655 million for 2017. The decrease in income from operations compared to the prior year was primarily due to lower margins resulting from higher ethane feedstock costs and lower polyethylene sales prices, partially offset by higher polyethylene sales volumes.

VINYLS SEGMENT

Fourth quarter 2018 income from operations for the Vinyls segment of $125 million decreased by $89 million from fourth quarter 2017 income from operations of $214 million. This decrease was mainly attributable to lower PVC resin margins resulting from lower sales prices and higher feedstock and power costs.

Vinyls income from operations for the fourth quarter of 2018 of $125 million decreased by $126 million from third quarter 2018 income from operations of $251 million. The decrease was primarily due to lower sales prices for caustic soda and PVC resin, higher ethane feedstock, higher purchased ethylene, and higher fuel costs, and seasonally lower sales volumes for all of our major products.

Vinyls income from operations of $913 million for 2018 increased $274 million from income from operations of $639 million for 2017. This increase was mainly attributable to higher sales prices and volumes for caustic soda, lower purchased ethylene costs, improved operating rates and lower costs associated with planned turnarounds and unplanned outages, as compared to 2017.

ii

The statements in this release and the related teleconference relating to matters that are not historical facts, including statements regarding the benefits of NAKAN and the ability to drive value for shareholders 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: 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, 2017, which was filed with the SEC in February 2018.

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. 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.

Westlake Chemical Corporation

Westlake Chemical Corporation is an international manufacturer and supplier of petrochemicals, polymers and building products with headquarters in Houston. The Company's range of products includes: ethylene, polyethylene, styrene, propylene, chlor-alkali and derivative products, PVC suspension and specialty resins, PVC compounds, and PVC building products including siding, pipe, fittings and specialty components, windows, fence, deck and film. 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 fourth quarter and full year 2018 results will be held Tuesday, February 19, 2019 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 7077616.

A replay of the conference call will be available beginning two hours after its conclusion until 11:59 p.m. Eastern Time on February 26, 2019. To hear a replay, dial (855) 859-2056 or (404) 537-3406 for international callers. The replay passcode is 7077616.

The conference call will also be available via webcast at:https://edge.media-server.com/m6/p/4a9jy39r and the earnings release can be obtained via the company's web page at: http://www.westlake.com/investor-relations.

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WESTLAKE CHEMICAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three Months Ended December 31,						Twelve Months Ended December 31,
	2018			2017			2018			2017
	(In millions of dollars, except per share data)
Net sales	$	1,995		$	2,010		$	8,635		$	8,041
Cost of sales	1,641			1,514			6,648			6,280
Gross profit	354			496			1,987			1,761
Selling, general and administrative expenses	108			101			445			399
Amortization of intangibles	26			26			101			108
Transaction and integration-related costs	13			6			33			29
Income from operations	207			363			1,408			1,225
Interest expense	(30		)	(40		)	(126		)	(159		)
Other income (loss), net	(1		)	2			52			15
Income before income taxes	176			325			1,334			1,081
Provision for (benefit from) income taxes (1)	45			(491		)	300			(258		)
Net income	131			816			1,034			1,339
Net income attributable to noncontrolling interests	8			14			38			35
Net income attributable to Westlake Chemical Corporation	$	123		$	802		$	996		$	1,304
Earnings per common share attributable to Westlake Chemical Corporation:
Basic	$	0.95		$	6.18		$	7.66		$	10.05
Diluted	$	0.95		$	6.15		$	7.62		$	10.00

________________

(1) The fourth quarter 2017 tax provision includes a one-time, non-cash tax benefit of approximately $591 million, or $4.53 per diluted share, as a result of the Tax Act, enacted on December 22, 2017.

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WESTLAKE CHEMICAL CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

	December 31, 2018		December 31, 2017
	(In millions of dollars)
ASSETS
Current assets
Cash and cash equivalents	$	753	$	1,531
Accounts receivable, net	1,037		1,001
Inventories	1,014		900
Prepaid expenses and other current assets	38		31
Total current assets	2,842		3,463
Property, plant and equipment, net	6,595		6,412
Other assets, net	2,165		2,201
Total assets	$	11,602	$	12,076
LIABILITIES AND EQUITY
Current liabilities (accounts payable and accrued liabilities)	$	1,183	$	1,257
Current portion of long-term debt	—		710
Long-term debt, net	2,668		3,127
Other liabilities	1,675		1,613
Total liabilities	5,526		6,707
Total Westlake Chemical Corporation stockholders' equity	5,590		4,874
Noncontrolling interests	486		495
Total equity	6,076		5,369
Total liabilities and equity	$	11,602	$	12,076

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WESTLAKE CHEMICAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Twelve Months Ended December 31,
	2018			2017
	(In millions of dollars)
Cash flows from operating activities
Net income	$	1,034		$	1,339
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	641			601
Deferred income taxes	62			(534		)
Other balance sheet changes	(328		)	122
Net cash provided by operating activities	1,409			1,528
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			(13		)
Additions to property, plant and equipment	(702		)	(577		)
Additions to investments in unconsolidated subsidiaries	(68		)	(66		)
Other	16			4
Net cash used for investing activities	(754		)	(652		)
Cash flows from financing activities
Debt issuance costs	—			(6		)
Dividends paid	(120		)	(103		)
Distributions to noncontrolling interests	(45		)	(28		)
Proceeds from notes payable and drawdown of revolver	14			978
Net proceeds from issuance of Westlake Chemical Partners LP common units	—			111
Repayment of term loan	—			(150		)
Repayment of revolver	—			(550		)
Redemption and repayment of notes payable	(1,179		)	(257		)
Repurchase of common stock for treasury	(106		)	—
Other	9			11
Net cash provided by (used for) financing activities	(1,427		)	6
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(7		)	26
Net increase (decrease) in cash, cash equivalents and restricted cash	(779		)	908
Cash, cash equivalents and restricted cash at beginning of the year	1,554			646
Cash, cash equivalents and restricted cash at end of the year	$	775		$	1,554

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WESTLAKE CHEMICAL CORPORATION

SEGMENT INFORMATION

(Unaudited)

	Three Months Ended December 31,						Twelve Months Ended December 31,
	2018			2017			2018			2017
	(In millions of dollars)
Net external sales
Olefins	$	493		$	517		$	2,019		$	2,051
Vinyls	1,502			1,493			6,616			5,990
	$	1,995		$	2,010		$	8,635		$	8,041
Income (loss) from operations
Olefins	$	90		$	166		$	573		$	655
Vinyls	125			214			913			639
Corporate and other	(8		)	(17		)	(78		)	(69		)
	$	207		$	363		$	1,408		$	1,225
Depreciation and amortization
Olefins	$	36		$	34		$	138		$	145
Vinyls	129			117			491			449
Corporate and other	3			1			12			7
	$	168		$	152		$	641		$	601
Other income (loss), net
Olefins	$	—		$	1		$	4		$	3
Vinyls	3			—			35			7
Corporate and other	(4		)	1			13			5
	$	(1	)	$	2		$	52		$	15

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WESTLAKE CHEMICAL CORPORATION

RECONCILIATION OF EBITDA TO NET INCOME, INCOME FROM

OPERATIONS AND NET CASH PROVIDED BY OPERATING ACTIVITIES

(Unaudited)

	Three Months Ended September 30,			Three Months Ended December 31,						Twelve Months Ended December 31,
	2018			2018			2017			2018			2017
	(In millions of dollars)
Net cash provided by operating activities	$	606		$	254		$	566		$	1,409		$	1,528
Changes in operating assets and liabilities and other	(259		)	(135		)	(307		)	(313		)	(723		)
Deferred income taxes	(29		)	12			557			(62		)	534
Net income	318			131			816			1,034			1,339
Less:
Other income (expense), net	23			(1		)	2			52			15
Interest expense	(28		)	(30		)	(40		)	(126		)	(159		)
(Provision for) benefit from income taxes	(73		)	(45		)	491			(300		)	258
Income from operations	396			207			363			1,408			1,225
Add:
Depreciation and amortization	161			168			152			641			601
Other income (expense), net	23			(1		)	2			52			15
EBITDA	$	580		$	374		$	517		$	2,101		$	1,841

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WESTLAKE CHEMICAL CORPORATION

SUPPLEMENTAL INFORMATION

Product Sales Price and Volume Variance by Operating Segments

	Fourth Quarter 2018 vs. Fourth Quarter 2017				Fourth Quarter 2018 vs. Third Quarter 2018
	Average Sales Price		Volume		Average Sales Price		Volume
Olefins	-13.1	%	+8.4	%	-5.6	%	-3.3	%
Vinyls	+0.2	%	+0.4	%	-3.0	%	-9.3	%
Company	-3.2	%	+2.5	%	-3.7	%	-7.8	%

Average Quarterly Industry Prices ⁽¹⁾ 

	Quarter Ended
	December 31, 2017	March 31, 2018	June 30, 2018	September 30, 2018	December 31, 2018
Ethane (cents/lb)	8.4	8.5	9.7	14.3	11.6
Propane (cents/lb)	22.6	20.2	20.7	23.5	18.7
Ethylene (cents/lb) (2)	28.4	23.6	14.8	17.3	20.2
Polyethylene (cents/lb) (3)	77.5	73.7	73.7	70.0	68.0
Styrene (cents/lb) (4)	91.1	98.3	93.0	90.3	84.3
Caustic soda ($/short ton) (5)	703.3	748.3	795.0	781.7	748.3
Chlorine ($/short ton) (6)	332.5	332.5	347.5	347.5	347.5
PVC (cents/lb) (7)	65.2	67.2	67.5	67.5	67.5

________________

(1) Industry pricing data was obtained through IHS Markit ("IHS"). We have not independently verified the data.

(2) Represents average North American spot prices of ethylene over the period as reported by IHS.

(3) Represents average North American net transaction prices of polyethylene low density GP-Film grade over the period as reported by IHS.

(4) Represents average North American contract prices of styrene over the period as reported by IHS.

(5) Represents average North American United States Gulf Coast undiscounted contract prices of caustic soda over the period as reported by IHS. During the first quarter of 2018, IHS discontinued the previous caustic soda index that we used. For comparability, the average 2017 caustic soda is based on the current index.

(6) Represents average North American contract prices of chlorine (into chemicals) over the period as reported by IHS.

(7) Represents average North American contract prices of polyvinyl chloride (PVC) over the period as reported by IHS.

ix

EX-99.2

Westlake Chemical Corporation Fourth Quarter 2018 Earnings Presentation

Westlake Chemical Corporation 2018 Business Highlights . 2018 annual net income of $1.0 billion, or $7.62 per diluted share . Record annual performance . Record annual sales of $8.6 billion . Record annual income from operations of $1.4 billion . Record annual EBITDA of $2.1 billion . Achieved Axiall synergies of $275 million . Retired $1.2 billion of debt in 2018 . Increased quarterly dividend ~20% in August 2018 . Expanded Westlake stock repurchase program . Finalized purchase of NAKAN™, a global PVC compounding business 2

Westlake Chemical Corporation Fourth Quarter and Full Year 2018 Financial Highlights Q4 2018 vs. Q4 2018 vs. ($ in millions) Q4 2018 Q4 2017 Q4 2017 Q3 2018 Q3 2018 2018 2017 2018 vs. 2017 Sales $1,995 $2,010 (1%) $2,255 (12%) $8,635 $8,041 7% Operating Income $207 $363 (43%) $396 (48%) $1,408 $1,225 15% Vinyls EBITDA $257 $331 (22%) $391 (34%) $1,439 $1,095 31% Olefins EBITDA $126 $201 (37%) $198 (36%) $715 $803 (11%) Corporate EBITDA ($9) ($15) 40% ($9) - ($53) ($57) 7% EBITDA¹ $374 $517 (28%) $580 (36%) $2,101 $1,841 14% Fourth Quarter 2018 vs. Fourth Quarter 2017 Full Year 2018 vs. Full Year 2017 + Higher polyethylene sales volumes + Higher caustic soda sales prices and volumes + Higher caustic soda sales prices and volumes + Higher polyethylene sales volumes - Higher ethane feedstock costs + Higher PVC sales volumes - Lower sales prices for polyethylene and PVC resin + Lower purchased ethylene costs - Higher fuel costs - Higher ethane feedstock costs (1) Reconciliations of EBITDA, Vinyls EBITDA, Olefins EBITDA and Corporate EBITDA to the applicable GAAP measures can be found on pages 8 and 9 3

Westlake Chemical Corporation Earnings Impact – Ethane Feedstock Costs Ethane $ per Gallon $0.60 $0.50 $0.40 $0.30 $0.20 $0.10 $- Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 . Higher ethane feedstock costs – the increases in ethane costs experienced in August and September 2018 impacted our earnings in the fourth quarter of 2018 . Our FIFO method of accounting provides a benefit in periods of rising costs and a headwind in periods of declining costs . It takes four to six weeks for purchased ethane costs to be reflected in our cost of sales 4

Vinyls Segment Performance Q4 2018 vs. Q4 2018 vs. ($ in millions) Q4 2018 Q4 2017 Q4 2017 Q3 2018 Q3 2018 2018 2017 2018 vs. 2017 Sales $1,502 $1,493 1% $1,714 (12%) $6,616 $5,990 10% Operating Income $125 $214 (42%) $251 (50%) $913 $639 43% EBITDA $257 $331 (22%) $391 (34%) $1,439 $1,095 31% Fourth Quarter 2018 vs. Fourth Quarter 2017 Fourth Quarter 2018 vs. Third Quarter 2018 + Higher caustic soda sales volumes and − Lower sales prices for caustic soda and PVC prices − Higher ethane feedstock and purchased − Lower PVC prices ethylene − Higher ethane feedstock costs − Higher fuel costs − Higher fuel costs − Seasonally lower sales volumes for downstream vinyls business Q4 2018 Q4 2018 vs. vs. Q4 2017 Q3 2018 Average Average Sales Price Volume Sales Price Volume + 0.2% + 0.4% - 3.0% - 9.3% 5

Olefins Segment Performance Q4 2018 vs. Q4 2018 vs. ($ in millions) Q4 2018 Q4 2017 Q4 2017 Q3 2018 Q3 2018 2018 2017 2018 vs. 2017 Sales $493 $517 (5%) $541 (9%) $2,019 $2,051 (2%) Operating Income $90 $166 (46%) $162 (44%) $573 $655 (13%) EBITDA $126 $201 (37%) $198 (36%) $715 $803 (11%) Fourth Quarter 2018 vs. Fourth Quarter 2017 Fourth Quarter 2018 vs. Third Quarter 2018 + Higher polyethylene sales volumes - Lower polyethylene sales prices - Lower polyethylene sales prices - Lower sales volumes for our major products - Higher ethane feedstock costs - Higher ethane feedstock costs - Higher fuel costs - Higher fuel costs Q4 2018 Q4 2018 vs. vs. Q4 2017 Q3 2018 Average Average Sales Price Volume Sales Price Volume - 13.1% + 8.4% - 5.6% - 3.3% 6

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Reconciliation of EBITDA to Net Income, Income from Operations and Net Cash Provided by Operating Activities Three Months Ended Three Months Ended December 31, September 30, Twelve Months Ended December 31, (in $ millions) 2018 2017(1) 2018 2018 2017(1) Net cash provided by operating $ 254 $ 566 $ 606 $ 1,409 $ 1,528 Changes in operating assets and liabilities and other (135) (307) (259) (313) (723) Deferred income taxes 12 557 (29) (62) 534 Net income 131 816 318 1,034 1,339 Less: Other income (expense), net (1) 2 23 52 15 Interest expense (30) (40) (28) (126) (159) (Provision for) benefit from income taxes (45) 491 (73) (300) 258 Operating Income 207 363 396 1,408 1,225 Add: Depreciation and amortization 168 152 161 641 601 Other income (expense), net (1) 2 23 52 15 EBITDA $ 374 $ 517 $ 580 $ 2,101 $ 1,841 1 - Net income for the fourth quarter of 2017 included a one-time non-cash benefit of $591 million as a result of the 8 U.S. Tax Cuts and Jobs Act

Reconciliation of Vinyls, Olefins and Corporate EBITDA to Applicable Operating Income Loss Three Months Ended Three Months Ended December 31, September 30, Twelve Months Ended December 31, (in $ millions) 2018 2017 2018 2018 2017 Vinyls EBITDA $ 257 $ 331 $ 391 $ 1,439 $ 1,095 Less: Depreciation and Amortization 129 117 124 491 449 Other Income (Expenses), net 3 0 16 35 7 Vinyls Operating Income (Loss) 125 214 251 913 639 Olefins EBITDA 126 201 198 715 803 Less: Depreciation and Amortization 36 34 35 138 145 Other Income (Expenses), net 0 1 1 4 3 Olefins Operating Income (Loss) 90 166 162 573 655 Corporate EBITDA (9) (15) (9) (53) (57) Less: Depreciation and Amortization 3 1 2 12 7 Other Income (Expenses), net (4) 1 6 13 5 Corporate Operating Income (Loss) (8) (17) (17) (78) (69) Vinyls Operating Income (Loss) 125 214 251 913 639 Olefins Operating Income (Loss) 90 166 162 573 655 Corporate Operating Income (Loss) (8) (17) (17) (78) (69) Total Operating Income (Loss) $ 207 $ 363 $ 396 $ 1,408 $ 1,225 9

Safe Harbor Language This presentation contains certain forward-looking statements. Actual results may differ materially depending on factors such as general economic and business conditions; the cyclical nature of the chemical industry; the availability, cost and volatility of raw materials and energy; uncertainties associated with the United States, Europe and worldwide economies, including those due to political tensions in the Middle East and elsewhere; current and potential governmental regulatory actions in the United States and Europe and regulatory actions and political unrest in other countries; industry production capacity and operating rates; the supply/ demand balance for our products; competitive products and pricing pressures; instability in the credit and financial markets; access to capital markets; terrorist acts; operating interruptions including leaks, explosions, fires, weather-related incidents, mechanical failure, unscheduled downtime, labor difficulties, transportation interruptions, spills and releases and other environmental risks; changes in laws or regulations; technological developments; our ability to implement our business strategies; creditworthiness of our customers; and other factors described in our reports filed with the Securities and Exchange Commission. Many of these factors are beyond our ability to control or predict. Any of these factors, or a combination of these factors, could materially affect our future results of operations and the ultimate accuracy of the forward-looking statements. These forward-looking statements are not guarantees of our future performance, and our actual results and future developments may differ materially from those projected in the forward-looking statements. Management cautions against putting undue reliance on forward-looking statements. Every forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements. Investor Relations Contacts Steve Bender Jeff Holy Executive Vice President & Vice President & Chief Financial Officer Treasurer Westlake Chemical 2801 Post Oak Boulevard, Suite 600 Houston, Texas 77056 713-960-9111 10