Westlake Chemical Partners
Annual Report 2019

Plain-text annual report

Table of ContentsUNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year EndedDecember 31, 2019 orTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File No. 001-32260 Westlake Chemical Corporation(Exact name of registrant as specified in its charter) Delaware 76-0346924(State or other jurisdiction ofincorporation or organization) (I.R.S. EmployerIdentification No.)2801 Post Oak Boulevard, Suite 600Houston, Texas 77056(Address of principal executive offices, including zip code)(713) 960-9111(Registrant's telephone number, including area code)Securities registered pursuant to Section 12(b) of the Act:Title of each classTrading Symbol(s)Name of each exchange on which registeredCommon Stock, $0.01 par valueWLKThe New York Stock Exchange1.625% Senior Notes due 2029WLK29The New York Stock ExchangeSecurities registered pursuant to Section 12(g) of the Act: NoneIndicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes ☐ No ☒Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirementsfor the past 90 days. Yes ☒ No ☐Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or anemerging growth company. See definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule12b-2 of the Exchange Act:Large accelerated filer Accelerated filer Non-accelerated filer Smaller reporting company 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 orrevised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒The aggregate market value of the registrant's voting stock held by non-affiliates of the registrant on June 30, 2019, the end of the registrant's most recentlycompleted second fiscal quarter, based on a closing price on June 28, 2019 of $69.46 on the New York Stock Exchange was approximately $2.5 billion.There were 128,392,753 shares of the registrant's common stock outstanding as of February 12, 2020.DOCUMENTS INCORPORATED BY REFERENCE:Certain information required by Part II and Part III of this Form 10-K is incorporated by reference from the registrant's definitive Proxy Statement to be filedpursuant to Regulation 14A with respect to the registrant's 2020 Annual Meeting of Stockholders to be held on May 15, 2020.Table of ContentsTABLE OF CONTENTS Page PART I Item 1) Business11A) Risk Factors91B) Unresolved Staff Comments222) Properties223) Legal Proceedings224) Mine Safety Disclosure22 Information about our Executive Officers22 PART II 5) Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities256) Selected Financial and Operational Data277) Management's Discussion and Analysis of Financial Condition and Results of Operations307A) Quantitative and Qualitative Disclosures about Market Risk448) Financial Statements and Supplementary Data469) Changes in and Disagreements with Accountants on Accounting and Financial Disclosure909A) Controls and Procedures909B) Other Information90 PART III 10) Directors, Executive Officers and Corporate Governance9111) Executive Compensation9112) Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters9113) Certain Relationships and Related Transactions, and Director Independence9114) Principal Accountant Fees and Services91 PART IV 15) Exhibits and Financial Statement Schedules9216) Form 10-K Summary95Table of ContentsExplanatory NoteReferences in this Annual Report on Form 10-K (this "report") to "we," "our," "us" or like terms refer to Westlake Chemical Corporation ("Westlake" or the"Company").Cautionary Statements about Forward-Looking StatementsThe Private Securities Litigation Reform Act of 1995 provides safe harbor provisions for forward-looking information. Certain of the statements contained inthis Form 10-K are forward-looking statements. All statements, other than statements of historical facts, included in this Form 10-K that address activities, eventsor developments that we expect, project, believe or anticipate will or may occur in the future are forward-looking statements. Forward-looking statements can beidentified by the use of words such as "believes," "intends," "may," "should," "could," "anticipates," "expected" or comparable terminology, or by discussions ofstrategies or trends. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we cannot give any assurances thatthese expectations will prove to be correct. Forward-looking statements relate to matters such as:•future operating rates, margins, cash flows and demand for ourproducts;•industry market outlook, including the price of crudeoil;•production capacities;•currency devaluation;•our ability to borrow additional funds under our creditagreement;•our ability to meet our liquidityneeds;•our ability to meet debt obligations under our debtinstruments;•our intended quarterly dividends;•future capacity additions and expansions in the industries in which wecompete;•results of acquisitions;•timing, funding and results of capitalprojects;•pension plan obligations, funding requirements and investmentpolicies;•compliance with present and future environmental regulations and costs associated with environmentally-related penalties, capital expenditures,remedial actions and proceedings, including any new laws, regulations or treaties that may come into force to limit or control carbon dioxide and otherGHG emissions or to address other issues of climate change;•effects of pending legal proceedings;and•timing of and amount of capital expenditures.We have based these statements on assumptions and analyses in light of our experience and perception of historical trends, current conditions, expectedfuture developments and other factors we believe were appropriate in the circumstances when the statements were made. Forward-looking statements by theirnature involve substantial risks and uncertainties that could significantly impact expected results, and actual future results could differ materially from thosedescribed in such statements. While it is not possible to identify all factors, we continue to face many risks and uncertainties. Among the factors that could causeactual future results to differ materially are the risks and uncertainties discussed under "Risk Factors" and those described from time to time in our other filingswith the SEC including, but not limited to, the following:•general economic and business conditions;•the cyclical nature of the chemical and building productsindustries;•the availability, cost and volatility of raw materials andenergy;•uncertainties associated with the United States, European and worldwide economies, including those due to political tensions and unrest in the MiddleEast and elsewhere;•current and potential governmental regulatory actions in the United States and othercountries;•industry production capacity and operatingrates;•the supply/demand balance for ourproducts;•competitive products and pricing pressures;iTable of Contents•instability in the credit and financialmarkets;•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, including trade policies;•technological developments;•foreign currency exchangerisks;•our ability to implement our business strategies;and•creditworthiness of ourcustomers.Many of such factors are beyond our ability to control or predict. Any of the factors, or a combination of these factors, could materially affect our futureresults 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 puttingundue reliance on forward-looking statements or projecting any future results based on such statements or present or prior earnings levels. Every forward-lookingstatement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements.Industry and Market DataIndustry and market data used throughout this Form 10-K were obtained through internal company research, surveys and studies conducted by unrelatedthird parties and publicly available industry and general publications, including information from IHS Markit ("IHS"). We have not independently verified marketand industry data from external sources. While we believe internal company estimates are reliable and market definitions are appropriate, neither such estimatesnor these definitions have been verified by any independent sources.Production CapacityUnless we state otherwise, annual production capacity estimates used throughout this Form 10-K represent rated capacity of the facilities at December 31,2019. We calculated rated capacity by estimating the number of days in a typical year that a production unit of a plant is expected to operate, after allowing fordowntime for regular maintenance, and multiplying that number by an amount equal to the unit's optimal daily output based on the design feedstock mix. Becausethe rated capacity of a production unit is an estimated amount, actual production volumes may be more or less than the rated capacity.iiTable of ContentsPART IItem 1. BusinessGeneralWe are a vertically integrated global manufacturer and marketer of basic chemicals, vinyls, polymers and building products. Our products include some ofthe most widely used materials in the world, which are fundamental to many diverse consumer and industrial markets, including flexible and rigid packaging,automotive products, coatings, water treatment, refrigerants, residential and commercial construction as well as other durable and non-durable goods. We operatein two principal operating segments, Olefins and Vinyls. We are highly integrated along our olefins product chain with significant downstream integration intopolyethylene and styrene monomer. We are also an integrated global producer of vinyls with substantial downstream integration into polyvinyl chloride ("PVC")building products.We began operations in 1986 after our first polyethylene plant, an Olefins segment business, near Lake Charles, Louisiana was acquired from OccidentalPetroleum Corporation. We began our vinyls operations in 1990 with the acquisition of a vinyl chloride monomer ("VCM") plant in Calvert City, Kentucky fromThe B.F.Goodrich Company. In 1992, we commenced our Vinyls segment's building products operations after acquiring three PVC pipe plants. Since 1986, wehave grown rapidly into an integrated global producer of basic chemicals, vinyls, polymers and building products. We achieved this growth by acquiring existingplants or constructing new plants and completing numerous capacity or production line expansions. We regularly consider acquisitions and other internal andexternal growth opportunities that would be consistent with, or complementary to, our overall business strategy.In 2014, we formed Westlake Chemical Partners LP ("Westlake Partners") to operate, acquire and develop ethylene production facilities and related assets.Also in 2014, Westlake Partners completed an initial public offering. As of February 12, 2020, Westlake Partners' assets consisted of a 22.8% limited partnerinterest in Westlake Chemical OpCo LP ("OpCo"), as well as the general partner interest in OpCo. Prior to the Westlake Partners IPO, OpCo's assets were wholly-owned by us. OpCo's assets include two ethylene production facilities at our olefins facility in Lake Charles, one ethylene production facility at our Calvert Citysite and a 200-mile common carrier ethylene pipeline that runs from Mont Belvieu, Texas to the Longview, Texas site, which includes our Longview polyethyleneproduction facility. We retain a 77.2% limited partner interest in OpCo, a 40.1% limited partner interest in Westlake Partners (consisting of 14,122,230 commonunits), a general partner interest in Westlake Partners and incentive distribution rights. The operations of Westlake Partners are consolidated in our financialstatements. We are party to certain agreements with Westlake Partners and OpCo whereby, among other things, OpCo sells us 95% of the ethylene it produces on acost-plus basis that is expected to generate a fixed margin per pound of $0.10. We use this ethylene in the production processes of both our Olefins and Vinylssegments. For more information, see "—Olefins Business" and "—Vinyls Business" below.On January 2, 2019, we completed the acquisition of NAKANTM, a global compounding solutions business. NAKAN's products are used in a wide-variety ofapplications, including in the automotive, building and construction, and medical industries. With this acquisition, our compounding business now has facilitiesworldwide in China, France, Germany, Italy, Japan, Mexico, Spain, the United States and Vietnam, as well as a world-class research facility in France and severalapplication laboratories.On November 12, 2019, we, through one of our subsidiaries, Eagle US 2 LLC ("Eagle"), completed the acquisition of an additional 34.8% of themembership interests in LACC, LLC ("LACC") from Lotte Chemical USA Corporation, a subsidiary of Lotte Chemical Corporation ("Lotte"), for approximately$817 million (the "Transaction"). Prior to the Transaction, Eagle owned approximately 12% of the membership interests in LACC. As of December 31, 2019, weowned an aggregate 46.8% membership interest in LACC. The LACC ethylene plant has 2.2 billion pounds per year of ethylene production capacity and isadjacent to our chlor-alkali facility in Lake Charles. During the third quarter of 2019, the LACC ethylene plant began commercial operations. As a result of theTransaction, we will receive our proportionate share of LACC's ethylene production on a cash-cost basis, which is expected to benefit our integrated downstreamoperations.We benefit from highly integrated production facilities that allow us to process raw materials into higher value-added chemicals and building products. As ofFebruary 12, 2020, we (directly and through OpCo, our investment in LACC, and our 95%- and 60%-owned joint ventures in China and Taiwan, respectively) hadapproximately 44.0 billion pounds per year of aggregate production capacity at numerous manufacturing sites in North America, Europe and Asia.1Table of ContentsOlefins BusinessProductsOlefins are the basic building blocks used to create a wide variety of petrochemical products. We manufacture ethylene (through OpCo), polyethylene,styrene and associated co-products at our manufacturing facility in Lake Charles and polyethylene at our Longview facility. We have two ethylene plants, whichare owned by OpCo, two polyethylene plants and one styrene monomer plant at our olefins facility in Lake Charles. We have three polyethylene plants and aspecialty polyethylene wax plant at our Longview site.The following table illustrates our production capacities at February 12, 2020 by principal product and the primary end uses of these materials:Product Annual Capacity End Uses Principal Manufacturing Facilities (2) (3) (Millions of pounds) Ethylene (1) 2,990 Polyethylene, ethylene dichloride ("EDC"),styrene, ethylene oxide/ethylene glycol Lake Charles, LouisianaLow-Density Polyethylene("LDPE") 1,500 High clarity packaging and bags, shrink films, foodpackaging, coated paper board, cup stock, paperfolding cartons, lids, closures and generalpurpose molding Lake Charles, LouisianaLongview, TexasLinear Low-Density Polyethylene("LLDPE") 1,070 Heavy-duty films and bags, general purpose liners Lake Charles, LouisianaLongview, TexasStyrene 570 Consumer disposables, packaging material,appliances, paints and coatings, resins andbuilding materials Lake Charles, Louisiana______________________________(1)Production capacity owned byOpCo.(2)We lease the land on which our Longview, Texas facility islocated.(3)We own the Lake Charles, Louisianafacility.Ethylene. Ethylene is the world's most widely used petrochemical in terms of volume. It is the key building block used to produce a large number of highervalue-added chemicals including polyethylene, EDC, VCM and styrene. OpCo has the capacity to produce approximately 3.0 billion pounds of ethylene per year atour olefins facility at our Lake Charles site, and we have the capability to consume all of OpCo's production that we purchase at Lake Charles to producepolyethylene and styrene monomer in our Olefins business and to produce VCM and EDC in our Vinyls business. OpCo also produces ethylene for our Vinylssegment at our Calvert City site, and substantially all of the ethylene we purchase from OpCo at Calvert City is used internally in the production of VCM. ForOpCo's annual ethylene production that is purchased by us for our Vinyls business, see "Business—Vinyls Business." In addition, we (through OpCo) produceethylene co-products including chemical grade propylene, crude butadiene, pyrolysis gasoline and hydrogen. We (through OpCo) sell our entire output of these co-products to external customers.Polyethylene. Polyethylene, the world's most widely consumed polymer, is used in the manufacture of a wide variety of film, coatings and molded productapplications primarily used in packaging. Polyethylene is generally classified as either LDPE, LLDPE or high-density polyethylene ("HDPE"). The densitycorrelates to the relative stiffness of the end-use products. The difference between LDPE and LLDPE is molecular, and products produced from LLDPE, ingeneral, have higher strength properties than products produced from LDPE. LDPE exhibits better clarity and other physical properties and is used in end productssuch as bread bags, food wraps, milk carton coatings and food packaging. LLDPE is used for higher film strength applications such as stretch film and heavy dutysacks. HDPE is used to manufacture products such as grocery, merchandise and trash bags, rigid plastic containers, plastic closures and pipe.2Table of ContentsWe are the second-largest producer of LDPE by capacity in North America and predominantly use the autoclave technology (versus tubular technology),which is capable of producing higher-margin specialty polyethylene products. In 2019, our annual capacity of approximately 1.5 billion pounds was available innumerous formulations to meet the needs of our diverse customer base. We also have the capacity to produce approximately 1.1 billion pounds of LLDPE per yearin various formulations. We produce LDPE and LLDPE at both the Lake Charles and Longview facilities. Our Lake Charles and Longview facilities also have thecapability to produce HDPE. We sell polyethylene to external customers as a final product in pellet form.Styrene. Styrene is used to produce derivatives such as polystyrene, acrylonitrile butadiene styrene, unsaturated polyester and synthetic rubber. Thesederivatives are used in a number of applications including consumer disposables, food packaging, housewares, paints and coatings, building materials, tires andtoys. We produce styrene at our Lake Charles plant, where we have the capacity to produce approximately 570 million pounds of styrene per year, all of which issold to external customers.FeedstocksWe are highly integrated along our olefins product chain. We (through OpCo) produce most of the ethylene required to produce our polyethylene andstyrene. Ethylene can be produced from either petroleum liquid feedstocks, such as naphtha, condensates and gas oils, or from natural gas liquid feedstocks, suchas ethane, propane and butane. Both of OpCo's Lake Charles ethylene plants use ethane as the primary feedstock. Pursuant to a feedstock supply agreementbetween us and OpCo, OpCo receives ethane feedstock at the olefins facility at our Lake Charles site through several pipelines from a variety of suppliers in Texasand Louisiana. We own a 50% interest in a 104-mile natural gas liquids pipeline from Mont Belvieu to our Lake Charles site. OpCo owns a 200-mile ethylenepipeline that runs from Mont Belvieu to our Longview site.In addition to ethylene supplied by OpCo, we also acquire ethylene from third parties in order to supply a portion of our Vinyls segment ethylenerequirements. We acquire butene and hexene to manufacture polyethylene and benzene to manufacture styrene. We receive butene and hexene at the Lake Charlessite and hexene at the Longview site via rail car from several suppliers. We receive benzene via barges, ships and pipeline pursuant to short-term arrangements. Wepurchase butene and hexene pursuant to multi-year contracts, some of which are renewable for an additional term subject to either party to the contract notifyingthe other party that it does not wish to renew the contract. We purchase electricity for our Lake Charles facility under long-term industrial contracts.Marketing, Sales and DistributionWe have an internal sales force that sells our products directly to our customers. Our polyethylene customers are some of the nation's largest producers offilm and flexible packaging.We and OpCo sell ethylene and ethylene co-products to external customers. OpCo's primary ethylene co-products are chemical grade propylene, crudebutadiene, pyrolysis gasoline and hydrogen.We have storage agreements and exchange agreements that allow us and OpCo access to customers who are not directly connected to the pipeline systemthat we own. OpCo ships crude butadiene and pyrolysis gasoline by rail or truck. Additionally, we transport our polyethylene and styrene by rail or truck. Further,styrene can be transported by barge or ship.No single customer accounted for 10% or more of net sales for the Olefins segment in 2019.CompetitionThe markets in which our Olefins business operates are highly competitive. We compete on the basis of customer service, product deliverability, quality,consistency, performance and price. Our competitors in the ethylene, polyethylene and styrene markets are some of the world's largest chemical companies,including Chevron Phillips Chemical Company, Dow Inc., ExxonMobil Chemical Company, Formosa Plastics Corporation, LyondellBasell Industries, N.V.,NOVA Chemicals Corporation and Sasol Limited.3Table of ContentsVinyls BusinessProductsPrincipal products in our integrated Vinyls segment include PVC, VCM, EDC, chlor-alkali (chlorine and caustic soda) and chlorinated derivative productsand, through OpCo and LACC, ethylene. We also manufacture and sell PVC compounds and building products fabricated primarily from PVC, includingresidential siding, trim and moldings; pipe and fittings for various water, sewer, electrical and industrial applications; profiles for windows and doors; decking;films for various inflatables, wallcovering, tape and roofing applications; and composite roof tiles. We manage our integrated Vinyls production chain, from thebasic chemicals to finished building products, to optimize product margins and capacity utilization. Our primary North American chemical manufacturing facilitiesare located in our Calvert City, Kentucky and Lake Charles, Plaquemine and Geismar, Louisiana sites. Our Calvert City site includes an ethylene plant, which isowned by OpCo, a chlor-alkali plant, a VCM plant and a PVC plant. Our Lake Charles site includes three chlor-alkali plants, two VCM plants, a chlorinatedderivative products plant and cogeneration assets. Our Plaquemine site includes a chlor-alkali plant, a VCM plant, a PVC plant and cogeneration assets. OurGeismar site includes a chlor-alkali plant, a VCM plant and a PVC plant. We also produce chlorine, caustic soda, hydrogen and chlorinated derivative products atour Natrium, West Virginia; Longview, Washington and Beauharnois, Quebec facilities and PVC resin at our facility in Aberdeen, Mississippi. Our Europeanchemical manufacturing facilities are located in Germany and include two chlor-alkali plants, two VCM plants and five PVC plants. As of February 12, 2020, weowned 36 building product and PVC compound facilities in North America, Europe and Asia. Our Asian vinyls chemical manufacturing facilities are located nearShanghai, in China, and in Kaohsiung, Taiwan, through our 95%- and 60%-owned joint ventures, respectively, and include a PVC plant, a PVC film and sheetplant, a chlor-alkali plant and a chlorinated derivative products plant.4Table of ContentsThe following table illustrates our production capacities at February 12, 2020 by principal product and the end uses of these products:Product (1) Annual Capacity (2) End Uses Principal Manufacturing Facilities (4) (5) (6) (Millions of pounds) Specialty PVC 1,090 Automotive sealants, cable sheathing, medicalapplications and other applications Burghausen, Gendorf, Schkopau and Cologne,GermanyCommodity PVC 6,700 Construction materials including pipe, siding,profiles for windows and doors, film and sheetfor packaging and other applications Calvert City, Kentucky,Geismar, Louisiana,Plaquemine, Louisiana,Aberdeen, Mississippi,Cologne and Knapsack, GermanyVCM 7,630 PVC, PVC Compounds Calvert City, Kentucky,Geismar, Louisiana,Plaquemine, Louisiana,Lake Charles, Louisiana,Gendorf and Knapsack, GermanyChlorine 7,140 VCM, organic/inorganic chemicals, bleach Calvert City, Kentucky,Geismar, Louisiana,Plaquemine, Louisiana,Lake Charles, Louisiana,Natrium, West Virginia,Gendorf and Knapsack, GermanyCaustic Soda 7,860 Pulp and paper, organic/inorganic chemicals,neutralization, alumina Calvert City, Kentucky,Geismar, Louisiana,Plaquemine, Louisiana,Lake Charles, Louisiana,Natrium, West Virginia,Gendorf and Knapsack, GermanyChlorinated DerivativeProducts 2,290 Coatings, flavorants, films, refrigerants, watertreatment applications, chemicals andpharmaceutical production Lake Charles, Louisiana,Natrium, West Virginia,Plaquemine, Louisiana,Longview, Washington,Beauharnois, CanadaEthylene (3) 1,760 VCM Calvert City, KentuckyBuilding Products andPVC Compounds 3,380 Pipe: water and sewer, plumbing, irrigation,conduit; fittings; profiles and foundationbuilding products; exteriors; window and doorcomponents; deck components; siding, trimand mouldings; film and sheet; composite rooftiles; Compounds: automotive interior,automotive exterior, stabilizers, medicalapplications, profiles, moldings, electricalproducts, casing and packaging ______________________________(1)EDC, a VCM intermediate product, is not included in the table.(2)Includes capacity related to our 95%- and 60%-owned Asian jointventures.(3)Includes production capacity in Calvert City owned by OpCo and our portion of LACC's production capacity in LakeCharles.(4)Except as noted in notes (5) and (6) below, we own each of thesefacilities.(5)We lease the land on which our Gendorf, Burghausen, Knapsack, Schkopau and Cologne, Germany and Longview, Washington facilities arelocated.(6)We lease a portion of the land on which our Aberdeen and Calvert City facilities arelocated.5Table of ContentsPVC. PVC, the world's third most widely used plastic, is an attractive alternative to traditional materials such as glass, metal, wood, concrete and otherplastic materials because of its versatility, durability and cost-competitiveness. PVC is produced from VCM, which is, in turn, made from chlorine and ethylene.PVC compounds are highly customized formulations that offer specific end-use properties based on customer-determined manufacturing specifications. PVCcompounds are made by combining PVC resin with various additives in order to make either rigid and impact-resistant or soft and flexible compounds. Thevarious compounds are then fabricated into end-products through extrusion, calendering, injection-molding or blow-molding.We are the second-largest PVC producer in the world. With the completion of our previously announced expansion projects at our Geismar and Burghausenplants in 2019, we have the capacity to produce approximately 6.7 billion pounds and 1.1 billion pounds of commodity and specialty PVC per year, respectively, atour various facilities globally. We use some of our PVC internally in the production of our building products and PVC compounds. The remainder of our PVC issold to downstream fabricators and the international markets.VCM. VCM is used to produce PVC, solvents and PVC-related products. We use ethylene and chlorine to produce EDC, which is used in turn, to produceVCM. We have the capacity to produce approximately 6.1 billion pounds and 1.5 billion pounds of VCM per year at our North American and European facilities,respectively. The majority of our VCM is used internally in our PVC operations. VCM and EDC not used internally are sold externally.Chlorine and Caustic Soda. We combine salt and electricity to produce chlorine and caustic soda, commonly referred to as chlor-alkali, at our Lake Charles,Plaquemine, Natrium, Calvert City, Geismar, Beauharnois, Longview (WA), Gendorf, Knapsack and Kaohsiung facilities. We are the second-largest chlor-alkaliproducer in the world. We use our chlorine production in our VCM and chlorinated derivative products plants. We currently have the capacity to supply all of ourchlorine requirements internally. Any remaining chlorine is sold into the merchant chlorine market. Our caustic soda is sold to external customers who use it for,among other things, the production of pulp and paper, organic and inorganic chemicals and alumina.Chlorinated Derivative Products. Our chlorinated derivative products include ethyl chloride, perchloroethylene, trichloroethylene, tri-ethane® solvents,VersaTRANS® solvents, calcium hypochlorite, hydrochloric acid ("HCL") and pelletized caustic soda ("PELS"). We have the capacity to produce approximately2.3 billion pounds of chlorinated derivative products per year, primarily at our Lake Charles, Natrium, Beauharnois and Longview (WA) facilities. The majority ofour chlorinated derivative products are sold to external customers who use these products for, among other things, refrigerants, water treatment applications,chemicals and pharmaceutical production, food processing, steel pickling, solvent and cleaning chemicals and natural gas and oil production.Ethylene. We utilize ethylene from OpCo's facility in Calvert City and LACC to produce VCM at our facilities. We obtain the remainder of the ethylene weneed for our Vinyls business from third party purchases. The use of ethane feedstock by our ethylene plants enables us to enhance our low cost vinyl chainintegration.Building Products and PVC Compounds. Products made from PVC are used in materials ranging from water and sewer systems to home and commercialapplications for siding, trim, mouldings, deck, window and door profiles. Our building products consist of two primary product groups: (i) exterior products, whichincludes siding, trim, mouldings, window profiles, decking products and roofing applications; and (ii) PVC pipe, specialty PVC pipe and fittings. We manufactureand market exterior products under the Royal Building Products®, Celect Cellular Exteriors by Royal®, Zuri Premium Decking by Royal®, Royal S4S TrimBoard®, Exterior Portfolio® and DaVinci® brand names. We manufacture and market specialty pipe and fittings, water, sewer, irrigation and conduit pipe productsunder the NAPCOTM brand name. We manufacture film and sheet at our Shanghai facility for both Asian and global markets. Flexible PVC compounds are usedfor wire and cable insulation, medical films and packaging, flooring, wall coverings, automotive interior and exterior trims and packaging. Rigid extrusion PVCcompounds are commonly used in window and door profiles, vertical blinds and construction products, including pipe and siding. Injection-molding PVCcompounds are used in specialty products such as computer housings and keyboards, appliance parts and containers. Powder compounds are primarily used inwindow and door profiles and pipe and fittings. The combined capacity of our 36 building products and PVC compounds plants is approximately 3.4 billionpounds per year.Electricity. Our Lake Charles, Plaquemine and Natrium cogeneration assets have the capacity to generate electricity of approximately 420, 240 and 100megawatts, respectively, per year. Our North American joint ventures include a 50% interest in RS Cogen LLC ("RS Cogen") that generates electricity, of whichour share is approximately 212 megawatts.6Table of ContentsFeedstocksWe are highly integrated along our vinyls production chain. We produce most of the ethylene required at our Calvert City and Lake Charles facilitiesutilizing ethane feedstock. The LACC ethylene facility is located adjacent to our vinyls facility in Lake Charles and has an ethylene production capacity of 2.2billion pounds per year. During the third quarter of 2019, the LACC ethylene plant began its commercial operations. At December 31, 2019, we, through one ofour subsidiaries, own 46.8% of the membership interests in LACC. We receive our proportionate share in ethylene production on a cash-cost basis and primarilyuse it to produce VCM. In Germany, we have access to, and partially own, an ethylene pipeline. The salt requirements for several of our larger chlor-alkali plantsare supplied internally from salt domes we either own or lease and is transported by pipelines we own. We purchase the salt required for our other chlor-alkaliplants pursuant to long-term contracts. Electricity and steam for one of our Lake Charles facilities are produced by both on-site cogeneration units and through atoll arrangement with RS Cogen, a joint venture in which we own a 50% interest. RS Cogen operates a process steam, natural gas-fired cogeneration facilityadjacent to the site. Electricity and steam for the Plaquemine facility is supplied internally by our on-site cogeneration unit. A portion of our Natrium facility'selectricity requirements is produced by our on-site generation unit, and the remainder is purchased. We purchase electricity for our remaining facilities under long-term contracts. We purchase VCM for our Asian PVC plant on a contract and spot basis.Our North American and Asian PVC facilities supply predominantly all of the PVC required for our building products plants. PVC required for the PVCcompounds plants is either internally sourced or externally purchased at market prices based on the location of the plants. The remaining feedstocks includepigments, fillers, stabilizers and other ingredients, which we purchase under short-term contracts based on prevailing market prices.Marketing, Sales and DistributionWe have a dedicated sales force for our business, organized by product line and region. In addition, we rely on distributors to market products to smallercustomers. We use some of our PVC internally in the production of our building products and PVC compounds. The remainder of our PVC is sold to downstreamfabricators and the international markets. We have the capacity to use a majority of our chlorine internally to produce VCM and EDC, most of which, in turn, isused to produce PVC. We also use our chlorine internally to produce chlorinated derivative products. We sell the remainder of our chlorine and substantially all ofour caustic soda production to external customers. The majority of our products are shipped from production facilities directly to the customer via pipeline, truck,rail, barge and/or ship. The remaining products are shipped from production facilities to third party chemical terminals and warehouses until being sold tocustomers.We are the second largest manufacturer of PVC pipe by capacity in North America. We sell a majority of our siding, trim and mouldings products, PVCpipe, specialty PVC pipe and fittings, and film and sheet products through a combination of our internal sales force and manufacturer's representatives. In Canada,we operate 18 company-owned distribution branches that sell our vinyl siding and accessories and trim and mouldings products, as well as pipe and fittings. Wealso engage in advertising programs primarily directed at trade professionals that are intended to develop awareness and interest in our products. In addition, wedisplay our building products at trade shows.No single customer accounted for 10% or more of net sales for the Vinyls segment in 2019.CompetitionThe markets in which our Vinyls business operates are highly competitive. Competition in the vinyls market is based on product availability, productperformance, customer service and price. We compete in the vinyls market with other producers including Formosa Plastics Corporation, Oxy Chem, LP, Shintech,Inc., Olin Corporation, GEON Performance Solutions, Teknor Apex Company, Inc., Orbia Advanced Corporation, S.A.B. de C.V., INOVYN ChlorVinyls Limited,VYNOVA Group and KEM ONE Group SAS.Competition in the building products market is based on on-time delivery, product quality, product innovation, customer service, product consistency andprice. We compete in the building products market with other producers and fabricators including Diamond Plastics Corporation, JM Eagle Inc., CornerstoneBuilding Brands, Inc., CertainTeed Corporation, IPEX Inc., Associated Materials LLC and the Azek Company.7Table of ContentsEnvironmentalAs is common in our industry, we are subject to environmental laws and regulations related to the use, storage, handling, generation, transportation,emission, discharge, disposal and remediation of, and exposure to, hazardous and non-hazardous substances and wastes in all of the countries in which we dobusiness. National, state or provincial and local standards regulating air, water and land quality affect substantially all of our manufacturing locations around theworld. Compliance with such laws and regulations has required and will continue to require capital expenditures and increase operating costs.It is our policy to comply with all environmental, health and safety requirements and to provide safe and environmentally sound workplaces for ouremployees. In some cases, compliance can be achieved only by incurring capital expenditures. In 2019, we made capital expenditures of $28 million related toenvironmental compliance. We estimate that we will make capital expenditures of approximately $40 million in 2020 and $34 million in 2021, respectively, relatedto environmental compliance. The expected 2020 and 2021 capital expenditures are relatively higher than the amounts we have spent related to environmentalcompliance in recent years in large part due to capital expenditures related to Environmental Protection Agency (the "EPA") regulations. The remainder of the2020 and 2021 estimated expenditures are related to equipment replacement and upgrades. We anticipate that stringent environmental regulations will continue tobe imposed on us and the industry in general. Although we cannot predict with certainty future expenditures, management believes that our current spending trendswill continue.From time to time, we receive notices or inquiries from government entities regarding alleged violations of environmental laws and regulations pertaining to,among other things, the disposal, emission and storage of chemical substances, including hazardous wastes. Item 103 of the SEC's Regulation S-K requiresdisclosure of certain environmental matters when a governmental authority is a party to the proceedings and the proceedings involve potential monetary sanctions,unless we reasonably believe such sanctions would not exceed $100,000.•In May 2013, an amendment to an existing consent order agreed to by the West Virginia Department of Environmental Protection and a predecessorof Axiall required that it, among other things, pay a penalty in the amount of $449,000 and continue certain corrective actions associated withdischarges of hexachlorocyclohexane (commonly referred to as BHC) from the Natrium facility's effluent discharge outfalls. The penalty was paid andcorrective actions required are on-going per a December 2018 agreement to extend the compliance date under the amended consent order. Theamended consent order also imposes stipulated penalties for exceedances of the facility's interim effluent discharge limits, which penalties we believemay, in the aggregate, reach or exceed $100,000.•During September 2010, our vinyls facilities in Lake Charles and Plaquemine each received a Consolidated Compliance Order and Notice of PotentialPenalty, alleging violations of various requirements of those facilities' air permits, based largely on self-reported permit deviations related to record-keeping violations. In May 2018, we reached an agreement in principal with the Louisiana Department of Environmental Quality to resolve theseconsolidated enforcement matters for a penalty of $162,500. The settlement agreement is subject to public comment and approval by the LouisianaAttorney General.•For several years, the EPA has been conducting an enforcement initiative against petroleum refineries and petrochemical plants with respect toemissions from flares. On April 21, 2014, we received a Clean Air Act Section 114 Information Request from the EPA which sought informationregarding flares at the Calvert City facility and certain Lake Charles facilities. The EPA has informed us that the information provided leads the EPAto believe that some of the flares are out of compliance with applicable standards. The EPA has indicated that it is seeking a consent decree that wouldobligate us to take corrective actions relating to the alleged noncompliance. We believe the resolution of these matters may require the payment of amonetary sanction in excess of $100,000.•Region Six of the EPA has investigated and inspected our compliance with Risk Management Program requirements under the Clean Air Act at ourGeismar facility. In November 2019, we reached an agreement in principle with the EPA to resolve this matter by consent agreement and final orderfor a penalty in the amount of $132,000, in addition to a supplemental environmental project with a cost to us of $116,200.•On November 15, 2019, the EPA issued a notice of violation and opportunity to show cause letter alleging violations of certain requirements underthe Toxic Substances Control Act identified during the agency's inspection of one of our Lake Charles facilities. We believe the resolution of thismatter may require payment of a monetary sanction in excess of $100,000.•On November 24, 2014, we entered into an agreed order with the Kentucky Energy and Environmental Cabinet ("KEEC") regarding our KentuckyPollutant Discharge Elimination System permit limits for hexachlorobenzene8Table of Contentsand mercury at our Calvert City, Kentucky facility. We and the KEEC entered into a new agreed order under which we will be subject to new interimdischarge limits for hexachlorobenzene in addition to accompanying stipulated penalties for exceedances of those interim discharge limits, whichpenalties we believe may, in the aggregate, reach or exceed $100,000.We do not believe that the resolution of any or all of these matters will have a material adverse effect on our financial condition, results of operations or cashflows.Also see our discussion of our environmental matters contained in Item 1A, "Risk Factors" below, Item 3, "Legal Proceedings" below and Note 22 to ourconsolidated financial statements included in Item 8 of this Form 10-K.EmployeesAs of December 31, 2019, we had approximately 9,430 employees in the following areas:Category NumberOlefins segment 840Vinyls segment 8,250Corporate and other 340Approximately 38% of our employees are represented by labor unions, and all of these union employees are working under collective bargaining agreementsthat expire at various times through 2024. We have multiple collective bargaining agreements in Europe, North America and Asia, covering different groups ofour work force. There were no strikes, lockouts or work stoppages in 2019, and we believe that our relationship with our employees and unions is open andpositive.TechnologyHistorically, our technology strategy has been to selectively acquire licenses from third-parties, as well as develop our own proprietary technology. Ourselection process incorporates many factors, including the cost of the technology, the ability to meet our customers' requirements, raw material and energyconsumption rates, product quality, capital costs, maintenance requirements and reliability. Most of the technology licensed from third-party providers is perpetualand has been paid in full. We own an intellectual property portfolio developed from focused research in both process and product technology. After acquiring ordeveloping a technology, we devote considerable effort to effectively employ the technology and further its development, with a focus towards continuousimprovement of our competitive positions.Conversely, we have selectively granted licenses to our patented Energx® technology for LLDPE production and for proprietary LDPE reactor mixingtechnology. We have also granted several licenses for EDC/VCM technology, including the direct chlorination process and catalyst, and S-PVC (Suspension PVCfor thermoplastic process) process and technology.Available InformationOur website address is www.westlake.com. Our website content is available for information purposes only. It should not be relied upon for investmentpurposes, nor is it incorporated by reference in this Form 10-K. We make available on this website under "Investor Relations/SEC Filings," free of charge, ourproxy statements, annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those materials as soon asreasonably practicable after we electronically file those materials with, or furnish those materials to, the SEC. The SEC also maintains a website at www.sec.govthat contains reports, proxy statements and other information regarding SEC registrants, including us.We intend to satisfy the requirement under Item 5.05 of Form 8-K to disclose any amendments to our Code of Ethics and any waiver from a provision of ourCode of Ethics by posting such information on our website at www.westlake.com under "Investor Relations/Corporate Governance."Item 1A. Risk FactorsCyclicality in the petrochemical industry has in the past, and may in the future, result in reduced operating margins or operating losses.Our historical operating results reflect the cyclical and volatile nature of the petrochemical industry. The industry is mature and capital intensive. Margins inthis industry are sensitive to supply and demand balances both domestically and internationally, which historically have been cyclical. The cycles are generallycharacterized by periods of tight supply, leading to high operating rates and margins, followed by periods of oversupply primarily resulting from excess newcapacity additions, leading to reduced operating rates and lower margins.9Table of ContentsMoreover, profitability in the petrochemical industry is affected by the worldwide level of demand along with vigorous price competition which mayintensify due to, among other things, new industry capacity. In general, weak economic conditions reduce demand and put pressure on margins. It is not possible topredict accurately the supply and demand balances, market conditions and other factors that will affect industry operating margins in the future.New capacity additions, principally of olefins in North America, Asia and the Middle East, a number of which have been recently completed, may lead toperiods of over-supply and lower profitability. As a result, our Olefins segment operating margins may be negatively impacted.We sell commodity products in highly competitive markets and face significant competition and price pressure.We sell our products in highly competitive markets. Due to the commodity nature of many of our products, competition in these markets is based primarilyon price and to a lesser extent on performance, product quality, product deliverability and customer service. As a result, we generally are not able to protect ourmarket position for these products by product differentiation and may not be able to pass on cost increases to our customers. Accordingly, increases in raw materialand other costs may not necessarily correlate with changes in prices for these products, either in the direction of the price change or in magnitude. Specifically,timing differences in pricing between raw material prices, which may change daily, and contract product prices, which in many cases are negotiated monthly orless often, sometimes with an additional lag in effective dates for increases, have had and may continue to have a negative effect on profitability. Significantvolatility in raw material costs tends to place pressure on product margins as sales price increases could lag behind raw material cost increases. Conversely, whenraw material costs decrease, customers could seek relief in the form of lower sales prices.Volatility in costs of raw materials and energy may result in increased operating expenses and adversely affect our results of operations and cash flows.Significant variations in the costs and availability of raw materials and energy may negatively affect our results of operations. These costs have risensignificantly in the past due primarily to oil and natural gas cost increases. We purchase significant amounts of ethane feedstock, natural gas, ethylene and salt toproduce several basic chemicals. We also purchase significant amounts of electricity to supply the energy required in our production processes. The cost of theseraw materials and energy, in the aggregate, represents a substantial portion of our operating expenses. The prices of raw materials and energy generally followprice trends of, and vary with market conditions for, crude oil and natural gas, which are highly volatile and cyclical. Changes to regulatory policies applicable tothe German energy sector for industrial users have contributed to higher prices for industrial users of energy in the past and may continue to do so in the future. Ourresults of operations have been and could in the future be significantly affected by increases in these costs.Price increases increase our working capital needs and, accordingly, can adversely affect our liquidity and cash flows. In addition, because we utilize thefirst-in, first-out ("FIFO") method of inventory accounting, during periods of falling raw material prices and declining sales prices, our results of operations for aparticular reporting period could be negatively impacted as the lower sales prices would be reflected in operating income more quickly than the correspondingdrop in feedstock costs. We use derivative instruments in an attempt to reduce price volatility risk on some feedstock commodities. In the future, we may decidenot to hedge any of our raw material costs or any hedges we enter into may not have successful results. Also, our hedging activities involve credit risk associatedwith our hedging counterparties, and a deterioration in the financial markets could adversely affect our hedging counterparties and their abilities to fulfill theirobligations to us.Lower prices of crude oil, such as those experienced from the third quarter of 2014 through 2019 (at December 31, 2019, approximately 43% lower thantheir 2014 peak levels), led to a reduction in the cost advantage for natural gas liquids-based ethylene crackers in North America, such as ours, as compared tonaphtha-based ethylene crackers. As a result, our margins and cash flows were negatively impacted. Lower crude oil and natural gas prices could lead to areduction in hydraulic fracturing in the United States, which could reduce the availability of feedstock and increase prices of feedstock for our operations. Highernatural gas prices could also adversely affect our ability to export products that we produce in the United States outside of the United States. In addition to theimpact that this has on our exports from the United States, reduced competitiveness of U.S. producers also has in the past increased the availability of chemicals inNorth America, as U.S. production that would otherwise have been sold overseas was instead offered for sale domestically, resulting in excess supply and lowerprices in North America. We could also face the threat of imported products from countries that have a cost advantage. Additionally, the export of natural gasliquids from the United States or greater restrictions on hydraulic fracturing could restrict the availability of our raw materials in the United States, therebyincreasing our costs.10Table of ContentsExternal factors beyond our control can cause fluctuations in demand for our products and in our prices and margins, which may negatively affect our resultsof operations and cash flows.External factors beyond our control can cause volatility in raw material prices, demand for our products, product prices and volumes and deterioration inoperating margins. These factors can also magnify the impact of economic cycles on our business and results of operations. Examples of external factors include:•general economic conditions, including in the United States, Europe andAsia;•new capacity additions in North America, Europe, Asia and the MiddleEast;•the level of business activity in the industries that use ourproducts;•competitoraction;•technologicalinnovations;•currency fluctuations;•increases in interest rates;•international events and circumstances;•pandemics and other public healththreats;•war, sabotage, terrorism and civilunrest;•governmental regulation, including in the United States, Europe andAsia;•public attitude towards climate change and safety, health and theenvironment;•perceptions of our products by potential buyers of our products, as well as the public generally, and related changes in behavior, including with respectto recycling;•severe weather and natural disasters;and•credit worthiness of customers andvendors.A number of our products are highly dependent on durable goods markets, such as housing and construction, which are themselves particularly cyclical.Weakness in the U.S. residential housing market and economic weakness in Europe could have an adverse effect on demand and margins for our products. If theglobal economy worsens in general, or the U.S. residential housing market or the European economy worsens in particular, demand for our products and our resultsof operations and cash flows could be adversely affected.We may reduce production at or idle a facility for an extended period of time or exit a business because of high raw material prices, an oversupply of aparticular product and/or a lack of demand for that particular product, which makes production uneconomical. Temporary outages sometimes last for severalquarters or, in certain cases, longer and cause us to incur costs, including the expenses of maintaining and restarting these facilities. Factors such as increases in rawmaterial costs or lower demand in the future may cause us to further reduce operating rates, idle facilities or exit uncompetitive businesses.Hostilities in the Middle East or elsewhere or the occurrence, or threat of occurrence, of terrorist attacks could adversely affect the economies of the UnitedStates, Europe and other developed countries. A lower level of economic activity could result in a decline in demand for our products, which could adversely affectour net sales and margins and limit our future growth prospects. Volatility in prices for crude oil and natural gas could also result in increased feedstock costs.Furthermore, sustained lower prices of crude oil, such as the prices experienced from the third quarter of 2014 through 2019, have led and may lead to lowermargins in the United States. In addition, these risks could cause increased instability in the financial and insurance markets and could adversely affect our abilityto access capital and to obtain insurance coverage that we consider adequate or is otherwise required by our contracts with third parties.11Table of ContentsWe operate internationally and are subject to related risks, including exchange rate fluctuations, exchange controls, political risk and other risks relating tointernational operations.We operate internationally and are subject to the risks of doing business on a global basis. These risks include, but are not limited to, fluctuations in currencyexchange rates, currency devaluations, imposition or the threat of trade barriers (which could, among other things, negatively impact our ability to export ourproducts outside of the U.S.), imposition or the threat of tariffs and duties (which could, among other things, lead to lower demand for our products outside of theU.S.), restrictions on the transfer of funds, changes in law and regulatory requirements, involvement in judicial proceedings in unfavorable jurisdictions, economicinstability and disruptions, political unrest and epidemics. U.S. foreign trade policies could lead to the imposition of additional trade barriers and tariffs on us inforeign jurisdictions. Our operating results could be negatively affected by any of these risks.Our inability to compete successfully may reduce our operating profits.The petrochemical industry is highly competitive. Historically, there have been a number of mergers, acquisitions, spin-offs and joint ventures in theindustry. This restructuring activity has resulted in fewer but more competitive producers, many of which are larger than we are and have greater financialresources than we do. Among our competitors are some of the world's largest chemical companies and chemical industry joint ventures. Competition within thepetrochemical industry and in the manufacturing of building products is affected by a variety of factors, including:•product price;•balance of product supply/demand;•material, technology and process innovation;•technical support and customerservice;•quality;•reliability of raw material and utilitysupply;•availability of potential substitute materials;and•product performance.Changes in the competitive environment could have a material adverse effect on our business and our operations. These changes could include:•the emergence of new domestic and internationalcompetitors;•the rate of capacity additions bycompetitors;•changes in customer base due tomergers;•the intensification of price competition in ourmarkets;•the introduction of new or substitute products by competitors; and•the technological innovations of competitors.Our production facilities process some volatile and hazardous materials that subject us to operating risks that could adversely affect our operating results.We have manufacturing sites in North America, Europe and Asia. Our operations are subject to the usual hazards associated with chemical, plastics andbuilding products manufacturing and the related use, storage, transportation and disposal of feedstocks, products and wastes, including:•pipeline leaks and ruptures;•explosions;•fires;•severe weather and naturaldisasters;•mechanical failure;•unscheduled downtime;•labor difficulties;•transportation interruptions;12Table of Contents•transportation accidents involving ourproducts;•remediation complications;•chemical spills, discharges or releases of toxic or hazardous substances or gases;•other environmental risks;•sabotage;•terrorist attacks; and•political unrest.According to some experts, global climate change could result in heightened hurricane activity in the Gulf of Mexico and other weather and natural disasterhazards worldwide. If this materializes, severe weather and natural disaster hazards could pose an even greater risk for our facilities, particularly those inLouisiana.All these hazards can cause personal injury and loss of life, catastrophic damage to or destruction of property and equipment and environmental damage, andmay result in a suspension of operations and the imposition of civil or criminal penalties. We could become subject to environmental claims brought bygovernmental entities or third parties. A loss or shutdown over an extended period of operations at any one of our chemical manufacturing facilities would have amaterial adverse effect on us. We maintain property, business interruption and casualty insurance that we believe is in accordance with customary industrypractices, but we cannot be fully insured against all potential hazards incident to our business, including losses resulting from war risks or terrorist acts. As a resultof market conditions, premiums and deductibles for certain insurance policies can increase substantially and, in some instances, certain insurance may becomeunavailable or available only for reduced amounts of coverage. If we were to incur a significant liability for which we were not fully insured, it could have amaterial adverse effect on our financial condition, results of operations or cash flows.We are exposed to significant losses from products liability, personal injury and other claims relating to the products we manufacture. Additionally,individuals currently seek, and likely will continue to seek, damages for alleged personal injury or property damage due to alleged exposure to chemicals at ourfacilities or to chemicals otherwise owned, controlled or manufactured by us. We are also subject to present and future claims with respect to workplace exposure,workers' compensation and other matters. Any such claims, whether with or without merit, could be time consuming, expensive to defend and could divertmanagement's attention and resources. We maintain and expect to continue to maintain insurance for products liability, workplace exposure, workers'compensation and other claims, but the amount and scope of such insurance may not be adequate or available to cover a claim that is successfully asserted againstus. In addition, such insurance could become more expensive and difficult to maintain and may not be available to us on commercially reasonable terms or at all.The results of any future litigation or claims are inherently unpredictable, but such outcomes could have a material adverse effect on our financial condition, resultsof operations or cash flows.We rely on a limited number of outside suppliers for specified feedstocks and services.We obtain a significant portion of our raw materials from a few key suppliers. If any of these suppliers is unable to meet its obligations under any present orfuture supply agreements, we may be forced to pay higher prices to obtain the necessary raw materials. Any interruption of supply or any price increase of rawmaterials could have a material adverse effect on our business and results of operations. A vendor may choose, subject to existing contracts, to modify itsrelationship due to general economic concerns or concerns relating to the vendor or us, at any time. Any significant change in the terms that we have with our keysuppliers, or any significant additional requirements from our suppliers that we provide them additional security in the form of prepayments or with letters ofcredits, could materially adversely affect our financial condition, results of operations or cash flows.13Table of ContentsWe rely heavily on third party transportation, which subjects us to risks and costs that we cannot control. Such risks and costs may materially adversely affectour operations.We rely heavily on railroads, barges, pipelines, ships, trucks and other shipping companies to transport raw materials to the manufacturing facilities used byour businesses and to ship finished products to customers. These transport operations are subject to various hazards and risks, including extreme weatherconditions, work stoppages and operating hazards (including pipeline leaks and ruptures and storage tank leaks), as well as interstate transportation regulations. Inaddition, the methods of transportation we utilize, including shipping chlorine and other chemicals by railroad, may be subject to additional, more stringent andmore costly regulations in the future. If we are delayed or unable to ship finished products or unable to obtain raw materials as a result of any such new regulationsor public policy changes related to transportation safety, or these transportation companies fail to operate properly, or if there were significant changes in the costof these services due to new or additional regulations, or otherwise, we may not be able to arrange efficient alternatives and timely means to obtain raw materialsor ship goods, which could result in a material adverse effect on our business and results of operations.We may pursue acquisitions, dispositions and joint ventures and/or other transactions that may impact our results of operations and financial condition.We seek opportunities to maximize efficiency and create stockholder value through various transactions. These transactions may include domestic andinternational business combinations, purchases or sales of assets or contractual arrangements or joint ventures that are intended to result in the realization ofsynergies, the creation of efficiencies or the generation of cash to reduce debt. In this regard, we regularly consider acquisition opportunities that would beconsistent or complementary to our existing business strategies. To the extent permitted under our credit facility, the indenture governing our senior notes andother debt agreements, some of these transactions may be financed by additional borrowings by us. Although we would pursue these transactions because weexpect them to yield longer-term benefits if the efficiencies and synergies we expect are realized, they could adversely affect our results of operations in the shortterm because of the costs associated with such transactions and because they may divert management's attention from existing business operations. Othertransactions may advance future cash flows from some of our businesses, thereby yielding increased short-term liquidity, but consequently resulting in lower cashflows from these operations over the longer term. These transactions may not yield the business benefits, synergies or financial benefits anticipated bymanagement. Integration of other acquired operations can lead to restructuring charges or other costs. We may have difficulties integrating the operations of otheracquired businesses.Our operations and assets are subject to extensive environmental, health and safety laws and regulations.We use large quantities of hazardous substances and generate hazardous wastes and emissions in our manufacturing operations. Due to the associatedquantities of hazardous substances and wastes, our industry is highly regulated and monitored by various environmental regulatory authorities such as the EPA,federal or state analogs in other countries and the European Union, which promulgated the Industrial Emission Directive ("IED"). As such, we are subject toextensive international, national, state and local laws, regulations and directives pertaining to pollution and protection of the environment, health and safety, whichgovern, among other things, emissions to the air, discharges onto land or waters, the maintenance of safe conditions in the workplace, the remediation ofcontaminated sites, and the generation, handling, storage, transportation, treatment and disposal of waste materials. Some of these laws, regulations and directivesare subject to varying and conflicting interpretations. Many of these laws, regulations and directives provide for substantial fines and potential criminal sanctionsfor violations and require the installation of costly pollution control equipment or operational changes to limit pollution emissions or reduce the likelihood orimpact of hazardous substance releases, whether permitted or not. For example, all of our petrochemical facilities in the United States and Europe may requireimprovements to comply with certain changes in process safety management requirements.New laws, rules and regulations as well as changes to laws, rules and regulations may also affect us. For example, on April 17, 2012, the EPA promulgatedmaximum achievable control technology ("MACT") standards for major sources and generally available control technology ("GACT") standards for area sourcesof PVC production. The rule sets emission limits and work practice standards for total organic air toxics and for three specific air toxics: vinyl chloride, chlorinateddi-benzo dioxins and furans ("CD/DF") and hydrogen chloride and includes requirements to demonstrate initial and continuous compliance with the emissionstandards. While this rule is the subject of legal challenge and EPA reconsideration, the rule has not been stayed.In March 2011, the EPA proposed amendments to the emission standards for hazardous air pollutants for mercury emissions from mercury cell chlor-alkaliplants. These proposed amendments would require improvements in work practices to reduce fugitive mercury emissions. We operate a mercury cell productionunit at our Natrium facility. We cannot predict the timing or content of the final regulation, or its ultimate cost to, or impact on us.14Table of ContentsOur operations produce greenhouse gas ("GHG") emissions, which have been the subject of increased scrutiny and regulation. In December 2015, the UnitedStates joined the international community at the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change in Paris, France.The resulting Paris Agreement calls for the parties to undertake "ambitious efforts" to limit the average global temperature and to conserve and enhance sinks andreservoirs of greenhouse gases. The United States signed the Paris Agreement in April 2016, and the Paris Agreement went into effect in November 2016.However, in November 2019, the United States submitted formal notification to the United Nations that it intends to withdraw from the Paris Agreement. Pursuantto the terms of the Paris Agreement, the withdrawal will take effect in November 2020. Legislation to regulate GHG emissions has also been introduced in theUnited States Congress, and there has been a wide-ranging policy debate regarding the impact of these gases and possible means for their regulation. Some of theproposals would require industries to meet stringent new standards that would require substantial reductions in carbon emissions. Those reductions could be costlyand difficult to implement.Various jurisdictions have considered or adopted laws and regulations on GHG emissions, with the general aim of reducing such emissions. The EPAcurrently requires certain industrial facilities to report their GHG emissions, and to obtain permits with stringent control requirements before constructing ormodifying new facilities with significant GHG emissions. In the European Union, the Emissions Trading Scheme obligates certain emitters to obtain GHGemission allowances to comply with a cap and trade system for GHG emissions. In addition, the European Union has committed to reduce domestic GHGemissions by at least 40% below the 1990 level by 2030. As our chemical manufacturing processes result in GHG emissions, these and other GHG laws andregulations could affect our costs of doing business.Similarly, the Toxic Substances Control Act ("TSCA") imposes reporting, record-keeping and testing requirements, and restrictions relating to theproduction, handling, and use of chemical substances. The TSCA reform legislation enacted in June 2016 expanded the EPA's authority to review and regulate newand existing chemicals. Under the reform legislation, the EPA is required to, among other things, undertake rule making within statutory time frames related to: (1)chemical risk evaluation, designation and management; (2) reporting of mercury supply, use and trade; and (3) management of persistent, bioaccumulative, andtoxic chemical substances ("PBTs"). In response to this mandate, the EPA issued rules establishing the EPA's process and criteria for identifying high prioritychemicals for risk evaluation and setting the EPA's approach for determining whether these high priority chemicals present an unreasonable risk to health or theenvironment. In December 2019, the EPA designated certain chemical substances as high priority for risk evaluation. We manufacture several of these chemicalsubstances. Although we cannot predict with certainty the extent of our future liabilities and costs at this time, we do not anticipate that the evaluation of thesechemical substances will have a material adverse effect on our business, financial condition, operating results or cash flows. In addition, the TSCA inventory resetrule required industry reporting of chemicals manufactured or processed in the United States over the past 10 years, from which the EPA will determine whichsubstances are active or inactive on the existing inventory. Beginning in August 2019, manufacturers and processors are required to notify the EPA beforereintroducing into commerce a substance currently identified as "inactive" on the TSCA inventory. A final mercury reporting rule published in June 2018 requiresmanufacturers, including manufacturers who intentionally use mercury in a manufacturing process, to report information about their mercury supply, use andtrade. The first periodic report under the new mercury reporting rule was due July 1, 2019. The EPA will use the information collected to develop an inventory ofmercury and mercury-added products as well as mercury-use manufacturing processes. The EPA may then recommend actions or promulgate further rules aimedat reducing mercury use. We cannot predict the timing or content of these actions or rules, or their ultimate cost to, or impact on us.Under the IED, European Union member state governments are expected to adopt rules and implement environmental permitting programs relating to air,water and waste for industrial facilities. In this context, concepts such as the "best available technique" are being explored. Future implementation of theseconcepts may result in technical modifications in our European facilities. In addition, under the Environmental Liability Directive, European Union member statescan require the remediation of soil and groundwater contamination in certain circumstances, under the "polluter pays principle." We are unable to predict theimpact these requirements and concepts may have on our future costs of compliance.These rules or future new, amended or proposed laws or rules could increase our costs or reduce our production, which could have a material adverse effecton our business, financial condition, operating results or cash flows. In addition, we cannot accurately predict future developments, such as increasingly strictenvironmental and safety laws or regulations, and inspection and enforcement policies, as well as resulting higher compliance costs, which might affect thehandling, manufacture, use, emission, disposal or remediation of products, other materials or hazardous and non-hazardous waste, and we cannot predict withcertainty the extent of our future liabilities and costs under environmental, health and safety laws and regulations. These liabilities and costs may be material.15Table of ContentsWe also may face liability for alleged personal injury or property damage due to exposure to chemicals or other hazardous substances at our facilities or tochemicals that we otherwise manufacture, handle or own. Although these types of claims have not historically had a material impact on our operations, asignificant increase in the success of these types of claims could have a material adverse effect on our business, financial condition, operating results or cash flows.Environmental laws may have a significant effect on the nature and scope of, and responsibility for, cleanup of contamination at our current and formeroperating facilities, the costs of transportation and storage of raw materials and finished products, the costs of reducing emissions and the costs of the storage anddisposal of wastewater. The U.S. Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA"), similar state laws and certain Europeandirectives impose joint and several liability for the costs of remedial investigations and actions on the entities that generated waste, arranged for disposal of thewastes, transported to or selected the disposal sites and the past and present owners and operators of such sites. All such potentially responsible parties (or any oneof them, including us) may be required to bear all of such costs regardless of fault, legality of the original disposal or ownership of the disposal site. In addition,CERCLA, similar state laws and certain European directives could impose liability for damages to natural resources caused by contamination.Although we seek to take preventive action, our operations are inherently subject to accidental spills, discharges or other releases of hazardous substancesthat may make us liable to governmental entities or private parties. This may involve contamination associated with our current and former facilities, facilities towhich we sent wastes or by-products for treatment or disposal and other contamination. Accidental discharges may occur in the future, future action may be takenin connection with past discharges, governmental agencies may assess damages or penalties against us in connection with any past or future contamination, or thirdparties may assert claims against us for damages allegedly arising out of any past or future contamination. In addition, we may be liable for existing contaminationrelated to certain of our facilities for which, in some cases, we believe third parties are liable in the event such third parties fail to perform their obligations.Capital projects are subject to risks, including delays and cost overruns, which could have an adverse impact on our financial condition and results ofoperations.We have capital expansion plans for our facilities. Expansion projects may be subject to delays or cost overruns, including delays or cost overruns resultingfrom any one or more of the following:•unexpectedly long delivery times for, or shortages of, key equipment, parts ormaterials;•shortages of skilled labor and other personnel necessary to perform thework;•delays and performance issues;•failures or delays of third-party equipment vendors or service providers;•unforeseen increases in the cost of equipment, labor and rawmaterials;•work stoppages and other labor disputes;•unanticipated actual or purported change orders;•disputes with contractors and suppliers;•design and engineeringproblems;•latent damages or deterioration to equipment and machinery in excess of engineering estimates andassumptions;•financial or other difficulties of our contractors andsuppliers;•sabotage;•terrorist attacks;•interference from adverse weather conditions;and•difficulties in obtaining necessary permits or in meeting permitconditions.Significant cost overruns or delays could materially affect our financial condition and results of operations. Additionally, actual capital expenditures couldmaterially exceed our planned capital expenditures.16Table of ContentsOur level of debt could adversely affect our ability to operate our business.As of December 31, 2019, our indebtedness, including the current portion, totaled $3.4 billion, and our debt represented approximately 35% of our totalcapitalization. Our annual interest expense for 2019 was $124 million, net of interest capitalized of $9 million. Our level of debt and the limitations imposed on usby our existing or future debt agreements could have significant consequences on our business and future prospects, including the following:•a portion of our cash flows from operations will be dedicated to the payment of interest and principal on our debt and will not be available for otherpurposes;•we may not be able to obtain necessary financing in the future for working capital, capital expenditures, acquisitions, debt service requirements orother purposes;•our less leveraged competitors could have a competitive advantage because they have greater flexibility to utilize their cash flows to improve theiroperations;•we may be exposed to risks inherent in interest rate fluctuations because some of our borrowings are at variable rates of interest, which would result inhigher interest expense in the event of increases in interest rates;•we could be vulnerable in the event of a downturn in our business that would leave us less able to take advantage of significant business opportunitiesand to react to changes in our business and in market or industry conditions; and•should we pursue additional expansions of existing assets or acquisition of third party assets, we may not be able to obtain additional liquidity at costeffective interest rates.These factors could be magnified or accelerated to the extent we were to finance future acquisitions with significant amounts of debt.To service our indebtedness and fund our capital requirements, we will require a significant amount of cash. Our ability to generate cash depends on manyfactors beyond our control.Our ability to make payments on and to refinance our indebtedness and to fund planned capital expenditures and pay cash dividends will depend on ourability to generate cash in the future, including any distributions that we may receive from Westlake Partners. This is subject to general economic, financial,currency, competitive, legislative, regulatory and other factors that are beyond our control.Our business may not generate sufficient cash flows from operations, we may not receive sufficient distributions from Westlake Partners, and currentlyanticipated cost savings and operating improvements may not be realized on schedule. We also generate revenues denominated in currencies other than that of ourindebtedness and may have difficulty converting those revenues into the currency of our indebtedness. We may need to refinance all or a portion of ourindebtedness on or before maturity. In addition, we may not be able to refinance any of our indebtedness, including our credit facility and our senior notes, oncommercially reasonable terms or at all. All of these factors could be magnified if we were to finance any future acquisitions with significant amounts of debt.The Credit Agreement and the indenture governing certain of our senior notes impose significant operating and financial restrictions, which may prevent usfrom capitalizing on business opportunities and taking some actions.The Credit Agreement and the indenture governing certain of our senior notes impose significant operating and financial restrictions on us. These restrictionslimit our ability to:•pay dividends on, redeem or repurchase our capitalstock;•make investments and other restrictedpayments;•incur additional indebtedness or issue preferred stock;•create liens;•permit dividend or other payment restrictions on our restrictedsubsidiaries;•sell all or substantially all of our assets or consolidate or merge with or into othercompanies;•engage in transactions with affiliates; and•engage in sale-leasebacktransactions.17Table of ContentsThese limitations are subject to a number of important qualifications and exceptions. Currently, many of these restrictions in the indenture governing certainof our senior notes are suspended under the indenture because those notes are currently rated investment grade by at least two nationally recognized credit ratingagencies. The Credit Agreement also requires us to maintain a quarterly total leverage ratio.These covenants may adversely affect our ability to finance future business opportunities or acquisitions. A breach of any of these covenants could result in adefault in respect of the related debt. If a default occurred, the relevant lenders could elect to declare the debt, together with accrued interest and other fees, to beimmediately due and payable. In addition, any acceleration of debt under the Credit Agreement will constitute a default under some of our other debt, including theindentures governing our senior notes.Our participation in joint ventures and similar arrangements exposes us to a number of risks, including risks of shared control.We are party to several joint ventures and similar arrangements, including an investment, together with Lotte Chemical USA Corporation ("Lotte"), in a jointventure, LACC, LLC ("LACC"), to build and operate an ethylene facility. Our participation in joint ventures and similar arrangements, by their nature, requires usto share control with unaffiliated third parties. In particular, with respect to our investment in LACC, we are a 46.8% holder and, therefore, our partner Lotte hasprimary control over operations and was primarily responsible for the management of the contractors during construction of the ethylene facility. If there aredifferences in views among joint venture participants in how to operate a joint venture that result in delayed decisions or the failure to make decisions, or our jointventure partners do not fulfill their obligations, the affected joint venture may not be able to operate according to its business plan and fulfill its obligations. In thatcase, we may be required to write down the value of our investment in a joint venture, increase the level of financial or other commitments to the joint venture or,if we have contractual agreements with the joint venture, our operations may be materially adversely affected. Any of the foregoing could have a material adverseeffect on our financial condition, results of operations or cash flows.Regulations concerning the transportation of hazardous chemicals and the security of chemical manufacturing facilities could result in higher operatingcosts.Targets such as chemical manufacturing facilities may be at greater risk of terrorist attacks than other targets. As a result, the chemical industry responded tothe issues surrounding the terrorist attacks of September 11, 2001 by implementing initiatives relating to the security of chemicals industry facilities and thetransportation of hazardous chemicals. Simultaneously, local, state, national and international governments put into effect a regulatory process that led to newregulations impacting the security of chemical plant locations and the transportation of hazardous chemicals. Our business or our customers' businesses could beadversely affected because of the cost of complying with these regulations.A change in tax laws, treaties or regulations, or their interpretation or application, could have a negative impact on our business and results of operations.We are subject to changes in applicable tax laws, treaties or regulations in the jurisdictions in which we operate. A material change in these tax laws, treatiesor regulations, or their interpretation or application, could have a negative impact on our business and results of operations.We may have difficulties integrating the operations of future acquired businesses.If we are unable to integrate or to successfully manage businesses that we may acquire in the future, our business, financial condition and results ofoperations could be adversely affected. We may not be able to realize the operating efficiencies, synergies, cost savings or other benefits expected fromacquisitions for a number of reasons, including the following:•we may fail to integrate the businesses we acquire into a cohesive, efficiententerprise;•our resources, including management resources, are limited and may be strained if we engage in a large acquisition or significant number ofacquisitions, and acquisitions may divert our management's attention from initiating or carrying out programs to save costs or enhance revenues; and•our failure to retain key employees and contracts of the businesses weacquire.Future acquisitions could lead to significant restructuring or other changes.18Table of ContentsRegulations related to "conflict minerals" could adversely impact our business.The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 ("Dodd-Frank Act") contains provisions to improve transparency andaccountability concerning the supply of certain minerals, known as conflict minerals, originating from the Democratic Republic of Congo and adjoining countries(collectively, the "Covered Countries"). The term "conflict minerals" encompasses tantalum, tin, tungsten (and their ores) and gold.In August 2012, pursuant to the Dodd-Frank Act, the SEC adopted annual disclosure and reporting requirements applicable to any company that filesperiodic public reports with the SEC, if any conflicts minerals are necessary to the functionality or production of a product manufactured, or contracted to bemanufactured, by that company. These annual reporting requirements require companies to describe reasonable country of origin inquiries, due diligence measuresand the results of those activities and related determinations.Because we have a highly complex, multi-layered supply chain, we may incur significant costs to comply with these requirements. In addition, theimplementation of procedures to comply with these requirements could adversely affect the sourcing, supply and pricing of materials, including components, usedin our products. Our suppliers (or suppliers to our suppliers) may not be able or willing to provide all requested information or to take other steps necessary toensure that no conflict minerals financing or benefiting armed groups are included in materials or components supplied to us for our manufacturing purposes. Also,we may encounter challenges to satisfy customers that may require all of the components of products purchased by them to be certified as conflict free. If we arenot able to meet customer certification requirements, customers may choose to disqualify us as a supplier. In addition, since the applicability of the new conflictminerals requirements is limited to companies that file periodic reports with the SEC, not all of our competitors will need to comply with these requirements unlessthey are imposed by customers. As a result, those competitors may have cost and other advantages over us.Our operations could be adversely affected by labor relations.The vast majority of our employees in Europe and Asia, and some of our employees in North America, are represented by labor unions and works councils.Our operations may be adversely affected by strikes, work stoppages and other labor disputes.We have certain material pension and other post-retirement employment benefit ("OPEB") obligations. Future funding obligations related to these obligationscould restrict cash available for our operations, capital expenditures or other requirements or require us to borrow additional funds.We have U.S. and non-U.S. defined benefit pension plans covering certain current and former employees. Certain non-U.S. defined benefit plans associatedwith our European operations have not been funded and we are not obligated to fund those plans under applicable law. As of December 31, 2019, the projectedbenefit obligations for our pension and OPEB plans were $847 million and $69 million, respectively. The fair value of pension investment assets was $545 millionas of December 31, 2019. The total underfunded status of the pension obligations calculated on a projected benefit obligation basis as of December 31, 2019 was$302 million, including the Westlake Defined Benefit Plan, which was underfunded by $148 million on an individual plan basis.The unfunded OPEB obligations as of December 31, 2019 were $69 million. We will require future operating cash flows to fund our pension and OPEBobligations, which could restrict available cash for our operations, capital expenditures and other requirements. We may also not generate sufficient cash to satisfythese obligations, which could require us to seek funding from other sources, including through additional borrowings, which could materially increase ouroutstanding debt or debt service requirements.19Table of ContentsIf our goodwill, indefinite-lived intangible assets or other intangible assets become impaired in the future, we may be required to record non-cash charges toearnings, which could be significant.Under GAAP, we review goodwill and indefinite-lived intangible assets for impairment on an annual basis or more frequently if events or circumstancesindicate that their carrying value may not be recoverable. Other intangible assets are reviewed if events or circumstances indicate that their carrying value may notbe recoverable. The process of impairment testing for our goodwill and intangible assets involves a number of judgments and estimates made by managementincluding the fair values of assets and liabilities, future cash flows, our interpretation of current economic indicators and market conditions, overall economicconditions and our strategic operational plans with regards to our business units. If the judgments and estimates used in our analysis are not realized or change dueto external factors, then actual results may not be consistent with these judgments and estimates, and our goodwill and intangible assets may become impaired infuture periods. If our goodwill, indefinite-lived intangible assets or other intangible assets are determined to be impaired in the future, we may be required torecord non-cash charges to earnings during the period in which the impairment is determined, which could be significant and have an adverse effect on ourfinancial condition and results of operations.Failure to adequately protect critical data and technology systems could materially affect our operations.Information technology system failures, network disruptions and breaches of data security due to internal or external factors including cyber-attacks coulddisrupt our operations by causing delays or cancellation of customer orders, impede the manufacture or shipment of products or cause standard business processesto become ineffective, resulting in the unintentional disclosure of information or damage to our reputation. While we have taken steps to address these concerns byimplementing network security and internal control measures, including employee training, comprehensive monitoring of our networks and systems, maintenanceof backup and protective systems and disaster recovery and incident response plans, our employees, systems, networks, products, facilities and services remainpotentially vulnerable to sophisticated cyber-assault, and, as such, there can be no assurance that a system failure, network disruption or data security breach willnot have a material adverse effect on our business, financial condition, operating results or cash flows.Fluctuations in foreign currency exchange and interest rates could affect our consolidated financial results.We earn revenues, pay expenses, own assets and incur liabilities in countries using currencies other than the U.S. dollar. Because our consolidated financialstatements are presented in U.S. dollars, we must translate revenues and expenses into U.S. dollars at the average exchange rate during each reporting period, aswell as assets and liabilities into U.S. dollars at exchange rates in effect at the end of each reporting period. Therefore, increases or decreases in the value of theU.S. dollar against other major currencies will affect our net sales, operating income and the value of balance sheet items denominated in foreign currencies.Because of the geographic diversity of our operations, weaknesses in various currencies might occur in one or many of such currencies over time. From time totime, we may use derivative financial instruments to further reduce our net exposure to currency exchange rate fluctuations. However, fluctuations in foreigncurrency exchange rates, such as the strengthening of the U.S. dollar against major currencies, including, in particular, the Euro and the Canadian dollar, couldnevertheless materially adversely affect our financial results.In addition, we are exposed to volatility in interest rates. When appropriate, we may use derivative financial instruments to reduce our exposure to interestrate risks. However, our financial risk management program may not be successful in reducing the risks inherent in exposures to interest rate fluctuations.20Table of ContentsOur property insurance has only partial coverage for acts of terrorism and, in the event of terrorist attack, we could lose net sales and our facilities.As a result of the terrorist attacks of September 11, 2001 and other events, our insurance carriers created certain exclusions for losses from terrorism fromour property insurance policies. While separate terrorism insurance coverage is available, premiums for full coverage are very expensive, especially for chemicalfacilities, and the policies are subject to high deductibles. Available terrorism coverage typically excludes coverage for losses from acts of war and from acts offoreign governments as well as nuclear, biological and chemical attacks. We have determined that it is not economically prudent to obtain full terrorism insurance,especially given the significant risks that are not covered by such insurance. Where feasible we have secured some limited terrorism insurance coverage on ourproperty where insurers have included it in their overall programs. In the event of a terrorist attack impacting one or more of our facilities, we could lose the netsales from the facilities and the facilities themselves, and could become liable for any contamination or for personal or property damage due to exposure tohazardous materials caused by any catastrophic release that may result from a terrorist attack.Westlake Partners' tax treatment depends on its status as a partnership for federal income tax purposes, and it not being subject to a material amount of entity-level taxation. We depend in part on distributions from Westlake Partners to generate cash for our operations, capital expenditures, debt service and otheruses. If the Internal Revenue Service ("IRS") were to treat Westlake Partners as a corporation for federal income tax purposes, or if Westlake Partnersbecame subject to entity-level taxation for state tax purposes, its cash available for distribution would be substantially reduced, which would also likely cause asubstantial reduction in the value of its common units that we hold.The anticipated after-tax economic benefit of an investment in the common units of Westlake Partners depends largely on Westlake Partners being treated asa partnership for U.S. federal income tax purposes. Despite the fact that Westlake Partners is organized as a limited partnership under Delaware law, it would betreated as a corporation for U.S. federal income tax purposes unless it satisfies a "qualifying income" requirement (the "Qualifying Income Exception") underSection 7704 of the Internal Revenue Code of 1986, as amended (the "Code"). Failure to meet the Qualifying Income Exception would cause Westlake Partners tobe treated as a corporation for U.S. federal income tax purposes.Prior to its initial public offering, Westlake Partners requested and obtained a favorable private letter ruling from the IRS to the effect that, based on factspresented in the private letter ruling request, income from the production, transportation, storage and marketing of ethylene and its co-products constitutes"qualifying income" within the meaning of Section 7704 of the Code. However, no ruling has been or will be required regarding Westlake Partners' treatment as apartnership for U.S. federal income tax purposes. Failure to meet the Qualifying Income Exception or a change in current law could cause Westlake Partners to betreated as a corporation for U.S. federal income tax purposes or otherwise subject Westlake Partners to taxation as an entity.We will be controlled by our principal stockholder and its affiliates as long as they own a majority of our common stock, and our other stockholders will beunable to affect the outcome of stockholder voting during that time. Our interests may conflict with those of the principal stockholder and its affiliates, and wemay not be able to resolve these conflicts on terms possible in arms-length transactions.As long as TTWF LP (the "principal stockholder") and its affiliates (the "principal stockholder affiliates") own a majority of our outstanding common stock,they will be able to exert significant control over us, and our other stockholders, by themselves, will not be able to affect the outcome of any stockholder vote. As aresult, the principal stockholder, subject to any fiduciary duty owed to our minority stockholders under Delaware law, will be able to control all matters affecting us(some of which may present conflicts of interest), including:•the composition of our Board of Directors and, through the Board, any determination with respect to our business direction and policies, including theappointment and removal of officers and the determination of compensation;•any determinations with respect to mergers or other business combinations or the acquisition or disposition of assets;•our financing decisions, capital raising activities and the payment of dividends;and•amendments to our amended and restated certificate of incorporation or amended and restatedbylaws.The principal stockholder will be permitted to transfer a controlling interest in us without being required to offer our other stockholders the ability toparticipate or realize a premium for their shares of common stock. A sale of a controlling interest to a third party may adversely affect the market price of ourcommon stock and our business and results of operations because the change in control may result in a change of management decisions and business policy.Because we have elected not to be subject to Section 203 of the General Corporation Law of the State of Delaware, the principal stockholder may find it easier tosell its controlling interest to a third party than if we had not so elected.21Table of ContentsIn addition to any conflicts of interest that arise in the foregoing areas, our interests may conflict with those of the principal stockholder affiliates in anumber of other areas, including:•business opportunities that may be presented to the principal stockholder affiliates and to our officers and directors associated with the principalstockholder affiliates, and competition between the principal stockholder affiliates and us within the same lines of business;•the solicitation and hiring of employees from each other;and•agreements with the principal stockholder affiliates relating to corporate services that may be material to ourbusiness.We may not be able to resolve any potential conflicts with the principal stockholder affiliates, and even if we do, the resolution may be less favorable than ifwe were dealing with an unaffiliated party, particularly if the conflicts are resolved while we are controlled by the principal stockholder affiliates. Our amended andrestated certificate of incorporation provides that the principal stockholder affiliates have no duty to refrain from engaging in activities or lines of business similarto ours and that the principal stockholder affiliates will not be liable to us or our stockholders for failing to present specified corporate opportunities to us.Item 1B. Unresolved Staff CommentsNone.Item 2. PropertiesInformation concerning the principal locations from which our products are manufactured are included in the tables set forth under the captions "OlefinsBusiness—Products" and "Vinyls Business—Products" contained in Item 1-"Business."HeadquartersOur principal executive offices are located in Houston, Texas. Some of our office space is leased, at market rates, from an affiliate of our principalstockholder. See Note 20 to the consolidated financial statements appearing elsewhere in this Form 10-K and "Certain Relationships and Related Transactions" inour proxy statement to be filed with the SEC pursuant to Regulation 14A with respect to our 2020 annual meeting of stockholders (the "Proxy Statement").Item 3. Legal ProceedingsIn addition to the matters described under Item 1. Business—Environmental and Note 22 to our consolidated financial statements included in Item 8 of thisForm 10-K, we are involved in various legal proceedings incidental to the conduct of our business. We do not believe that any of these legal proceedings will havea material adverse effect on our financial condition, results of operations or cash flows.Item 4. Mine Safety DisclosureNot Applicable.Information about our Executive OfficersJames Chao (age 72). Mr. Chao has been our Chairman of the Board of Directors since July 2004 and became a director in June 2003. From May 1996 toJuly 2004, he served as our Vice Chairman. Mr. Chao has over 45 years of global experience in the chemical industry. In addition, Mr. Chao has been theChairman of the Board of Westlake Partners' general partner since its formation in March 2014. From June 2003 until November 2010, Mr. Chao was theexecutive chairman of Titan Chemicals Corp. Bhd. He has served as a Special Assistant to the Chairman of China General Plastics Group and worked in variousfinancial, managerial and technical positions at Mattel Incorporated, Developmental Bank of Singapore, Singapore Gulf Plastics Pte. Ltd. and Gulf OilCorporation. Mr. Chao, along with his brother Albert Chao, assisted their father T.T. Chao in founding Westlake Chemical Corporation. Mr. Chao received hisB.S. degree from Massachusetts Institute of Technology and an M.B.A. from Columbia University.22Table of ContentsAlbert Chao (age 70). Mr. Chao has been our President since May 1996 and a director since June 2003. Mr. Chao became our Chief Executive Officer inJuly 2004. Mr. Chao has over 40 years of global experience in the chemical industry. In 1985, Mr. Chao assisted his father T.T. Chao and his brother James Chaoin founding Westlake Chemical Corporation, where he served as Executive Vice President until he succeeded James Chao as President. In addition, Mr. Chao hasbeen the President, Chief Executive Officer and a director of Westlake Partners' general partner since its formation in March 2014. He has held positions in theController's Group of Mobil Oil Corporation, in the Technical Department of Hercules Incorporated, in the Plastics Group of Gulf Oil Corporation and has servedas Assistant to the Chairman of China General Plastics Group and Deputy Managing Director of a plastics fabrication business in Singapore. Mr. Chao is a trusteeof Rice University. Mr. Chao received a bachelor's degree from Brandeis University and an M.B.A. from Columbia University.M. Steven Bender (age 63). Mr. Bender has been our Executive Vice President and Chief Financial Officer since July 2017. From February 2008 to July2017, Mr. Bender served as our Senior Vice President and Chief Financial Officer. In addition, Mr. Bender served as our Treasurer from July 2011 to April 2017,a position he also held from February 2008 until December 2010. From February 2007 to February 2008, Mr. Bender served as our Vice President, Chief FinancialOfficer and Treasurer and from June 2005 to February 2007, he served as our Vice President and Treasurer. In addition, Mr. Bender has been the Senior VicePresident, Chief Financial Officer and a director of Westlake Partners' general partner since its formation in March 2014, and its Treasurer since April 2015. Priorto joining Westlake, from June 2002 until June 2005, Mr. Bender served as Vice President and Treasurer of KBR, Inc., and from 1996 to 2002 he held the positionof Assistant Treasurer for Halliburton Company. Prior to that, he held various financial positions within that company. Additionally, he was employed by TexasEastern Corporation for over a decade in a variety of increasingly responsible audit, finance and treasury positions. Mr. Bender received a Bachelor of BusinessAdministration from Texas A&M University and an M.B.A. from Southern Methodist University. Mr. Bender is also a Certified Public Accountant.Robert F. Buesinger (age 63). Mr. Buesinger has been our Executive Vice President, Vinyl Products since July 2017. From April 2010 to July 2017, Mr.Buesinger served as our Senior Vice President, Vinyls. Prior to joining us, Mr. Buesinger served as the General Manager and President of Chevron PhillipsChemical Company L.P.'s Performance Pipe Division from February 2010 to March 2010. From June 2008 to January 2010, Mr. Buesinger held the position ofGeneral Manager in the Alpha Olefins and Poly Alpha Olefins business of Chevron Phillips Chemical Company L.P. From April 2005 to May 2008, he served asthe President and Managing Director of Chevron Phillips Singapore Chemicals Pte. Ltd. and Asia Region General Manager for Chevron Phillips ChemicalCompany L.P. Prior to that, he held various technical and sales management positions within that company. Mr. Buesinger holds a B.S. in Chemical Engineeringfrom Tulane University.Roger L. Kearns (age 56). Mr. Kearns has been our Executive Vice President, Vinyls Chemicals since April 2018. Prior to joining Westlake, from 2008 toApril 2018, he was a member of the Executive Committee at Solvay S.A. in Belgium. From 2013 to 2018, he had responsibility for Solvay's advanced materialsbusiness cluster, as well as its corporate research organization and its North America region. From 2008 to 2012 he was responsible for overseeing Solvay's Asia-Pacific businesses, including its vinyls operations in the region. Prior to that, from 2004 through 2007, he was President of Solvay Advanced Polymers in theUnited States and earlier, from 2001 through 2003, he led Solvay's performance compounds business unit. Since beginning his career with Solvay in 1986, he hasheld a series of manufacturing, technical, corporate development, marketing and business management positions in the United States, Europe and Asia. Mr. Kearnsholds a bachelor's degree in Chemical Engineering from the Georgia Institute of Technology and an MBA from Stanford University.Lawrence E. (Skip) Teel (age 61). Mr. Teel has been our Executive Vice President, Olefins since July 2017. From July 2014 to July 2017, Mr. Teel served asour Senior Vice President, Olefins and, from July 2012 to July 2014, he served as our Vice President, Olefins. In addition, Mr. Teel has been the Senior VicePresident, Olefins of Westlake Partners' general partner since July 2014. Mr. Teel joined us in September 2009 as Director, Olefins and Feedstock after a 23-yearcareer with Lyondell Chemical Company where he served as the Vice President, Refining from August 2006 to May 2008. From 2001 to 2006, Mr. Teel held theposition of Director, Corporate Planning and Business Development at Lyondell Chemical Company. During his career, he has held a variety of marketing,operations and general management assignments. Mr. Teel received a B.S. in Chemical Engineering from New Mexico State University and an M.S. in Financefrom the University of Houston.23Table of ContentsL. Benjamin Ederington (age 49). Mr. Ederington has been our Senior Vice President, General Counsel, Chief Administrative Officer and CorporateSecretary since July 2017. From December 2015 to July 2017, Mr. Ederington served as our Vice President, General Counsel, Chief Administrative Officer andCorporate Secretary and, from October 2013 to December 2015, he served as our Vice President, General Counsel and Corporate Secretary. In addition,Mr. Ederington has been the Vice President, General Counsel, Secretary and a director of Westlake Partners' general partner since its formation in March 2014.Prior to joining Westlake, he held a variety of senior legal positions at LyondellBasell Industries, N.V. and its predecessor companies, LyondellBasell IndustriesAF SCA and Lyondell Chemical Company, including most recently as Associate General Counsel, Commercial & Strategic Transactions from March 2010 toSeptember 2013. He began his legal career more than 20 years ago at the law firm of Steptoe & Johnson, LLP. Mr. Ederington holds a B.A. from Yale Universityand received his J.D. from Harvard University.Andrew Kenner (age 55). Mr. Kenner has been our Senior Vice President, Chemical Manufacturing since July 2017. From July 2008 to July 2017, Mr.Kenner served as our Vice President, Manufacturing. Mr. Kenner joined us after a 19-year career at Valero Energy Corporation where he served as Vice Presidentand General Manager of Valero's Delaware City Refinery from 2005 to 2008. Prior to 2005, Mr. Kenner held the position of Vice President and General Managerof Valero's Houston Refinery as well as other leadership positions in Valero's refining system. Mr. Kenner holds a B.S. in Aerospace Engineering from TexasA&M University and a M.S. in Chemical Engineering from the University of Texas at Austin.George J. Mangieri (age 69). Mr. Mangieri has been our Senior Vice President and Chief Accounting Officer since July 2017. From February 2007 to July2017, Mr. Mangieri served as our Vice President and Chief Accounting Officer and, from April 2000 to February 2007, he served as our Vice President andController. In addition, Mr. Mangieri has been the Vice President and Chief Accounting Officer of Westlake Partners' general partner since its formation inMarch 2014. Prior to joining us, Mr. Mangieri served as Vice President and Controller of Zurn Industries, Inc. from 1998 to 2000. He previously was employed asVice President and Controller for Imo Industries, Inc. in New Jersey, and spent over 10 years in public accounting with Ernst & Young LLP, where he served asSenior Manager. He received his Bachelor of Science degree from Monmouth College and is a Certified Public Accountant.24Table of ContentsPART IIItem 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity SecuritiesStockholder MattersAs of February 12, 2020, there were 36 holders of record of our common stock. Our common stock is listed on the New York Stock Exchange under thesymbol "WLK."Issuer Purchases of Equity SecuritiesThe following table provides information on our purchase of equity securities during the quarter ended December 31, 2019:Period Total Numberof SharesPurchased (1) Average PricePaid PerShare Total Numberof SharesPurchased as Partof PubliclyAnnounced Plansor Programs (2) Maximum Number(or ApproximateDollar Value) ofShares thatMay Yet BePurchased Under thePlans or Programs (2)October 2019 60,758 $60.30 — $184,872,000November 2019 32 73.95 — 184,872,000December 2019 10,537 67.01 — 184,872,000Total 71,327 $61.30 — ______________________________(1)Includes 60,758, 32 and 10,537 shares withheld in October 2019, November 2019 and December 2019, respectively, in satisfaction of withholding taxes dueupon the vesting of restricted stock units granted to our employees under the 2013 Plan.(2)In November 2014, our Board of Directors authorized a $250 million stock repurchase program (the "2014 Program"). In November 2015, our Board ofDirectors approved the expansion of the 2014 Program by an additional $150 million. In August 2018, our Board of Directors approved the furtherexpansion of the existing 2014 Program by an additional $150 million. As of December 31, 2019, 6,080,191 shares of our common stock had been acquiredat an aggregate purchase price of approximately $365 million under the 2014 Program. Transaction fees and commissions are not reported in the averageprice paid per share in the table above. Decisions regarding the amount and the timing of purchases under the 2014 Program will be influenced by our cashon hand, our cash flows from operations, general market conditions and other factors. The 2014 Program may be discontinued by our Board of Directors atany time.25Table of ContentsEquity Compensation Plan InformationSecurities authorized for issuance under equity compensation plans are as follows:Plan Category Number of securities to be issued uponexercise of outstandingoptions,warrants and rights(a) Weighted-averageexercise price ofoutstandingoptions, warrants and rights(b) Number of securitiesremaining availablefor future issuance underequitycompensation plans(excluding securitiesreflected in column(a))(c)Equity compensation plans approved by security holders 1,926,448(1) $60.29(2) 4,009,687Equity compensation plans not approved by security holders N/A N/A N/ATotal 1,926,448 $60.29(2) 4,009,687______________________________(1)Includes shares reserved for issuance pursuant to restricted stock units, stock options and performance stockunits.(2)Price applies only to the stock options included in column (a). Exercise price is not applicable to the other awards included in column(a).Other information regarding our equity compensation plans is set forth in the section entitled "Executive Compensation" in our Proxy Statement, whichinformation is incorporated herein by reference.26Table of ContentsItem 6. Selected Financial and Operational Data (1) Year Ended December 31, 2019 2018 2017 2016 2015 (dollars in millions, except share amounts, per share data and volume data)Statement of Operations Data: Net sales $8,118 $8,635 $8,041 $5,076 $4,463Gross profit 1,260 1,987 1,761 983 1,190Selling, general and administrative expenses 458 445 399 258 218Amortization of intangibles 109 101 108 38 7Restructuring, transaction and integration-relatedcosts 37 33 29 104 —Income from operations 656 1,408 1,225 583 965Interest expense (124) (126) (159) (79) (35)Other income, net 38 52 15 54 33Income before income taxes 570 1,334 1,081 558 963Provision for (benefit from) income taxes 108 300 (258) 138 298Net income 462 1,034 1,339 420 665Net income attributable to noncontrollinginterests 41 38 35 21 19Net income attributable to Westlake ChemicalCorporation $421 $996 $1,304 $399 $646Earnings Per Share Attributable to WestlakeChemical Corporation: Basic $3.26 $7.66 $10.05 $3.07 $4.88Diluted $3.25 $7.62 $10.00 $3.06 $4.86Weighted average shares outstanding Basic 128,395,184 129,401,823 129,087,043 129,367,712 131,823,707Diluted 128,757,293 129,985,753 129,540,013 129,974,822 132,301,812Balance Sheet Data (end of period): Cash and cash equivalents $728 $753 $1,531 $459 $663Marketable securities — — — — 520Working capital (2) 1,501 1,659 1,496 1,225 1,652Total assets 13,261 11,602 12,076 10,890 5,569Total long-term debt, net 3,445 2,668 3,127 3,679 758Total Westlake Chemical Corporation stockholders'equity 5,860 5,590 4,874 3,524 3,266Cash dividends declared per share $1.0250 $0.9200 $0.8012 $0.7442 $0.6393Other Operating Data: Cash flows from: Operating activities $1,301 $1,409 $1,528 $867 $1,079Investing activities (1,954) (754) (652) (2,563) (1,006)Financing activities 630 (1,427) 6 1,687 (287)Depreciation and amortization 713 641 601 378 246Capital expenditures 787 702 577 629 491EBITDA (3) 1,407 2,101 1,841 1,015 1,24427Table of Contents Year Ended December 31, 2019 2018 2017 2016 2015 External Sales Volume (millions of pounds): Olefins Segment Polyethylene 2,565 2,438 2,363 2,392 2,445Styrene, feedstock and other 880 671 828 794 1,182Vinyls Segment PVC, caustic soda and other 16,712 16,629 15,997 8,118 5,026Building products 1,178 1,180 1,193 770 629______________________________(1)The historical selected financial and operational data should be read together with Item 7, Management's Discussion and Analysis of Financial Condition andResults of Operations, and Item 8, Financial Statements and Supplementary Data included in this Form 10-K.(2)Working capital equals current assets less currentliabilities.(3)EBITDA (a non-GAAP financial measure) is calculated as net income before interest expense, income taxes, depreciation and amortization. The body ofaccounting principles generally accepted in the United States is commonly referred to as "GAAP." For this purpose, a non-GAAP financial measure isgenerally defined by the Securities and Exchange Commission ("SEC") as one that purports to measure historical or future financial performance, financialposition 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 directlycomparable measure calculated and presented in accordance with GAAP in the statement of income, balance sheet or statement of cash flows (or equivalentstatements) of the registrant; or (2) includes amounts, or is subject to adjustments that have the effect of including amounts, that are excluded from the mostdirectly comparable measure so calculated and presented. In this report, we disclose non-GAAP financial measures, primarily earnings before interest, taxes,depreciation and amortization ("EBITDA"). The non-GAAP financial measures described in this Form 10-K are not substitutes for the GAAP measures ofearnings and cash flows. EBITDA is included in this Form 10-K because our management considers it an important supplemental measure of ourperformance and believes that it is frequently used by securities analysts, investors and other interested parties in the evaluation of companies in our industry,some of which present EBITDA when reporting their results. We regularly evaluate our performance as compared to other companies in our industry thathave different financing and capital structures and/or tax rates by using EBITDA. In addition, we utilize EBITDA in evaluating acquisition targets.Management also believes that EBITDA is a useful tool for measuring our ability to meet our future debt service, capital expenditures and working capitalrequirements, and EBITDA is commonly used by us and our investors to measure our ability to service indebtedness. EBITDA is not a substitute for theGAAP measures of net income, income from operations and net cash provided by operating activities and is not necessarily a measure of our ability to fundour cash needs. In addition, it should be noted that companies calculate EBITDA differently and, therefore, EBITDA as presented for us may not becomparable to EBITDA reported by other companies. EBITDA has material limitations as a performance measure because it excludes interest expense,depreciation and amortization and income taxes. The following table reconciles EBITDA to net income, income from operations and net cash provided byoperating activities.28Table of ContentsReconciliation of EBITDA to Net Income, Income from Operations and Net Cash Provided by Operating Activities Year Ended December 31, 2019 2018 2017 2016 2015 (dollars in millions)Net cash provided by operating activities $1,301 $1,409 $1,528 $867 $1,079Changes in operating assets and liabilities andother (785) (313) (723) (346) (374)Deferred income taxes (54) (62) 534 (101) (40)Net income 462 1,034 1,339 420 665Less: Other income, net 38 52 15 54 33Interest expense (124) (126) (159) (79) (35)(Provision for) benefit from income taxes (108) (300) 258 (138) (298)Income from operations 656 1,408 1,225 583 965Add: Depreciation and amortization 713 641 601 378 246Other income, net 38 52 15 54 33EBITDA $1,407 $2,101 $1,841 $1,015 $1,24429Table of ContentsItem 7. Management's Discussion and Analysis of Financial Condition and Results of OperationsOverviewWe are a vertically-integrated global manufacturer and marketer of chemicals, polymers and building products. Our two principal operating segments areOlefins and Vinyls. We use the majority of our internally-produced basic chemicals to produce higher value-added chemicals and building products.Consumption of the basic chemicals that we manufacture in the commodity portions of our olefins and vinyls processes has increased significantly since webegan operations in 1986. Our olefins and vinyls products are some of the most widely used chemicals in the world and are upgraded into a wide variety of highervalue-added chemical products used in many end-markets. Petrochemicals are typically manufactured in large volume by a number of different producers usingwidely available technologies. The petrochemical industry exhibits cyclical commodity characteristics, and margins are influenced by changes in the balancebetween supply and demand and the resulting operating rates, the level of general economic activity and the price of raw materials. Due to the significant size ofnew plants, capacity additions are built in large increments and typically require several years of demand growth to be absorbed. The cycle is generallycharacterized by periods of tight supply, leading to high operating rates and margins, followed by a decline in operating rates and margins primarily as a result ofexcess new capacity additions.Ethane-based ethylene producers have in the recent past experienced a cost advantage over naphtha-based ethylene producers during periods of higher crudeoil prices. This cost advantage has resulted in a strong export market for polyethylene and other ethylene derivatives and has benefited operating margins and cashflows for our Olefins segment during such periods. However, we have seen a significant reduction in the cost advantage enjoyed by North American ethane-basedethylene producers due to lower crude oil prices from the third quarter of 2014 through 2019, which has resulted in reduced prices and lower margins for ourOlefins segment. Further, our Olefins segment has experienced lower profitability in recent periods due to several new ethylene and polyethylene capacityadditions in North America and Asia that have led to additional supply of ethylene and polyethylene. In recent months, we have seen volatility in ethane andethylene prices, primarily due to changes in the anticipated timing for some of the new ethylene capacity additions and availability of natural gas liquids, as well asfluctuation in the price of crude oil. Looking forward, new ethylene and polyethylene capacity additions in North America, Asia and the Middle East will addadditional supply and may continue to contribute to periods of lower profitability in our Olefins segment.Since late 2010, the PVC industry in the U.S. has experienced an increase in PVC resin exports, driven largely by more competitive feedstock and energycost positions in the U.S. As a consequence, the U.S. PVC resin industry operating rates have improved since 2010. Westlake is the second-largest chlor-alkaliproducer and the second-largest PVC producer in the world. Globally, there were large chlor-alkali capacity additions between 2008 and 2015 resulting in excesscapacity and lower industry operating rates which exerted downward pressure on caustic soda pricing. From 2015 through the end of 2018, the capacity additionshave been outpaced by an increase in demand driven by improving economic growth and U.S. producers' competitive export position, which resulted in improvedoperating rates and caustic soda pricing. Since the end of 2018, the uncertainties surrounding international trade have impacted both domestic and export prices forour products. Depending on the performance of the global economy, potential changes in international trade and tariffs policies, the trend of crude oil prices and thetiming of the new ethylene capacity additions in 2020 and beyond, our financial condition, results of operations or cash flows could be negatively or positivelyimpacted.We purchase significant amounts of ethane feedstock, natural gas, ethylene and salt from external suppliers for use in production of basic chemicals in theolefins and vinyls chains. We also purchase significant amounts of electricity to supply the energy required in our production processes. While we have agreementsproviding for the supply of ethane feedstock, natural gas, ethylene, salt and electricity, the contractual prices for these raw materials and energy vary with marketconditions and may be highly volatile. Factors that have caused volatility in our raw material prices in the past, and which may do so in the future include:•the availability of feedstock from shale gas and oildrilling;•supply and demand for crudeoil;•shortages of raw materials due to increasingdemand;•ethane and liquefied natural gasexports;•capacity constraints due to higher construction costs for investments, construction delays, strike action or involuntaryshutdowns;•the general level of business and economic activity;and•the direct or indirect effect of governmentalregulation.30Table of ContentsSignificant volatility in raw material costs tends to put pressure on product margins as sales price increases could lag behind raw material cost increases.Conversely, when raw material costs decrease, customers may seek immediate relief in the form of lower sales prices. We currently use derivative instruments toreduce price volatility risk on feedstock commodities and lower overall costs. Normally, there is a pricing relationship between a commodity that we process andthe feedstock from which it is derived. When this pricing relationship deviates from historical norms, we have from time to time entered into derivative instrumentsand physical positions in an attempt to take advantage of this relationship.Our historical results have been significantly affected by our plant production capacity, our efficient use of that capacity and our ability to increase capacity.Since our inception, we have followed a disciplined growth strategy that focuses on plant acquisitions, new plant construction and internal expansion. We evaluateeach expansion project on the basis of its ability to produce sustained returns in excess of our cost of capital and its ability to improve efficiency or reduceoperating costs. We also regularly look at acquisition opportunities that would be consistent with, or complimentary to, our overall business strategies. Dependingon the size of the acquisition, any such acquisitions could require external financing.As noted above in Item 1A, "Risk Factors," we are subject to extensive environmental regulations, which may impose significant additional costs on ouroperations in the future. Further, concerns about GHG emissions and their possible effects on climate change has led to the enactment of regulations, and toproposed legislation and additional regulations, that could affect us in the form of increased cost of feedstocks and fuel, other increased costs of production anddecreased demand for our products. While we do not expect any of these enactments or proposals to have a material adverse effect on us in the near term, wecannot predict the longer-term effect of any of these regulations or proposals on our future financial condition, results of operations or cash flows.Non-GAAP Financial MeasuresThe body of accounting principles generally accepted in the United States is commonly referred to as "GAAP." For this purpose, a non-GAAP financialmeasure is generally defined by the SEC as one that purports to measure 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 andpresented 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 socalculated and presented. In this report, we disclose non-GAAP financial measures, primarily earnings before interest, taxes, depreciation and amortization("EBITDA"). We define EBITDA as net income before interest expense, income taxes, depreciation and amortization. The non-GAAP financial measuresdescribed in this Form 10-K are not substitutes for the GAAP measures of earnings and cash flows.EBITDA is included in this Form 10-K because our management considers it an important supplemental measure of our performance and believes that it isfrequently used by securities analysts, investors and other interested parties in the evaluation of companies in our industry, some of which present EBITDA whenreporting their results. We regularly evaluate our performance as compared to other companies in our industry that have different financing and capital structuresand/or tax rates by using EBITDA. In addition, we utilize EBITDA in evaluating acquisition targets. Management also believes that EBITDA is a useful tool formeasuring our ability to meet our future debt service, capital expenditures and working capital requirements, and EBITDA is commonly used by us and ourinvestors to measure our ability to service indebtedness. EBITDA is not a substitute for the GAAP measures of net income, income from operations and net cashprovided by operating activities and is not necessarily a measure of our ability to fund our cash needs. In addition, it should be noted that companies calculateEBITDA differently and, therefore, EBITDA as presented for us may not be comparable to EBITDA reported by other companies. EBITDA has materiallimitations as a performance measure because it excludes interest expense, depreciation and amortization and income taxes.Recent DevelopmentsOn November 12, 2019, we, through one of our subsidiaries, Eagle US 2 LLC ("Eagle"), completed the acquisition of an additional 34.8% of themembership interests in LACC, LLC ("LACC") from Lotte Chemical USA Corporation, a subsidiary of Lotte Chemical Corporation ("Lotte") for approximately$817 million (the "Transaction"). Prior to the Transaction, Eagle owned approximately 12% of the membership interests in LACC.On July 17, 2019, we completed the registered public offering of €700 million aggregate principal amount of the 1.625% 2029 Senior Notes.31Table of ContentsResults of OperationsSegment Data Year Ended December 31, 2019 2018 2017 (dollars in millions, except per share data)Net external sales Olefins Polyethylene $1,301 $1,519 $1,518Styrene, feedstock and other 481 500 533Total Olefins 1,782 2,019 2,051Vinyls PVC, caustic soda and other 5,068 5,359 4,769Building products 1,268 1,257 1,221Total Vinyls 6,336 6,616 5,990Total $8,118 $8,635 $8,041 Income (loss) from operations Olefins $260 $573 $655Vinyls 451 913 639Corporate and other (55) (78) (69)Total income from operations 656 1,408 1,225Interest expense (124) (126) (159)Other income, net 38 52 15Provision for (benefit from) income taxes 108 300 (258)Net income 462 1,034 1,339Net income attributable to noncontrolling interests 41 38 35Net income attributable to Westlake Chemical Corporation $421 $996 $1,304Diluted earnings per share $3.25 $7.62 $10.00 Year Ended December 31, 2019 2018 Average SalesPrice Volume Average SalesPrice VolumeProduct sales price and volume percentage change fromprior year Olefins -21 % +9% -1 % —%Vinyls -8 % +3% +7 % +4%Company average -11 % +5% +5 % +3%32Table of ContentsAverage Industry Prices (1) Year Ended December 31, 2019 2018 2017Average domestic prices Ethane (cents/lb) (2) 7.3 11.0 8.3Propane (cents/lb) (3) 12.7 20.8 18.1Ethylene (cents/lb) (4) 18.5 19.0 28.0Polyethylene (cents/lb) (5) 59.0 71.3 71.1Styrene (cents/lb) (6) 79.1 91.4 86.5Caustic soda ($/short ton) (7) 692 768 635Chlorine ($/short ton) (8) 175 171 151PVC (cents/lb) (9) 68.4 67.4 62.6 Average export prices Polyethylene (cents/lb) (10) 41.0 55.8 58.8Caustic soda ($/short ton) (11) 273 474 436PVC (cents/lb) (12) 34.9 36.9 38.0______________________________(1)Industry pricing data was obtained through IHS Markit ("IHS"). We have not independently verified thedata.(2)Average Mont Belvieu spot prices of purity ethane over theperiod.(3)Average Mont Belvieu spot prices of non-TET propane over theperiod.(4)Average North American spot prices of ethylene over theperiod.(5)Average North American Net Transaction prices of polyethylene low density GP-Film grade over theperiod.(6)Average North American contract prices of styrene over theperiod.(7)Average USGC-CSLi index values for caustic soda over the period. As stated by IHS, "the caustic soda price listing represents the USGC-CSLi values.USGC-CSLi does not reflect contract price discounts, implementation lags, caps or other adjustments factors. Additionally, it is not intended to represent asimple arithmetic average of all market transactions occurring during the month. Rather, the USGC-CSLi is most representative of the month-to-monthcaustic soda price movement for contract volumes of liquid 50% caustic soda rather than the absolute value of contract prices at a particular point in time. Itis intended to serve only as a benchmark."(8)Average North American contract prices of chlorine over the period. Effective January 1, 2019, IHS made a non-market average downward adjustment of$172.50 per short ton to chlorine prices. For comparability, we adjusted the prior period's chlorine price downward by $172.50 per short ton consistent withthe IHS non-market adjustment.(9)Average North American contract prices of pipe grade PVC over the period. As stated by IHS, "the contract resin prices posted reflect an "index" or"market" for prices before discounts, rebates, incentives, etc."(10)Average North American export price for low density polyethylene GP-Film grade over theperiod.(11)Average North American low spot export prices of caustic soda over theperiod.(12)Average North American spot export prices of PVC over theperiod.33Table of ContentsSummaryFor the year ended December 31, 2019, net income attributable to Westlake Chemical Corporation was $421 million, or $3.25 per diluted share, on net salesof $8,118 million. This represents a decrease in net income attributable to Westlake Chemical Corporation of $575 million, or $4.37 per diluted share, compared to2018 net income attributable to Westlake Chemical Corporation of $996 million, or $7.62 per diluted share, on net sales of $8,635 million. Net income for the yearended December 31, 2019 decreased versus the prior year primarily due to lower sales prices for our major products resulting from international trade uncertaintiesand slower global economic growth, partially offset by lower purchased ethylene, feedstock and fuel costs and a lower effective income tax rate. Net sales for theyear ended December 31, 2019 decreased $517 million to $8,118 million compared to net sales for the year ended December 31, 2018 of $8,635 million, mainlydue to lower sales prices for our major products and lower sales volumes for PVC resin, partially offset by an increase in sales volumes for polyethylene, styreneand PVC compounds. Income from operations was $656 million for the year ended December 31, 2019 as compared to $1,408 million for the year endedDecember 31, 2018, a decrease of $752 million. The decrease in income from operations versus the prior year was primarily due to lower sales prices for our majorproducts, partially offset by lower purchased ethylene, ethane and fuel costs. Pre-tax restructuring, transaction and integration-related costs for the year endedDecember 31, 2019 were $37 million, or $0.23 per diluted share after tax, as compared to $33 million in 2018.2019 Compared with 2018Net Sales. Net sales decreased by $517 million, or 6%, to $8,118 million in 2019 from $8,635 million in 2018, primarily attributable to lower sales prices forour major products and lower sales volumes for PVC resin, partially offset by higher sales volumes for polyethylene, styrene and PVC compounds. Average salesprices for 2019 decreased by 11% as compared to 2018. Sales volumes increased by 5% in 2019 as compared to 2018.Gross Profit. Gross profit margin percentage decreased to 16% in 2019 from 23% in 2018. The gross profit margin decreased primarily due to lower salesprices for our major products (resulting in lower margins), partially offset by lower ethane feedstock, purchased ethylene and fuel costs, as compared to 2018.Selling, General and Administrative Expenses. Selling, general and administrative expenses increased by $13 million to $458 million in 2019 from $445million in 2018. This increase was mainly due to selling, general and administrative expenses related to the acquisition of NAKAN, partially offset by lowerprofessional consulting fees.Amortization of Intangibles. Amortization expense for 2019 was $109 million, as compared to $101 million for 2018. The increase in amortization expensewas primarily due to intangible assets related to the acquisition of NAKAN.Restructuring, Transaction and Integration-related Costs. Restructuring, transaction and integration-related costs of $37 million in 2019 were higher ascompared to $33 million in 2018. The restructuring, transaction and integration-related costs for 2019 primarily consisted of restructuring expenses of $26 millionand acquisition costs. The restructuring expenses primarily represent charges associated with the write-off of certain assets. The restructuring, transaction andintegration-related costs for 2018 of $33 million primarily consisted of integration-related consulting fees and acquisition costs.Interest Expense. Interest expense decreased by $2 million to $124 million in 2019 from $126 million in 2018, primarily as a result of a lower averageinterest rate for the outstanding debt in 2019 as compared to 2018. The lower average interest rate was primarily due to the redemption of the 4.875% 2023 Notesand the 4.625% 2021 Notes in 2018 and the issuance of the 1.625% 2029 Senior Notes in July 2019. See "Liquidity and Capital Resources—Debt" below and Note11 to the consolidated financial statements included in this Form 10-K for further discussion of our indebtedness.Other Income, Net. Other income, net decreased by $14 million to $38 million in 2019 from $52 million in 2018. This decrease was primarily due to therecognition of a one-time pension settlement gain of $14 million in 2018.Income Taxes. The effective income tax expense rate was 19% in 2019 as compared to 22% in 2018. The effective income tax rate in 2019 was lower ascompared to 2018 and lower compared to the U.S. federal statutory rate of 21%, primarily due to the reduction of a valuation allowance recorded against foreignNOL and credit carryforwards and the reduction in accrual of withholding tax on unremitted foreign earnings, partially offset by an increase in state tax expense.Olefins SegmentNet Sales. Net sales decreased by $237 million, or 12%, to $1,782 million in 2019 from $2,019 million in 2018. The decrease was mainly due to lower salesprices for our major products, partially offset by higher polyethylene and styrene sales volumes, as compared to 2018. Average sales prices for the Olefins segmentdecreased by 21% in 2019 as compared to 2018, primarily due to increased olefins production from new industry capacity. Sales volumes for the Olefins segmentincreased by 9% in 2019, as compared to 2018.34Table of ContentsIncome from Operations. Income from operations decreased by $313 million to $260 million in 2019 from $573 million in 2018. The decrease in incomefrom operations was primarily due to the lower sales prices for our major products, partially offset by higher sales volumes for our major products and lowerfeedstock and fuel costs. Trading activity in 2019 resulted in a loss of approximately $26 million as compared to a gain of $3 million in 2018.Vinyls SegmentNet Sales. Net sales decreased by $280 million, or 4%, to $6,336 million in 2019 from $6,616 million in 2018. Average sales prices for the Vinyls segmentdecreased by 8% in 2019, as compared to 2018, mainly due to lower sales prices for caustic soda and lower sales prices and volumes for PVC resins, partially offsetby higher PVC compounds sales volumes. Average sales volumes increased by 3% in 2019, as compared to 2018.Income from Operations. Income from operations decreased by $462 million to $451 million in 2019 from $913 million in 2018. This decrease in incomefrom operations was primarily due to lower caustic soda and PVC resin sales prices, partially offset by lower purchased ethylene, ethane feedstock and fuel costs.2018 Compared with 2017Net Sales. Net sales increased by $594 million, or 7%, to $8,635 million in 2018 from $8,041 million in 2017, primarily attributable to higher sales prices andvolumes for caustic soda and higher sales volumes for PVC resin and polyethylene, partially offset by lower polyethylene sales prices and lower styrene salesvolumes. Average sales prices for 2018 increased by 5% as compared to 2017. Sales volumes increased by 3% in 2018 as compared to 2017.Gross Profit. Gross profit margin percentage increased to 23% in 2018 from 22% in 2017. The gross profit margin for 2018 was higher primarily due tohigher sales prices and volumes for caustic soda, lower purchased ethylene costs and improved operating rates in the Vinyls segment due to fewer plannedturnarounds and unplanned outages, partially offset by higher ethane feedstock costs, as compared to 2017.Selling, General and Administrative Expenses. Selling, general and administrative expenses increased by $46 million, or 12%, to $445 million in 2018 from$399 million in 2017. This increase was mainly due to an increase in employee compensation and professional consulting fees.Amortization of Intangibles. Amortization expense for 2018 was comparable to 2017.Restructuring, Transaction and Integration-related Costs. Restructuring, transaction and integration-related costs were $33 million in 2018 as compared to$29 million in 2017. The restructuring, transaction and integration-related costs primarily consisted of integration-related consulting fees, severance benefitsprovided in conjunction with acquisition and reorganization charges.Interest Expense. Interest expense decreased by $33 million to $126 million in 2018 from $159 million in 2017, primarily as a result of lower average debtoutstanding for 2018 as compared to 2017. The lower average debt balance in 2018 was mainly due to the redemption of the 2023 Notes in May 2018 and the 2021Notes in February 2018. See "Liquidity and Capital Resources—Debt" below for further discussion of our indebtedness.Other Income, Net. Other income, net increased by $37 million to $52 million in 2018 from $15 million in 2017. The increase was primarily attributable to aone-time pension settlement gain of $14 million, an increase in interest income of $13 million, a net gain of $6 million recognized on the redemption of the 2021Notes and an increase in income from unconsolidated subsidiaries of $6 million.Income Taxes. The effective income tax rate was an expense of 22% in 2018 as compared to a benefit of 24% in 2017. The effective tax rate in 2018 washigher as compared to 2017, primarily due to the recognition of a $591 million income tax benefit in 2017 as a result of the revaluation of deferred tax assets andliabilities. In addition, the U.S. corporate income tax rate was lower in 2018 as compared to 2017. The effective income tax rate in 2018 was above the U.S. federalstatutory rate of 21% primarily due to state and foreign taxes.Olefins SegmentNet Sales. Net sales decreased by $32 million, or 2%, to $2,019 million in 2018 from $2,051 million in 2017. This decrease was mainly due to lower salesvolumes for styrene as a result of a planned turnaround in the second quarter of 2018 and lower polyethylene sales prices, partially offset by higher sales volumesfor polyethylene and higher sales prices for styrene, as compared to 2017. Average sales prices for the Olefins segment decreased by 1% in 2018 as compared to2017, while average sales volumes in 2018 were consistent with 2017.35Table of ContentsIncome from Operations. Income from operations was $573 million in 2018 as compared to $655 million in 2017. This decrease was primarily due to lowermargins resulting from higher ethane feedstock costs and lower polyethylene sales prices, partially offset by higher polyethylene sales volumes.Vinyls SegmentNet Sales. Net sales increased by $626 million, or 10%, to $6,616 million in 2018 from $5,990 million in 2017. This increase was mainly attributable tohigher sales prices and volumes for caustic soda and higher sales volumes for PVC resin as compared to 2017. Average sales volumes increased by 4% in 2018, ascompared to 2017 and average sales prices increased by 7% in 2018 as compared to 2017.Income from Operations. Income from operations was $913 million in 2018 as compared to $639 million in 2017. This increase was mainly attributable tohigher sales prices and volumes for caustic soda, lower purchased ethylene costs, improved operating rates and lower costs associated with planned turnarounds andunplanned outages, as compared to 2017.Cash FlowsOperating ActivitiesOperating activities provided cash of $1,301 million in 2019 compared to cash provided of $1,409 million in 2018. The $108 million decrease in cash flowsfrom operating activities was mainly due to the decrease in income from operations in 2019, as compared to 2018, partially offset by a decrease in working capitalrequirements. Income from operations decreased by $752 million in 2019, as compared to 2018. The decrease in income from operations was primarily a result oflower sales prices for our major products and other factors as discussed in "Summary" above. Changes in components of working capital, which we define forpurposes of this cash flow discussion as accounts receivable, inventories, prepaid expenses and other current assets, less accounts payable and accrued liabilities,provided cash of $68 million in 2019, compared to $290 million of cash used in 2018, a favorable change of $358 million. The favorable change was driven mainlyby changes in accounts receivable and inventories. Favorable changes in accounts receivables and inventories were primarily the result of lower sales prices for ourproducts and lower feedstock costs in 2019, as compared to 2018.Operating activities provided cash of $1,409 million in 2018 compared to cash provided of $1,528 million in 2017. The $119 million decrease in cash flowsfrom operating activities was mainly due to an increase in working capital requirements, partially offset by an increase in income from operations in 2018 andlower income taxes for 2018 as a result of the Tax Act, as compared to 2017. Income from operations increased by $183 million in 2018, as compared to the prioryear 2017. The increase in income from operations was primarily a result of higher sales price and volume for caustic soda, partially offset by higher feedstockcosts. Changes in components of working capital, which we define for purposes of this cash flow discussion as accounts receivable, inventories, prepaid expensesand other current assets, less accounts payable and accrued liabilities used cash of $290 million in 2018, compared to $155 million of cash provided in 2017, anunfavorable change of $445 million. The change was mainly driven by unfavorable changes in inventories, accounts payable and accrued liabilities. Unfavorablechanges in inventories were primarily the result of higher feedstock costs in 2018 compared to 2017, and the changes in accounts payable and accrued liabilitieswere primarily due to the timing of purchases and payments to suppliers as well as due to a lower income tax accrual as a result of the lower tax rate under the TaxAct.Investing ActivitiesNet cash used for investing activities during 2019 was $1,954 million as compared to net cash used of $754 million in 2018. Capital expenditures were $787million in 2019 compared to $702 million in 2018. Higher investing activities in 2019 were primarily due to acquisitions for $314 million, net of cash acquired, thepurchase of the additional 34.8% interest in LACC for $817 million in November 2019 and payment of $45 million to fund the construction costs of LACC. Capitalexpenditures in 2019 and 2018 were primarily related to expansion projects as well as projects to improve production capacity or reduce costs, maintenance andsafety and environmental projects at our various facilities. The expansion projects include our previously announced expansions of PVC and VCM capacities atour plants in Germany and Geismar, Louisiana. Please see "Liquidity and Capital Resources—Liquidity and Financing Arrangements" below for furtherdiscussion.36Table of ContentsNet cash used for investing activities during 2018 was $754 million as compared to net cash used of $652 million in 2017. Capital expenditures were $702million in 2018 compared to $577 million in 2017. Capital expenditures in 2018 were primarily related to expansion projects as well as projects to improveproduction capacity or reduce costs, maintenance and safety and environmental projects at our various facilities. The expansion projects include our previouslyannounced ongoing expansions of chlor-alkali, PVC and VCM capacities at our plants in Germany and Geismar. Capital expenditures in 2017 were primarilyincurred on the upgrade and expansion of OpCo's Calvert City ethylene plant at our Calvert City site. The remaining capital expenditures in 2017 primarily relatedto projects to improve production capacity or reduce costs, maintenance and safety and environmental projects at our various facilities. We spent $58 million in2018 to fund the construction costs of our LACC joint venture, as compared to $66 million in 2017. In addition, we invested $10 million in other unconsolidatedsubsidiaries in 2018. Please see "Liquidity and Capital Resources—Liquidity and Financing Arrangements" below for further discussion.Financing ActivitiesNet cash provided by financing activities during 2019 was $630 million as compared to net cash used of $1,427 million in 2018. In 2019, we receivedproceeds of $784 million from the issuance of the 1.625% 2029 Senior Notes and $63 million from the issuance of Westlake Partners common units. Theremaining activities in 2019 were primarily related to the $132 million payment of cash dividends, the $50 million payment of cash distributions to noncontrollinginterests, repurchases of common stock of $30 million, repayment of notes payable of $18 million and proceeds of $20 million from the issuance of short-termnotes payable. The 2018 activity was mainly related to the redemption of $704 million principal amount of the 2021 Notes in February 2018 and the redemption of$461 million principal amount of the 2023 Notes in May 2018. The remaining activities in 2018 were primarily related to the $120 million payment of cashdividends, the $45 million payment of cash distributions to noncontrolling interests, repurchases of common stock of $106 million and proceeds of $14 millionfrom the issuance of short-term notes payable.Net cash used by financing activities during 2018 was $1,427 million as compared to net cash provided of $6 million in 2017. We used $1,179 million for therepayment of notes payable, of which $704 million was used for the redemption of the 2021 Notes in February 2018 and $461 million was used for the redemptionof the 2023 Notes in May 2018 and the remaining balance was used for the repayment of short-term notes payable. The remaining activities in 2018 were primarilyrelated to the $120 million payment of cash dividends, the $45 million payment of cash distributions to noncontrolling interests, treasury stock repurchases of $106million and proceeds of $14 million from the issuance of short-term notes payable. The 2017 activity was mainly related to the issuance of notes, drawdown underthe Credit Agreement and issuance of Westlake Partners common units, partially offset by repayment of borrowings under the Credit Agreement, the payment ofcash dividends, the payment of cash distributions to noncontrolling interests and the payment of debt issuance costs.Liquidity and Capital ResourcesLiquidity and Financing ArrangementsOur principal sources of liquidity are from cash and cash equivalents, cash from operations, short-term borrowings under the Credit Agreement and our long-term financing.In November 2014, our Board of Directors authorized a $250 million stock repurchase program (the "2014 Program"). In November 2015, our Board ofDirectors approved the expansion of the 2014 Program by an additional $150 million. In August 2018, our Board of Directors approved the further expansion ofthe existing 2014 Program by an additional $150 million. As of December 31, 2019, we had repurchased 6,080,191 shares of our common stock for an aggregatepurchase price of approximately $365 million under the 2014 Program. During the year ended December 31, 2019, 517,712 shares of our common stock wererepurchased under the 2014 Program. Purchases under the 2014 Program may be made either through the open market or in privately negotiated transactions.Decisions regarding the amount and the timing of purchases under the 2014 Program will be influenced by our cash on hand, our cash flow from operations,general market conditions and other factors. The 2014 Program may be discontinued by our Board of Directors at any time.On January 2, 2019, we acquired NAKAN and paid approximately $249 million as the purchase price.On July 17, 2019, we closed the public offering of €700 million aggregate principal amount of the 1.625% 2029 Senior Notes.37Table of ContentsIn 2015, Eagle, a wholly-owned subsidiary of the Company, and Lotte formed a joint venture, LACC, to design, build and operate an ethylene facilitywith 2.2 billion pounds per year of ethylene production capacity. Pursuant to a contribution and subscription agreement between Eagle and LACC, Eaglecontributed $225 million to LACC to fund construction costs of the ethylene plant, representing approximately 12% of the membership interests in LACC. Asdiscussed above under "Recent Developments," in November 2019, Eagle acquired an additional 34.8% of the membership interests in LACC from Lotte forapproximately $817 million. We funded the purchase price for the transaction with cash on hand.We believe that our sources of liquidity as described above are adequate to fund our normal operations and ongoing capital expenditures. Funding of anypotential large expansions or potential acquisitions would likely necessitate, and therefore depend on our ability to obtain, additional financing in the future. Wemay not be able to access additional liquidity at cost effective interest rates due to the volatility of the commercial credit markets.Cash and Cash EquivalentsAs of December 31, 2019, our cash and cash equivalents totaled $728 million. In addition, we have the Credit Agreement available to supplement cash ifneeded, as described under "Debt" below.DebtAs of December 31, 2019, our indebtedness totaled $3,445 million. See Note 11 to the consolidated financial statements appearing elsewhere in this Form 10-K for a discussion of our long-term indebtedness. Defined terms used in this section have the definitions assigned to such terms in Note 11 to the consolidatedfinancial statements included in Item 8 of this Form 10-K.Our ability to make payments on our indebtedness and to fund planned capital expenditures will depend on our ability to generate cash in the future, which issubject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control. Based on our current level of operationsand unless we were to undertake a new expansion or large acquisition, we believe our cash flows from operations, available cash and available borrowings underthe Credit Agreement will be adequate to meet our normal operating needs for the foreseeable future.Credit AgreementOn July 24, 2018, we entered into a new $1 billion revolving credit facility that is scheduled to mature on July 24, 2023 (the "Credit Agreement") and, inconnection therewith, terminated the existing $1 billion revolving credit facility that was scheduled to mature on August 23, 2021 (the "Prior Credit Agreement").The Credit Agreement bears interest at either (a) LIBOR plus a spread ranging from 1.00% to 1.75% or (b) Alternate Base Rate plus a spread rangingfrom 0.00% to 0.75% in each case depending on the credit rating of the Company. At December 31, 2019, we had no borrowings outstanding under the CreditAgreement. As of December 31, 2019, we had no outstanding letters of credit and had borrowing availability of $1 billion under the Credit Agreement. The CreditAgreement contains certain affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant. As of December 31,2019, we were in compliance with the total leverage ratio financial maintenance covenant.The Credit Agreement also contains certain events of default and if and for so long as certain events of default have occurred and are continuing, anyoverdue amounts outstanding under the Credit Agreement will accrue interest at an increased rate, the lenders can terminate their commitments thereunder andpayments of any outstanding amounts could be accelerated by the lenders. None of our subsidiaries are required to guarantee our obligations under the CreditAgreement.The Credit Agreement includes a $150 million sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under thefacility. The Credit Agreement also provides for a discretionary $50 million commitment for swingline loans to be provided on a same-day basis. We may alsoincrease the size of the facility, in increments of at least $25 million, up to a maximum of $500 million, subject to certain conditions and if certain lenders agree tocommit to such an increase.In connection with our entry into the Credit Agreement and termination of the Prior Credit Agreement on July 24, 2018, all guarantees by our subsidiaries ofour payment obligations under the 4.375% 2047 Senior Notes, the 3.60% 2022 Senior Notes, the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes werereleased.38Table of ContentsGO Zone Bonds and IKE Zone BondsIn November 2017, the Louisiana Local Government Environmental Facility and Development Authority (the "Authority") completed the offering of $250million aggregate principal amount of 3.50% tax-exempt revenue refunding bonds due November 1, 2032 (the "Refunding Bonds"), the net proceeds of which wereused to redeem $250 million aggregate principal amount of the Authority's 6 ¾% tax-exempt revenue bonds due November 1, 2032 issued by the Authority underthe Gulf Opportunity Zone Act of 2005 (the "GO Zone Act") in December 2007. In connection with the issuance of the Refunding Bonds, we issued $250 millionof the 3.5% 2032 GO Zone Refunding Senior Notes. The Refunding Bonds are subject to optional redemption by the Authority upon the direction of the Companyat any time on or after November 1, 2027, for 100% of the principal plus accrued interest.In July 2010, the Authority completed the reoffering of $100 million of the 6 ½% 2029 GO Zone Bonds. In connection with the reoffering of the 6 ½% 2029GO Zone Bonds, we issued $100 million of the 6 ½% 2029 GO Zone Senior Notes. In December 2010, the Authority issued $89 million of the 6 ½% 2035 GOZone Bonds. In connection with the issuance of the 6 ½% 2035 GO Zone Bonds, we issued $89 million of the 6 ½% 2035 GO Zone Senior Notes. In December2010, the Authority completed the offering of $65 million of the 6 ½% 2035 IKE Zone Bonds under Section 704 of the Emergency Economic Stabilization Act of2008 (the "IKE Zone Act"). In connection with the issuance of the 6 ½% 2035 IKE Zone Bonds, we issued $65 million of the 6 ½% 2035 IKE Zone Senior Notes.The 6 ½% 2029 GO Zone Bonds are subject to optional redemption by the Authority upon the direction of the Company at any time prior to August 1, 2020for 100% of the principal plus accrued interest and a discounted "make whole" payment. On or after August 1, 2020, the 6 ½% 2029 GO Zone Bonds are subject tooptional redemption by the Authority upon the direction of the Company for 100% of the principal plus accrued interest. The 6 ½% 2035 GO Zone Bonds and the6 ½% 2035 IKE Zone Bonds are subject to optional redemption by the Authority upon the direction of the Company at any time prior to November 1, 2020 for100% of the principal plus accrued interest and a discounted "make whole" payment. On or after November 1, 2020, the 6 ½% 2035 GO Zone Bonds and the 6 ½%2035 IKE Zone Bonds are subject to optional redemption by the Authority upon the direction of the Company for 100% of the principal plus accrued interest. SeeNote 11 to the consolidated financial statements included in Item 8 of this Form 10-K for more information.3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046In August 2016, we completed the private offering of $750 million aggregate principal amount of our 3.60% 2026 Senior Notes and $700 million aggregateprincipal amount of our 5.0% 2046 Senior Notes. In March 2017, the Company commenced registered exchange offers to exchange the 3.60% 2026 Senior Notesand the 5.0% 2046 Senior Notes for new notes that are identical in all material respects to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes, exceptthat the offer and issuance of the new Securities and Exchange Commission ("SEC")-registered notes have been registered under the Securities Act of 1933, asamended (the "Securities Act"). The exchange offers expired on April 24, 2017, and approximately 99.97% of the 3.60% 2026 Senior Notes and 100% of the 5.0%2046 Senior Notes were exchanged. The notes that were not exchanged in the exchange offers have not been registered under the Securities Act or any statesecurities laws and may not be offered or sold in the U.S. absent registration or an applicable exemption from registration requirements or a transaction not subjectto the registration requirements of the Securities Act or any state securities law.3.60% Senior Notes due 2022In July 2012, we issued $250 million aggregate principal amount of the 3.60% 2022 Senior Notes. We may optionally redeem the 3.60% 2022 Senior Notesat any time and from time to time prior to April 15, 2022 (three months prior to the maturity date) for 100% of the principal plus accrued interest and a discounted"make whole" payment. On or after April 15, 2022, we may optionally redeem the 3.60% 2022 Senior Notes for 100% of the principal plus accrued interest. Theholders of the 3.60% 2022 Senior Notes may require us to repurchase the 3.60% 2022 Senior Notes at a price of 101% of their principal amount, plus accrued andunpaid interest to the date of repurchase, upon the occurrence of both a "change of control" and, within 60 days of such change of control, a "below investmentgrade rating event" (as such terms are defined in the indenture governing the 3.60% 2022 Senior Notes).39Table of Contents4.375% Senior Notes due 2047In November 2017, we completed the registered public offering of $500 million aggregate principal amount of 4.375% Senior Notes due November 15,2047. We may optionally redeem the 4.375% 2047 Senior Notes at any time and from time to time prior to May 15, 2047 (six months prior to the maturity date)for 100% of the principal plus accrued interest and a discounted "make whole" payment. On or after May 15, 2047, we may optionally redeem the 4.375% 2047Senior Notes for 100% of the principal amount plus accrued interest. The holders of the 4.375% 2047 Senior Notes may require us to repurchase the 4.375% 2047Senior Notes at a price of 101% of their principal amount, plus accrued and unpaid interest to, but not including, the date of repurchase, upon the occurrence ofboth a "change of control" and, within 60 days of such change of control, a "below investment grade rating event" (as such terms are defined in the indenturegoverning the 4.375% 2047 Senior Notes). See Note 11 to the consolidated financial statements for more information.Revenue BondsIn December 1997, we entered into a loan agreement with a public trust established for public purposes for the benefit of the Parish of Calcasieu, Louisiana.The public trust issued $11 million principal amount of tax-exempt waste disposal revenue bonds in order to finance our construction of waste disposal facilities foran ethylene plant. The waste disposal revenue bonds expire in December 2027 and are subject to redemption and mandatory tender for purchase prior to maturityunder certain conditions. Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent and is payable quarterly. The interestrate on the waste disposal revenue bonds at December 31, 2019 and 2018 was 1.78% and 1.85%, respectively.1.625% Senior Notes due 2029In July 2019, we completed the registered public offering of €700 million aggregate principal amount of the 1.625% 2029 Senior Notes due July 17, 2029.The Company received approximately $779 million of net proceeds from the offering. We may optionally redeem the 1.625% 2029 Senior Notes at any time andfrom time to time prior to April 17, 2029 (three months prior to the maturity date) for 100% of the principal plus accrued interest and a discounted "make whole"payment. On or after April 17, 2029, we may optionally redeem the 1.625% 2029 Senior Notes for 100% of the principal amount plus accrued interest. The holdersof the 1.625% 2029 Senior Notes may require us to repurchase the 2029 Senior Notes at a price of 101% of their principal amount, plus accrued and unpaidinterest to the date of repurchase, upon the occurrence of both a "change of control" and, within 60 days of such change of control, a "below investment grade ratingevent" (as such terms are defined in the indenture and supplemental indenture governing the 1.625% 2029 Senior Notes).The indenture and supplemental indentures governing the 3.60% 2026 Senior Notes, 5.0% 2046 Senior Notes, 3.60% 2022 Senior Notes, 4.375% 2047Senior Notes and 1.625% 2029 Senior Notes contain customary events of default and covenants that will restrict us and certain of our subsidiaries' ability to (1)incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of its assets.As of December 31, 2019, we were in compliance with all of our long-term debt covenants.Westlake Chemical Partners LP Credit ArrangementsOur subsidiary, Westlake Chemical Finance Corporation, is the lender party to a $600 million revolving credit facility with Westlake Chemical Partners LP("Westlake Partners"), originally entered into on April 29, 2015. The revolving credit facility is scheduled to mature in April 2021. Borrowings under the revolverbear interest at LIBOR plus a spread ranging from 2.0% to 3.0% (depending on Westlake Partners' consolidated leverage ratio), payable quarterly. WestlakePartners may pay all or a portion of the interest on any borrowings in kind, in which case any such amounts would be added to the principal amount of the loan. Asof December 31, 2019, outstanding borrowings under the credit facility totaled $377 million and bore interest at the LIBOR rate plus 2.0%.Our subsidiary, Westlake Polymers LLC, is the administrative agent to a $600 million revolving credit facility with OpCo. The revolving credit facility isscheduled to mature in September 2023. As of December 31, 2019, outstanding borrowings under the credit facility totaled $23 million and bore interest at theLIBOR rate plus 2.0%, which is accrued in arrears quarterly.We consolidate Westlake Partners and OpCo for financial reporting purposes as we have a controlling financial interest. As such, the revolving creditfacilities described above between our subsidiaries and Westlake Partners and OpCo are eliminated upon consolidation.40Table of ContentsContractual Obligations and Commercial CommitmentsIn addition to long-term debt, we are required to make payments relating to various types of obligations. The following table summarizes our contractualobligations as of December 31, 2019 relating to long-term debt, operating leases, finance leases, pension benefits funding, post-retirement healthcare benefits,purchase obligations and interest payments for the next five years and thereafter. The amounts do not include deferred charges and other items classified in otherliabilities in the consolidated balance sheet due to the uncertainty of the future payment schedule. Payment Due by Period Total 2020 2021-2022 2023-2024 Thereafter (dollars in millions)Contractual Obligations Long-term debt $3,500 $— $250 $— $3,250Operating leases 545 106 152 98 189Finance leases 16 3 5 5 3Pension benefits funding 177 6 28 55 88Post-retirement healthcare benefits 93 8 16 15 54Purchase obligations 7,180 1,588 1,986 1,463 2,143Interest payments 2,198 131 258 244 1,565Asset retirement obligations 42 7 1 3 31Total $13,751 $1,849 $2,696 $1,883 $7,323Other Commercial Commitments Standby letters of credit $29 $23 $— $— $6Pension Benefits Funding. This represents the projected timing of contributions to our defined benefit pension plans which cover certain eligible employeesin the United States and non-U.S. countries.Post-retirement Healthcare Benefits. This represents the projected timing of contributions to our post-retirement healthcare benefits to the employees ofcertain subsidiaries who meet certain minimum age and service requirements.Purchase Obligations. Purchase obligations include agreements to purchase goods and services that are enforceable and legally binding and that specify allsignificant terms, including a minimum quantity and price. We are party to various obligations to purchase goods and services, including commitments to purchasevarious feedstock, utilities, nitrogen, oxygen, product storage, pipeline usage and logistic support, in each case in the ordinary course of our business, as well asvarious purchase commitments for our capital projects. The amounts shown in the table above reflect our estimates based on the contractual quantities and theprices in effect under contractual agreements as of December 31, 2019.Interest Payments. Interest payments are based on interest rates in effect at December 31, 2019.Asset Retirement Obligations. This includes the estimated costs and timing of payments to satisfy our recognized asset retirement obligations.Standby Letters of Credit. This includes (1) our obligation under an $11 million letter of credit issued in connection with the $11 million tax-exempt wastedisposal revenue bonds and (2) other letters of credit totaling $18 million issued primarily to support commercial obligations and obligations under our insuranceprograms, including workers' compensation claims.Uncertain Income Tax Positions. We have recognized a liability for our uncertain income tax positions of approximately $20 million as of December 31,2019. We do not believe we are likely to pay any material amounts during the year ending December 31, 2020. The ultimate resolution and timing of payment forremaining matters continues to be uncertain and are therefore excluded from the Contractual Obligations table above.Off-Balance Sheet ArrangementsNone.41Table of ContentsCritical Accounting PoliciesCritical accounting policies are those that are important to our financial condition and require management's most difficult, subjective or complexjudgments. Different amounts would be reported under different operating conditions or under alternative assumptions. We have evaluated the accounting policiesused in the preparation of the accompanying consolidated financial statements and related notes and believe those policies are reasonable and appropriate.We apply those accounting policies that we believe best reflect the underlying business and economic events, consistent with GAAP. Our more criticalaccounting policies include those related to long-lived assets, fair value estimates, accruals for long-term employee benefits, accounts receivable, income taxesand environmental and legal obligations. Inherent in such policies are certain key assumptions and estimates. We periodically update the estimates used in thepreparation of the financial statements based on our latest assessment of the current and projected business and general economic environment. Our significantaccounting policies are summarized in Note 1 to the consolidated financial statements appearing elsewhere in this Form 10-K. We believe the following to be ourmost critical accounting policies applied in the preparation of our financial statements.Long-Lived Assets. Key estimates related to long-lived assets include useful lives, recoverability of carrying values and existence of any retirementobligations. Such estimates could be significantly modified. The carrying values of long-lived assets could be impaired by significant changes or projected changesin supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors withsignificant raw material or other cost advantages, adverse changes associated with the United States and world economies, the cyclical nature of the chemical andrefining industries and uncertainties associated with governmental actions.We evaluate long-lived assets for potential impairment indicators whenever events or changes in circumstances indicate that the carrying amount of an assetmay not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Our judgments regarding the existenceof impairment indicators are based on legal factors, market conditions and the operational performance of our businesses. Actual impairment losses incurred couldvary significantly from amounts estimated. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largelyindependent of the cash flows of other assets and liabilities. Additionally, future events could cause us to conclude that impairment indicators exist and thatassociated long-lived assets of our businesses are impaired. Any resulting impairment loss could have a material adverse impact on our financial condition andresults of operations.The estimated useful lives of long-lived assets range from one to 40 years. Depreciation and amortization of these assets, including amortization of deferredturnaround costs, under the straight-line method over their estimated useful lives totaled $713 million, $641 million and $601 million in 2019, 2018 and 2017,respectively. If the useful lives of the assets were found to be shorter than originally estimated, depreciation or amortization charges would be accelerated.We defer the costs of planned major maintenance activities, or turnarounds, and amortize the costs over the period until the next planned turnaround of theaffected unit. Total costs deferred on turnarounds were $40 million, $79 million and $47 million in 2019, 2018 and 2017, respectively. Amortization in 2019, 2018and 2017 of previously deferred turnaround costs was $55 million, $39 million and $30 million, respectively. As of December 31, 2019, deferred turnaround costs,net of accumulated amortization, totaled $129 million. Expensing turnaround costs as incurred would likely result in greater variability of our quarterly operatingresults and would adversely affect our financial position and results of operations.Additional information concerning long-lived assets and related depreciation and amortization appears in Notes 6 and 8 to the consolidated financialstatements appearing elsewhere in this Form 10-K.Fair Value Estimates. We develop estimates of fair value to allocate the purchase price paid to acquire a business to the assets acquired and liabilitiesassumed in an acquisition, to assess impairment of long-lived assets, goodwill and intangible assets and to record marketable securities and pension plan assets.We use all available information to make these fair value determinations, including the engagement of third-party consultants. At December 31, 2019, our recordedgoodwill was $1,074 million. In addition, we record all pension plan assets and certain marketable securities at fair value. The fair value of these items isdetermined by quoted market prices or from observable market-based inputs. See Note 16 to the consolidated financial statements for more information.42Table of ContentsBusiness Combinations and Intangible Assets Including Goodwill. We account for business combinations using the acquisition method of accounting, andaccordingly, the assets and liabilities of the acquired business are recorded at their fair values at the date of acquisition. The excess of the purchase price over theestimated fair value is recorded as goodwill. Any changes in the estimated fair values of the net assets recorded for acquisitions prior to the finalization of moredetailed analysis, but not to exceed one year from the date of acquisition, will change the amount of the purchase price allocable to goodwill. Any subsequentchanges to any purchase price allocations that are material to our consolidated financial results will be adjusted in the same period's financial statements, includingthe effect on earnings of changes in depreciation, amortization or other income effects, if any, as a result of the change to the provisional amounts, calculated as ifthe accounting had been completed at the acquisition date. All acquisition costs are expensed as incurred and in-process research and development costs arerecorded at fair value as an indefinite-lived intangible asset and assessed for impairment thereafter until completion, at which point the asset is amortized over itsexpected useful life. Separately recognized transactions associated with business combinations are generally expensed subsequent to the acquisition date. Theapplication of business combination and impairment accounting requires the use of significant estimates and assumptions.Goodwill is evaluated for impairment at least annually, or when events or changes in circumstances indicate the fair value of a reporting unit with goodwillhas been reduced below its carrying value. We perform our annual impairment assessment for the Olefins and Vinyls reporting units in October and April,respectively. We may elect to perform an optional qualitative assessment to determine whether a quantitative impairment analysis is required. The qualitativeassessment considers factors such as macroeconomic conditions, industry and market considerations, cost factors related to raw materials and labor, current andprojected financial performance, changes in management or strategy, and market capitalization. Alternatively, we may unconditionally elect to bypass thequalitative assessment and perform a quantitative goodwill impairment assessment in any period.We elected to perform the quantitative assessment for both of our segments' reporting units during 2019. The quantitative analysis compares a reportingunit's fair value to its carrying amount to determine whether goodwill is impaired. The fair values of the reporting units are calculated using both a discounted cashflow methodology and a market value methodology. The discounted cash flow projections are based on a forecast to reflect the cyclicality of the business. Theforecast is based on historical results and estimates by management, including its strategic and operational plans, and financial performance of the market. Thefuture cash flows are discounted to present value using an applicable discount rate. The significant assumptions used in determining the fair value of the reportingunit using the market value methodology include the determination of appropriate market comparables and the estimated multiples of EBITDA a willing buyer islikely to pay. Even if the fair values of the reporting units decreased by 10% from the fair values determined in the most recent quantitative tests performed during2019, the carrying values of the reporting units would not have exceeded their fair values. See Item 1A, "Risk Factors—If our goodwill, indefinite-lived intangibleassets or other intangible assets become impaired in the future, we may be required to record non-cash charges to earnings, which could be significant."The results of operations of acquired businesses are included in our consolidated financial statements from the acquisition date.Long-Term Employee Benefit Costs. Our costs for long-term employee benefits, particularly pension and postretirement medical and life benefits, areincurred over long periods of time and involve many uncertainties over those periods. The net periodic benefit cost attributable to current periods is based onseveral assumptions about such future uncertainties and is sensitive to changes in those assumptions. It is our responsibility, often with the assistance ofindependent experts, to select assumptions that represent the best estimates of those uncertainties. It is also our responsibility to review those assumptionsperiodically and, if necessary, adjust the assumptions to reflect changes in economic or other factors.Accounting for employee retirement plans involves estimating the cost of benefits that are to be provided in the future and attempting to match, for eachemployee, that estimated cost to the period worked. To accomplish this, we rely extensively on advice from actuaries, and we make assumptions about inflation,investment returns, mortality, employee turnover and discount rates that ultimately impact amounts recorded. Changes in these assumptions may result in differentexpense and liability amounts. One of the more significant assumptions relates to the discount rate for measuring benefit obligations. At December 31, 2019, theprojected pension benefit obligations for U.S. and non-U.S. plans were calculated using assumed weighted average discount rates of 3.0% and 1.3%, respectively.The discount rates were determined using a benchmark pension discount curve and applying spot rates from the curve to each year of expected benefit payments todetermine the appropriate discount rate. As a result of the funding relief provided by the enactment of the Bipartisan Budget Act of 2015, no minimum fundingrequirements are expected during 2020 for the U.S. pension plans. Additional information on the 2020 funding requirements and key assumptions underlying thesebenefit costs appear in Note 14 to the consolidated financial statements appearing elsewhere in this Form 10-K.43Table of ContentsThe following table reflects the sensitivity of the benefit obligation of our pension plans to changes in the actuarial assumptions: 2019 U.S. Plans Non-U.S. Plans (dollars in millions)Projected benefit obligation, end of year $703 $144Discount rate increases by 100 basis points (75) (21)Discount rate decreases by 100 basis points 93 26A one-percentage point increase or decrease in assumed healthcare trend rates would not have a significant effect on the amounts reported for the healthcareplans.While we believe that the amounts recorded in the consolidated financial statements appearing elsewhere in this Form 10-K related to these retirement plansare based on the best estimates and judgments available, the actual outcomes could differ from these estimates.Income Taxes. We utilize the liability method of accounting for income taxes. Under the liability method, deferred tax assets or liabilities are recorded basedupon temporary differences between the tax basis of assets and liabilities and their carrying values for financial reporting purposes. Deferred tax expense or benefitis the result of changes in the deferred tax assets and liabilities during the period. Valuation allowances are recorded against deferred tax assets when it isconsidered more likely than not that the deferred tax assets will not be realized.Environmental and Legal Obligations. We consult with various professionals to assist us in making estimates relating to environmental costs and legalproceedings. We accrue an expense when we determine that it is probable that a liability has been incurred and the amount is reasonably estimable. While webelieve that the amounts recorded in the accompanying consolidated financial statements related to these contingencies are based on the best estimates andjudgments available, the actual outcomes could differ from our estimates. Additional information about certain legal proceedings and environmental mattersappears in Note 22 to the consolidated financial statements appearing elsewhere in this Form 10-K.Asset Retirement Obligations. We recognize asset retirement obligations in the period in which the liability becomes probable and reasonably estimable.Initially, the asset retirement obligation is recorded at fair value and capitalized as a component of the carrying value of the long-lived asset to which the obligationrelates. The liability is recorded at its future value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Uponsettlement of the liability, a gain or loss is recorded. We have conditional asset retirement obligations for the removal and disposal of hazardous materials fromcertain of our manufacturing facilities.We also have conditional asset retirement obligations that have not been recognized because the fair values of the conditional legal obligations cannot bemeasured due to the indeterminate settlement date of the obligations. Settlements of the unrecognized conditional asset retirement obligations are not expected tohave a material adverse effect on our financial condition, results of operations or cash flows in any individual reporting period.Recent Accounting PronouncementsSee Note 1 to the consolidated financial statements included in Item 8 of this Form 10-K for a full description of recent accounting pronouncements,including expected dates of adoption and estimated effects on results of operations and financial condition.Item 7A. Quantitative and Qualitative Disclosures about Market RiskCommodity Price RiskA substantial portion of our products and raw materials are commodities whose prices fluctuate as market supply and demand fundamentals change.Accordingly, product margins and the level of our profitability tend to fluctuate with changes in the business cycle. We try to protect against such instabilitythrough various business strategies. Our strategies include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls productswhere pricing is more stable. We use derivative instruments in certain instances to reduce price volatility risk on feedstocks and products. Based on our openderivative positions on ethane at December 31, 2019, a hypothetical $0.10 increase in the price of a gallon of ethane would have increased our income beforeincome taxes by $11 million. Based on our open derivative positions on ethylene (which are related to OpCo's third party sales), at December 31, 2019, ahypothetical $0.10 decrease in the price of a pound of ethylene would have increased our income before income taxes by $9 million.44Table of ContentsInterest Rate RiskWe are exposed to interest rate risk with respect to fixed and variable rate debt. At December 31, 2019, we had $3,489 million aggregate principal amount offixed rate debt. We are subject to the risk of higher interest cost if and when this debt is refinanced. If interest rates were 1.0% higher at the time of refinancing, ourannual interest expense would increase by approximately $35 million. Also, at December 31, 2019, we had $11 million principal amount of variable rate debtoutstanding, which represents the tax exempt waste disposal revenue bonds. We do not currently hedge our variable interest rate debt, but we may do so in thefuture. The average variable interest rate for our variable rate debt of $11 million as of December 31, 2019 was 1.78%. A hypothetical 100 basis point increase inthe average interest rate on our variable rate debt would not result in a material change in the interest expense.LIBOR is used as a reference rate for borrowings under our revolving line of credit, which is currently undrawn. LIBOR is set to be phased out at the end of2021. We are currently reviewing how the LIBOR phase out will affect us, but we do not expect the impact to be material.Foreign Currency Exchange Rate RiskWe are exposed to foreign currency exchange rate risk associated with our international operations. However, the effect of fluctuations in foreign currencyexchange rates caused by our international operations has not had a material impact on our overall operating results. We may engage in activities to mitigate ourexposure to foreign currency exchange risk in certain instances through the use of currency exchange derivative instruments, including forward exchange contracts,cross-currency swaps or spot purchases. A forward exchange contract obligates us to exchange predetermined amounts of specified currencies at a stated exchangerate on a stated date. A cross-currency swap obligates us to make periodic payments in the local currency and receive periodic payments in our functional currencybased on the notional amount of the instrument. In January 2018, we entered into foreign exchange hedging contracts designated as net investment hedges with anaggregate notional value of €220 million designed to reduce the volatility in stockholders' equity from changes in currency exchange rates associated with our netinvestments in foreign operations. In July 2019, we terminated a portion of the foreign exchange hedging contract with a notional value of €70 million. Thenotional value of the remaining net investment hedges was €150 million at December 31, 2019. The arrangement is scheduled to mature in 2026.In July 2019, we completed the registered public offering of €700 million aggregate principal amount of the 1.625% Senior Notes. We designated this euro-denominated debt as a non-derivative net investment hedge of a portion of our net investments in euro functional-currency denominated subsidiaries to offsetforeign currency fluctuations.45Table of ContentsItem 8. Financial Statements and Supplementary DataIndex to Consolidated Financial Statements Page Management's Report on Internal Control over Financial Reporting47Report of Independent Registered Public Accounting Firm48Consolidated Financial Statements: Consolidated Balance Sheets as of December 31, 2019 and 201851Consolidated Statements of Operations for the Years Ended December 31, 2019, 2018 and 201752Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2019, 2018 and 201753Consolidated Statements of Changes in Stockholders' Equity for the Years Ended December 31, 2019, 2018 and 201754Consolidated Statements of Cash Flows for the Years Ended December 31, 2019, 2018 and 201755Notes to Consolidated Financial Statements56Financial statement schedules not included in this Form 10-K have been omitted because they are not applicable or because the required information isshown in the financial statements or notes thereto.46Table of ContentsMANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTINGThe management of Westlake Chemical Corporation is responsible for establishing and maintaining adequate internal control over financial reporting.Westlake's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance with generally accepted accounting principles.Westlake management assessed the effectiveness of the Company's internal control over financial reporting as of December 31, 2019. In making thisassessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control—IntegratedFramework (2013). Based on its assessment, Westlake's management has concluded that the Company's internal control over financial reporting was effective asof December 31, 2019 based on those criteria.PricewaterhouseCoopers LLP, the independent registered public accounting firm that audited the financial statements included in this Annual Report onForm 10-K, has also audited the effectiveness of internal control over financial reporting as of December 31, 2019 as stated in their report that appears on thefollowing page.47Table of ContentsReport of Independent Registered Public Accounting FirmTo the Board of Directors and Stockholders of Westlake Chemical CorporationOpinions on the Financial Statements and Internal Control over Financial ReportingWe have audited the accompanying consolidated balance sheets of Westlake Chemical Corporation and its subsidiaries (the "Company") as of December 31, 2019and 2018, and the related consolidated statements of operations, of comprehensive income, of changes in stockholders' equity and of cash flows for each of thethree years in the period ended December 31, 2019, including the related notes (collectively referred to as the "consolidated financial statements"). We also haveaudited the Company's internal control over financial reporting as of December 31, 2019, based on criteria established in Internal Control - Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission ("COSO").In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December31, 2019 and 2018, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2019 in conformity withaccounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internalcontrol over financial reporting as of December 31, 2019, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.Change in Accounting Principle As discussed in Note 1 to the consolidated financial statements, the Company changed the manner in which it accounts for leases in 2019.Basis for OpinionsThe Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and forits assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control overFinancial Reporting. Our responsibility is to express opinions on the Company's consolidated financial statements and on the Company's internal control overfinancial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States)("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules andregulations of the Securities and Exchange Commission and the PCAOB.We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonableassurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internalcontrol over financial reporting was maintained in all material respects.Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financialstatements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significantestimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financialreporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing andevaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as weconsidered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.Definition and Limitations of Internal Control over Financial ReportingA company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financialreporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactionsand dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financialstatements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance withauthorizations of management and directors of the48Table of Contentscompany; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assetsthat could have a material effect on the financial statements.Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation ofeffectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance withthe policies or procedures may deteriorate.Critical Audit MattersThe critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated orrequired to be communicated to the audit committee and that (i) relates to accounts or disclosures that are material to the consolidated financial statements and (ii)involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on theconsolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the criticalaudit matter or on the accounts or disclosures to which it relates.Goodwill impairment assessment for the North America Vinyls reporting unitAs described in Notes 1 and 8 to the consolidated financial statements, the Company's Vinyls segment goodwill balance was $1,044 million as of December 31,2019, which includes the goodwill balance associated with the North America Vinyls reporting unit. Management performs its annual impairment assessment forthe Vinyls reporting units in April, including the North America Vinyls reporting unit. The quantitative analysis compares the reporting unit's fair value to itscarrying amount to determine whether goodwill is impaired. The fair value of the North America Vinyls reporting unit assessed during the April 2019 impairmenttest was calculated using both a discounted cash flow methodology and a market value methodology. The discounted cash flow projections were based on a nine-year forecast. The forecast was based on prices and spreads projected by third party industry publications, historical results, and estimates by management,including its strategic and operational plans. Significant assumptions used in the discounted cash flow projection included projected sales volumes based onproduction capacities. The future cash flows were discounted to present value using a discount rate. Significant assumptions used in determining the fair value ofthe reporting unit using the market value methodology included the determination of market comparables and the estimated multiples of net income before interestexpense, income taxes, depreciation and amortization ("EBITDA") a willing buyer is likely to pay.The principal considerations for our determination that performing procedures relating to the goodwill impairment assessment for the North America Vinylsreporting unit is a critical audit matter are there was significant judgment by management when developing the fair value estimate of this reporting unit. This in turnled to a high degree of auditor judgment, subjectivity, and effort in performing procedures and evaluating the significant assumptions used in management'sdiscounted cash flow and market value methodologies, including projected sales volumes, discount rate, determination of market comparables and the estimatedmultiples of EBITDA. In addition, the audit effort involved the use of professionals with specialized skill and knowledge to assist in evaluating the audit evidenceobtained from these procedures.49Table of ContentsAddressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financialstatements. These procedures included testing the effectiveness of controls relating to the goodwill impairment assessment for the Company's reporting units,including controls over measurement of the fair value of the North America Vinyls reporting unit. These procedures also included, among others, testingmanagement's process for developing the fair value estimate; evaluating the appropriateness of the discounted cash flow and market value methodologies; testingthe completeness, accuracy, and relevance of underlying data used in the model; and evaluating the significant assumptions used by management, includingprojected sales volumes, discount rate, determination of market comparables and the estimated multiples of EBITDA. When assessing the assumptions related toprojected sales volumes, market comparables, and estimated multiples of EBITDA, we evaluated whether the assumptions used by management were reasonableconsidering (i) the current and past performance of the reporting unit, (ii) the consistency with external market and industry data, and (iii) whether theseassumptions were consistent with evidence obtained in other areas of the audit. Professionals with specialized skill and knowledge were used to assist in evaluatingthe appropriateness of the Company's discounted cash flow and market value methodologies and certain significant assumptions, including the discount rate./s/PricewaterhouseCoopers LLPHouston, TexasFebruary 19, 2020We have served as the Company's auditor since 1986, which includes periods before the Company became subject to SEC reporting requirements.50Table of ContentsWESTLAKE CHEMICAL CORPORATIONCONSOLIDATED BALANCE SHEETS December 31, 2019 2018 (in millions of dollars, exceptpar values and share amounts)ASSETS Current assets Cash and cash equivalents $728 $753Accounts receivable, net 1,036 1,037Inventories 936 1,014Prepaid expenses and other current assets 42 38Total current assets 2,742 2,842Property, plant and equipment, net 6,912 6,595Operating lease right-of-use assets 443 —Goodwill 1,074 1,002Customer relationships, net 523 525Other intangible assets, net 187 134Equity method investments 1,112 253Other assets, net 268 251Total assets $13,261 $11,602LIABILITIES AND EQUITY Current liabilities Accounts payable $473 $507Accrued and other liabilities 768 676Total current liabilities 1,241 1,183Long-term debt, net 3,445 2,668Deferred income taxes 1,255 1,159Pension and other post-retirement benefits 360 337Operating lease liabilities 355 —Other liabilities 202 179Total liabilities 6,858 5,526Commitments and contingencies (Note 22) Stockholders' equity Preferred stock, $0.01 par value, 50,000,000 shares authorized; no sharesissued and outstanding — —Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and134,651,380 shares issued at December 31, 2019 and 2018, respectively 1 1Common stock, held in treasury, at cost; 6,266,609 and 6,183,125 sharesat December 31, 2019 and 2018, respectively (377) (382)Additional paid-in capital 553 556Retained earnings 5,757 5,477Accumulated other comprehensive loss (74) (62)Total Westlake Chemical Corporation stockholders' equity 5,860 5,590Noncontrolling interests 543 486Total equity 6,403 6,076Total liabilities and equity $13,261 $11,602The accompanying notes are an integral part of these consolidated financial statements.51Table of ContentsWESTLAKE CHEMICAL CORPORATIONCONSOLIDATED STATEMENTS OF OPERATIONS Year Ended December 31, 2019 2018 2017 (in millions of dollars,except share amounts and per share data)Net sales $8,118 $8,635 $8,041Cost of sales 6,858 6,648 6,280Gross profit 1,260 1,987 1,761Selling, general and administrative expenses 458 445 399Amortization of intangibles 109 101 108Restructuring, transaction and integration-related costs 37 33 29Income from operations 656 1,408 1,225Other income (expense) Interest expense (124) (126) (159)Other income, net 38 52 15Income before income taxes 570 1,334 1,081Provision for (benefit from) income taxes 108 300 (258)Net income 462 1,034 1,339Net income attributable to noncontrolling interests 41 38 35Net income attributable to Westlake Chemical Corporation $421 $996 $1,304Earnings per common share attributable to Westlake Chemical Corporation: Basic $3.26 $7.66 $10.05Diluted $3.25 $7.62 $10.00Weighted average common shares outstanding Basic 128,395,184 129,401,823 129,087,043Diluted 128,757,293 129,985,753 129,540,013The accompanying notes are an integral part of these consolidated financial statements.52Table of ContentsWESTLAKE CHEMICAL CORPORATIONCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Year Ended December 31, 2019 2018 2017 (in millions of dollars)Net income $462 $1,034 $1,339Other comprehensive income (loss), net of income taxes Pension and other post-retirement benefits Pension and other post-retirement benefits reserves adjustment (32) (33) 19Amortization of benefits liability — — 2Income tax benefit (provision) on pension and other post-retirement benefits 8 8 (7)Foreign currency translation adjustments Foreign currency translation 17 (59) 124Income tax provision on foreign currency translation (4) — (5)Other comprehensive income (loss), net of income taxes (11) (84) 133Comprehensive income 451 950 1,472Comprehensive income attributable to noncontrolling interests,net of tax of $2, $4 and $1 for 2019, 2018 and 2017, respectively 42 36 40Comprehensive income attributable to Westlake Chemical Corporation $409 $914 $1,432The accompanying notes are an integral part of these consolidated financial statements.53Table of ContentsWESTLAKE CHEMICAL CORPORATIONCONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Common Stock Common Stock,Held in Treasury Number ofShares Amount Number ofShares At Cost AdditionalPaid-inCapital RetainedEarnings AccumulatedOtherComprehensive Income (Loss) NoncontrollingInterests Total (in millions of dollars, except share amounts)Balances atDecember 31,2016 134,651,380 $1 5,726,377 $(319) $551 $3,412 $(121) $368 $3,892Net income — — — — — 1,304 — 35 1,339Othercomprehensiveincome — — — — — — 128 5 133Shares issued—stock-basedcompensation — — (493,502) 17 (6) — — — 11Stock-basedcompensation — — — — 14 — — — 14Dividendsdeclared — — — — — (103) — — (103)Distributions tononcontrollinginterests — — — — — — — (28) (28)Issuance ofWestlakeChemicalPartners LPcommon units — — — — (4) — — 115 111Balances atDecember 31,2017 134,651,380 1 5,232,875 (302) 555 4,613 7 495 5,369Cumulative effectof accountingchange — — — — — 1 — — 1Reclassificationof certain taxeffects toretainedearnings — — — — — (13) 13 — —Net income — — — — — 996 — 38 1,034Othercomprehensiveloss — — — — — — (82) (2) (84)Common stockrepurchased — — 1,368,881 (106) — — — — (106)Shares issued—stock-basedcompensation — — (418,631) 26 (17) — — — 9Stock-basedcompensation — — — — 18 — — — 18Dividendsdeclared — — — — — (120) — — (120)Distributions tononcontrollinginterests — — — — — — — (45) (45)Balances atDecember 31,2018 134,651,380 1 6,183,125 (382) 556 5,477 (62) 486 6,076Net income — — — — — 421 — 41 462Othercomprehensiveincome (loss) — — — — — — (12) 1 (11)Common stockrepurchased — — 517,712 (30) — — — — (30)Shares issued—stock-basedcompensation — — (434,228) 35 (25) (9) — — 1Stock-basedcompensation — — — — 24 — — 24Dividendsdeclared — — — — — (132) — — (132)Distributions tononcontrollinginterests — — — — — — — (50) (50)Issuance ofWestlakeChemicalPartners LPcommon units — — — — (2) — — 65 63Balances atDecember 31,2019 134,651,380 $1 6,266,609 $(377) $553 $5,757 $(74) $543 $6,403The accompanying notes are an integral part of these consolidated financial statements.54Table of ContentsWESTLAKE CHEMICAL CORPORATIONCONSOLIDATED STATEMENTS OF CASH FLOWS Year Ended December 31, 2019 2018 2017 (in millions of dollars)Cash flows from operating activities Net income $462 $1,034 $1,339Adjustments to reconcile net income to net cash provided by operating activities Depreciation and amortization 713 641 601Stock-based compensation expense 25 22 23Loss from disposition and write-off of property, plant and equipment 49 44 22Deferred income taxes 54 62 (534)Other losses (gains), net 1 (20) (3)Changes in operating assets and liabilities, net of effect of business acquisitions Accounts receivable 59 (58) (40)Inventories 112 (123) (32)Prepaid expenses and other current assets (1) (1) 26Accounts payable (89) (100) 86Accrued and other liabilities (13) (8) 115Other, net (71) (84) (75)Net cash provided by operating activities 1,301 1,409 1,528Cash flows from investing activities Acquisition of businesses, net of cash acquired (314) — (13)Additions to property, plant and equipment (787) (702) (577)Additions to investments in unconsolidated subsidiaries (862) (68) (66)Other, net 9 16 4Net cash used for investing activities (1,954) (754) (652)Cash flows from financing activities Dividends paid (132) (120) (103)Distributions to noncontrolling interests (50) (45) (28)Proceeds from debt issuance, net 784 — —Proceeds from notes payable 20 14 978Net proceeds from issuance of Westlake Chemical Partners LP common units 63 — 111Repayment of term loan — — (150)Repayment of revolver — — (550)Redemption and repayment of notes payable (18) (1,179) (257)Repurchase of common stock for treasury (30) (106) —Other (7) 9 5Net cash provided by (used for) financing activities 630 (1,427) 6Effect of exchange rate changes on cash, cash equivalents and restricted cash (2) (7) 26Net increase (decrease) in cash, cash equivalents and restricted cash (25) (779) 908Cash, cash equivalents and restricted cash at beginning of the year 775 1,554 646Cash, cash equivalents and restricted cash at end of the year $750 $775 $1,554The accompanying notes are an integral part of these consolidated financial statements.55Table of ContentsWESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS(in millions of dollars, except share amounts and per share data)1. Description of Business and Significant Accounting PoliciesDescription of BusinessWestlake Chemical Corporation (the "Company") operates as an integrated global manufacturer and marketer of basic chemicals, vinyls, polymers andbuilding products. These products include some of the most widely used chemicals in the world, which are fundamental to many diverse consumer and industrialmarkets, including flexible and rigid packaging, automotive products, coatings, residential and commercial construction as well as other durable and non-durablegoods. The Company's customers range from large chemical processors and plastics fabricators to small construction contractors, municipalities and supplywarehouses primarily throughout North America and Europe. The petrochemical industry is subject to price fluctuations and volatile feedstock pricing typical of acommodity-based industry, the effects of which may not be immediately passed along to customers.Westlake Chemical Partners LPIn 2014, the Company formed Westlake Chemical Partners LP ("Westlake Partners") to operate, acquire and develop ethylene production facilities andrelated assets. Westlake Partners' assets consist of a limited partner interest in Westlake Chemical OpCo LP ("OpCo"), as well as the general partner interest inOpCo. OpCo's assets include two ethylene production facilities at the Company's Lake Charles, Louisiana site, one ethylene production facility at the Company'sCalvert City, Kentucky site and a 200-mile common carrier ethylene pipeline that runs from Mont Belvieu, Texas to the Company's Longview, Texas site. As ofDecember 31, 2019, the Company held a 77.2% limited partner interest in OpCo and a controlling interest in Westlake Partners. The operations of WestlakePartners are consolidated in the Company's financial statements.Principles of ConsolidationThe consolidated financial statements include the accounts of the Company and subsidiaries in which the Company directly or indirectly owns more than a50% voting interest and exercises control and, when applicable, entities for which the Company has a controlling financial interest or is the primary beneficiary.Investments in majority-owned companies where the Company does not exercise control and investments in nonconsolidated affiliates (20%-50% ownedcompanies, joint ventures and partnerships) are accounted for using the equity method of accounting. Undistributed earnings from joint ventures included inretained earnings were immaterial as of December 31, 2019. All intercompany transactions and balances are eliminated in consolidation.Certain reclassifications have been made to the prior-year financial statements to conform to the current-year presentation.Noncontrolling interests represent the direct equity interests held by investors in the Company's consolidated subsidiaries, Westlake Partners, TaiwanChlorine Industries, Ltd. and Suzhou Huasu Plastics Co., Ltd.Cash and Cash EquivalentsCash equivalents consist of highly liquid investments that are readily convertible into cash and have a maturity of three months or less at the date ofacquisition.Concentration of Credit RiskFinancial instruments which potentially subject the Company to concentration of risk consist principally of trade receivables from customers engaged inmanufacturing polyethylene products, polyvinyl chloride ("PVC") products and PVC pipe products. The Company performs periodic credit evaluations of thecustomers' financial condition and generally does not require collateral. The Company maintains allowances for potential losses.Allowance for Doubtful AccountsThe determination of the allowance for doubtful accounts is based on estimation of the amount of accounts receivable that the Company believes are unlikelyto be collected. Estimating this amount requires analysis of the financial strength of the Company's customers, the use of historical experience, the Company'saccounts receivable aged trial balance, and specific collectibility analysis. The allowance for doubtful accounts is reviewed quarterly. Past due balances over 90days and high risk accounts as determined by the analysis of financial strength of customers are reviewed individually for collectibility.56Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)InventoriesInventories primarily include product, material and supplies. Inventories are stated at lower of cost or net realizable value. Cost is determined using the first-in, first-out ("FIFO") or average method.Property, Plant and EquipmentProperty, plant and equipment are carried at cost, net of accumulated depreciation. Cost includes expenditures for improvements and betterments that extendthe useful lives of the assets and interest capitalized on significant capital projects. Capitalized interest was $9, $7 and $4 for the years ended December 31, 2019,2018 and 2017, respectively. Repair and maintenance costs are charged to operations as incurred. Gains and losses on the disposition or retirement of fixed assetsare reflected in the consolidated statement of operations when the assets are sold or retired.Depreciation is provided by utilizing the straight-line method over the estimated useful lives of the assets as follows:Classification YearsBuildings and improvements 40Plant and equipment 10-25Other 3-15Impairment of Long-Lived AssetsThe Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may notbe recoverable. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cashflows of other assets and liabilities. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future netundiscounted cash flows expected to be generated by the asset. Assets are considered to be impaired if the carrying amount of an asset exceeds the futureundiscounted cash flows. The impairment recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets.Assets to be disposed of are reported at the lower of the carrying amount or estimated fair value less costs to sell.Impairment of Goodwill and Intangible AssetsGoodwill is tested for impairment at least annually, or when events or changes in circumstances indicate the fair value of a reporting unit with goodwill hasbeen reduced below its carrying value. The Company performed its annual impairment tests for the Olefins and Vinyls segments' goodwill in October 2019 andApril 2019, respectively, and the impairment tests indicated that the recorded goodwill was not impaired. There has been no impairment of the Olefins or Vinylssegments' goodwill since the goodwill was initially recorded. Other intangible assets with finite lives are amortized over their estimated useful lives and reviewedfor impairment in accordance with the provisions of the accounting guidance. See Note 8 for more information on the Company's annual goodwill impairmenttests.57Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Equity Method InvestmentsThe Company accounts for investments using the equity method of accounting if the Company has the ability to exercise significant influence over, but notcontrol of, an investee. Significant influence generally exists if the Company has an ownership interest representing between 20% and 50% of the voting rights.Under the equity method of accounting, investments are stated initially at cost and are adjusted for subsequent additional investments and the proportionate shareof profit or losses and distributions. The Company records its share of the profits or losses of the equity investments, net of income taxes, in the consolidatedstatements of income. The equity method investments are evaluated for impairment when events or changes in circumstances indicate, in management's judgment,that the carrying value of such investments may have experienced an other-than-temporary decline in value. When evidence of loss in value has occurred,management compares the estimated fair value of investment to the carrying value of investment to determine whether an impairment has occurred. If the estimatedfair value is less than the carrying value and management considers the decline in value to be other-than-temporary, the excess of the carrying value over theestimated fair value is recognized in the consolidated financial statements as an impairment.Other Assets, netOther assets, net include turnaround costs, investments in unconsolidated subsidiaries, restricted cash, deferred charges and other long-term assets.The Company accounts for turnaround costs under the deferral method. Turnarounds are the scheduled and required shutdowns of specific operating units inorder to perform planned major maintenance activities. The costs related to the significant overhaul and refurbishment activities include maintenance materials,parts and direct labor costs. The costs of the turnaround are deferred when incurred at the time of the turnaround and amortized (within depreciation andamortization) on a straight-line basis until the next planned turnaround, which ranges from three to six years. Deferred turnaround costs are presented as acomponent of other assets, net. The cash outflows related to these costs are included in operating activities in the consolidated statement of cash flows.Business CombinationsThe Company records business combinations using the acquisition method of accounting. Under the acquisition method of accounting, identifiable assetsacquired and liabilities assumed are recorded at their acquisition date fair values. The excess of the purchase price over the estimated fair value is recorded asgoodwill. Changes in the estimated fair values of net assets recorded for acquisitions prior to the finalization of more detailed analysis, but not to exceed one yearfrom the date of acquisition, will adjust the amount of the purchase price allocable to goodwill. Measurement period adjustments are reflected in the period inwhich they occur.Income TaxesThe Company utilizes the liability method of accounting for deferred income taxes. Under the liability method, deferred tax assets or liabilities are recordedbased upon temporary differences between the tax basis of assets and liabilities and their carrying values for financial reporting purposes. Deferred tax expense orbenefit is the result of changes in the deferred tax assets and liabilities during the period. Valuation allowances are recorded against deferred tax assets when it isconsidered more likely than not that the deferred tax assets will not be realized.On December 22, 2017, the United States ("U.S.") Tax Cuts and Jobs Act (the "Tax Act") was signed into law. The Tax Act, among other changes, reducedthe U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018, and also required a one-time deemed repatriation of foreign earnings at specifiedrates. The Company provisionally recognized a $591 income tax benefit in the 2017 consolidated financial statements that was primarily comprised of therevaluation of deferred tax assets and liabilities partially offset by a one-time U.S. tax on the mandatory deemed repatriation of the Company's post-1986 foreignearnings. The Company did not record any material measurement period adjustment in 2018. The Company's accounting for the income tax effects of the Tax Actwas completed in 2018.58Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)In February 2018, the FASB issued an accounting standards update, Income Statement—Reporting Comprehensive Income, to (1) allow reclassification fromaccumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Act; and (2) require certain disclosures aboutstranded tax effects. Certain tax effects become stranded in accumulated other comprehensive income (loss) when deferred tax balances originally recorded at thehistorical income tax rate are adjusted in income from operations based on the lower, newly-enacted income tax rate. The Company adopted the accountingstandard effective October 1, 2018 and reclassified $13 of stranded tax effects relating to its pension benefits liability and cumulative effect of foreign exchangefrom accumulated other comprehensive income (loss) to retained earnings.As a result of the Tax Act, the Financial Accounting Standards Board ("FASB") concluded that Global Intangible Low-Taxed Income Tax ("GILTI tax") canbe recognized in the financial statements, no later than December 22, 2018, per an accounting policy choice, by: (1) recording a period cost (permanent item) or (2)providing deferred income taxes stemming from certain basis differences that are expected to result in GILTI tax. The Company elected to record GILTI tax as aperiod cost. The GILTI tax recognized in 2019 and 2018 were not material to the consolidated financial statements.Foreign Currency TranslationAssets and liabilities of foreign subsidiaries are translated to U.S. dollars at the exchange rate as of the end of the year. Statement of operations items aretranslated at the average exchange rate for the year. The resulting translation adjustment is recorded as a separate component of stockholders' equity.Revenue RecognitionRevenue is recognized when the Company transfers control of inventories to its customers. Amounts recognized as revenues reflect the consideration towhich the Company expects to be entitled in exchange for those inventories. Provisions for discounts, rebates and returns are incorporated in the estimate ofvariable consideration and reflected as reduction to revenue in the same period as the related sales.Control of inventories generally transfers upon shipment for domestic sales. The Company excludes taxes collected on behalf of customers from theestimated contract price. For export contracts, the point at which control passes to the customer varies depending on the terms specified in the customer contract.The Company generally invoices customers and recognizes revenue and accounts receivable upon transferring control of inventories. In limitedcircumstances, the Company transfers control of inventories shortly before it has an unconditional right to receive consideration, resulting in recognition ofcontract assets. The Company also receives advance payments from certain customers, resulting in recognition of contract liabilities. Contract assets and liabilitiesare generally settled within the period and are not material to the consolidated balance sheets. The Company expenses sales commissions when incurred. Thesecosts are recorded within selling, general and administrative expenses. Aside from the amounts disclosed within Note 9, the Company does not disclose the valueof unsatisfied performance obligations because its contracts with customers (1) have an original expected duration of one year or less or (2) have only variableconsideration that is calculated based on market prices at specified dates and is allocated to wholly unsatisfied performance obligations.The Company adopted ASU No. 2014-09, Revenue from Contracts with Customers ("ASC 606"), effective January 1, 2018. The Company applied themodified retrospective transition method to all contracts that were not completed as of the adoption date. Periods prior to January 1, 2018 were not adjusted and arereported under the accounting standards that were in place during those periods. The cumulative effects of changes to the Company's consolidated January 1, 2018balance sheet for the adoption of this accounting standard were immaterial.The impact of ASC 606 adoption on the financial statements for the year ended December 31, 2018 as compared with the guidance that was in effect prior toJanuary 1, 2018 was immaterial.ASC 606 requires disclosure of disaggregated revenue into categories that depict the nature of how the Company's revenue and cash flows are affected byeconomic factors. The Company discloses revenues by product and segment in Note 23.Prior to the adoption of ASC 606, the revenue was recognized when persuasive evidence of an arrangement existed, products were delivered to the customer,the sales price was fixed or determinable and collectability was reasonably assured. For domestic contracts, title and risk of loss had passed to the customer upondelivery under executed customer purchase orders or contracts. For export contracts, the title and risk of loss had passed to customers at the time specified by eachcontract.59Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Transportation and FreightAmounts billed to customers for freight and handling costs on outbound shipments are included in net sales in the consolidated statements of operations.Transportation and freight costs incurred by the Company on outbound shipments are included in cost of sales in the consolidated statements of operations.Price Risk ManagementThe Company recognizes derivative instruments on the balance sheet at fair value, and changes in a derivative's fair value are currently recognized inearnings or comprehensive income, depending on the designation of the derivative. If the derivative is designated as a fair value hedge, the changes in the fair valueof the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effectiveportion of the change in the fair value of the derivative is recorded in comprehensive income and is recognized in the statement of operations when the hedged itemaffects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in earnings currently. The derivative instruments did not havea material impact on the Company's consolidated financial statements.Asset Retirement ObligationsThe Company has conditional asset retirement obligations for the removal and disposal of hazardous materials from certain of the Company's manufacturingfacilities.The Company recognizes asset retirement obligations in the period in which the liability becomes probable and reasonably estimable. Recognized assetretirement obligations are initially recorded at fair value and capitalized as a component of the carrying value of the long-lived asset to which the obligation relates.The liability is accreted to its future value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Upon settlement ofthe liability, a gain or loss is recorded. As of December 31, 2019, the Company had $7 and $20 of asset retirement obligations recorded as accrued liabilities andother liabilities, respectively. As of December 31, 2018, the Company had $8 and $20 of asset retirement obligations recorded as accrued liabilities and otherliabilities, respectively.The Company also has conditional asset retirement obligations that have not been recognized because the fair values of the conditional legal obligationscannot be measured due to the indeterminate settlement date of the obligations. Settlements of the unrecognized conditional asset retirement obligations are notexpected to have a material adverse effect on the Company's financial condition, results of operations or cash flows in any individual reporting period.Environmental CostsEnvironmental costs relating to current operations are expensed or capitalized, as appropriate, depending on whether such costs provide future economicbenefits. Remediation liabilities are recognized when the costs are considered probable and can be reasonably estimated. Measurement of liabilities is based oncurrently enacted laws and regulations, existing technology and undiscounted site-specific costs. Environmental liabilities in connection with properties that aresold or closed are realized upon such sale or closure, to the extent they are probable and estimable and not previously reserved. Recognition of any joint andseveral liabilities is based upon the Company's best estimate of its final pro rata share of the liability.Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management tomake estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities.Actual results could differ from those estimates.60Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Recent Accounting PronouncementsCredit Losses (ASU No. 2016-13)In June 2016, the Financial Accounting Standards Board ("FASB") issued an accounting standards update providing new guidance for the accounting forcredit losses on loans and other financial instruments. The new guidance introduces an approach based on expected losses to estimate credit losses on tradereceivables, debt securities and certain types of financial instruments. The standard also modifies the impairment model for available-for-sale debt securities andprovides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. In November 2019, the FASB issuedadditional authoritative guidance related to credit losses. The accounting standard is effective for reporting periods beginning after December 15, 2019 and is notexpected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.Intangibles - Goodwill and Other (ASU No. 2017-04)In January 2017, the FASB issued an accounting standards update to simplify the subsequent measurement of goodwill. The guidance removes Step 2 of thegoodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit'scarrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The accounting standard will be effective for reporting periods beginning afterDecember 15, 2019 and is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.Fair Value Measurement (ASU No. 2018-13)In August 2018, the FASB issued an accounting standards update to modify the disclosure requirements on fair value measurements. The amendments areeffective for periods beginning after December 15, 2019. An entity is permitted to early adopt any removed or modified disclosures and delay adoption of theadditional disclosures until the effective date. Most amendments should be applied retrospectively, but certain amendments will be applied prospectively. TheCompany is in the process of assessing the impact of the standard on the Company's fair value disclosures. However, the standard is not expected to have an impacton the Company's consolidated financial position, results of operations and cash flows.Income Taxes (ASU No. 2019-12)In December 2019, the FASB issued an accounting standards update removing certain exceptions for investments, intraperiod allocations and interimcalculations and adding guidance to reduce complexity in accounting for income taxes. The accounting standard will be effective for reporting periods beginningafter December 15, 2020. Early adoption of this guidance is permitted. The Company is in the process of evaluating the impact that the new accounting guidancewill have on its consolidated financial position, results of operations and cash flows.Recently Adopted Accounting StandardsLeases (ASU No. 2016-02)In February 2016, the FASB issued an accounting standards update on lease accounting that supersedes the previously issued lease guidance. The newstandard requires lessees to recognize assets and liabilities for all long-term operating leases. An asset is recognized for the right to use an underlying leased assetand a liability is recognized for the obligation to make payments over the lease term. The standard also requires expanded lease disclosures. The standard requires amodified retrospective adoption approach and allows for the election of certain transition expedients.The Company adopted the standard on January 1, 2019 using the optional transition method, which allows entities to recognize a cumulative adjustment tothe opening balance sheet in the period of adoption. The Company elected the package of optional transition expedients and was not required to reassess (1)whether any existing contracts are or contain leases, (2) classification of existing leases as operating or capital or (3) whether initial direct costs for existing leasesqualify for capitalization under the new accounting standard. The Company did not elect the use of hindsight to determine the lease term when considering leaserenewal or termination options. Additionally, the Company elected to continue accounting for existing land easements under its accounting policies that were ineffect prior to adoption of the new lease standard. The following amounts were recorded as a result of adopting the new lease standard on January 1, 2019:61Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Operating Lease Assets and Liabilities Balance Sheet Location Amounts Recorded inthe ConsolidatedBalance Sheet January1, 2019Right-of-use assets Operating lease right-of-use assets $421Current lease liabilities Accrued and other liabilities (94)Non-current lease liabilities Operating lease liabilities (331)Deferred rent Other liabilities 42. AcquisitionNAKANTM On January 2, 2019, the Company acquired all of the outstanding equity interests in the parent entity of the NAKANTM global compounding solutionsbusiness. NAKAN's products are used in a wide-variety of applications, including in the automotive, building and construction, and medical industries.The closing purchase price of $249 was paid with available cash on hand. The acquisition is being accounted for under the acquisition method of accounting.The assets acquired and liabilities assumed and the results of operations of NAKAN are included in the Vinyls segment.NAKAN's net sales and earnings since the acquisition date were not material to the Company's consolidated statement of operations for the year endedDecember 31, 2019. The acquisition-related costs recognized in the consolidated statement of operations for the year ended December 31, 2019 were not material.The pro forma impact of this acquisition has not been presented as it is not material to the Company's consolidated statements of operations for the years endedDecember 31, 2019 and 2018.The following table summarizes the fair value of identified assets acquired and liabilities assumed at the date of acquisition. The allocation of considerationtransferred is based on management's estimates, judgments and assumptions. When determining the fair values of assets acquired and liabilities assumed,management made significant estimates, judgments and assumptions. Management estimated that consideration paid exceeded the fair value of the net assetsacquired. Therefore, goodwill of $40 was recorded. The goodwill recognized is primarily attributable to the expected value to be achieved from the acquisition. Theinformation below represents the purchase price allocation:62Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Cash $10Accounts receivable 53Inventories 40Prepaid expenses and other current assets 7Property, plant and equipment 75Operating lease right-of-use assets 3Intangible assets: Customer relationships (weighted average lives of 17 years) 65Technology (weighted average lives of 14 years) 40Trade name (life of 15 years) 25Other assets 12Total assets acquired 330Accounts payable 57Accrued and other liabilities 18Deferred income taxes 31Pension and other post-retirement benefits 4Operating lease liabilities 3Other long-term liabilities 8Total liabilities assumed 121Total identifiable net assets acquired 209Goodwill 40Total purchase consideration $2493. Financial InstrumentsCash EquivalentsThe Company had $240 and $10 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debtsecurities, classified as cash equivalents at December 31, 2019 and 2018, respectively. The Company's investments in held-to-maturity securities were held atamortized cost, which approximates fair value.Restricted Cash and Cash EquivalentsThe Company had restricted cash and cash equivalents of $22 and $22 at December 31, 2019 and 2018, respectively. The Company's restricted cash and cashequivalents are primarily related to balances that are restricted for payment of distributions to certain of the Company's current and former employees and arereflected primarily in other assets, net in the consolidated balance sheets.4. Accounts ReceivableAccounts receivable consist of the following at December 31: 2019 2018Trade customers $948 $969Related parties 12 6Allowance for doubtful accounts (22) (23) 938 952Federal and state taxes 59 57Other 39 28Accounts receivable, net $1,036 $1,0375. InventoriesInventories consist of the following at December 31: 2019 2018Finished products $568 $657Feedstock, additives, chemicals and other raw materials 210 203Materials and supplies 158 154Inventories $936 $1,0146. Property, Plant and EquipmentProperty, plant and equipment consist of the following at December 31: 2019 2018Land $198 $193Buildings and improvements 608 544Plant and equipment 8,227 7,568Other 496 437 9,529 8,742Less: Accumulated depreciation (3,168) (2,720) 6,361 6,022Construction in progress 551 573Property, plant and equipment, net $6,912 $6,595Depreciation expense on property, plant and equipment of $519, $478 and $449 is included primarily in cost of sales in the consolidated statements ofoperations for the years ended December 31, 2019, 2018 and 2017, respectively.7. LeasesThe Company is obligated under various long-term and short-term operating leases for rail cars, buildings, land and other transportation and storage assets.The Company determines whether an arrangement is, or contains, a lease at contract inception. Some of the Company's arrangements contain both lease and non-lease components. For certain transportation equipment leases, the Company accounts for the lease and non-lease components as a single lease component. TheCompany records right-of-use assets and corresponding lease liabilities for operating leases with terms greater than one year. Operating lease right-of-use assetsand liabilities are recorded at the present value of the fixed lease payments over the life of the lease. The majority of the Company's leases do not provide animplicit rate. Therefore, the Company uses its incremental borrowing rate at lease commencement to measure operating lease right-of-use assets and leaseliabilities. Certain of the Company's leases provide for renewal and purchase options. Renewal and purchase options are evaluated at lease commencement andincluded in the lease term if they are reasonably certain to be exercised. Short-term leases are recognized in rental expense on a straight-line basis over the leaseterm and are not recorded in the consolidated balance sheets. The Company's finance leases are not material to the consolidated financial statements.63Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Lease-related asset and liability balances were as follows: December 31, 2019Operating Leases Right-of-use assets $443 Accrued and other liabilities $93Operating lease liabilities 355Total operating lease liabilities $448 Weighted Average Remaining Term (in years) 8Weighted Average Lease Discount Rate 3.5%The Company's operating lease cost is comprised of payments related to operating leases recorded in the consolidated balance sheet and short-term rentalpayments for leases that are not recorded in the consolidated balance sheet. Variable operating lease cost was not material to the consolidated statement ofoperations for the years ended December 31, 2019 and 2018. The components of operating lease expense were as follows: December 31, 2019Operating lease cost (1) $113Short-term lease cost 58Total operating lease cost $171_____________________________(1)Includes fixed lease payments for operating leases recorded in the consolidated balancesheet.Maturities of lease liabilities were as follows at December 31, 2019: Operating Leases2020 $1062021 832022 692023 552024 43Thereafter 189Total lease payments 545Less: imputed interest (97)Present value of lease liabilities $448Future lease commitments for operating lease obligations were as follows at December 31, 2018: Operating Leases2019 $942020 892021 702022 562023 42Thereafter 152Total lease payments $50364Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Related Party LeasesThe Company leases certain assets under operating leases with related parties. As of December 31, 2019, right-of-use assets and the associated operatinglease liabilities for related party operating leases were approximately $50. The Company recognized operating lease cost for fixed lease payments to related partiesof $18 for the year ended December 31, 2019.8. Goodwill and Other Intangible AssetsGoodwillThe gross carrying amounts and changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 are as follows: Olefins Segment Vinyls Segment TotalBalance at December 31, 2017 $30 $982 $1,012Effects of changes in foreign exchange rates — (10) (10)Balance at December 31, 2018 30 972 1,002Goodwill acquired during the year — 67 67Effects of changes in foreign exchange rates — 5 5Balance at December 31, 2019 $30 $1,044 $1,074Olefins Segment GoodwillThe Company performed its annual impairment analysis for the Olefins segment, the reporting unit assessed, during the fourth quarter of 2019. The fair valueof the Olefins segment reporting unit assessed during the October 2019 impairment analysis was determined using both a discounted cash flow methodology and amarket value methodology. Based upon this assessment, the Company determined that the fair value of the Olefins segment reporting unit was greater than thecarrying value.The discounted cash flow projections were based on a nine-year forecast, from 2020 to 2028, to reflect the cyclicality of the Company's Olefins business. Theforecast was based on prices and spreads projected by IHS Markit ("IHS"), a chemical industry organization offering market and business advisory services for thechemical market, historical results and estimates by management, including its strategic and operational plans. Other significant assumptions used in thediscounted cash flow projection included projected sales volumes based on production capacities. The future cash flows were discounted to present value using adiscount rate of 9.5%. The significant assumptions used in determining the fair values of the reporting units using the market value methodology included thedetermination of appropriate market comparables and the estimated multiples of EBITDA a willing buyer was likely to pay.Vinyls Segment GoodwillThe Company performed its annual impairment analysis for the Vinyls reporting units during the second quarter of 2019. The fair values of the NorthAmerica and other reporting units assessed during the April 2019 impairment analysis were determined using both a discounted cash flow methodology and amarket value methodology. Based upon this assessment, the Company determined that the fair values of the Vinyls reporting units were greater than their carryingvalue.The discounted cash flow projections were based on a nine-year forecast, from 2020 to 2028 to reflect the cyclicality of the housing and construction marketsas the Company's Vinyls businesses are significantly influenced by those markets. The forecast was based on prices and spreads projected by IHS, historical resultsand estimates by management, including its strategic and operational plans. Other significant assumptions used in the discounted cash flow projection includedprojected sales volumes based on production capacities. The future cash flows were discounted to present value using a discount rate ranging from 9% to 12.5%.The significant assumptions used in determining the fair values of the reporting units using the market value methodology include the determination of appropriatemarket comparables and the estimated multiples of EBITDA a willing buyer is likely to pay.Intangible AssetsIntangible assets consisted of the following at December 31: 2019 2018 WeightedAverageLife Cost AccumulatedAmortization Net Cost AccumulatedAmortization Net Customer relationships $832 $(309) $523 $745 $(220) $525 11Other intangible assets: Licenses and intellectualproperty 172 (79) 93 122 (65) 57 13Trademarks 120 (37) 83 90 (26) 64 13Other 35 (24) 11 35 (22) 13 10Total other intangible assets $327 $(140) $187 $247 $(113) $134 Scheduled amortization of intangible assets for the next five years is as follows: $120, $117, $104, $57 and $51 in 2020, 2021, 2022, 2023 and 2024,respectively.9. Equity Method InvestmentsLACC, LLC Joint VentureIn 2015, Eagle US 2 LLC ("Eagle"), a wholly-owned subsidiary of the Company, and Lotte Chemical USA Corporation, a subsidiary of Lotte ChemicalCorporation ("Lotte"), formed a joint venture, LACC, LLC ("LACC"), to design, build and operate an ethylene facility with 2.2 billion pounds per year of ethyleneproduction capacity. Pursuant to a contribution and subscription agreement between Eagle and LACC, Eagle contributed $225 to LACC to fund construction costsof the ethylene plant, representing approximately 12% of the membership interests in LACC.On November 12, 2019, we, through Eagle, completed the acquisition of an additional 34.8% of the membership interests in LACC from Lotte forapproximately $817. As of December 31, 2019, the Company's investment exceeded the underlying equity in net assets by approximately $166 which wasassigned to goodwill and not amortized.The ethylene plant was built adjacent to the Company's chlor-alkali facility in Lake Charles. During the third quarter of 2019, the ethylene plant begancommercial operations.The Company accounts for its investment in LACC under the equity method of accounting. The LACC joint venture is a cost-sharing arrangement betweenthe members of LACC. The members of LACC receive their proportionate shares of ethylene offtake each month and fund cash operating costs, excludingdepreciation and amortization. As a result, LACC recognizes net losses equal to depreciation and amortization each period. The Company's equity in losses fromLACC, which is equal to its share of depreciation and amortization expenses, is recognized in cost of sales in the consolidated statements of operations. TheCompany's investment in LACC is recorded as a component of equity method investments in the consolidated balance sheets. The Company's capital contributionsto fund its share of capital expenditures are classified within investing activities in the consolidated statements of cash flows.The Company's ethylene offtake from LACC was approximately 215 million pounds during the year ended December 31, 2019.Changes in the Company's investment in LACC for the year ended December 31, 2019 were as follows: Investment in LACCBalance at December 31, 2018$183Cash contributions45Additional interest purchased817Depreciation and amortization(7)Balance at December 31, 2019$1,03865Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Services Provided to LACC and LotteThe Company provides certain utilities and other services to LACC and Lotte. Pursuant to a construction and reimbursement agreement, LACC and Lotteagreed to reimburse the Company for construction costs over a 6.5-year period beginning in 2020. In addition to the reimbursements for construction costs, theCompany charges LACC and Lotte certain fixed fees under an operating, maintenance and logistics agreement. The Company accounts for the reimbursement ofconstruction costs and the fixed fees as components of the total transaction price and recognizes it ratably in net sales over approximately 25 years. The remainingperformance obligations at December 31, 2019, representing these fixed components of the transaction price, totaled $59 and $81 from LACC and Lotte,respectively. As of December 31, 2019, the associated contract liabilities recorded totaled $5 and $7 from LACC and Lotte, respectively. There were no suchcontract liabilities recorded as of December 31, 2018. In addition to the reimbursements for construction costs and other fixed fees, the Company charges LACCand Lotte certain variable fees.Other Equity Method InvestmentsIn addition to LACC, the Company has other equity method investments amounting to $74 and $70 as of December 31, 2019 and 2018, respectively. SeeNote 20 for more detailed information.10. Accounts PayableAccounts payable consist of the following: December 31, 2019 December 31, 2018Accounts payable—third parties $435 $504Accounts payable to related parties 12 2Notes payable 26 1Accounts payable $473 $50766Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)11. Long-Term DebtLong-term debt consisted of the following at December 31: December 31, 2019 December 31, 2018 PrincipalAmount UnamortizedDiscount and DebtIssuance Costs Net Long-TermDebt PrincipalAmount UnamortizedDiscount and DebtIssuance Costs Net Long-TermDebt3.60% senior notes due 2022 (the "3.60% 2022Senior Notes") $250 $(1) $249 $250 $(1) $2493.60% senior notes due 2026 (the "3.60% 2026Senior Notes") 750 (8) 742 750 (9) 741Loan related to tax-exempt waste disposal revenuebonds due 2027 11 — 11 11 — 116 ½% senior notes due 2029 (the "6 ½% 2029 GOZone Senior Notes") 100 (1) 99 100 (1) 996 ½% senior notes due 2035 (the "6 ½% 2035GO Zone Senior Notes") 89 (1) 88 89 (1) 886 ½% senior notes due 2035 (the "6 ½% 2035IKE Zone Senior Notes") 65 — 65 65 — 655.0% senior notes due 2046 (the "5.0% 2046 SeniorNotes") 700 (23) 677 700 (24) 6764.375% senior notes due 2047 (the "4.375% 2047Senior Notes") 500 (9) 491 500 (9) 4913.50% senior notes due 2032 (the "3.50% 2032 GOZone Refunding Senior Notes") 250 (1) 249 250 (2) 2481.625% senior notes due 2029 (the "1.625% 2029Senior Notes") 785 (11) 774 — — —Long-term debt $3,500 $(55) $3,445 $2,715 $(47) $2,668Credit AgreementOn July 24, 2018, the Company entered into a new $1,000 revolving credit facility that is scheduled to mature on July 24, 2023 (the "Credit Agreement")and, in connection therewith, terminated the existing $1,000 revolving credit facility that was scheduled to mature on August 23, 2021 (the "Prior CreditAgreement"). The Credit Agreement bears interest at either (a) LIBOR plus a spread ranging from 1.00% to 1.75% or (b) Alternate Base Rate plus a spreadranging from 0.00% to 0.75% in each case depending on the credit rating of the Company. At December 31, 2019, the Company had no borrowings outstandingunder the Credit Agreement. As of December 31, 2019, the Company had no outstanding letters of credit and borrowing availability of $1,000 under the CreditAgreement. The Credit Agreement contains certain affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant.As of December 31, 2019, the Company was in compliance with the total leverage ratio financial maintenance covenant. The Credit Agreement also containscertain events of default and if and for so long as certain events of default have occurred and are continuing, any overdue amounts outstanding under the CreditAgreement will accrue interest at an increased rate, the lenders can terminate their commitments thereunder and payments of any outstanding amounts could beaccelerated by the lenders. None of the Company's subsidiaries are required to guarantee the obligations of the Company under the Credit Agreement.The Credit Agreement includes a $150 sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under thefacility. The Credit Agreement also provides for a discretionary $50 commitment for swingline loans to be provided on a same-day basis. The Company may alsoincrease the size of the facility, in increments of at least $25, up to a maximum of $500, subject to certain conditions and if certain lenders agree to commit to suchan increase.3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046In August 2016, the Company issued $750 aggregate principal amount of the 3.60% 2026 Senior Notes and $700 aggregate principal amount of the 5.0%2046 Senior Notes. In March 2017, the Company commenced registered exchange67Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)offers to exchange the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes for new notes that are identical in all material respects to the 3.60% 2026 SeniorNotes and the 5.0% 2046 Senior Notes, except that the offer and issuance of the new Securities and Exchange Commission ("SEC")-registered notes have beenregistered under the Securities Act of 1933, as amended (the "Securities Act"). The exchange offers expired on April 24, 2017, and approximately 99.97% of the3.60% 2026 Senior Notes and 100% of the 5.0% 2046 Senior Notes were exchanged. The 3.60% 2026 Senior Notes that were not exchanged in the 3.60% 2026Senior Notes exchange offer have not been registered under the Securities Act or any state securities laws and may not be offered or sold in the U.S. absentregistration or an applicable exemption from registration requirements or a transaction not subject to the registration requirements of the Securities Act or any statesecurities law.3.60% Senior Notes due 2022In July 2012, the Company issued $250 aggregate principal amount of the 3.60% 2022 Senior Notes. The 3.60% 2022 Senior Notes are unsecured and wereissued with an original issue discount of $1. There is no sinking fund and no scheduled amortization of the 3.60% 2022 Senior Notes prior to maturity. TheCompany may optionally redeem the 3.60% 2022 Senior Notes in accordance with the terms of the 3.60% 2022 Senior Notes.4.375% Senior Notes due 2047In November 2017, the Company completed the registered public offering of $500 aggregate principal amount of the 4.375% 2047 Senior Notes. The4.375% 2047 Senior Notes are unsecured and mature on November 15, 2047. There is no sinking fund and no scheduled amortization of the 4.375% 2047 SeniorNotes prior to maturity. The Company may optionally redeem the 4.375% 2047 Senior Notes in accordance with the terms of the 4.375% 2047 Senior Notes.1.625% Senior Notes due 2029On July 17, 2019, the Company completed the registered public offering of €700 aggregate principal amount of 1.625% Senior Notes due July 17, 2029 (the"1.625% 2029 Senior Notes"). The Company received approximately $779 of net proceeds from the offering. The 1.625% 2029 Senior Notes will accrue interestfrom July 17, 2019 at a rate of 1.625% per annum, payable annually in arrears on July 17 of each year, beginning July 17, 2020. The Company designated thiseuro-denominated debt as a non-derivative net investment hedge of a portion of the Company's net investments in euro functional-currency denominatedsubsidiaries to offset foreign currency fluctuations.The indenture and supplemental indentures governing the 3.60% 2026 Senior Notes, 5.0% 2046 Senior Notes, 3.60% 2022 Senior Notes, 4.375% 2047Senior Notes and 1.625% Senior Notes contain customary events of default and covenants that will restrict the Company and certain of the Company's subsidiaries'ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of itsassets.IKE Zone BondsIn December 2010, the Louisiana Local Government Authority Environmental Facilities and Community Development Authority (the "Authority"), apolitical subdivision of the State of Louisiana, completed the offering of $65 of 6 ½% IKE Zone Bonds under Section 704 of the Emergency EconomicStabilization Act of 2008 (the "IKE Zone Act"). In connection with the issuance of the 6 ½% 2035 IKE Zone Bonds, the Company issued $65 of the 6 ½% 2035IKE Zone Senior Notes.GO Zone BondsIn December 2010, the Authority issued $89 of 6 ½% tax-exempt revenue bonds due November 1, 2035 under the Gulf Opportunity Zone Act of 2005 (the"GO Zone Act") (the "6 ½% 2035 GO Zone Bonds"). In connection with the issuance of the 6 ½% 2035 GO Zone Bonds, the Company issued $89 of the 6 ½%2035 GO Zone Senior Notes. In July 2010, the Authority completed the reoffering of $100 of 6 ½% tax-exempt revenue bonds due August 1, 2029 under the GOZone Act (the "6 ½% 2029 GO Zone Bonds"). In connection with the reoffering of the 6 ½% 2029 GO Zone Bonds, the Company issued $100 of the 6 ½% 2029GO Zone Senior Notes.Each series of the tax-exempt bonds is subject to redemption and the holders may require the bonds to be repurchased upon a change of control or a changein or loss of the current tax status of the bonds. In addition, the bonds are subject to optional redemption by the Authority upon the direction of the Company ifcertain events have occurred in connection with the operation of the projects for which the bond proceeds may be used, including if the Company has determinedthat the continued operation of any material portion of the projects would be impracticable, uneconomical or undesirable for any reason.68Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)In November 2017, the Authority completed the remarketing of $250 aggregate principal amount of 3.50% tax-exempt revenue refunding bonds dueNovember 1, 2032 (the "3.50% 2032 GO Zone Bonds"). In connection with the remarketing of the 3.50% 2032 GO Zone Bonds, the Company issued $250 of the3.50% 2032 Senior Notes. The 3.50% 2032 GO Zone Bonds are subject to optional redemption by the Authority upon the direction of the Company at any time onor after November 1, 2027, for 100% of the principal amount plus accrued interest. The indenture governing the 3.50% 2032 Senior Notes contains customaryevents of default and covenants that will restrict the Company and certain of the Company's subsidiaries' ability to (1) incur certain secured indebtedness, (2)engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all of substantially all of its assets.In connection with each offering of the tax-exempt bonds, the Company entered into a loan agreement with the Authority pursuant to which the Companyagreed to pay all of the principal, premium, if any, and interest on the bonds and certain other amounts to the Authority. The net proceeds from the offerings wereloaned by the Authority to the Company. The Company used the proceeds to expand, refurbish and maintain certain of its facilities in the Louisiana Parishes ofCalcasieu and Ascension. The bonds are unsecured and rank equally in right of payment with other existing and future unsecured senior indebtedness. As ofDecember 31, 2019, the Company had drawn all proceeds from the tax-exempt bonds. In connection with each such offering of the tax-exempt bonds, theCompany issued senior notes under a base indenture and supplemental indenture to collateralize its obligations under the loan agreement relating to such tax-exempt bonds (collectively, the "Tax-Exempt Bond Related Senior Notes").The indentures governing the Tax-Exempt Bond Related Senior Notes excluding the 3.5% 2032 GO Zone Refunding Senior Notes contain customarycovenants and events of default. Accordingly, these agreements generally impose significant operating and financial restrictions on the Company. Theserestrictions, among other things, provide limitations on incurrence of additional indebtedness, the payment of dividends, certain investments and acquisitions andsales of assets. However, the effectiveness of certain of these restrictions is currently suspended because the Tax-Exempt Bond Related Senior Notes are currentlyrated investment grade by at least two nationally recognized credit rating agencies. The most significant of these provisions, if it were currently effective, wouldrestrict the Company from incurring additional debt, except specified permitted debt (including borrowings under its credit facility), when the Company's fixedcharge coverage ratio is below 2.0:1. These limitations are subject to a number of important qualifications and exceptions, including, without limitation, anexception for the payment of the Company's regular quarterly dividend of up to $0.10 per share. If the restrictions were currently effective, distributions in excessof $100 would not be allowed unless, after giving pro forma effect to the distribution, the Company's fixed charge coverage ratio is at least 2.0:1 and suchpayment, together with the aggregate amount of all other distributions after January 13, 2006, is less than the sum of 50% of the Company's consolidated netincome for the period from October 1, 2003 to the end of the most recent quarter for which financial statements have been filed, plus 100% of net cash proceedsreceived after October 1, 2003 as a contribution to the Company's common equity capital or from the issuance or sale of certain securities, plus several otheradjustments.Revenue BondsIn December 1997, the Company entered into a loan agreement with a public trust established for public purposes for the benefit of the Parish of Calcasieu,Louisiana. The public trust issued $11 principal amount of tax-exempt waste disposal revenue bonds in order to finance the Company's construction of wastedisposal facilities for an ethylene plant. The waste disposal revenue bonds expire in December 2027 and are subject to redemption and mandatory tender forpurchase prior to maturity under certain conditions. The interest rate on the waste disposal revenue bonds at December 31, 2019 and 2018 was 1.78% and 1.85%,respectively.As of December 31, 2019, the Company was in compliance with all of its long-term debt covenants.The weighted average interest rate on all long-term debt was 3.6% and 4.4% at December 31, 2019 and 2018, respectively. Unamortized debt issuance costson long-term debt were $30 and $25 at December 31, 2019 and 2018, respectively.Aggregate scheduled maturities of long-term debt during the next five years consist of $250 in 2022. There are no other scheduled maturities of debt in 2020through 2024.12. Stockholders' EquityThe Company's Board of Directors has declared regular quarterly dividends to holders of its common stock aggregating $132, $120 and $103 for the yearsended December 31, 2019, 2018 and 2017, respectively.Common StockEach share of common stock entitles the holder to one vote on all matters on which holders are permitted to vote, including the election of directors. Thereare no cumulative voting rights. Accordingly, holders of a majority of the total votes entitled to vote in an election of directors will be able to elect all of thedirectors standing for election. Subject to preferences that may be applicable to any outstanding preferred stock, the holders of the common stock will shareequally on a per share basis any dividends when, as and if declared by the Board of Directors out of funds legally available for that purpose. If the Company isliquidated, dissolved or wound up, the holders of the Company's common stock will be entitled to a ratable share of any distribution to stockholders, aftersatisfaction of all the Company's liabilities and of the prior rights of any outstanding class of the Company's preferred stock. The Company's common stock has nopreemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the Company's common stock.Preferred StockThe Company's charter authorizes the issuance of shares of preferred stock. The Company's Board of Directors has the authority, without shareholderapproval, to issue preferred shares from time to time in one or more series, and to fix the number of shares and terms of each such series. The Board may determinethe designations and other terms of each series including dividend rates, whether dividends will be cumulative or non-cumulative, redemption rights, liquidationrights, sinking fund provisions, conversion or exchange rights and voting rights.Stock Repurchase ProgramIn November 2014, the Company's Board of Directors approved a $250 share repurchase program (the "2014 Program"). In November 2015, the Company'sBoard of Directors approved the expansion of the 2014 Program by an additional $150. In August 2018, the Company's Board of Directors approved theexpansion of the 2014 Program by an additional $150. The number of shares repurchased by the Company under the 2014 Program was 517,712, 1,368,881 and 0for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, the Company had repurchased a total of 6,080,191 shares of itscommon stock for an aggregate purchase price of approximately $365.Any shares repurchased under the 2014 Program are held by the Company as treasury stock and may be used for general corporate purposes, including forthe 2013 Omnibus Incentive Plan. In 2014, the Company began delivering treasury shares to employees and non-employee directors for options exercised and forthe settlement of restricted stock units. The cost of treasury shares delivered is determined using the specific identification method.13. Accumulated Other Comprehensive Income (Loss)Changes in accumulated other comprehensive income (loss) by component were as follows: Pension and Other Post-Retirement BenefitsLiability, Net of Tax Cumulative ForeignCurrencyExchange, Net of Tax TotalBalances at December 31, 2017 $43 $(36) $7Other comprehensive income (loss) before reclassifications (14) (57) (71)Amounts reclassified from accumulated other comprehensive income (loss) (11) — (11)Reclassification of certain tax effects to retained earnings (1) 9 4 13Net other comprehensive loss attributable to Westlake Chemical Corporation (16) (53) (69)Balances at December 31, 2018 27 (89) (62)Other comprehensive income (loss) before reclassifications (24) 12 (12)Amounts reclassified from accumulated other comprehensive income (loss) — — —Net other comprehensive income (loss) attributable to Westlake ChemicalCorporation (24) 12 (12)Balances at December 31, 2019 $3 $(77) $(74)69Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)______________________________(1)In 2018, the Company reclassified certain income tax effects to retained earnings upon adoption of ASU No. 2018-02. See Note 1 (Income taxes) foradditional information.The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidatedstatements of operations:Details about Accumulated Other ComprehensiveIncome (Loss) Components Location of Reclassification(Income (Expense)) inConsolidated Statementsof Operations Year Ended December 31, 2019 2018 2017Amortization of pension and other post-retirement net loss (1) $— $— $(2)Pension settlement gain (1) — 14 —Income tax benefit (provision) on pension andother post-retirement benefits Provision for (benefit from) income taxes — (3) —Total reclassifications for the period $— $11 $(2)______________________________(1)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and reflected in other income,net in the consolidated statements of operations. See Note 14 for additional information on the pension settlement gain recognized in 2018.14. Employee BenefitsDefined Contribution PlansU.S. PlansThe Company has a defined contribution savings plan covering the eligible U.S. regular full-time and part-time employees, whereby eligible employees mayelect to contribute up to 100% of their annual eligible compensation, subject to an annual plan limit in line with the annual elective contribution limit asdetermined by the Internal Revenue Service. The Company matches its employee's contribution up to a certain percentage of such employee's compensation, perthe terms of the plan. The Company may, at its discretion and per the terms of the plan, make an additional non-matching contribution in an amount as the Boardof Directors may determine. For the years ended December 31, 2019, 2018 and 2017, the Company recorded approximately $20, $21 and $23, respectively, toexpense for these contributions.Further, within the plan, the Company also makes an annual retirement contribution to substantially all employees of certain subsidiaries. The Company'scontributions to the plan are determined as a percentage of employees' pay. For the years ended December 31, 2019, 2018 and 2017, the Company chargedapproximately $32, $31 and $29, respectively, to expense for these contributions.Non-U.S. PlansThe Company has defined contribution plans in several countries covering eligible employees of the Company. The Company's contributions to the plans arebased on applicable laws in each country. Contributions to the Company's non-U.S. defined contribution plans are made by both the employee and the Company.For the years ended December 31, 2019, 2018 and 2017, the Company charged approximately $4, $5 and $5, respectively, to expense for its contributions to theseplans.Defined Benefit PlansU.S. PlansThe Company has noncontributory defined benefit pension plans that cover certain eligible salaried and wage employees of certain subsidiaries. However,eligibility for the Company's plans has been frozen. Benefits for salaried employees under these plans are based primarily on years of service and employees' paynear retirement. Benefits for wage employees are based upon years of service and a fixed amount as periodically adjusted. The Company recognizes the years ofservice prior to the Company's acquisition of the subsidiary's facilities for purposes of determining vesting, eligibility and benefit levels for certain employees ofthe subsidiary and for determining vesting and eligibility for certain other employees of the subsidiary. The measurement date for these plans is December 31.Non-U.S. PlansThe Company has defined benefit pension plans covering current and former employees associated with the Company's operations. These pension plans areclosed to new participants. Benefits for employees for these plans are based primarily on employees' pay near retirement. These pension plans are unfunded andhave no plan assets. The measurement date for the non-U.S. plans is December 31.Details of the changes in benefit obligations, plan assets and funded status of the Company's pension plans are as follows: 2019 2018 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. PlansChange in benefit obligation Benefit obligation, beginning of year $648 $136 $807 $142Service cost 3 2 3 2Interest cost 23 3 24 3Actuarial loss (gain) 80 14 (43) —Benefits paid (51) (4) (40) (4)Plan amendments — (4) — —Settlements — (1) (103) —Foreign exchange effects — (2) — (7)Benefit obligation, end of year $703 $144 $648 $136 Change in plan assets Fair value of plan assets, beginning of year $486 $17 $650 $18Actual return 92 1 (22) —Employer contribution 2 — 3 1Benefits paid (51) — (40) (1)Administrative expenses paid (3) — (2) —Settlements — — (103) —Foreign exchange effects — 1 — (1)Fair value of plan assets, end of year $526 $19 $486 $17Funded status, end of year $(177) $(125) $(162) $(119) 2019 2018 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. PlansAmounts recognized in the consolidated balance sheet atDecember 31 Current liabilities $(2) $(2) $(2) $(3)Noncurrent liabilities (175) (123) (160) (116)Net amount recognized $(177) $(125) $(162) $(119)70Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data) 2019 2018 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. PlansAmounts recognized in accumulated other comprehensive income(loss) Net loss (gain) $(16) $22 $(36) $9Prior service cost — (4) — —Total before tax (1) $(16) $18 $(36) $9______________________________(1)After-tax totals for pension benefits were $0 and $22 for 2019 and 2018, respectively, and are reflected in stockholders' equity as accumulated othercomprehensive income (loss).In the U.S., the Pension Protection Act of 2006 (the "Pension Protection Act") established a relationship between a qualified pension plan's funded statusand the actual benefits that can be provided. Restrictions on plan benefits and additional funding and notice requirements are imposed when a plan's funded statusis less than certain threshold levels. For the 2019 plan year, the funded status for the Company's U.S. pension plans are above 80% and, as such, are exempt fromthe Pension Protection Act's benefit restrictions.Pension plans with an accumulated benefit obligation in excess of plan assets at December 31 are as follows: 2019 2018 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. PlansInformation for pension plans with an accumulated benefitobligation in excess of plan assets Projected benefit obligation $(703) $(143) $(648) $(128)Accumulated benefit obligation (703) (138) (648) (125)Fair value of plan assets 526 18 486 1071Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)The following table provides the components of net periodic benefit costs, other changes in plan assets and benefit obligation recognized in othercomprehensive income. Year Ended December 31, 2019 2018 2017 U.S.Plans Non-U.S.Plans U.S.Plans Non-U.S.Plans U.S.Plans Non-U.S.PlansComponents of net periodic benefit cost Service cost $3 $2 $3 $2 $3 $2Administrative expenses 4 — 3 — 2 —Interest cost 23 3 24 3 25 2Expected return on plan assets (33) (1) (42) (1) (40) (1)Net amortization — — (1) 1 1 1Settlement gain — — (14) — — —Net periodic benefit cost (gain) $(3) $4 $(27) $5 $(9) $4 Other changes in plan assets and benefit obligationrecognized in other comprehensive income (OCI) Net loss (gain) emerging $20 $13 $20 $1 $(18) $—Settlement gain — — 14 — — —Effect of plan change — (4) — — — —Amortization of net gain (loss) — — 1 (1) (1) (1)Total recognized in OCI $20 $9 $35 $— $(19) $(1)Total net periodic benefit cost and OCI $17 $13 $8 $5 $(28) $3The estimated prior service cost and net loss for the defined benefit plans to be amortized from accumulated other comprehensive income (loss) into netperiodic benefit cost during 2020 are expected to be zero and $1, respectively.During 2018, the Company's U.S. pension plans settled portions of their projected benefit obligations through the purchase of annuities and lump sumpayments to certain participants. In conjunction with the settlement, the Company also remeasured the pension obligations and plan assets of the affected plans,resulting in a $26 increase in accumulated other comprehensive income (loss) before tax and a corresponding decrease in net pension liabilities recorded in theconsolidated balance sheets. During 2018, the Company recognized a $14 one-time settlement gain in other income, net, which was reclassified from accumulatedother comprehensive income (loss).72Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)The weighted-average assumptions used to determine pension plan obligations and net periodic benefit costs for the plans are as follows: 2019 2018 2017 U.S.Plans Non-U.S.Plans U.S.Plans Non-U.S.Plans U.S.Plans Non-U.S.PlansWeighted average assumptions used to determinebenefit obligations at December 31 Discount rate 3.0% 1.3% 4.1% 2.0% 3.4% 1.8%Rate of compensation increase —% 2.6% —% 2.6% —% 2.6%Weighted average assumptions used to determinenet periodic benefit costs for years endedDecember 31 Discount rate for benefit obligations 4.1% 2.0% 3.4% 1.8% 3.8% 1.8%Discount rate for service cost 4.2% 2.2% 3.8% 2.0% 4.1% 1.9%Discount rate for interest cost 3.7% 2.2% 3.3% 2.0% 3.2% 2.0%Expected return on plan assets 7.0% 4.0% 7.0% 3.8% 6.8% 3.8%Rate of compensation increase —% 2.6% —% 2.6% —% 2.6%The discount rates for the Company's U.S. and non-U.S. plans are determined using a benchmark pension discount curve and applying spot rates from thecurve to each year of expected benefit payments to determine the appropriate discount rate for the Company. The assumed long-term return on plan assets isestimated by considering factors such as the plan's overall investment strategy, current economic conditions and historical averages.The Company's U.S. pension plan investments are held in the Westlake Defined Benefit Plan. The Company's overall investment strategy for these pensionplan assets is to achieve a balance between moderate income generation and capital appreciation. The investment strategy includes a mix of approximately 60% ofinvestments for long-term growth, and 40% for near-term benefit payments with a diversification of asset types. These pension funds' investment policies targetasset allocations from approximately 60% equity securities and 40% fixed income securities in order to pursue a balance between moderate income generation andcapital appreciation.Equity securities primarily include investments in large-cap and small-cap companies located in the U.S. and international developed and emerging marketsstocks. Fixed income securities are comprised of investment and non-investment grade bonds, including U.S. Treasuries and U.S. and non-U.S. corporate bonds ofcompanies from diversified industries. Each pension fund investment policy allows a discretionary range in various asset classes within the asset allocation modelof up to 10%. The Company does not believe that there are significant concentrations of risk in the pension plan assets due to its strategy of asset diversification.At December 31, 2019, plan assets did not include direct ownership of the Company's common stock.Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:Level 1: Quoted market prices in active markets for identical assets or liabilities.Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.Level 3: Unobservable inputs that are not corroborated by market data.73Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)The investments in the collective trust and mutual funds are valued using a market approach based on the net asset value of units held. The fair values of theCompany's U.S. plan assets at December 31, by asset category, are as follows: 2019 U.S. Plans Non U.S. Plans Level 1 Level 2 Total Level 1 Level 2 TotalCash and common stock: Cash and cash equivalents $— $— $— $6 $— $6Common stock 15 — 15 — — —Collective investment trust andmutual funds—Equity securities: Large-cap funds (1) 49 112 161 — 1 1Small-cap funds (2) 8 14 22 — — —International funds (3) 75 45 120 — 5 5Collective investment trust and mutual funds—Fixedincome: Bond funds (4) 100 98 198 — 7 7Short-term investment funds — 10 10 — — — $247 $279 $526 $6 $13 $19 2018 U.S. Plans Non U.S. Plans Level 1 Level 2 Total Level 1 Level 2 TotalCash and common stock: Cash and cash equivalents $— $— $— $5 $— $5Common stock 13 — 13 — — —Collective investment trust and mutual funds—Equity securities: Large-cap funds (1) 44 98 142 — 1 1Small-cap funds (2) 6 13 19 — — —International funds (3) 64 38 102 — 5 5Collective investment trust and mutual funds—Fixedincome: Bond funds (4) 96 102 198 — 6 6Short-term investment funds — 12 12 — — — $223 $263 $486 $5 $12 $17______________________________(1)Substantially all of the assets of these funds are invested in large-cap U.S. companies. The remainder of the assets of these funds is invested in cashreserves.(2)Substantially all of the assets of these funds are invested in small-cap U.S. companies. The remainder of the assets of these funds is invested in cashreserves.(3)Substantially all of the assets of these funds are invested in international companies in developed markets (excluding the U.S.). The remainder of the assets ofthese funds is invested in cash reserves.(4)This category represents investment grade bonds of U.S. issuers, including U.S. Treasury notes.The Company's funding policy for its U.S. plans is consistent with the minimum funding requirements of federal law and regulations, and based onpreliminary estimates, the Company expects to make contributions of approximately $2 for the pension plans in 2020.74Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Multi-employer PlansNon-U.S. PlansThe Company participates in two multi-employer plans, Pensionskasse der Mitarbeiter der Hoechst-Gruppe VVaG and Pensionskasse der Wacker-ChemieGmbH VVaG, which provide benefits to certain of the Company's employees in Germany. These multi-employer plans are closed to new participants. The benefitobligations are covered up to a certain salary threshold by contributions made by the Company and employees to the plans.Contributions to the Company's multi-employer plans are expensed as incurred and were as follows: Year Ended December 31, 2019 2018 2017 Non-U.S.Plans Non-U.S.Plans Non-U.S.PlansContributions to multi-employer plans (1) $9 $7 $8______________________________(1)The plan information for both the Pensionskasse der Mitarbeiter der Hoechst-Gruppe VVaG and Pensionskasse der Wacker-Chemie GmbH VVaG plans ispublicly available. The plans provide fixed, monthly retirement payments on the basis of the credits earned by the participating employees. To the extent thatthe plans are underfunded, future contributions to the plans may increase and may be used to fund retirement benefits for employees related to otheremployers. The Company does not consider either of its multi-employer plans individually significant.Other Post-retirement BenefitsIn the U.S., the Company provides post-retirement healthcare and life insurance benefits for certain employees and their dependents who meet minimum ageand service requirements. The Company has the right to modify or terminate some of these benefits.The Company also has a post-retirement plan in Canada which is unfunded and provides medical and life insurance benefits for certain employees and theirdependents.The following table provides a reconciliation of the benefit obligations of the Company's unfunded post-retirement healthcare plans. 2019 2018 U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.PlansChange in benefit obligation Benefit obligation, beginning of year $67 $3 $73 $3Service cost 1 — 1 —Interest cost 2 — 2 —Actuarial loss (gain) 3 1 (1) —Benefits paid (8) — (8) —Benefit obligation, end of year $65 $4 $67 $3 Change in plan assets Fair value of plan assets, beginning of year $— $— $— $—Employer contribution 8 — 8 —Benefits paid (8) — (8) —Fair value of plan assets, end of year $— $— $— $—Funded status, end of year $(65) $(4) $(67) $(3)75Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data) 2019 2018 U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.PlansAmounts recognized in the consolidated balance sheet atDecember 31 Current liabilities $(8) $— $(8) $—Noncurrent liabilities (57) (5) (59) (3)Net amount recognized $(65) $(5) $(67) $(3) 2019 2018 U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.PlansAmounts recognized in accumulated other comprehensive income(loss) Net gain $(3) $— $(6) $—Total before tax (1) $(3) $— $(6) $—______________________________(1)After-tax totals for post-retirement healthcare benefits were $3 and $5 for 2019 and 2018, respectively, and are reflected in stockholders' equity asaccumulated other comprehensive income (loss).The following table provides the components of net periodic benefit costs, other changes in plan assets and benefit obligation recognized in othercomprehensive income. Year Ended December 31, 2019 2018 2017 U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.PlansComponents of net periodic benefit cost Service cost $1 $— $1 $— $1 $—Interest cost 2 — 2 — 2 —Net amortization — — — — — —Net periodic benefit cost $3 $— $3 $— $3 $— Other changes in plan assets and benefitobligation recognized in OCI Net loss (gain) emerging $3 $— $(1) $(1) $(1) $—Total recognized in OCI $3 $— $(1) $(1) $(1) $—Total net periodic benefit cost and OCI $6 $— $2 $(1) $2 $—The estimated prior service cost and net loss for the post-retirement healthcare benefit plans that will be amortized from accumulated other comprehensiveincome (loss) into net periodic benefit cost during 2020 are both expected to be zero.76Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)The weighted-average assumptions used to determine post-retirement healthcare plan obligations and net periodic benefit costs for the plans are as follows: 2019 2018 2017 U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.Plans U.S. Plans Non-U.S.PlansWeighted average assumptions used to determinebenefit obligations at December 31 Discount rate 2.5% 3.2% 3.7% 3.9% 3.0% 4.0%Health care cost trend rate - Initial rate 6.8% 5.7% 7.0% 5.8% 7.3% 6.2%- Ultimate rate 4.5% 4.0% 4.5% 4.0% 4.5% 4.5%- Years to ultimate 10 21 11 22 11 12Weighted average assumptions used to determinenet periodic benefit costs for years endedDecember 31 Discount rate for benefit obligations 3.7% 3.9% 3.0% 3.6% 3.3% 3.3%Discount rate for service cost 4.0% 3.9% 3.4% 3.6% 3.8% 3.3%Discount rate for interest cost 3.4% 3.9% 2.7% 3.6% 2.6% 3.3%Health care cost trend rate - Initial rate 7.0% 5.8% 7.0% 6.1% 6.8% 6.8%- Ultimate rate 4.5% 4.0% 4.5% 4.5% 4.6% 4.5%- Years to ultimate 10 21 10 11 11 12The discount rate is determined using a benchmark pension discount curve and applying spot rates from the curve to each year of expected benefit paymentsto determine the appropriate discount rate for the Company. A one percentage-point increase or decrease in assumed healthcare trend rates would not have asignificant effect on the amounts reported for the healthcare plans.Estimated Future Benefit PaymentsThe following benefit payments are expected to be paid: PensionBenefits Other Post-retirementBenefitsEstimated future benefit payments: Year 1 $45 $8Year 2 45 8Year 3 45 8Year 4 47 8Year 5 46 7Years 6 to 10 233 2277Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)15. Stock-Based CompensationUnder the Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated in 2017, the "2013 Plan"), all employees and non-employee directors of the Company, as well as certain individuals who have agreed to become the Company's employees, are eligible for awards. Shares ofcommon stock may be issued as authorized in the 2013 Plan. At the discretion of the administrator of the 2013 Plan, employees and non-employee directors maybe granted awards in the form of stock options, stock appreciation rights, stock awards, restricted stock units or cash awards (any of which may be a performanceaward). Outstanding stock option awards have a 10-year term and vest (1) ratably on an annual basis over a three-year period or (2) at the end of a five-year period.Outstanding restricted stock units and performance stock units vest either (1) ratably on an annual basis over a two to five-year period or (2) at the end of a three orsix-year period. In accordance with accounting guidance related to share-based payments, stock-based compensation expense for all stock-based compensationawards is based on estimated grant-date fair value. The Company recognizes these stock-based compensation costs net of a forfeiture rate and on a straight-linebasis over the requisite service period of the award for only those shares expected to vest. For the years ended December 31, 2019, 2018 and 2017, the totalrecognized stock-based compensation expense related to equity awards issued under the 2013 Plan was $24, $18 and $14, respectively.Option activity and changes during the year ended December 31, 2019 were as follows: Options WeightedAverageExercisePrice WeightedAverageRemainingTerm(Years) AggregateIntrinsicValueOutstanding at December 31, 2018 1,115,954 $54.82 Granted 296,598 79.83 Exercised (18,635) 35.04 Cancelled (7,969) 79.94 Outstanding at December 31, 2019 1,385,948 $60.29 5.9 $23Exercisable at December 31, 2019 888,093 $47.64 4.5 $22For options outstanding at December 31, 2019, the options had the following range of exercise prices:Range of Prices Options Outstanding WeightedAverageRemaining ContractualLife (Years)$10.26 - $30.05 264,334 1.0$40.38 - $44.42 218,047 6.1$45.70 - $61.87 295,620 6.5$63.98 - $68.18 145,171 4.7$79.83 - $107.75 462,776 8.8The aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between the Company's closing stock price on thelast trading day of the year and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had alloption holders exercised their options on December 31, 2019. This amount changes based on the fair market value of the Company's common stock. For the yearsended December 31, 2019, 2018 and 2017, the total intrinsic value of options exercised was $1, $21 and $24, respectively.As of December 31, 2019, $6 of total unrecognized compensation cost related to stock options is expected to be recognized over a weighted-average periodof 1.8 years. Income tax benefits of $0, $4 and $8 were realized from the exercise of stock options during the years ended December 31, 2019, 2018 and 2017,respectively.78Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)The Company used the Black-Scholes option pricing model to value its options. The table below presents the weighted average value and assumptions usedin determining each option's fair value. Volatility was calculated using historical trends of the Company's common stock price. Stock Option Grants Year Ended December 31, 2019 2018 2017Weighted average fair value $21.02 $28.94 $15.84Risk-free interest rate 2.5% 2.7% 2.1%Expected life in years 5 5 5Expected volatility 28.9% 27.6% 29.2%Expected dividend yield 1.2% 0.7% 1.2%Non-vested restricted stock units as of December 31, 2019 and changes during the year ended December 31, 2019 were as follows: Number ofUnits WeightedAverageGrant DateFair ValueNon-vested at December 31, 2018 702,789 $65.79Granted 205,517 77.59Vested (415,593) 56.70Forfeited (29,430) 73.28Non-vested at December 31, 2019 463,283 $78.69As of December 31, 2019, there was $15 of unrecognized stock-based compensation expense related to non-vested restricted stock units. This cost isexpected to be recognized over a weighted-average period of 1.7 years. The total fair value of restricted stock units that vested during the years endedDecember 31, 2019, 2018 and 2017 was $28, $10 and $6, respectively.Performance stock unit payout is based on the greater of the average annual economic-value added results for the Company (equal to net operating profitafter tax less a capital charge based upon the weighted average cost of capital) and relative total shareholder return as compared to a peer group of companies. Theunits have payouts that range from zero to 200 percent of the target award.Non-vested performance stock units as of December 31, 2019 and changes during the year ended December 31, 2019 were as follows: Number ofUnits WeightedAverageGrant DateFair ValueNon-vested at December 31, 2018 — $—Granted 78,328 114.38Vested — —Forfeited (1,111) 114.38Non-vested at December 31, 2019 77,217 $114.38As of December 31, 2019, there was $6 of unrecognized stock-based compensation expense related to non-vested performance stock units. This cost isexpected to be recognized over a weighted-average period of 2.1 years. There were no such awards issued during the years ended December 31, 2018 and 2017.The Company used a Monte Carlo simulation model to value the performance stock units on the grant date. The table below presents the assumptions used indetermining grant date fair value. Volatility was calculated using historical trends of the Company's common stock price.79Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data) Year EndedDecember 31, 2019Performance StockUnitsRisk-free interest rate 2.5%Expected life in years 2.88Expected volatility of Westlake Chemical Corporation common stock 30.3%Expected volatility of peer companies 14.5% - 47.8%Average correlation coefficient of peer companies 0.49Grant date fair value $114.38Liability Classified AwardsCertain of the Company's restricted stock unit awards are classified as liability awards for accounting purposes and are re-measured at each reporting dateuntil they vest. Total stock-based compensation expense recognized related to these restricted stock units during the years ended December 31, 2019, 2018, and2017 was $1, $4 and $9, respectively.Non-vested liability classified restricted stock awards as of December 31, 2019 and changes during the year ended December 31, 2019 were as follows: Number ofUnits Weighted AverageFair ValueNon-vested at December 31, 2018 49,528 $66.46Vested (49,292) 68.22Cancelled (236) 76.77Non-vested at December 31, 2019 — —As of December 31, 2019, there was no unrecognized stock-based compensation expense related to non-vested liability classified restricted stock awards.The total fair value of liability classified restricted stock awards that vested during the years ended December 31, 2019, 2018 and 2017 was $3, $6 and $11,respectively. The total fair value of liability classified restricted stock awards cancelled during the year ended December 31, 2019 was $0.Westlake Chemical Partners LP AwardsThe Company's wholly-owned subsidiary and the general partner of Westlake Partners, Westlake Chemical Partners GP LLC ("Westlake Partners GP"),maintains a unit-based compensation plan for directors and employees of WLKP GP and Westlake Partners.The Westlake Partners 2014 Long-term Incentive Plan ("Westlake Partners 2014 Plan") permits various types of equity awards including but not limited togrants of phantom units and restricted units. Awards granted under the Westlake Partners 2014 Plan may be settled with Westlake Partners units or in cash or acombination thereof. Compensation expense for these awards was not material to the Company's consolidated financial statements for the years endedDecember 31, 2019, 2018 and 2017.16. Fair Value MeasurementsThe Company has financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents,accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The amounts reported in the consolidated balance sheetsfor cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. Thecarrying and fair values of the Company's long-term debt at December 31, 2019 and 2018 are summarized in the table below. The Company's long-term debtinstruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not beactively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy. 2019 2018 CarryingValue FairValue CarryingValue FairValue3.60% 2022 Senior Notes $249 $255 $249 $2483.60% 2026 Senior Notes 742 777 741 692Loan related to tax-exempt waste disposal revenue bonds due 2027 11 11 11 116 ½% 2029 GO Zone Senior Notes 99 103 99 1066 ½% 2035 GO Zone Senior Notes 88 92 88 956 ½% 2035 IKE Zone Senior Notes 65 68 65 695.0% 2046 Senior Notes 677 761 676 6414.375% 2047 Senior Notes 491 505 491 4173.50% 2032 GO Zone Refunding Senior Notes 249 267 248 2331.625% 2029 Senior Notes 774 785 — —17. Income TaxesThe components of income before income taxes are as follows: Year Ended December 31, 2019 2018 2017Domestic $460 $1,087 $917Foreign 110 247 164 $570 $1,334 $1,081The Company's provision for (benefit from) income taxes consists of the following: Year Ended December 31, 2019 2018 2017Current Federal $20 $158 $231State 9 28 18Foreign 25 52 27Total current 54 238 276Deferred Federal 69 59 (557)State 11 (2) 25Foreign (26) 5 (2)Total deferred 54 62 (534)Total provision for (benefit from) income taxes $108 $300 $(258)80Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)A reconciliation of taxes computed at the statutory rate to the Company's income tax expense is as follows: Year Ended December 31, 2019 2018 2017Provision for federal income tax, at statutory rate $120 $280 $378State income tax provision, net of federal income tax effect 10 28 26Foreign income tax rate differential (6) 14 (36)Manufacturing deduction — — (23)Depletion (5) (4) (7)Noncontrolling interests (8) (6) (9)Tax Act related adjustment — — (591)Change in valuation allowance (17) (9) 3Changes in state apportionment and other state adjustments 11 (6) 2Other, net 3 3 (1)Total income tax expense (benefit) $108 $300 $(258)The tax effects of the principal temporary differences between financial reporting and income tax reporting at December 31 are as follows: 2019 2018Net operating loss carryforward $209 $50Credit carryforward 25 24Operating lease liabilities 96 —Accruals 65 64Pension 83 76Inventories 20 13Other 26 17Deferred taxes assets—total 524 244Property, plant and equipment (1,017) (948)Intangibles (156) (148)Operating lease right-of-use asset (95) —Turnaround costs (21) (20)Consolidated partnerships (194) (202)Equity method investments (220) (13)Other (18) (14)Deferred tax liabilities—total (1,721) (1,345)Valuation allowance (30) (47)Total net deferred tax liabilities $(1,227) $(1,148) Balance sheet classifications Noncurrent deferred tax asset $28 $11Noncurrent deferred tax liability (1,255) (1,159)Total net deferred tax liabilities $(1,227) $(1,148)81Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)At December 31, 2019, the Company had federal, foreign and state net operating loss carryforwards ("NOLs") of approximately $539, $217 and $613,respectively. The increase in the federal and state NOLs is primarily due to bonus tax depreciation from the Company's investment in LACC accounted for as anequity method investment. The federal NOL and certain foreign and state NOLs do not expire, while certain other foreign and state NOLs expire in varyingamounts between 2020 and 2039. Certain NOLs are subject to limitations on an annual basis. At December 31, 2019, the Company had various federal, foreignand state credits carryforwards of $2, $4 and $19, respectively, which either do not expire or expire in varying amounts between 2020 and 2033. Managementbelieves the Company will realize the benefit of a portion of the net operating loss carryforwards before they expire, but to the extent that the full benefit may notbe realized, a valuation allowance has been recorded. The valuation allowance decreased by $17 in 2019, primarily due to a $19 release in valuation allowanceresulting from a change in management judgment regarding the realizability of certain foreign deferred tax assets, including net operating loss and creditcarryforwards, as a result of the change in expectations of income in future years.As result of the Tax Act, the Company recognized an income tax benefit of $591 in the 2017 consolidated financial statements for items such as a revaluationof deferred tax assets and liabilities, partially offset by a one-time U.S. tax on the mandatory deemed repatriation of the Company's post-1986 foreign earnings.The Company did not record any material measurement period adjustment in 2018. The accounting for the income tax effects of the Tax Act was completed in2018.The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject toexaminations by tax authorities before the year 2012.18. Earnings and Dividends per ShareThe Company has unvested restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earningsper share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stockoutstanding during the periods. Diluted earnings per share include the effect of certain stock options and performance stock units. Year Ended December 31, 2019 2018 2017Net income attributable to Westlake Chemical Corporation $421 $996 $1,304Less: Net income attributable to participating securities (2) (5) (7)Net income attributable to common shareholders $419 $991 $1,297The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations: Year Ended December 31, 2019 2018 2017Weighted average common shares—basic 128,395,184 129,401,823 129,087,043Plus incremental shares from: Assumed exercise of options and vesting of performance stock units 362,109 583,930 452,970Weighted average common shares—diluted 128,757,293 129,985,753 129,540,013 Earnings per common share attributable to Westlake Chemical Corporation: Basic $3.26 $7.66 $10.05Diluted $3.25 $7.62 $10.0082Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Excluded from the computation of diluted earnings per share for the years ended December 31, 2019 and 2018 are options to purchase 562,773 and 150,479shares of common stock, respectively. There are no antidilutive options to purchase shares of common stock for the year ended December 31, 2017. These optionswere outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive.Dividends per ShareDividends per common share for the years ended December 31, 2019, 2018 and 2017 were as follows: Year Ended December 31, 2019 2018 2017Dividends per common share $1.0250 $0.9200 $0.801219. Supplemental InformationAccrued LiabilitiesAccrued liabilities were $768 and $676 at December 31, 2019 and 2018, respectively. Accrued rebates, which is a component of accrued liabilities, was$115 and $125 at December 31, 2019 and 2018, respectively. Other than the lease liability disclosed in Note 7, no other component of accrued and other liabilitieswas more than five percent of total current liabilities. Accrued liabilities with related parties were $41 and $54 at December 31, 2019 and 2018, respectively.Non-cash Investing ActivityThe change in capital expenditure accruals increasing additions to property, plant and equipment was $14 for the year ended December 31, 2019. The changein capital expenditure accruals reducing additions to property, plant and equipment was $48 and $9 for the years ended December 31, 2018 and 2017, respectively.Restructuring, Transaction and Integration-related CostsFor the year ended December 31, 2019, the restructuring, transaction and integration-related costs of $37 primarily consisted of restructuring expenses of $26and acquisition costs. The restructuring expenses represent charges associated with the write-off of certain assets in the Vinyls segment. For the year endedDecember 31, 2018, the restructuring, transaction and integration-related costs of $33 primarily consisted of integration-related consulting fees and acquisitioncosts.Other Income, NetFor the year ended December 31, 2019, other income, net included income from unconsolidated subsidiaries and interest income of $17 and $20,respectively. For the year ended December 31, 2018, other income, net included income from pension and post-retirement plans, including a one-time settlementgain, income from unconsolidated subsidiaries and interest income of $25, $16 and $17, respectively. For the year ended December 31, 2017, other income, netincluded income from unconsolidated subsidiaries of $10. No other components of other income, net were material to the statements of operations for the yearsended December 31, 2019, 2018 and 2017.Operating Lease Supplemental Cash FlowSupplemental cash flow information related to leases was as follows: Year Ended December31, 2019Operating cash flows from operating leases (1) $112Right-of-use assets obtained in exchange for operating lease obligations 119_____________(1)Includes cash paid for amounts included in the measurement of operating lease liabilities recorded in the consolidated balancesheets.83Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Cash Flow Information Year Ended December 31, 2019 2018 2017Cash paid for: Interest paid, net of interest capitalized $116 $140 $154Income taxes paid 77 376 8420. Related Party and Affiliate TransactionsThe Company and Lotte have a joint venture, LACC, to design, build and operate an ethylene facility with 2.2 billion pounds per year of ethylene productioncapacity. See Note 9 for details of the Company's transactions with LACC.The Company leases office space for management and administrative services from an affiliate of the Company's principal stockholder. For each of the yearsended December 31, 2019, 2018 and 2017, the Company incurred lease payments of approximately $3.Cypress Interstate Pipeline L.L.C., a natural gas liquids pipeline joint venture company in which the Company owns a 50% equity stake, transports naturalgas liquid feedstocks to the Company's Lake Charles complex through its pipeline. The Company accounts for its investments in Cypress Interstate Pipeline L.L.C.under the equity method of accounting. The investment in Cypress Interstate Pipeline L.L.C. at December 31, 2019 and 2018 was $8 and $8, respectively. For theyears ended December 31, 2019, 2018 and 2017, the Company incurred pipeline lease service fees of approximately $14, $14 and $15, respectively, payable to thisjoint venture for usage of the pipeline. The amounts due to this joint venture were $1 and $2 at December 31, 2019 and 2018, respectively.The Company owns an approximately 20% interest in both YNCORIS GmbH & Co. KG (formerly known as InfraServ Knapsack GmbH & Co. KG) andInfraServ Gendorf GmbH & Co. KG (collectively "Infraserv"). The Company accounts for its investments in Infraserv under the equity method of accounting. TheCompany has service agreements with these entities, including contracts to provide electricity, technical and leasing services to certain of the Company'sproduction facilities in Germany. The investment in Infraserv was $57 and $57 at December 31, 2019 and 2018, respectively. For the years ended December 31,2019, 2018 and 2017, the Company incurred charges aggregating approximately $155, $145 and $133, respectively, for these services. The amounts accrued forthese related parties were approximately $36 and $48 at December 31, 2019 and 2018, respectively.The Company owns a 50% interest in RS Cogen LLC ("RS Cogen"). RS Cogen operates a process steam, natural gas-fired cogeneration facility adjacent tothe Lake Charles South Facility. The Company accounts for its investment in RS Cogen under the equity method of accounting. The investment in RS Cogen atDecember 31, 2019 and 2018 was $9 and $5, respectively. For the years ended December 31, 2019, 2018 and 2017, the Company recorded purchases ofapproximately $26, $25 and $26 from RS Cogen, respectively.The Company owns a 50% interest in Vinyl Solutions, LLC ("Vinyl Solutions"). The Company accounts for its investments in Vinyl Solutions under theequity method of accounting. Vinyl Solutions is a compounding manufacturer of specialty compounds. For the years ended December 31, 2019, 2018 and 2017, theCompany recorded sales of $5, $13 and $17, respectively, to Vinyl Solutions. The amounts receivable from this related party were $2 and $3 at December 31,2019 and 2018, respectively.Dividends received from equity method investments were $11, $5 and $6 for the years ended December 31, 2019, 2018 and 2017, respectively.One of the Company's directors serves as Chairman, Chief Executive Officer and President of American Air Liquide Holdings, Inc. and Executive VicePresident of the Air Liquide Group ("Air Liquide"). The Company purchased oxygen, nitrogen and utilities and leased cylinders from various affiliates ofAmerican Air Liquide Holdings, Inc. including Airgas and subsidiaries that were acquired in 2016 by Air Liquide aggregating approximately $32, $31 and $30 forthe years ended December 31, 2019, 2018 and 2017, respectively. The Company also sold certain utilities to Air Liquide aggregating approximately $7, $7 and $7during the years ended December 31, 2019, 2018 and 2017, respectively. The amounts payable to Air Liquide were $2 and $4 at December 31, 2019 and 2018,respectively, and the amounts receivable from Air Liquide were $0 and $1 at December 31, 2019 and 2018, respectively.84Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)21. Westlake Chemical Partners LPIn 2014, the Company formed Westlake Partners to operate, acquire and develop ethylene production facilities and related assets. Also in 2014, WestlakePartners completed its initial public offering of 12,937,500 common units.On March 29, 2019, Westlake Partners purchased an additional 4.5% newly issued limited partner interests in OpCo for approximately $201 and completed aprivate placement of 2,940,818 common units at a price of $21.40 per common unit for total proceeds of approximately $63. TTWF LP, the Company's principalstockholder and a related party, acquired 1,401,869 units out of the 2,940,818 common units issued in the private placement. At December 31, 2019, WestlakePartners had a 22.8% limited partner interest in OpCo, and the Company retained a 77.2% limited partner interest in OpCo and a significant interest in WestlakePartners through the Company's ownership of Westlake Partners' general partner, 40.1% of the limited partner interests (consisting of 14,122,230 common units)and incentive distribution rights.On October 4, 2018, Westlake Partners and Westlake Partners GP, the general partner of Westlake Partners, entered into an Equity Distribution Agreementwith UBS Securities LLC, Barclays Capital Inc., Citigroup Global Markets Inc., Deutsche Bank Securities Inc., RBC Capital Markets, LLC, Merrill Lynch, Pierce,Fenner & Smith Incorporated and Wells Fargo Securities, LLC to offer and sell Westlake Partners' common units, from time to time, up to an aggregate offeringamount of $50. No common units were issued under this program in 2019 and 2018.22. Commitments and ContingenciesThe Company is involved in a number of legal and regulatory matters, principally environmental in nature, that are incidental to the normal conduct of itsbusiness, including lawsuits, investigations and claims. The outcome of these matters are inherently unpredictable. The Company believes that, in the aggregate, theoutcome of all known legal and regulatory matters will not have a material adverse effect on its consolidated financial statements; however, under certaincircumstances, if required to recognize costs in a specific period, when combined with other factors, outcomes with respect to such matters may be material to theCompany's consolidated statements of operations in such period. The Company's assessment of the potential impact of environmental matters, in particular, issubject to uncertainty due to the complex, ongoing and evolving process of investigation and remediation of such environmental matters, and the potential fortechnological and regulatory developments. In addition, the impact of evolving claims and programs, such as natural resource damage claims, industrial site reuseinitiatives and state remediation programs creates further uncertainty of the ultimate resolution of these matters. The Company anticipates that the resolution ofmany legal and regulatory matters, and in particular environmental matters, will occur over an extended period of time.The Company and other caustic soda producers were named as defendants in multiple purported class action civil lawsuits filed since March 2019 in the U.S.District Court for the Western District of New York. The lawsuits allege the defendants conspired to fix, raise, maintain and stabilize the price of caustic soda,restrict domestic (U.S.) supply of caustic soda and allocate caustic soda customers. The other defendants named in the lawsuits are Olin Corporation, K.A. SteelChemicals (a wholly-owned subsidiary of Olin), Occidental Petroleum Corporation, Occidental Chemical Corporation d/b/a OxyChem, Shin-Etsu Chemical Co.,Ltd., Shintech Incorporated, Formosa Plastics Corporation, and Formosa Plastics Corporation, U.S.A. Each of the lawsuits is filed on behalf of the respectivenamed plaintiff or plaintiffs and a putative class comprised of either direct purchasers or indirect purchasers of caustic soda in the U.S. Plaintiffs seek anunspecified amount of damages and injunctive relief. The Company has already moved to dismiss the majority of the lawsuits filed and plans to file similarmotions with respect to the remaining lawsuits. At this time, the Company is not able to estimate the impact, if any, that these lawsuits could have on theCompany's consolidated financial statements either in the current period or in future periods.Environmental. As of December 31, 2019 and 2018, the Company had reserves for environmental contingencies totaling approximately $47 and $54,respectively, most of which was classified as noncurrent liabilities. The Company's assessment of the potential impact of these environmental contingencies issubject to considerable uncertainty due to the complex, ongoing and evolving process of investigation and remediation, if necessary, of such environmentalcontingencies, and the potential for technological and regulatory developments.85Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)Calvert City Proceedings. For several years, the Environmental Protection Agency (the "EPA") has been conducting remedial investigation and feasibilitystudies at the Company's Calvert City, Kentucky facility pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act of 1980("CERCLA"). As the current owner of the Calvert City facility, the Company was named by the EPA as a potentially responsible party ("PRP") along withGoodrich Corporation ("Goodrich") and its successor-in-interest, PolyOne Corporation ("PolyOne"). On November 30, 2017, the EPA published a draft ProposedPlan, incorporating by reference an August 2015 draft Remedial Investigation ("RI") report, an October 2017 draft Feasibility Study ("FS") report and a newTechnical Impracticability Waiver document dated December 19, 2017. On June 18, 2018, the EPA published an amendment to its Proposed Plan. The amendedProposed Plan describes a final remedy for the onshore portion of the site comprised of a containment wall, targeted treatment and supplemental hydrauliccontainment. The amended Proposed Plan also describes an interim approach to address the contamination under the river that would include recovery of anymobile contaminants by an extraction well along with further study of the extent of the contamination and potential treatment options. The EPA's estimated cost ofimplementation is $107, with an estimated $1 to $3 in annual operation and maintenance ("O&M") costs. In September 2018, the EPA published the Record ofDecision ("ROD") for the site, formally selecting the preferred final and interim remedies outlined in the amended Proposed Plan. In October 2018, EPA issuedSpecial Notice letters to the PRPs for the remedial design phase of work under the ROD. In April 2019, the PRPs and the EPA entered into an administrativesettlement agreement and order on consent for remedial design. In October 2019, the PRPs received special notice letters for the remedial action phase of work atthe site. The Company, jointly with the other PRPs, submitted a good faith offer response in December 2019. The Company's allocation of liability for remedialand O&M costs at the Calvert City site, if any, is governed by a series of agreements between the Company, Goodrich and PolyOne. These agreements are thesubject of further litigation as described below.In connection with the 1990 and 1997 acquisitions of the Goodrich chemical manufacturing complex in Calvert City, Goodrich agreed to indemnify theCompany for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closingcontamination caused by the Company's operations. The soil and groundwater at the complex, which does not include the Company's nearby PVC facility, hadbeen extensively contaminated by Goodrich's operations. In 1993, Goodrich spun off the predecessor of PolyOne, and that predecessor assumed Goodrich'sindemnification obligations relating to preexisting contamination. In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to theallocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement,the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties,incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; and (2) either the Company or PolyOne might, from time totime in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage. In May 2017, PolyOne filed a demand forarbitration. In this proceeding, PolyOne sought to readjust the percentage allocation of future costs and to recover approximately $11 from the Company inreimbursement of previously paid remediation costs. The Company's cross demand for arbitration seeking unreimbursed remediation costs incurred during therelevant period was dismissed from the proceedings when PolyOne paid such costs in full at the beginning of the arbitration hearing.On July 10, 2018, PolyOne sued the Company in the U.S. District Court for the Western District of Kentucky and sought to invalidate the arbitrationprovisions in the parties' 2007 settlement agreement and enjoin the arbitration it had initiated in 2017. On July 30, 2018, the district court refused to enjoin thearbitration and, on January 15, 2019, the court granted the Company's motion to dismiss PolyOne's suit. On February 13, 2019, PolyOne appealed those decisionsto the U.S. Court of Appeals for the Sixth Circuit. The court of appeals issued an opinion and final order on September 6, 2019, affirming the district court.The arbitration hearing began in August 2018 and concluded in December 2018. On May 22, 2019, the arbitration panel issued its final award. It determinedthat PolyOne was responsible for 100% of the allocable costs at issue in the proceeding and that PolyOne would remain responsible for 100% of the costs tooperate the existing groundwater remedy at the Calvert City site. In August 2019, PolyOne filed a motion to vacate before the U.S. District Court for the WesternDistrict of Kentucky, seeking to invalidate the final award under the Federal Arbitration Act. On February 11, 2020, the U.S. District Court for the Western Districtof Kentucky denied PolyOne's motion to vacate and affirmed the arbitration final award. PolyOne has until March 10, 2020 to appeal that order.86Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)At this time, the Company is not able to estimate the impact, if any, that the issuance of the final award in the arbitration proceeding, or any subsequentjudicial proceeding, could have on the Company's consolidated financial statements either in the current period or in later periods. Any cash expenditures that theCompany might incur in the future with respect to the remediation of contamination at the Calvert City complex would likely be spread out over an extendedperiod. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individualreporting period.Environmental Remediation: Reasonably Possible Matters. The Company's assessment of the potential impact of environmental contingencies is subject toconsiderable uncertainty due to the complex, ongoing and evolving process of investigation and remediation, if necessary, of such environmental contingencies,and the potential for technological and regulatory developments. As such, in addition to the amounts currently reserved, the Company may be subject toreasonably possible loss contingencies related to environmental matters in the range of $70 to $130.Other CommitmentsThe Company has various unconditional purchase obligations, primarily to purchase goods and services, including commitments to purchase various utilities,feedstock, nitrogen, oxygen, product storage and pipeline usage. Unrecorded unconditional purchase obligations for the next five years are as follows: $584, $621,$497, $461 and $360 in 2020, 2021, 2022, 2023 and 2024, respectively.23. Segment and Geographic InformationSegment InformationThe Company operates in two principal operating segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of differentproducts. The Company manages each segment separately as each business requires different technology and marketing strategies.The Company's Olefins segment manufactures and markets polyethylene, styrene monomer and various ethylene co-products. The Company's ethyleneproduction is used in the Company's polyethylene, styrene and VCM operations. In addition, the Company sells ethylene and ethylene co-products, primarilypropylene, crude butadiene, pyrolysis gasoline and hydrogen, to external customers.No single customer accounted for more than 10% of sales in the Olefins segment for the years ended December 31, 2019, 2018 or 2017.The Company's Vinyl segment manufactures and markets PVC, VCM, ethylene dichloride ("EDC"), chlor-alkali (chlorine and caustic soda), chlorinatedderivative products and ethylene. The Company also manufactures and sells building products fabricated primarily from PVC, including residential siding, trimand mouldings, pipe and fittings for various water, sewer and industrial applications, profiles for windows and doors, decking products, film for various inflatables,wall covering tapes, roofing applications and composite roof tiles. The Company's primary North American chemical manufacturing facilities are located in itsCalvert City, Kentucky and Lake Charles, Plaquemine and Geismar, Louisiana sites. The Company also produces chlorine, caustic soda, hydrogen and chlorinatedderivative products at its facilities in Natrium, Longview, Washington and Beauharnois, Quebec and PVC resin and PVC compounds at several facilities inMississippi. In addition to North America, the Company also has manufacturing facilities in Europe and Asia.As of December 31, 2019, the Company owned 36 building products and PVC compound facilities. The Company primarily uses its chlorine, VCM andPVC production to manufacture its building products. No single customer accounted for more than 10% of sales in the Vinyls segment for the years endedDecember 31, 2019, 2018 or 2017.The accounting policies of the individual segments are the same as those described in Note 1. Year Ended December 31, 2019 2018 2017Net external sales Olefins Polyethylene $1,301 $1,519 $1,518Styrene, feedstock and other 481 500 533Total olefins 1,782 2,019 2,051Vinyls PVC, caustic soda and other 5,068 5,359 4,769Building products 1,268 1,257 1,221Total vinyls 6,336 6,616 5,990 $8,118 $8,635 $8,041 Intersegment sales Olefins $324 $500 $393Vinyls 1 2 1 $325 $502 $394 Income (loss) from operations Olefins $260 $573 $655Vinyls 451 913 639Corporate and other (55) (78) (69) $656 $1,408 $1,225 Depreciation and amortization Olefins $142 $138 $145Vinyls 563 491 449Corporate and other 8 12 7 $713 $641 $601 Other income, net Olefins $5 $4 $3Vinyls 18 35 7Corporate and other 15 13 5 $38 $52 $15 Provision for (benefit from) income taxes Olefins $60 $128 $63Vinyls 40 212 (302)Corporate and other 8 (40) (19) $108 $300 $(258) Capital expenditures Olefins $117 $110 $97Vinyls 664 585 459Corporate and other 6 7 21 $787 $702 $57787Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)A reconciliation of total segment income from operations to consolidated income before income taxes is as follows: Year Ended December 31, 2019 2018 2017Income from operations for reportable segments $656 $1,408 $1,225Interest expense (124) (126) (159)Other income, net 38 52 15Income before income taxes $570 $1,334 $1,081 December 31, 2019 December 31, 2018Total assets Olefins $1,991 $2,024Vinyls 10,597 8,879Corporate and other 673 699 $13,261 $11,602Geographic Information Year Ended December 31, 2019 2018 2017Net sales to external customers (1) United States $5,530 $6,114 $5,739Foreign Canada 573 649 653Germany 478 500 432China 175 155 104Italy 119 105 96Taiwan 84 102 96Other 1,159 1,010 921 $8,118 $8,635 $8,041 December 31, 2019 December 31, 2018Long-lived assets United States $6,012 $5,829Foreign Germany 588 528Other 312 238 $6,912 $6,595______________________________(1)Net sales are attributed to countries based on location of customer.88Table of Contents WESTLAKE CHEMICAL CORPORATIONNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)(in millions of dollars, except share amounts and per share data)24. Quarterly Financial Information (Unaudited) Three Months Ended March 31, 2019 June 30, 2019 September 30, 2019 December 31, 2019Net sales $2,025 $2,144 $2,066 $1,883Gross profit 299 340 371 250Income from operations 134 194 226 102Net income 82 129 166 85Net income attributable to Westlake Chemical Corporation 72 119 158 72Earnings per common share attributable to Westlake ChemicalCorporation: Basic $0.56 $0.92 $1.22 $0.56Diluted $0.55 $0.92 $1.22 $0.56 Three Months Ended March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018Net sales $2,150 $2,235 $2,255 $1,995Gross profit 542 552 539 354Income from operations 401 404 396 207Net income 297 288 318 131Net income attributable to Westlake Chemical Corporation 287 278 308 123Earnings per common share attributable to Westlake ChemicalCorporation: (1) Basic $2.21 $2.13 $2.36 $0.95Diluted $2.20 $2.12 $2.35 $0.95______________________________(1)Basic and diluted earnings per common share ("EPS") for each quarter is computed using the weighted average shares outstanding during that quarter, whileEPS for the year is computed using the weighted average shares outstanding for the year. As a result, the sum of the EPS for each of the four quarters maynot equal the EPS for the year.89Table of Contents Item 9. Changes in and Disagreements with Accountants on Accounting and Financial DisclosureNone.Item 9A. Controls and ProceduresDisclosure, Controls and ProceduresWe carried out an evaluation, under the supervision and with the participation of our management, including our President and Chief Executive Officer (ourprincipal executive officer) and our Executive Vice President and Chief Financial Officer (our principal financial officer), of the effectiveness of our disclosurecontrols and procedures pursuant to Rules 13a-15 and 15d-15 under the Securities Exchange Act of 1934 as of the end of the period covered by this Form 10-K.Based upon that evaluation, our President and Chief Executive Officer and our Executive Vice President and Chief Financial Officer concluded that our disclosurecontrols and procedures are effective as of December 31, 2019 to provide reasonable assurance that information required to be disclosed by us in the reports thatwe file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and isaccumulated and communicated to management as appropriate to allow timely decisions regarding required disclosure.Internal Control Over Financial ReportingWestlake's management's report on internal control over financial reporting appears on page 47 of this Annual Report on Form 10-K. In addition,PricewaterhouseCoopers LLP, the independent registered public accounting firm that audited the financial statements included in this Annual Report on Form 10-K, has also audited the effectiveness of internal control over financial reporting as of December 31, 2019, as stated in their report that appears on page 48 of thisAnnual Report on Form 10-K.Changes in Internal Control Over Financial ReportingThere were no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2019 that have materiallyaffected, or are reasonably likely to materially affect, our internal control over financial reporting.Item 9B. Other InformationOn February 14, 2020, the Compensation Committee (the "Committee") of the Board of Directors of the Company approved the one-time grant of certainrestricted stock units ("RSUs") to the Company's chief executive officer, chief financial officer and each of the other executive officers listed in the SummaryCompensation Table in the Company's proxy statement for its 2019 Annual Meeting of Stockholders (collectively, the "Named Executive Officers"). These awardswere granted in lieu of an increase in the Named Executive Officers' base salary for 2020 and were in addition to the Company's annual awards of stock options,restricted stock units and performance stock units to the Named Executive Officers, which were also approved by the Committee on February 14, 2020.The RSUs will vest on February 14, 2021. The Committee also granted additional RSUs that will vest on February 14, 2025 to Mr. Kearns as a one-timeretention award. The number of these special RSUs and the grant date fair values are set forth below with respect to each of the Named Executive Officers:Named Executive Officer Number of RSUs Grant Date Fair ValueMr. Albert Chao 3,966 (1) $261,012Mr. James Chao 3,072 (1) 202,176Mr. Steven Bender 1,478(1) 97,271Mr. Robert Buesinger 1,128(1) 74,237Mr. Roger Kearns 9,877(2)2,150(1) 650,030141,479______________________________(1)These RSUs vest on February 14,2021.(2)These RSUs vest on February 14,2025.90Table of ContentsPART IIIItem 10. Directors, Executive Officers and Corporate Governance.Pursuant to Item 401(b) of Regulation S-K, the information required by this item with respect to our executive officers is set forth in Part I of this Form 10-K.Item 11. Executive Compensation.Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.Item 13. Certain Relationships and Related Transactions, and Director Independence.Item 14. Principal Accountant Fees and Services.The information required by Items 10, 11, 12, 13 and 14 is incorporated by reference to the Proxy Statement, which will be filed with the SEC pursuant toRegulation 14A under the Exchange Act within 120 days of December 31, 2019.91Table of ContentsPART IVItem 15. Exhibits and Financial Statement Schedules(a)(1)The financial statements listed in the Index to Consolidated Financial Statements in Item 8 of this Form 10-K are filed as part of this Form 10-K. (a)(2)All schedules are omitted because the information is not applicable, not required, or has been furnished in the Consolidated Financial Statements orNotes thereto in Item 8 of this Form 10-K. (a)(3)ExhibitsExhibit No. Exhibit Index 2.1Agreement and Plan of Merger, dated June 10, 2016, by and among Westlake Chemical Corporation, Lagoon Merger Sub, Inc. and AxiallCorporation (incorporated by reference to Exhibit 2.1 to Westlake's Current Report on Form 8-K, filed on June 14, 2016, File No. 001-32260). 3.1 Amended and Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of State on August 6, 2004 (incorporatedby reference to Westlake's Registration Statement on Form S-1/A, filed on August 9, 2004). 3.2 Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of Stateon May 16, 2014 (incorporated by reference to Westlake's Current Report on Form 8-K, filed on May 16, 2014, File No. 001-32260). 3.3 Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Westlake as filed with the Delaware Secretary of Stateon May 19, 2017 (incorporated by reference to Westlake's Current Report on Form 8-K, filed on May 19, 2017, File No. 001-32260). 3.4 Bylaws of Westlake (incorporated by reference to Westlake's Registration Statement on Form S-1/A, filed on August 9, 2004). 4.1† Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 4.2 Indenture dated as of January 1, 2006 by and among Westlake, the potential subsidiary guarantors listed therein and JPMorgan Chase Bank,National Association, as trustee (incorporated by reference to Westlake's Current Report on Form 8-K, filed on January 13, 2006, File No. 1-32260). 4.3 Third Supplemental Indenture, dated as of July 2, 2010, among the Company, the Subsidiary Guarantors (as defined therein) and The Bank ofNew York Mellon Trust Company, N.A., as trustee (incorporated by reference to Westlake's Current Report on Form 8-K, filed on July 8, 2010,File No. 1-32260). 4.4 Fourth Supplemental Indenture, dated as of December 2, 2010, among the Company, the Subsidiary Guarantors (as defined therein) and TheBank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Westlake's Current Report on Form 8-K, filed onDecember 8, 2010, File No. 1-32260). 4.5 Fifth Supplemental Indenture, dated as of December 2, 2010, among the Company, the Subsidiary Guarantors (as defined therein) and The Bankof New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Westlake's Current Report on Form 8-K, filed onDecember 8, 2010, File No. 1-32260). 4.6 Supplemental Indenture, dated as of December 31, 2007, among the Company, WPT LLC, Westlake Polymers LLC, Westlake PetrochemicalsLLC, Westlake Styrene LLC, the other subsidiary guarantors party thereto and The Bank of New York Trust Company, N.A. related to the6 ¾% senior notes (incorporated by reference to Exhibit 4.7 to Westlake's Annual Report on Form 10-K for the year ended December 31, 2007,filed on February 20, 2008, File No. 1-32260). 4.7 Sixth Supplemental Indenture, dated as of July 17, 2012, among the Company, the Subsidiary Guarantors (as defined therein) and The Bank ofNew York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K,filed with the Securities and Exchange Commission on July 16, 2012, File No. 1-32260). 4.8 Seventh Supplemental Indenture, dated as of February 12, 2013, among the Company, the Subsidiary Guarantors (as defined therein) and TheBank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.16 to Westlake's Annual Report on Form10-K for the year ended December 31, 2012, filed on February 22, 2013, File No. 1-32260). 92Table of ContentsExhibit No. Exhibit Index 4.9Eighth Supplemental Indenture (including the form of the Notes), dated as of August 10, 2016, among Westlake Chemical Corporation, theGuarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 toWestlake's Current Report on Form 8-K, filed on August 10, 2016, File No. 001-32260).4.10Fourth Supplemental Indenture, dated as of August 22, 2016, to the Indenture, dated as of February 1, 2013, by and among Axiall Corporation,the guarantors party thereto and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to Axiall's Current Reporton Form 8-K, filed on August 22, 2016, File No. 001-09753).4.11Fifth Supplemental Indenture, dated as of August 22, 2016, to the Indenture, dated as of January 28, 2013, by and among Eagle Spinco Inc., theguarantors party thereto and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.2 to Axiall's Current Report onForm 8-K, filed on August 22, 2016, File No. 001-09753).4.12Ninth Supplemental Indenture (including the form of the Notes) as of September 7, 2016, among Westlake Chemical Corporation, theGuarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 toWestlake's Current Report on Form 8-K, filed on September 7, 2016, File No. 001-32260).4.13 Tenth Supplemental Indenture (including the form of the Notes), dated as of November 29, 2017, among Westlake Chemical Corporation, theSubsidiary Guarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference toExhibit 4.2 to Westlake's Current Report on Form 8-K, filed on November 28, 2017, File No. 001-32260). 4.14 Eleventh Supplemental Indenture (including the form of the Notes), dated as of November 28, 2017, among Westlake Chemical Corporation,the Subsidiary Guarantors (as defined therein) and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by referenceto Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on November 28, 2017, File No. 001-32260). 4.15 Twelfth Supplemental Indenture (including the form of the Notes), dated as of July 17, 2019, between Westlake Chemical Corporation and TheBank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to Westlake's Current Report on Form 8-Kfiled on July 17, 2019, File No. 1-32260). 4.16 Supplemental Indenture dated February 1, 2018, among Westlake Chemical Corporation, the Subsidiary Guarantors (as defined therein) and TheBank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.19 to Westlake's Annual Report on Form10-K for the year ended December 31, 2017, filed on February 21, 2018, File No. 001-32260) 4.17 Paying Agency Agreement dated as of July 17, 2019, between Westlake Chemical Corporation and The Bank of New York Mellon, LondonBranch, as paying agent (incorporated by reference to Exhibit 4.4 to Westlake's Current Report on Form 8-K, filed on July 17, 2019, File No. 1-32260). Westlake and its subsidiaries are party to other long-term debt instruments not filed herewith under which the total amount of securitiesauthorized does not exceed 10% of the total assets of Westlake and its subsidiaries on a consolidated basis. Pursuant to paragraph 4(iii)(A) ofItem 601(b) of Regulation S-K, Westlake agrees to furnish a copy of such instruments to the SEC upon request. 10.1Credit Agreement, dated as of August 10, 2016, by and between Bank of America, N.A. and Westlake International Holdings II C.V.(incorporated by reference to Exhibit 10.3 to Westlake's Quarterly Report on Form 10-Q for the quarter ended on September 30, 2016, and filedon November 9, 2016, File No. 001-32260). 10.2Credit Agreement, dated as of August 23, 2016, by and among Westlake Chemical Corporation, the other borrowers and guarantors referred totherein, the lenders from time to time party thereto, the issuing banks party thereto and JPMorgan Chase Bank, National Association, asAdministrative Agent, relating to a $1 billion senior unsecured revolving credit facility (incorporated by reference to Exhibit 10.1 to Westlake'sCurrent Report on Form 8-K, filed on August 24, 2016, File No. 001-32260). 10.3Joinder Agreement, dated as of October 14, 2016, among JPMorgan Chase Bank, N.A., as Administrative Agent, and certain new guarantors (asdefined therein) (incorporated herein by reference to Exhibit 10.5 to Westlake's Annual Report on Form 10-K for the year ended December 31,2016, filed on February 22, 2017, File No. 001-32260). 93Table of ContentsExhibit No. Exhibit Index 10.4 Joinder Agreement, dated as of August 23, 2016, among Westlake Compounds, LLC, the Guarantors (as defined therein) and JPMorgan ChaseBank, N.A., as Administrative Agent (incorporated herein by reference to Exhibit 10.4 to Westlake's Annual Report on Form 10-K for the yearended December 31, 2017, filed on February 21, 2018, File No. 001-32260). 10.5 Amended and Restated Loan Agreement, dated as of July 2, 2010, by and between the Company and the Louisiana Local GovernmentEnvironmental Facilities and Community Development Authority (incorporated by reference to Westlake's Current Report on Form 8-K, filedon July 8, 2010, File No. 1-32260). 10.6 Loan Agreement, dated as of November 1, 2010, by and between the Company and the Louisiana Local Government Environmental Facilitiesand Community Development Authority, relating to the 2035 GO Zone Notes (incorporated by reference to Westlake's Current Report on Form8-K, filed on December 8, 2010, File No. 1-32260). 10.7 Loan Agreement, dated as of November 1, 2010, by and between the Company and the Louisiana Local Government Environmental Facilitiesand Community Development Authority, relating to the 2035 IKE Zone Notes (incorporated by reference to Westlake's Current Report on Form8-K, filed on December 8, 2010, File No. 1-32260). 10.8 Amended and Restated Loan Agreement, dated as of November 1, 2017, by and between the Louisiana Local Government EnvironmentalFacilities and Community Development Authority and Westlake Chemical Corporation (incorporated by reference to Exhibit 4.6 to Westlake'sCurrent Report on Form 8-K, filed on November 28, 2017, File No. 001-32260). 10.9 Senior Unsecured Revolving Credit Agreement between Westlake Chemical OpCo LP and Westlake Development Corporation (incorporatedby reference to Exhibit 10.13 to Westlake Chemical Partners LP's Registration Statement on Form S-1/A, filed on June 30, 2014, File No. 1-36567). 10.10 Senior Unsecured Revolving Credit Agreement by and among Westlake Chemical Partners LP and Westlake Chemical Finance Corporation,dated as of April 29, 2015 (incorporated by reference to Exhibit 10.1 to Westlake Chemical Partners LP's Current Report on Form 8-K filed onApril 30, 2015, File No. 1-36567). 10.11 First Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, andWestlake Chemical Finance Corporation, as lender, dated as of August 1, 2017 (incorporated by reference to Exhibit 10.1 to Westlake ChemicalPartners LP's Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, File No. 01-36567). 10.12 Second Amendment to Senior Unsecured Revolving Credit Agreement by and between Westlake Chemical Partners LP, as borrower, andWestlake Chemical Finance Corporation, as lender, dated as of November 28, 2017 (incorporated herein by reference to Exhibit 10.12 toWestlake's Annual Report on Form 10-K for the year ended December 31, 2017, filed on February 21, 2018, File No. 001-32260). 10.13Form of Registration Rights Agreement between Westlake and TTWF LP (incorporated by reference to Westlake's Registration Statement onForm S-1/A, filed on July 2, 2004). 10.14+ Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated as of May 19, 2017) (incorporated by reference toAppendix B to Westlake's Definitive Proxy Statement on Schedule 14A filed on April 7, 2017, File No.1-32260). 10.15+ Westlake Chemical Corporation Amended and Restated Annual Incentive Plan adopted by the Compensation Committee of the Board ofDirectors on March 24, 2011 (incorporated by reference to Westlake's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011,filed on May 4, 2011, File No. 1-32260). 10.16+ Form of Stock Option Award Letter for 2015 Executive Officer Awards (incorporated by reference to Exhibit 10.3 to Westlake's QuarterlyReport on Form 10-Q for the quarter ended March 31, 2015, File No. 1-32260). 10.17+ Form of Long-Term Cash Performance Award Letter for 2015 Executive Officer Awards (incorporated by reference to Exhibit 10.5 toWestlake's Quarterly Report on From 10-Q for the quarter ended March 31, 2015, File No. 1-32260). 10.18 Investment Management Agreement among Westlake Chemical Corporation, Westlake Chemical OpCo LP and Westlake Chemical PartnersLP, dated as of August 1, 2017 (incorporated herein by reference to Exhibit 10.1 to Westlake's Quarterly Report on Form 10-Q for the quarterended September 30, 2017, filed on November 7, 2017, File No. 001-32260). 94Table of ContentsExhibit No. Exhibit Index 10.19 Credit Agreement dated as of July 24, 2018, by and among Westlake Chemical Corporation, the lenders from time to time party thereto, theissuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent, relating to a $1 billion senior unsecuredrevolving credit facility (incorporated by reference to Exhibit 10.1 to Westlake's Current Report on Form 8-K filed on July 26, 2018, File No.001-32260). 10.20+ Form of Stock Option Award Letter for 2018 Executive Officer Awards (incorporated by reference to Exhibit 10.21 to Westlake's AnnualReport on Form 10-K for the year ended December 31, 2017 filed on February 21, 2018, File No. 001-32260). 10.21+ Form of Restricted Stock Unit Award Letter for 2018 Executive Officer Awards (incorporated by reference to Exhibit 10.22 to Westlake'sAnnual Report on Form 10-K for the year ended December 31, 2017 filed on February 21, 2018, File No. 001-32260). 10.22+ Form of Special Incentive Award Letter for 2018 Executive Officer Awards (incorporated by reference to Exhibit 10.24 to Westlake's AnnualReport on Form 10-K for the year ended December 31, 2017 filed on February 21, 2018, File No. 001-32260). 10.23+ Form of Performance Stock Unit Award Letter for 2019 Executive Officer Awards (incorporated by reference to Exhibit 10.25 to Westlake'sAnnual Report on Form 10-K for the year ended December 31, 2018 filed on February 20, 2019, File No. 001-32260). 21† Subsidiaries of Westlake. 23.1† Consent of PricewaterhouseCoopers LLP. 31.1† Rule 13a-14(a) / 15d-14(a) Certification (Principal Executive Officer). 31.2† Rule 13a-14(a) / 15d-14(a) Certification (Principal Financial Officer). 32.1†† Section 1350 Certification (Principal Executive Officer and Principal Financial Officer). 101.INS† XBRL Instance Document-The instance document does not appear in the interactive data file because its XBRL tags are embedded within theInline XBRL document. 101.SCH† XBRL Taxonomy Extension Schema Document. 101.CAL† XBRL Taxonomy Extension Calculation Linkbase Document. 101.DEF† XBRL Taxonomy Extension Definition Linkbase Document. 101.LAB† XBRL Taxonomy Extension Label Linkbase Document. 101.PRE† XBRL Taxonomy Extension Presentation Linkbase Document. 104 Cover Page Interactive Data File - The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags areembedded within the Inline XBRL document and contained in Exhibit 101.______________________________†Filed herewith.††Furnished herewith.+Management contract, compensatory plan orarrangement.Item 16. Form 10-K Summary.None.95Table of ContentsSIGNATURESPursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on itsbehalf by the undersigned, thereunto duly authorized. WESTLAKE CHEMICAL CORPORATION Date:February 19, 2020 /S/ ALBERT CHAO Albert Chao, President and Chief Executive OfficerPursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrantand in the capacities and on the dates indicated.Signature Title Date /S/ ALBERT CHAO President and Chief Executive Officer (Principal Executive Officer) February 19, 2020Albert Chao /S/ M. STEVEN BENDER Executive Vice President and Chief Financial Officer (Principal Financial Officer) February 19, 2020M. Steven Bender /S/ GEORGE J. MANGIERI Senior Vice President and Chief Accounting Officer (Principal Accounting Officer) February 19, 2020George J. Mangieri /S/ JAMES CHAO Chairman of the Board of Directors February 19, 2020James Chao /S/ ALBERT CHAO Director February 19, 2020Albert Chao /S/ DAVID T. CHAO Director February 19, 2020David T. Chao /S/ JOHN CHAO Director February 19, 2020John Chao /S/ MICHAEL J. GRAFF Director February 19, 2020Michael J. Graff /S/ MARIUS A. HAAS Director February 19, 2020Marius A. Haas /S/ DOROTHY C. JENKINS Director February 19, 2020Dorothy C. Jenkins /S/ MAX L. LUKENS Director February 19, 2020Max L. Lukens /S/ MARK A. MCCOLLUM Director February 19, 2020Mark A. McCollum /S/ R. BRUCE NORTHCUTT Director February 19, 2020R. Bruce Northcutt /S/ JEFFREY W. SHEETS Director February 19, 2020Jeffrey W. Sheets 96EXHIBIT 4.1DESCRIPTION OF THE REGISTRANT’S SECURITIESREGISTERED PURSUANT TO SECTION 12 OF THESECURITIES EXCHANGE ACT OF 1934Common StockThe following is a summary of Westlake Chemical Corporation’s (“Westlake,” “we,” “us” and “our”) common stock, par value $0.01 per share, which islisted on the New York Stock Exchange under the symbol “WLK.” This summary does not purport to be complete and is subject to and qualified by reference toour amended and restated certificate of incorporation and amended and restated bylaws and to provisions of applicable law.Each share of common stock entitles the holder to one vote on all matters on which holders are permitted to vote, including the election of directors.There are no cumulative voting rights. Accordingly, holders of a majority of the total votes entitled to vote in an election of directors will be able to elect all of thedirectors standing for election. Subject to preferences that may be applicable to any outstanding preferred stock, the holders of the common stock will shareequally on a per share basis any dividends when, as and if declared by the Board of Directors out of funds legally available for that purpose. If we are liquidated,dissolved or wound up, the holders of our common stock will be entitled to a ratable share of any distribution to stockholders, after satisfaction of all of ourliabilities and of the prior rights of any outstanding class of our preferred stock. Our common stock has no preemptive or conversion rights or other subscriptionrights. There are no redemption or sinking fund provisions applicable to our common stock. All outstanding shares of our common stock are fully paid andnonassessable.Election and Removal of DirectorsOur Board of Directors consists of between one and 15 directors, excluding any directors elected by holders of preferred stock pursuant to provisionsapplicable in the case of defaults. The exact number of directors will be fixed from time to time by resolution of the Board. Our Board of Directors is divided intothree classes serving staggered three-year terms, with only one class being elected each year by our stockholders. At each annual meeting of stockholders, directorswill be elected to succeed the class of directors whose terms have expired. This system of electing and removing directors may discourage a third party frommaking a tender offer or otherwise attempting to obtain control of us, because it generally makes it more difficult for stockholders to replace a majority of thedirectors. In addition, no director may be removed except for cause, and directors may be removed for cause by an affirmative vote of shares representing amajority of the shares then entitled to vote at an election of directors. Any vacancy occurring on the Board of Directors and any newly created directorship mayonly be filled by the affirmative vote of a majority of the remaining directors in office.Stockholder MeetingsOur amended and restated certificate of incorporation and our amended and restated bylaws provide that special meetings of our stockholders may becalled only by the chairman of our Board of Directors or a majority of the directors. Our amended and restated certificate of incorporation and our amended andrestated bylaws specifically deny any power of any other person to call a special meeting.Stockholder Action by Written ConsentOur amended and restated certificate of incorporation and our amended and restated bylaws provide that holders of our common stock will not be able toact by written consent without a meeting, unless such consent is unanimous.Amendment of Certificate of IncorporationThe provisions of our amended and restated certificate of incorporation described above under “—Election and Removal of Directors,” “—StockholderMeetings” and “—Stockholder Action by Written Consent” may be amended only by the affirmative vote of holders of at least 75% of the voting power of ouroutstanding shares of voting stock, voting together as a single class. The affirmative vote of holders of at least a majority of the voting power of our outstandingshares of voting stock is generally required to amend other provisions of our amended and restated certificate of incorporation.Amendment of BylawsOur amended and restated bylaws may generally be altered, amended or repealed, and new bylaws may be adopted, with:•the affirmative vote of a majority of directors present at any regular or special meeting of the Board of Directors called for that purpose, providedthat any alteration, amendment or repeal of, or adoption of any bylaw inconsistent with specified provisions of the bylaws, including those related tospecial and annual meetings of stockholders, action of stockholders by written consent, classification of the Board of Directors, nomination ofdirectors, special meetings of directors, removal of directors, committees of the Board of Directors and indemnification of directors and officers,requires the affirmative vote of at least 75% of all directors in office at a meeting called for that purpose; or•the affirmative vote of holders of 75% of the voting power of our outstanding shares of voting stock, voting together as a singleclass.Other Limitations on Stockholder ActionsOur amended and restated bylaws also impose some procedural requirements on stockholders who wish to:•make nominations in the election ofdirectors;•propose that a director beremoved;•propose any repeal or change in our bylaws;or•propose any other business to be brought before an annual or special meeting ofstockholders.Under these procedural requirements, in order to bring a proposal before a meeting of stockholders, a stockholder must deliver timely notice of a proposalpertaining to a proper subject for presentation at the meeting to our corporate secretary along with the following:•a description of the business or nomination to be brought before the meeting and the reasons for conducting such business at themeeting;•the stockholder’s name and address;•the number of shares of our stock beneficially owned by the stockholder and evidence of such ownership;and•the names and addresses of all persons with whom the stockholder is acting in concert and a description of all arrangements and understandings withthose persons, and the number of shares of our stock such persons beneficially own.To be timely, a stockholder must generally deliver notice:•in connection with an annual meeting of stockholders, not less than 120 nor more than 180 days prior to the date on which the annual meeting ofstockholders was held in the immediately preceding year, but in the event that the date of the annual meeting is more than 30 days before or morethan 60 days after the anniversary date of the preceding annual meeting of stockholders, a stockholder notice will be timely if received by us not laterthan the close of business on the later of (1) the 120th day prior to the annual meeting and (2) the 10th day following the day on which we firstpublicly announce the date of the annual meeting; or•in connection with the election of a director at a special meeting of stockholders, not less than 40 nor more than 60 days prior to the date of thespecial meeting, but in the event that less than 55 days’ notice or prior public disclosure of the date of the special meeting of the stockholders is givenor made to the stockholders, a stockholder notice will be timely if received by us not later than the close of business on the 10th day following the dayon which a notice of the date of the special meeting was mailed to the stockholders or the public disclosure of that date was made.In order to submit a nomination for our Board of Directors, a stockholder must also submit any information with respect to the nominee that we would berequired to include in a proxy statement, as well as some other information. If a stockholder fails to follow the required procedures, the stockholder’s proposal ornominee will be ineligible and will not be voted on by our stockholders.Limitation on Liability of DirectorsOur amended and restated certificate of incorporation provides that no director will be personally liable to us or our stockholders for monetary damagesfor breach of fiduciary duties as a director, except as required by applicable law, as in effect from time to time. Currently, Delaware law requires that liability beimposed for the following:•any breach of the director’s duty of loyalty to our company or ourstockholders;•any act or omission not in good faith or which involved intentional misconduct or a knowing violation oflaw;•unlawful payments of dividends or unlawful stock repurchases or redemptions as provided in Section 174 of the Delaware General Corporation Law;and•any transaction from which the director derived an improper personalbenefit.Our amended and restated bylaws provide that, to the fullest extent permitted by law, we will indemnify any officer or director of our company against alldamages, claims and liabilities arising out of the fact that the person is or was our director or officer, or served any other enterprise at our request as a director,officer, employee, agent or fiduciary. We will reimburse the expenses, including attorneys’ fees, incurred by a person indemnified by this provision when wereceive an undertaking to repay such amounts if it is ultimately determined that the person is not entitled to be indemnified by us. Amending this provision will notreduce our indemnification obligations relating to actions taken before an amendment.Anti-Takeover Effects of Some ProvisionsSome provisions of our amended and restated certificate of incorporation and amended and restated bylaws could make the following more difficult:•acquisition of control of us by means of a proxy contest or otherwise;or•removal of our incumbent officers anddirectors.These provisions, as well as our ability to issue preferred stock, are designed to discourage coercive takeover practices and inadequate takeover bids.These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with our Board of Directors. We believe that the benefitsof increased protection give us the potential ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure us, and that thebenefits of this increased protection outweigh the disadvantages of discouraging those proposals, because negotiation of those proposals could result in animprovement of their terms.Transactions and Corporate OpportunitiesOur amended and restated certificate of incorporation includes provisions that regulate and define the conduct of specified aspects of the business andaffairs of our company. These provisions serve to determine and delineate the respective rights and duties of our company, our principal stockholder, TTWF LP,and its direct and indirect equity owners and directors, officers, employees, partners or equity owners of such entities (the “principal stockholder affiliates”), andsome of our directors and officers in anticipation of the following:•the principal stockholder affiliates serving as our directors and/orofficers;•the principal stockholder affiliates engaging in lines of business that are the same as, or similar to, our lines ofbusiness;•the principal stockholder affiliates having an interest in the same areas of corporate opportunity as we have;and•we and the principal stockholder affiliates engaging in material businesstransactions.We may enter into agreements with the principal stockholder affiliates to engage in any transaction. We may also enter into agreements with the principalstockholder affiliates to compete or not to compete with each other, including agreements to allocate, or to cause our directors, officers and employees and theprincipal stockholder affiliates to allocate, opportunities between the principal stockholder affiliates and us. Our amended and restated certificate of incorporationprovides that no such agreement will be considered contrary to any fiduciary duty of the principal stockholder affiliates, as our direct and indirect controllingstockholders, or our directors, officers or employees. Neither the principal stockholder affiliates nor any of our directors, officers or employees who are alsoprincipal stockholder affiliates are under any fiduciary duty to us to refrain from acting on our behalf or on behalf of the principal stockholder affiliates in respectof any such agreement or transaction. These provisions are generally subject to the corporate opportunity obligations described below with which the principalstockholder affiliates and our officers and directors who are also principal stockholder affiliates must comply.Under our amended and restated certificate of incorporation, the principal stockholder affiliates have no duty to refrain from engaging in activities or linesof business similar to ours or from doing business with any of our clients, customers or vendors and, except as discussed in the above paragraph, the principalstockholder affiliates will not be liable to us or our stockholders for breach of any fiduciary duty as a stockholder by reason of any of these activities. In addition, ifthe principal stockholder affiliates or one of our directors or officers who is also a principal stockholder affiliate acquires knowledge of a potential transaction ormatter which may be a corporate opportunity for both our company and the principal stockholder affiliates, then neither the principal stockholder affiliates nor anysuch person will have a duty to communicate or offer this corporate opportunity to us and will not be liable to us or our stockholders for breach of any fiduciaryduty by reason of the fact that the principal stockholder affiliates pursue or acquire the corporate opportunity for themselves, direct the corporate opportunity toanother person or do not communicate information regarding the corporate opportunity to us, so long as the principal stockholder affiliates act in a mannerconsistent with the following policy: A corporate opportunity offered to the principal stockholder affiliates or to any person who is one of our officers or directorsand who is also a principal stockholder affiliate will belong to the principal stockholder affiliates, unless the opportunity was expressly offered in writing to theprincipal stockholder affiliates solely in their capacity as direct and indirect stockholders of our company or to that person solely in his or her capacity as one ofour directors or officers.Anyone becoming one of our stockholders will be deemed to have notice of and consented to these provisions of our amended and restated certificate ofincorporation. Our amended and restated certificate of incorporation provides that in no event shall any amendment of these provisions subject any principalstockholder affiliate to liability for any act or omission occurring prior to such amendment for which such person would be deemed not to be liable under theseprovisions prior to such amendment.Delaware Business Combination StatuteWe have expressly elected not to be subject to Section 203 of the General Corporation Law of the State of Delaware, which is described below. However,our stockholders can amend our amended and restated certificate of incorporation and amended and restated bylaws to elect to be subject to Section 203. Section203 provides that, subject to specified exceptions, an interested stockholder of a Delaware corporation is not permitted to engage in any business combination,including mergers or consolidations or acquisitions of additional shares of the corporation, with the corporation for a three-year period following the time thatstockholder became an interested stockholder, unless one of the following conditions is met:•prior to the time the stockholder became an interested stockholder, the Board of Directors approved either the business combination or the transactionthat resulted in the stockholder becoming an interested stockholder;•upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least85% of the voting stock of the corporation outstanding at the time the transaction commenced, other than statutorily excluded shares; or•on or subsequent to the time the stockholder became an interested stockholder, the business combination is approved by the Board of Directors andauthorized at an annual or special meeting of stockholders by the affirmative vote of at least 66 2⁄3% of the outstanding voting stock which is notowned by the interested stockholder.Except as otherwise set forth in Section 203, “interested stockholder” means:•any person that is the owner of 15% or more of the outstanding voting stock of the corporation, or is an affiliate or associate of the corporation andwas the owner of 15% or more of the outstanding voting stock of the corporation at any time within three years immediately prior to the date ofdetermination; and•the affiliates and associates of any suchperson.If we ever become subject to Section 203, it may be more difficult for a person who is an interested stockholder to effect various business combinationswith us for the applicable three-year period. Section 203, if it becomes applicable, also may have the effect of preventing changes in our management. It is possiblethat Section 203, if it becomes applicable, could make it more difficult to accomplish transactions which our stockholders may otherwise deem to be in their bestinterests. The provisions of Section 203, if it becomes applicable, may cause persons interested in acquiring us to negotiate in advance with our Board of Directors.The restrictions on business combinations set forth in Section 203 are not applicable to the principal stockholder so long as the principal stockholder holds 15% ormore of our outstanding shares of common stock. Because we are not currently subject to Section 203, the principal stockholder, as a controlling stockholder, mayfind it easier to sell its controlling interest to a third party because Section 203 would not apply to the third party.1.625% Senior Notes due 2029The following is a summary of our 1.625% senior notes due 2029, which are listed on the New York Stock Exchange under the symbol “WLK29.” Thissummary does not purport to be complete and is subject to and qualified by reference to the indenture governing the notes.GeneralWestlake issued the notes under an indenture, dated as of January 1, 2006, among itself, the potential subsidiary guarantors listed therein and The Bank ofNew York Mellon Trust Company, N.A. (as successor to JPMorgan Chase Bank, National Association), as trustee, as supplemented and amended by a twelfthsupplemental indenture entered into on July 17, 2019. The terms of the notes include those stated in the indenture and those made part of the indenture by referenceto the Trust Indenture Act of 1939, as amended.The indenture does not limit the amount of debt securities that may be issued under the indenture. We may issue additional debt securities under theindenture from time to time in one or more series. We may from time to time, without giving notice to or seeking the consent of the holders of the notes, issueadditional notes having the same terms (except for the issue date, and, in some cases, the public offering price and, to the extent applicable, the first date of interestaccrual and the first interest payment date) as, and ranking equally and ratably with, the notes; provided that any additional notes shall be issued under a separateCUSIP or ISIN number unless the additional notes are issued pursuant to a “qualified reopening” of the original series, are otherwise treated as part of the same“issue” of debt instruments as the original series or are issued with no more than a de minimis amount of original discount, in each case for U.S. federal incometax purposes. Any additional notes having such similar terms, together with the notes, will constitute a single series of securities under the indenture, including forpurposes of voting. No such additional notes may be issued if an “event of default” (as such term is defined below) has occurred and is continuing with respect tothe notes.The registered holder of a note will be treated as the owner of the note for all purposes. Only registered holders will have rights under the indenture.Principal, Maturity and InterestWestlake issued €700,000,000 in aggregate principal amount of notes in July 2019. The notes will mature on July 17, 2029. Interest on the notes accruesat the rate of 1.625% per annum and is payable annually in arrears on July 17 of each year, commencing on July 17, 2020. Westlake will make each interestpayment in accordance with the provisions set forth under “—Payments and Paying Agents” below.Interest on the notes accrues from the date of original issuance or, if interest has already been paid or duly provided for, from the date it was most recentlypaid or duly provided for. Interest on the notes is computed on the basis of the actual number of days in the period for which interest is being calculated and theactual number of days from and including the last date on which interest was paid on the notes (or from July 17, 2019, if no interest has been paid on the notes), tobut excluding the next scheduled interest payment date. This payment convention is referred to as ACTUAL/ACTUAL (ICMA) as defined in the rulebook of theInternational Capital Market Association.If the principal of or any premium or interest on the notes is payable on a day that is not a business day, the payment will be made on the followingbusiness day and no interest shall accrue for the intervening period. For these purposes, a “business day” is any day that is: (a) not a Saturday, a Sunday or a day onwhich banking institutions in any of New York, New York, Houston, Texas or London, United Kingdom is authorized or obligated by law, regulation or executiveorder to remain closed; and (b) a day on which commercial banking institutions are open for business and carrying out transactions in Euros in the United Kingdomand in the country in which the paying agent has its specified office and is a day on which the Trans-European Automated Real Time Gross Settlement ExpressTransfer System is operating.The notes were issued in denominations of €100,000 and integral multiples of €1,000 in excess thereof in book-entry form only. See “—Book-Entry,Clearance and Settlement.”Issuance in EuroInitial holders were required to pay for the notes in Euros, and all payments of interest and principal, including payments made upon any redemption ofthe notes, will be payable in Euros. If the Euro is unavailable to us due to the imposition of exchange controls or other circumstances beyond our control or if theEuro is no longer being used by the then member states of the European Monetary Union that have adopted the Euro as their currency or for the settlement oftransactions by public institutions of or within the international banking community, then all payments in respect of the notes will be made in dollars until the Eurois again available to us or so used. The amount payable on any date in Euros will be converted into dollars on the basis of the most recently available marketexchange rate for Euros. Any payment in respect of the notes so made in dollars will not constitute an event of default under the notes or the indenture governingthe notes. Neither the trustee nor the paying agent shall have any responsibility for any calculation or conversion in connection with the foregoing.RankingThe notes are senior unsecured obligations of Westlake and rank equally in right of payment with all existing and future unsecured and unsubordinatedobligations of Westlake.The notes effectively rank junior to all existing and future secured indebtedness of Westlake to the extent of the value of the assets securing suchindebtedness. In the event of any distribution or payment of Westlake’s assets in any foreclosure, dissolution, winding-up, liquidation, reorganization or otherbankruptcy proceeding, holders of secured indebtedness will have prior claim to such assets that constitute their collateral. Holders of the notes will participateratably with all holders of our senior unsecured indebtedness, and potentially with all of our other general creditors, based upon the respective amounts owed toeach holder or creditor, in our remaining assets.In addition, none of our subsidiaries guarantee the notes. We may in the future incur indebtedness guaranteed by our subsidiaries. In the event of abankruptcy, liquidation or reorganization of any of these subsidiaries, that subsidiary will pay the holders of its debt, the holders of any of our debt which isguaranteed by such subsidiary and its trade creditors before it will be able to distribute any of its assets to us. Accordingly, the notes are effectively subordinated tocreditors, including trade creditors, if any, of our subsidiaries.Optional RedemptionThe notes are redeemable at our option, in whole or in part, at any time and from time to time prior to April 17, 2029 (three months prior to the maturitydate of the notes (the “Par Call Date”)), in principal amounts of €1,000 and integral multiples of €1,000 in excess thereof, provided that the unredeemed portion ofa note must be in a minimum principal amount of €100,000, for a redemption price equal to the greater of:•100% of the principal amount of the notes to be redeemed;and•the sum of the present values of the Remaining Scheduled Payments on the notes being redeemed that would be due if the notes matured on the ParCall Date (excluding accrued and unpaid interest to the redemption date), discounted to the redemption date on an annual basis (ACTUAL/ACTUAL(ICMA)) at the applicable Comparable Government Bond Rate plus 30 basis points,plus accrued and unpaid interest on the notes being redeemed to the redemption date.In addition, at any time on or after the Par Call Date, the notes will be redeemable at our option, in whole or in part, in principal amounts of €1,000 andintegral multiples of €1,000 in excess thereof, provided that the unredeemed portion of a note must be in a minimum principal amount of €100,000, at aredemption price equal to 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to the redemption date.“Comparable Government Bond” means, in relation to any Comparable Government Bond Rate calculation, at the discretion of an independentinvestment bank selected by us, a German government bond whose maturity is closest to the maturity of the notes to be redeemed, or if such independentinvestment bank in its discretion determines that such similar bond is not in issue, such other German government bond as such independent investment bank may,with the advice of three brokers of, and/or market makers in, German government bonds selected by us, determine to be appropriate for determining theComparable Government Bond Rate.“Comparable Government Bond Rate” means, with respect to any redemption date, the price, expressed as a percentage (rounded to three decimal places,with 0.0005 being rounded upwards), at which the gross redemption yield on the notes to be redeemed, if they were to be purchased at such price on the thirdbusiness day prior to the date fixed for redemption, would be equal to the gross redemption yield on such business day of the Comparable Government Bond (asdefined above) on the basis of the middle market price of the Comparable Government Bond prevailing at 11:00 a.m. (London time) on such business day asdetermined by an independent investment bank selected by us.“Remaining Scheduled Payments” means the remaining scheduled payments of the principal of and interest on each note to be redeemed that would bedue after the related redemption date but for such redemption.We will deliver notice of a redemption not less than 10 days nor more than 60 days before the redemption date to holders of notes to be redeemed. Oncenotice of redemption is sent, the notes called for redemption will become due and payable on the redemption date at the applicable redemption price. A notice ofredemption may not be conditional.If we elect to redeem less than all of the notes, and such notes are at the time represented by a global note, then the particular notes to be redeemed will beselected in accordance with the procedures of the Clearing Systems. If we elect to redeem less than all of the notes, and any of such notes are not represented by aglobal note, then the notes to be redeemed shall be selected by lot or pro rata. Unless there is a default in payment of the redemption price, on and after theredemption date, interest will cease to accrue on the notes or portions thereof called for redemption.We may at any time, and from time to time, purchase the notes at any price or prices in the open market, through negotiated transactions, by tender offeror otherwise.Redemption for Tax ReasonsIf, as a result of any change in, or amendment to, the laws (or any regulations or rulings promulgated under the laws) of the United States (or any taxingauthority in the United States), or any change in, or amendment to, an official position regarding the application or interpretation of such laws, regulations orrulings, which change or amendment is announced and becomes effective on or after the issue date of the notes, we determine (based on an opinion issued to us bycounsel of recognized standing with respect to U.S. federal income tax matters) that we become obligated to pay additional amounts as described under the heading“—Payment of Additional Amounts” with respect to the notes, then we may at any time at our option redeem, in whole, but not in part, the notes on not less than30 nor more than 60 days’ prior notice, at a redemption price equal to 100% of their principal amount, together with accrued and unpaid interest on the notes to,but not including, the date fixed for redemption.Payment of Additional AmountsWe will, subject to the exceptions and limitations set forth below, pay as additional interest on the notes such additional amounts as are necessary in orderthat the net payment of the principal of and interest on the notes to a holder that is not a United States person (as defined below), after withholding or deduction forany present or future tax, assessment or other governmental charge imposed by the United States or a taxing authority in the United States, will not be less than theamount provided in the notes to be then due and payable; provided, however, that the foregoing obligation to pay additional amounts shall not apply:(1) to any tax, assessment or other governmental charge that is imposed solely by reason of the holder (or the beneficial owner for whose benefit suchholder holds such note), or a fiduciary, settlor, beneficiary, member or shareholder of the holder if the holder is an estate, trust, partnership or corporation, or aperson holding a power over an estate or trust administered by a fiduciary holder, being considered as:(a) being or having been engaged in a trade or business in the United States or having or having had a permanent establishment in the UnitedStates;(b) having a current or former connection with the United States (other than a connection arising solely as a result of the ownership of the notesor the receipt of any payment or the enforcement of any rights thereunder), including being or having been a citizen or resident of the United States;(c) being or having been a personal holding company, a passive foreign investment company or a controlled foreign corporation for UnitedStates federal income tax purposes or a corporation that has accumulated earnings to avoid United States federal income tax;(d) being or having been a “10-percent shareholder” of the Company as defined in section 871(h)(3) of the United States Internal Revenue Codeof 1986, as amended (the “Code”), or any successor provision; or(e) being a bank receiving payments on an extension of credit made pursuant to a loan agreement entered into in the ordinary course of its tradeor business;(2) to any holder that is not the sole beneficial owner of the notes, or a portion of the notes, or that is a fiduciary, partnership or limited liability company,but only to the extent that a beneficial owner with respect to the holder, a beneficiary or settlor with respect to the fiduciary, or a beneficial owner or member of thepartnership or limited liability company would not have been entitled to the payment of an additional amount had the beneficiary, settlor, beneficial owner ormember received directly its beneficial or distributive share of the payment;(3) to any tax, assessment or other governmental charge that would not have been imposed but for the failure of the holder or any other person to complywith certification, identification or information reporting requirements concerning the nationality, residence, identity or connection with the United States of theholder or beneficial owner of the notes, if compliance is required by statute, by regulation of the United States or any taxing authority therein or as a preconditionto exemption from such tax, assessment or other governmental charge;(4) to any tax, assessment or other governmental charge that is imposed otherwise than by withholding by us or an applicable withholding agent from thepayment;(5) to any estate, inheritance, gift, sales, transfer, wealth, capital gains or personal property tax or similar tax, assessment or other governmental charge;(6) to any tax, assessment or other governmental charge that would not have been imposed but for the presentation by the holder of any note, wherepresentation is required, for payment on a date more than 30 days after the date on which payment became due and payable or the date on which payment thereofis duly provided for, whichever occurs later;(7) to any tax, assessment or other governmental charge imposed under Sections 1471 through 1474 of the Code (or any amended or successorprovisions), any current or future regulations or official interpretations thereof, any agreement entered into pursuant to Section 1471(b) of the Code or any fiscal orregulatory legislation, rules or practices adopted pursuant to any intergovernmental agreement entered into in connection with the implementation of such sectionsof the Code; or(8) in the case of any combination of items (1), (2), (3), (4), (5), (6) and (7).The notes are subject in all cases to any tax, fiscal or other law or regulation or administrative or judicial interpretation applicable to the notes. Except asspecifically provided under this heading “—Payment of Additional Amounts,” we will not be required to make any payment for any tax, assessment or othergovernmental charge imposed by any government or a political subdivision or taxing authority of or in any government or political subdivision.As used under this heading “—Payment of Additional Amounts” and under the heading “—Redemption for Tax Reasons”, the term “United States”means the United States of America, the states of the United States, and the District of Columbia, and the term “United States person” means any individual who isa citizen or resident of the United States for United States federal income tax purposes, a corporation, partnership or other entity created or organized in or underthe laws of the United States, any state of the United States or the District of Columbia, or any estate or trust the income of which is subject to United Statesfederal income taxation regardless of its source.Sinking FundThe notes are not entitled to any sinking fund.Change of Control Triggering EventUpon the occurrence of a Change of Control Triggering Event, unless we have exercised our right to redeem the notes as described under “—OptionalRedemption” in accordance with the indenture, each holder of the notes will have the right to require us to purchase all or a portion (€1,000 or an integral multipleof €1,000 in excess thereof) of such holder’s notes pursuant to the offer described below (the “Change of Control Offer”), at a purchase price equal to 101% of theprincipal amount thereof plus accrued and unpaid interest, if any, to the date of purchase (the “Change of Control Payment”), subject to the rights of holders of thenotes on the relevant record date to receive interest due on the relevant interest payment date; provided that the principal amount of a note remaining outstandingafter a repurchase in part shall be €100,000 or an integral multiple of €1,000 in excess thereof.Within 30 days following the date upon which the Change of Control Triggering Event occurred, or at our option, prior to any Change of Control butafter the public announcement of the pending Change of Control, we will be required to deliver a notice to each holder of the notes not redeemed, with a copy tothe trustee, which notice will govern the terms of the Change of Control Offer. Such notice will, among other things, state the purchase date, which must be noearlier than 30 days nor later than 60 days from the date such notice is sent, other than as may be required by applicable law (the “Change of Control PaymentDate”), describe the transaction or transactions constituting the Change of Control Triggering Event and offer to repurchase the notes. The notice, if sent prior tothe date of consummation of the Change of Control, will state that the Change of Control Offer is conditioned on the Change of Control being consummated on orprior to the Change of Control Payment Date.On the Change of Control Payment Date, we will, to the extent lawful:•accept or cause a third party to accept for payment all notes or portions of notes properly tendered pursuant to the Change of ControlOffer;•deposit or cause a third party to deposit with the paying agent an amount equal to the Change of Control Payment in respect of all notes or portions ofnotes properly tendered; and•deliver or cause to be delivered to the trustee the notes to be redeemed properly accepted together with an officers’ certificate stating the aggregateprincipal amount of notes or portions of notes being repurchased and that all conditions precedent to the Change of Control Offer and to therepurchase by us of notes pursuant to the Change of Control Offer have been complied with.We will not be required to make a Change of Control Offer with respect to the notes if (1) a third party makes such an offer in the manner, at the timesand otherwise in compliance with the requirements for such an offer otherwise required to be made by us and such third party purchases all such notes properlytendered and not withdrawn under its offer or (2) a notice of redemption has been given to the holders of all of the notes in accordance with the terms of theindenture, unless and until there is a default in payment of the redemption price.A Change of Control Offer may be made in advance of a Change of Control, conditional upon such Change of Control, if a definitive agreement is inplace with respect to the Change of Control at the time of making of the Change of Control Offer.We will comply in all material respects with the requirements of Rule 14e-1 under the Exchange Act, and any other securities laws and regulationsthereunder to the extent those laws and regulations are applicable in connection with the repurchase of the notes as a result of a Change of Control TriggeringEvent. To the extent that the provisions of any such securities laws or regulations conflict with the Change of Control Offer provisions of the notes, we will complywith those securities laws and regulations and will not be deemed to have breached our obligations under the Change of Control Offer provisions of the notes byvirtue of any such conflict.For purposes of the foregoing discussion of a Change of Control Offer, the following definitions are applicable:“Below Investment Grade Rating Event” means the rating on the notes is lowered and as a result the notes cease to be rated Investment Grade by each ofthe Rating Agencies on any date during the period (the “Trigger Period”) commencing on the earlier of (a) the occurrence of a Change of Control and (b) the firstpublic announcement by us of any Change of Control (or pending Change of Control) and ending 60 days following the consummation of such Change of Control(which Trigger Period will be extended if the rating of the notes is under publicly announced consideration for possible downgrade by any Rating Agency on such60th day, such extension to last with respect to each Rating Agency until the date on which such Rating Agency considering such possible downgrade either (x)rates the notes below Investment Grade or (y) publicly announces that it is no longer considering the notes for possible downgrade; provided, that no suchextension will occur if on such 60th day the notes are rated Investment Grade not subject to review for possible downgrade by any Rating Agency); provided, thata rating event will not be deemed to have occurred in respect of a particular Change of Control (and thus will not be deemed a Below Investment Grade RatingEvent for purposes of the definition of Change of Control Triggering Event) if each Rating Agency making the reduction in rating does not publicly announce orconfirm or inform the trustee in writing at our request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising asa result of, or in respect of, the Change of Control (whether or not the applicable Change of Control has occurred at the time of the Below Investment Grade RatingEvent). If any Rating Agency withdraws its rating on the notes or otherwise ceases to provide a rating on the notes on any day during the Trigger Period for anyreason and we have not selected a replacement Rating Agency pursuant to the terms of the indenture, the rating of such Rating Agency shall be deemed to bebelow an Investment Grade Rating on such day.“Beneficial Owner” has the meaning assigned to such term in Rule 13d-3 and Rule 13d-5 under the Exchange Act, except that in calculating thebeneficial ownership of any particular “person” as such term is used in Section 13(d)(3) of the Exchange Act, such “person” will be deemed to have beneficialownership of all securities that such “person” has the right to acquire by conversion or exercise of other securities, whether such right is currently exercisable or isexercisable only upon the occurrence of a subsequent condition.“Change of Control” means the occurrence of any of the following after the date of issuance of the notes:•the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of relatedtransactions, of all or substantially all of the assets of Westlake and its Subsidiaries taken as a whole to any “person” or “group” (as those terms areused in Section 13(d)(3) of the Exchange Act) other than to Westlake or one of its Subsidiaries;•the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” or “group”(as those terms are used in Section 13(d)(3) of the Exchange Act, it being agreed that an employee of Westlake or any of its Subsidiaries for whomshares are held under an employee stock ownership, employee retirement, employee savings or similar plan and whose shares are voted inaccordance with the instructions of such employee shall not be a member of a “group” (as that term is used in Section 13(d)(3) of the Exchange Act)solely because such employee’s shares are held by a trustee under said plan) becomes the ultimate Beneficial Owner, directly or indirectly, of ourVoting Stock representing more than 50% of the voting power of our outstanding Voting Stock;•we consolidate with, or merge with or into, any Person, or any Person consolidates with, or merges with or into, us, in any such event pursuant to atransaction in which any of our outstanding Voting Stock or Voting Stock of such other Person is converted into or exchanged for cash, securities orother property, other than any such transaction where our Voting Stock outstanding immediately prior to such transaction constitutes, or is convertedinto or exchanged for, Voting Stock representing more than 50% of the voting power of the Voting Stock of the surviving Person or its parentimmediately after giving effect to such transaction;•during any period of 24 consecutive calendar months, the majority of the members of our board of directors shall no longer be composed ofindividuals (a) who were members of our board of directors on the first day of such period or (b) whose election or nomination to our board ofdirectors was approved by individuals referred to in clause (a) above constituting, at the time of such election or nomination, at least a majority of ourboard of directors or, if directors are nominated by a committee of our board of directors, constituting at the time of such nomination, at least amajority of such committee; or•the adoption of a plan relating to our liquidation ordissolution.Notwithstanding the foregoing, a transaction will not be deemed to involve a Change of Control if (1) we become a direct or indirect wholly-ownedsubsidiary of a holding company and (2) the direct or indirect holders of the Voting Stock of such holding company immediately following that transaction aresubstantially the same as the holders of our Voting Stock immediately prior to that transaction.“Change of Control Triggering Event” means the occurrence of both a Change of Control and a Below Investment Grade Rating Event. Notwithstandingthe foregoing, no Change of Control Triggering Event will be deemed to have occurred in connection with any particular Change of Control unless and until suchChange of Control has actually been consummated.“Investment Grade” means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating category of Moody’s) and a rating of BBB-or better by S&P (or its equivalent under any successor rating category of S&P), and the equivalent investment grade credit rating from any replacement ratingagency or rating agencies selected by us under the circumstances permitting us to select a replacement rating agency and in the manner for selecting a replacementrating agency, in each case as set forth in the definition of “Rating Agency.”“Moody’s” means Moody’s Investors Service, Inc., a subsidiary of Moody’s Corporation, and its successors.“Rating Agency” means each of Moody’s and S&P; provided, that if any of Moody’s or S&P ceases to provide rating services to issuers or investors, wemay appoint another “nationally recognized statistical rating organization” (as defined under the Exchange Act) as a replacement for such Rating Agency;provided, that we shall give written notice of such appointment to the trustee.“S&P” means S&P Global Ratings, a division of S&P Global Inc., and its successors.“Voting Stock” of any specified Person as of any date means the capital stock (or comparable equity interests) of such Person that is at the time entitled tovote generally in the election of the board of directors (or members of the governing body) of such Person.For purposes of the notes, “Person” includes any individual, corporation, limited liability company, partnership, joint venture, association, joint stockcompany, trust, estate, unincorporated organization or government or any agency or political subdivision thereof or any other entity.The definition of Change of Control includes a phrase relating to the direct or indirect sale, lease, transfer, conveyance or other disposition of “all orsubstantially all” of the properties or assets of Westlake and its Subsidiaries taken as a whole. Although there is a limited body of case law interpreting the phrase“substantially all,” there is no precise, established definition of the phrase under applicable law. Accordingly, the applicability of the requirement that we offer torepurchase the notes as a result of a sale, lease, transfer, conveyance or other disposition of less than all of the assets of Westlake and its Subsidiaries taken as awhole to another Person or group may be uncertain.Certain CovenantsThe indenture will contain, among others, the following covenants:Restrictions on Secured DebtUnder the indenture, Westlake will not, and we will not permit any Restricted Subsidiary (as defined below) to, incur, issue, assume or guarantee anynotes, bonds, debentures or other similar evidences of indebtedness for money borrowed (“Debt”), secured by pledge of, or mortgage or lien on, any PrincipalProperty (as defined below) of Westlake or any Restricted Subsidiary, or any shares of stock of or Debt of any Restricted Subsidiary (such pledges, mortgages andliens being called “Mortgage” or “Mortgages” and such Debt secured by such Mortgages being called “Secured Debt”), without effectively providing that thenotes (together with, if we shall so determine, any other indebtedness of Westlake or such Restricted Subsidiary then existing or thereafter created which is notsubordinate to the notes) shall be secured equally and ratably with (or prior to) such Secured Debt, so long as such Secured Debt shall be so secured, unless aftergiving effect thereto, the aggregate amount of all such Secured Debt plus all Attributable Debt of Westlake and its Restricted Subsidiaries in respect of any Saleand Leaseback Transaction (as defined below) would not, at the time of such incurrence, issuance, assumption or guarantee, exceed 15% of Consolidated NetTangible Assets; provided, however, that this restriction shall not apply to, and there shall be excluded from Secured Debt in any computation under suchrestriction, indebtedness secured by:•Mortgages on such property or shares of stock or Debt existing on the first date the notes were originallyissued;•Mortgages on such property or shares of stock of or Debt of any Person, which Mortgages are existing at the time (1) such Person became aRestricted Subsidiary, (2) such Person is merged into or consolidated with Westlake or any of its Subsidiaries or (3) Westlake or one of itsSubsidiaries merges into or consolidates with such Person (in a transaction in which such Person becomes a Restricted Subsidiary), which Mortgagewas not incurred in anticipation of such transaction and was outstanding prior to such transaction;•Mortgages in favor ofWestlake;•Mortgages in favor of a governmental entity or in favor of the holders of securities issued by any such entity, pursuant to any contract or statute(including Mortgages to secure debt of the pollution control or industrial revenue bond type) or to secure any indebtedness incurred for the purpose offinancing all or any part of the purchase price or the cost of construction of the property subject to such Mortgages;•Mortgages in favor of any governmental entity to secure progress, advance or other payments pursuant to any contract or provision of anystatute;•Mortgages on such property or shares of stock or Debt existing at the time of acquisition thereof (including acquisition through merger orconsolidation);•Mortgages on such property or shares of stock or Debt to secure the payment of all or any part of the purchase price or construction cost thereof or tosecure any Debt incurred prior to, at the time of, or within 180 days after, the acquisition of such property or shares or Debt, the completion of anyconstruction or the commencement of full operation, for the purpose of financing all or any part of the purchase price or construction cost thereof;•Mortgages incurred in connection with a Sale and Leaseback Transaction satisfying the provisions described under “—Limitations on Sale andLeaseback Transactions” below; and•any extension, renewal or replacement (or successive extensions, renewals or replacements), as a whole or in part, of any Mortgage referred to in theforegoing bullet points; provided that such extension, renewal or replacement Mortgage shall be limited to all or a part of the same such property orshares of stock or Debt that secured the Mortgage extended, renewed or replaced (plus improvements on such property).Limitations on Sale and Leaseback TransactionsUnder the indenture, Westlake will not, and will not permit any Restricted Subsidiary to, enter into any arrangement with any bank, insurance company orother lender or investor (not including us or any Restricted Subsidiary) or to which any such lender or investor is a party, providing for the leasing by us or aRestricted Subsidiary for a period, including renewals, in excess of three years of any Principal Property the ownership of which has been or is to be sold ortransferred, more than 180 days after the completion of construction and commencement of full operation thereof, by us or such Restricted Subsidiary to suchlender or investor or to any Person to whom funds have been or are to be advanced by such lender or investor on the security of such Principal Property (referred toas a “Sale and Leaseback Transaction”) unless:•such Sale and Leaseback Transaction is with a governmental entity that provides financial or taxbenefits;•we or such Restricted Subsidiary could create Secured Debt pursuant to the provisions described under “—Restrictions on Secured Debt” on thePrincipal Property to be leased in an amount equal to the Attributable Debt with respect to such Sale and Leaseback Transaction without equally andratably securing notes issued under the indenture; or•the net proceeds of the sale or transfer of the Principal Property leased pursuant to such Sale and Leaseback Transaction is at least equal to the fairmarket value of such Principal Property and (b) within 180 days after such sale or transfer shall have been made by us or by a Restricted Subsidiary,we apply an amount not less than the greater of (1) the net proceeds of the sale of the Principal Property leased pursuant to such arrangement or (2)the fair market value of the Principal Property so leased at the time of entering into such arrangement (as evidenced by an officers’ certificatedelivered to the trustee) to the retirement of Funded Debt (as defined below) of Westlake; provided that the amount to be applied to the retirement ofFunded Debt of Westlake shall be reduced by (x) the principal amount of notes issued under the indenture delivered within 180 days after such saleto the trustee for retirement and cancellation, and (y) the principal amount of Funded Debt other than notes issued under the indenture, voluntarilyretired by us within 180 days after such sale. No retirement referred to in this bullet point may be effected by payment at maturity or pursuant to anymandatory sinking fund payment or mandatory prepayment provision.Limitations on Consolidations, Mergers and Sales of AssetsThe indenture will provide that we may not consolidate with or merge into any entity or sell, lease, convey, assign, transfer or dispose of all orsubstantially all of our assets to any entity unless:•the resulting, surviving or transferee Person is either Westlake or is a corporation organized under the laws of the United States, any state thereof, orthe District of Columbia, and, if not Westlake, the resulting entity assumes by a supplemental indenture the due and punctual payments on the notesand the performance of our covenants and obligations under the indenture; and•immediately after giving effect to the transaction, no default or event of default under the indenture has occurred and is continuing or would resultfrom the transaction.Upon any transaction of the type described above, the resulting entity will succeed to and be substituted for and may exercise all of our rights and powersunder the indenture and the notes with the same effect as if the resulting entity had been named as us in the indenture. In the case of any asset transfer ordisposition other than a lease, when the resulting entity assumes all of our obligations and covenants under the indenture and the notes, we will be relieved of allsuch obligations.Certain Definitions“Attributable Debt” means, as to any lease in respect of a Sale and Leaseback Transaction under which any Person is at the time liable, at any date as ofwhich the amount thereof is to be determined, the total net amount of rent required to be paid by such Person under such lease during the remaining term thereof(or, if earlier, the first date upon which such lease may be terminated without penalty), discounted from the respective due dates thereof to such date at theweighted average rate per annum borne by the notes, compounded annually. The net amount of rent required to be paid under any such lease for any such periodshall be the aggregate amount of the rent payable by the lessee with respect to such period after excluding amounts required to be paid on account of maintenanceand repairs, insurance, taxes, assessments, water rates and similar charges. Unless we elect to calculate the total amount of rent required to be paid through the firstdate upon which such lease may be terminated without penalty (if such a provision exists), in the case of any lease which is terminable by the lessee upon thepayment of a penalty, such net amount shall also include the amount of such penalty, but no rent shall be considered as required to be paid under such leasesubsequent to the first date upon which it may be so terminated.“Consolidated Net Tangible Assets” means the aggregate amount of assets (less applicable reserves and other properly deductible items) after deductingtherefrom (1) all current liabilities, except for (a) notes and loans payable, (b) current maturities of long-term debt and (c) current maturities of obligations underfinance leases and (2) all goodwill, trade names, trademarks, patents, unamortized debt discount and expense and other like intangibles, all as set forth on the mostrecent balance sheet of Westlake and its consolidated Subsidiaries and computed in accordance with generally accepted accounting principles in the United Statesas in effect from time to time. Deferred income taxes, deferred investment tax credit or other similar items, as calculated in accordance with generally acceptedaccounting principles in the United States as in effect from time to time, will not be considered as a liability or as a deduction from or adjustment to total assets.“Euro” or “€” means the official currency of the European Union member states participating in the European Monetary Union.“Funded Debt” means all indebtedness for money borrowed having a maturity of more than 12 months from the date of the most recent balance sheet ofWestlake and its consolidated Subsidiaries or having a maturity of less than 12 months but by its terms being renewable or extendible beyond 12 months from thedate of such balance sheet at the option of the borrower of such indebtedness.“Principal Property” means any single parcel of real estate, any single manufacturing plant or any single warehouse owned or leased in connection with aSale and Leaseback Transaction by Westlake or any Subsidiary which is located within the United States and the net book value of which on the date as of whichthe determination is being made exceeds 1% of Consolidated Net Tangible Assets, other than any such manufacturing plant or warehouse or portion thereof (1)which is a pollution control or other facility financed by obligations issued by a state or local government unit and described in Sections 141(a), 142(a)(5), 142(a)(6), 142(a)(10) or 144(a) of the Internal Revenue Code (or their successor provisions) or by any other obligations the interest of which is excluded under Section103 of the Internal Revenue Code (or its successor provision), or (2) which, in the good-faith opinion of our board of directors, as evidenced by a board resolution,is not of material importance to the total business conducted by Westlake and its Subsidiaries taken as a whole.“Restricted Subsidiary” means a wholly-owned Subsidiary of Westlake substantially all of the assets of which are located in the United States (excludingterritories or possessions) and which owns a Principal Property; provided, however, that the term Restricted Subsidiary shall not include any Subsidiary that isprincipally engaged in (1) the business of financing; (2) the business of owning, buying, selling, leasing, dealing in or developing real property; or (3) the businessof exporting goods or merchandise from or importing goods or merchandise into the United States.“Subsidiary” means a Person more than 50% of the outstanding Voting Stock (as defined above) of which is owned, directly or indirectly, by Westlake orby one or more other Subsidiaries, or by Westlake and one or more other Subsidiaries.Events of DefaultThe following are events of default with respect to the notes:•our failure to pay interest on the notes for 30 days after becomingdue;•our failure to pay principal of or any premium on the notes whendue;•our failure to comply with any covenant or agreement of the notes or the indenture (other than an agreement or covenant that has been included in theindenture solely for the benefit of another series of notes) for 60 days after written notice by the trustee or by the holders of at least 25% in principalamount of the outstanding notes issued under the indenture that are affected by that failure; and•specified events involving bankruptcy, insolvency or reorganization ofWestlake.A default under one series of notes will not necessarily be a default under any other series. If a default or event of default for the notes occurs, iscontinuing and is known to the trustee, the trustee will notify the holders of the notes within 90 days after it occurs. The trustee may withhold notice to the holdersof the notes of any default or event of default, except in any payment on the notes, if the trustee in good faith determines that withholding notice is in the interestsof the holders of those notes.If an event of default for the notes occurs and is continuing, the trustee or the holders of at least 25% in principal amount of the outstanding notes (or, insome cases, 25% in principal amount of all notes issued under the indenture that are affected, voting as one class) may declare the principal of and all accrued andunpaid interest on those notes to be due and payable immediately. If an event of default relating to certain events of bankruptcy, insolvency or reorganization ofWestlake occurs, the principal of and accrued and unpaid interest on the notes will become immediately due and payable without any action on the part of thetrustee or any holder. At any time after a declaration of acceleration has been made, the holders of a majority in principal amount of the outstanding notes (or, insome cases, of all notes issued under the indenture that are affected, voting as one class) may in some cases rescind this accelerated payment requirement and itsconsequences.A holder of notes may pursue any remedy under the indenture only if:•the holder gives the trustee written notice of a continuing event of default with respect to thenotes;•the holders of at least 25% in principal amount of the outstanding notes make a written request to the trustee to pursue theremedy;•the holders offer to the trustee indemnity satisfactory to the trustee against any loss, liability orexpense;•the trustee does not comply with the request within 60 days after receipt of the request and offer of indemnity;and•during that 60-day period, the holders of a majority in principal amount of the notes do not give the trustee a direction inconsistent with therequest.This provision does not, however, affect the right of a holder of notes to sue for enforcement of any overdue payment.The trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request or direction of any of the holders unlessthose holders have offered to the trustee indemnity satisfactory to it. Subject to this provision for indemnification, the holders of a majority in principal amount ofthe outstanding notes (or a majority in principal amount of all notes issued under the indenture that are affected, voting as one class) generally may direct the time,method and place of:•conducting any proceeding for any remedy available to the trustee; or•exercising any trust or power conferred on the trustee relating to or arising as a result of an event ofdefault.If an event of default occurs and is continuing, the trustee will be required to use the degree of care and skill of a prudent person in the conduct of his ownaffairs.The indenture requires us to furnish to the trustee annually a statement as to our performance of certain of our obligations under the indenture and as toany default in performance.Modification and WaiverWe and the trustee may supplement or amend the indenture with the consent of the holders of at least a majority in principal amount of the outstandingnotes of all series issued under the indenture that are affected by the amendment or supplement (voting as one class). Without the consent of the holder of each noteaffected, however, no modification may:•reduce the amount of notes whose holders must consent to an amendment, supplement orwaiver;•reduce the rate of or change the time for payment of interest on thenotes;•reduce the principal of the notes or change their statedmaturity;•reduce any premium payable on the redemption of the notes or change the time at which the notes may or must beredeemed;•change any obligation to pay additional amounts on the notes;•make payments on the notes payable in currency other than as originally stated in thenotes;•impair the holder’s right to institute suit for the enforcement of any payment on or with respect to the notes;•make any change in the percentage of principal amount of notes necessary to waive compliance with certain provisions of the indenture or to makeany change in the provision related to modification; and•waive a continuing default or event of default regarding any payment on the notes.We and the trustee may supplement or amend the indenture or waive any provision of the indenture without the consent of any holders of notes issuedunder the indenture in certain circumstances, including:•to cure any ambiguity, omission, defect orinconsistency;•to conform the provisions of the indenture (as amended or supplemented) or the notes to the “Description of the Senior Notes” section of theapplicable prospectus supplement;•to provide for the assumption of our obligations under the indenture by a successor upon any merger, consolidation or asset transfer permitted underthe indenture;•to provide for uncertificated notes in addition to or in place of certificated notes or to provide for bearernotes;•to provide any security for, or to add any guarantees of or obligors on, any series ofnotes;•to comply with any requirement to effect or maintain the qualification of the indenture under the Trust Indenture Act of1939;•to add covenants that would benefit the holders of any notes or to surrender any rights we have under theindenture;•to add events of default with respect to any series of notes;•to make any change that does not adversely affect any outstanding notes of any series issued under the indenture in any material respect;and•to establish the form or terms of any notes and to accept the appointment of a successor trustee, each as permitted under theindenture.The holders of a majority in principal amount of the outstanding notes (or, in some cases, a majority in principal amount of all notes issued under theindenture that are affected, voting as one class) may waive any existing or past default or event of default with respect to the notes. Those holders may not,however, waive any default or event of default in any payment on any note or compliance with a provision that cannot be amended or supplemented without theconsent of each holder affected.Defeasance and DischargeDefeasance. When we use the term defeasance, we mean discharge from some or all of our obligations under the indenture. If we deposit with the trusteeunder the indenture any combination of money or government securities sufficient to make payments on the notes on the dates those payments are due, then, at ouroption, either of the following will occur:•we will be discharged from our obligations with respect to the notes (“legal defeasance”);or•we will no longer have any obligation to comply with specified restrictive covenants with respect to the notes, the covenant described under“—Certain Covenants—Limitations on Consolidations, Mergers and Sales of Assets” above and other specified covenants under the indenture, andthe related events of default will no longer apply (“covenant defeasance”).If the notes are defeased, the holders of the notes will not be entitled to the benefits of the indenture, except for obligations to register the transfer orexchange of notes, replace stolen, lost or mutilated notes or maintain paying agencies and hold money for payment in trust. In the case of covenant defeasance, ourobligation to pay principal, premium and interest on the notes will also survive.We will be required to deliver to the trustee an opinion of counsel that the deposit and related defeasance would not cause the beneficial owners of thenotes to recognize income, gain or loss for U.S. federal income tax purposes and that the beneficial owners would be subject to U.S. federal income tax on the sameamounts, in the same manner and at the same times as would have been the case if the deposit and related defeasance had not occurred. If we elect legaldefeasance, that opinion of counsel must be based upon a ruling from the United States Internal Revenue Service or a change in law to that effect.Satisfaction and Discharge. In addition, the indenture will cease to be of further effect with respect to the notes, subject to exceptions relating tocompensation and indemnity of the trustee under the indenture and repayment to us of excess money or government securities, when:•eitheroall outstanding notes have been delivered to the trustee for cancellation;oroall outstanding notes not delivered to the trustee for cancellationeither:§have become due andpayable§will become due and payable at their stated maturity within one year,or§are to be called for redemption within one year;and§we have deposited with the trustee any combination of money or government securities in trust sufficient to pay the entire indebtednesson the notes when due; and§we have paid all other sums payable by us with respect to thenotes.Governing LawNew York law governs the indenture and the notes.The TrusteeThe Bank of New York Mellon Trust Company, N.A. (successor to JPMorgan Chase Bank, National Association) acts as the trustee under the indenture.The Bank of New York Mellon Trust Company, N.A. acts as the trustee with respect to the notes.The indenture contains limitations on the right of the trustee, if it or any of its affiliates is then our creditor to obtain payment of claims or to realize oncertain property received for any such claim, as security or otherwise. The trustee and its affiliates are permitted to engage in other transactions with us. If,however, the trustee acquires any conflicting interest, it must eliminate that conflict or resign within 90 days after ascertaining that it has a conflicting interest andafter the occurrence of a default under the indenture, unless the default has been cured, waived or otherwise eliminated within the 90-day period.Payments and Paying AgentsWe will make payments on the notes in Euros and such payments on notes represented by a global security will be made through one or more payingagents to the Clearing Systems or their nominee.We will make interest payments to the person in whose name the note is registered at the close of business on the record date for the interest payment. Theregular record dates for the notes will be the close of business (in the relevant Clearing System) on the Clearing System Business Day immediately preceding eachinterest payment date (or, if the notes are held in definitive form, the 15th calendar day preceding each interest payment date, whether or not a business day).The Bank of New York Mellon, London Branch is designated as the paying agent for payments on notes issued under the indenture pursuant to a payingagency agreement entered into on July 17, 2019. We may at any time designate additional paying agents or rescind the designation of any paying agent or approvea change in the office through which any paying agent acts.If the principal of or any premium or interest on the notes is payable on a day that is not a Clearing System Business Day, the payment will be made onthe following Clearing System Business Day. For these purposes, a “Clearing System Business Day” means a day on which each Clearing System for which anyglobal security is being held is open for business.Subject to the requirements of any applicable abandoned property laws, the trustee and paying agent will pay to us upon written request any money heldby them for payments on the notes that remains unclaimed for two years after the date upon which that payment has become due. After payment to us, holders ofnotes entitled to the money must look to us for payment. In that case, all liability of the trustee or paying agent with respect to that money will cease.Book-Entry, Clearance and SettlementThe description of the Clearing Systems in this section reflects our understanding of the rules and procedures of Clearstream Luxembourg and Euroclearas they are currently in effect. These systems could change their rules and procedures at any time. We have obtained the information in this section concerningClearstream Luxembourg and Euroclear and their book-entry systems and procedures from sources that we believe to be reliable, but we take no responsibility forthe accuracy of this information.The notes will initially be represented by one or more fully registered global securities. Each such global security will be deposited with, or on behalf of,a common depositary, and registered in the name of the nominee of the common depositary for the accounts of Clearstream Luxembourg and Euroclear. Except asdescribed below, the global securities may be transferred, in whole and not in part, only to Euroclear or Clearstream Luxembourg or their respective nominees.You may hold your interests in the global securities in Europe through Clearstream Luxembourg or Euroclear, either as a participant in such systems or indirectlythrough organizations which are participants in such systems. Clearstream Luxembourg and Euroclear will hold interests in the global securities on behalf of theirrespective participating organizations or customers through customers’ securities accounts in Clearstream Luxembourg’s or Euroclear’s names on the books oftheir respective depositaries. Book-entry interests in the notes and all transfers relating to the securities will be reflected in the book-entry records of ClearstreamLuxembourg and Euroclear.Any secondary market trading of book-entry interests in the notes will take place through Clearstream Luxembourg and Euroclear participants and willsettle in same-day funds. Owners of book-entry interests in the notes will receive payments relating to their notes in Euros.Clearstream Luxembourg and Euroclear have established electronic securities and payment transfer, processing, depositary and custodial links amongthemselves and others, either directly or through custodians and depositaries. These links allow the notes to be issued, held and transferred among the ClearingSystems without the physical transfer of certificates. Special procedures to facilitate clearance and settlement have been established among the Clearing Systems totrade securities across borders in the secondary market.The policies of Clearstream Luxembourg and Euroclear will govern payments, transfers, exchanges and other matters relating to your interest in the notes.We, the trustee and the paying agent have no responsibility for any aspect of the records kept by Clearstream Luxembourg or Euroclear or any of their direct orindirect participants. We, the trustee and the paying agent also do not supervise these systems in any way.Clearstream Luxembourg and Euroclear and their participants perform these clearance and settlement functions under agreements they have made withone another or with their customers. You should be aware that they are not obligated to perform or continue to perform these procedures and may modify them ordiscontinue them at any time.Except as provided below, owners of beneficial interests in the notes will not be entitled to have the notes registered in their names, will not receive or beentitled to receive physical delivery of the notes in definitive form and will not be considered the owners or holders of the notes under the indenture. Accordingly,each person owning a beneficial interest in a global security must rely on the procedures of the Clearing Systems and, if such person is not a participant, on theprocedures of the participant through which such person owns its interest, in order to exercise any rights of a noteholder.Clearstream LuxembourgClearstream Luxembourg has advised us that it is incorporated under the laws of Luxembourg as a professional depositary. Clearstream Luxembourgholds securities for its participating organizations (“Clearstream Participants”) and facilitates the clearance and settlement of securities transactions betweenClearstream Participants through electronic book-entry changes in accounts of Clearstream Participants, thereby eliminating the need for physical movement ofcertificates. Clearstream Luxembourg provides to Clearstream Participants, among other things, services for safekeeping, administration, clearance and settlementof internationally traded securities and securities lending and borrowing. Clearstream Luxembourg interfaces with domestic markets in several countries.As a professional depositary, Clearstream Luxembourg is subject to regulation by the Luxembourg Commission for the Supervision of the FinancialSector (Commission de Surveillance du Secteur Financier). Clearstream Participants are recognized financial institutions around the world, including underwriters,securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations and may include the underwriters. Indirect access toClearstream Luxembourg is also available to others, such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship witha Clearstream Participant, either directly or indirectly.Distributions with respect to interests in the notes held beneficially through Clearstream Luxembourg will be credited to cash accounts of ClearstreamParticipants in accordance with its rules and procedures.EuroclearEuroclear has advised us that it was created in 1968 to hold securities for participants of Euroclear (“Euroclear Participants”) and to clear and settletransactions between Euroclear Participants through simultaneous electronic book-entry delivery against payment, thereby eliminating the need for physicalmovement of certificates and any risk from lack of simultaneous transfers of securities and cash. Euroclear includes various other services, including securitieslending and borrowing and interfaces with domestic markets in several countries. Euroclear is operated by Euroclear Bank SA/NV (the “Euroclear Operator”). Alloperations are conducted by the Euroclear Operator, and all Euroclear securities clearance accounts and Euroclear cash accounts are accounts with the EuroclearOperator. Euroclear Participants include banks (including central banks), securities brokers and dealers and other professional financial intermediaries and mayinclude the underwriters. Indirect access to Euroclear is also available to other firms that clear through or maintain a custodial relationship with a EuroclearParticipant, either directly or indirectly.The Terms and Conditions Governing Use of Euroclear and the related Operating Procedures of the Euroclear System, or the Euroclear Terms andConditions, and applicable Belgian law govern securities clearance accounts and cash accounts with the Euroclear Operator. Specifically, these terms andconditions govern:•transfers of securities and cash within Euroclear;•withdrawal of securities and cash from Euroclear;and•receipt of payments with respect to securities in Euroclear.All securities in Euroclear are held on a fungible basis without attribution of specific certificates to specific securities clearance accounts. The EuroclearOperator acts under the terms and conditions only on behalf of Euroclear Participants and has no record of or relationship with persons holding securities throughEuroclear Participants.Distributions with respect to interests in the notes held beneficially through Euroclear will be credited to the cash accounts of Euroclear Participants inaccordance with the Euroclear Terms and Conditions.Clearance and Settlement ProceduresInvestors that hold their securities through Clearstream Luxembourg or Euroclear accounts will follow the settlement procedures that are applicable toconventional eurobonds in registered form. Notes will be credited to the securities custody accounts of Clearstream Luxembourg and Euroclear participants on thebusiness day following the issue date, for value on the issue date. They will be credited either free of payment or against payment for value on the issue date.Secondary market trading between Clearstream Luxembourg and/or Euroclear participants will occur in the ordinary way following the applicable rulesand operating procedures of Clearstream Luxembourg and Euroclear. Secondary market trading will be settled using procedures applicable to conventionaleurobonds in registered form.You should be aware that investors will only be able to make and receive deliveries, payments and other communications involving the notes throughClearstream Luxembourg and Euroclear on days when those systems are open for business. Those systems may not be open for business on days when banks,brokers and other institutions are open for business in the United States.In addition, because of time-zone differences, there may be problems with completing transactions involving Clearstream Luxembourg and Euroclear onthe same business day as in the United States. U.S. investors who wish to transfer their interests in the notes, or to make or receive a payment or delivery of thenotes, on a particular day, may find that the transactions will not be performed until the next business day in Luxembourg or Brussels, depending on whetherClearstream Luxembourg or Euroclear is used.Clearstream Luxembourg or Euroclear will credit payments to the cash accounts of Clearstream Luxembourg customers or Euroclear participants, asapplicable, in accordance with the relevant system’s rules and procedures, to the extent received by its depositary. Clearstream Luxembourg or the EuroclearOperator, as the case may be, will take any other action permitted to be taken by a holder under the indenture on behalf of a Clearstream Luxembourg customer orEuroclear participant only in accordance with its relevant rules and procedures.Clearstream Luxembourg and Euroclear have agreed to the foregoing procedures in order to facilitate transfers of securities among participants ofClearstream Luxembourg and Euroclear. However, they are under no obligation to perform or continue to perform those procedures, and they may discontinuethose procedures at any time.If the Clearing Systems are at any time unwilling or unable to continue as depositary and a successor depositary is not appointed by us within 90 days, wewill issue the notes in definitive form in exchange for the entire global note representing such notes. In addition, we may at any time, and in our sole discretion andsubject to the procedures of the Clearing Systems, determine not to have the notes represented by the global note and, in such event, will issue notes in definitiveform in exchange for the global note representing such notes. In any such instance, an owner of a beneficial interest in the global note will be entitled to physicaldelivery in definitive form of notes represented by such global note equal in principal amount to such beneficial interest and to have such notes registered in itsname.1EXHIBIT 21SUBSIDIARIES OF WESTLAKE * Name of Subsidiary State or Other Jurisdictionof Incorporation orOrganization Names Doing Business Axiall Canada, Inc. Canada Axiall Canada, Inc. Axiall Corporation Delaware Axiall Corporation Axiall Holdco, Inc. Delaware Axiall Holdco, Inc. Axiall Limited Partnership Ontario Axiall Limited Partnership Axiall Noteco, Inc. Delaware Axiall Noteco, Inc. Axiall Taiwan Ltd. Taiwan Axiall Taiwan Ltd. Axiall, LLC Delaware Axiall, LLC Eagle Natrium LLC Delaware Eagle Natrium LLC Eagle Spinco Inc. Delaware Eagle Spinco Inc. Eagle US 2 LLC Delaware Eagle US 2 LLC Lagoon LLC Delaware Lagoon LLC North American Pipe Corporation Delaware North American Pipe Corporation and NAPCO North American Specialty Products LLC Delaware North American Specialty Products LLC Plastic Trends, Inc. Michigan Plastic Trends, Inc. Rome Acquisition Holding Corp. Nova Scotia Rome Acquisition Holding Corp. Rome Delaware Corp. Delaware Rome Delaware Corp. Royal Building Products (USA) Inc. Delaware Royal Building Products (USA) Inc. Royal Group, Inc. Canada Royal Group, Inc. Taiwan Chlorine Industries Ltd. Taiwan Taiwan Chlorine Industries Ltd. Vinnolit Benelux-France B.V.B.A. Dendermonde, Belgium Vinnolit Benelux-France B.V.B.A. Vinnolit GmbH & Co. KG Ismaning, Germany Vinnolit GmbH & Co. KG Vinnolit Holdings GmbH Ismaning, Germany Vinnolit Holdings GmbH Vinnolit Italia S.r.L. Milan, Italy Vinnolit Italia S.r.L. Vinnolit Limited United Kingdom Vinnolit Limited Vinnolit Monomer Geschäftsführungs GmbH Ismaning, Germany Vinnolit Monomer Geschäftsführungs GmbH Vinnolit Schkopau GmbH Ismaning, Germany Vinnolit Schkopau GmbH Vinnolit Treuhand GmbH Ismaning, Germany Vinnolit Treuhand GmbH Westlake Chemical Finance Corporation Delaware Westlake Chemical Finance Corporation Westlake Chemical Investments, Inc. Delaware Westlake Chemical Investments, Inc. Westlake Chemical OpCo LP Delaware Westlake Chemical OpCo LP Westlake Chemical Partners GP LLC Delaware Westlake Chemical Partners GP LLC Westlake Chemical Partners LP Delaware Westlake Chemical Partners LP Westlake Compounds LLC Delaware Westlake Compounds LLC Westlake Development Corporation Delaware Westlake Development Corporation Westlake International Holdings Cooperatief U.A. The Netherlands Westlake International Holdings Cooperatief U.A. Westlake International Holdings II C.V. The Netherlands Westlake International Holdings II C.V. Westlake International I B.V. The Netherlands Westlake International I B.V. Westlake Longview Corporation Delaware Westlake Longview Corporation Westlake Management Services, Inc. Delaware Westlake Management Services, Inc. Westlake Olefins LLC Delaware Westlake Olefins LLC Westlake Petrochemicals LLC Delaware Westlake Petrochemicals LLC, Westlake Petrochemicals LP and WPE Westlake Polymers LLC Delaware Westlake Polymers LLC, Westlake Polymers LP and WPE Westlake Styrene LLC Delaware Westlake Styrene LLC Westlake Switzerland GmbH Switzerland Westlake Switzerland GmbH Westlake Vinyls Company LP Delaware Westlake Vinyls Company LP Westlake Vinyl Corporation Delaware Westlake Vinyl Corporation Westlake Vinyls, Inc. Delaware Westlake Vinyls, Inc. WPT LLC Delaware WPT LLC and WPT LP ______________________________*Westlake has elected to omit the names of certain subsidiaries. None of the omitted subsidiaries, considered either alone or together with the other omittedsubsidiaries of its immediate parent, constitutes a “Significant Subsidiary” as set forth in Section 601(b)(21) of Regulation S-K.EXHIBIT 23.1CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMWe hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-234573) and Form S‑8 (No. 333-118205) of WestlakeChemical Corporation of our report dated February 19, 2020 relating to the financial statements and the effectiveness of internal control over financial reporting,which appears in this Form 10‑K. /s/ PricewaterhouseCoopers LLPHouston, TexasFebruary 19, 2020EXHIBIT 31.1CERTIFICATIONSI, Albert Chao, certify that:1.I have reviewed this annual report on Form 10-K of Westlake ChemicalCorporation;2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in ExchangeAct Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for theregistrant and have:a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensurethat material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision,to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes inaccordance with generally accepted accounting principles;c)evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; andd)disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscalquarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect,the registrant's internal control over financial reporting; and5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to theregistrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likelyto adversely affect the registrant's ability to record, process, summarize and report financial information; andb)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control overfinancial reporting.Date:February 19, 2020 /s/ ALBERT CHAO Albert ChaoPresident and Chief Executive Officer(Principal Executive Officer)EXHIBIT 31.2CERTIFICATIONSI, M. Steven Bender, certify that:1.I have reviewed this annual report on Form 10-K of Westlake ChemicalCorporation;2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in ExchangeAct Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for theregistrant and have:a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensurethat material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision,to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes inaccordance with generally accepted accounting principles;c)evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; andd)disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscalquarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect,the registrant's internal control over financial reporting; and5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to theregistrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likelyto adversely affect the registrant's ability to record, process, summarize and report financial information; andb)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control overfinancial reporting.Date:February 19, 2020 /s/ M. STEVEN BENDER M. Steven BenderExecutive Vice President and Chief Financial Officer(Principal Financial Officer)EXHIBIT 32.1CERTIFICATION PURSUANT TO18 U.S.C. SECTION 1350AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002In connection with the Annual Report of Westlake Chemical Corporation (the "Company") on Form 10-K for the fiscal year ended December 31, 2019 asfiled with the Securities and Exchange Commission on the date hereof (the "Report"), I, Albert Chao, President and Chief Executive Officer of the Company, and I,M. Steven Bender, Executive Vice President and Chief Financial Officer of the Company, certify, to the best of our knowledge, pursuant to 18 U.S.C. §1350, asadopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934;and(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of theCompany.Date:February 19, 2020 /s/ ALBERT CHAO Albert ChaoPresident and Chief Executive Officer(Principal Executive Officer) Date:February 19, 2020 /s/ M. STEVEN BENDER M. Steven BenderExecutive Vice President and Chief Financial Officer(Principal Financial Officer)

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