10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended September 30, 2016

or

¨	TRANSITION 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 of incorporation or organization)	(I.R.S. Employer Identification Number)

2801 Post Oak Boulevard, Suite 600

Houston, Texas 77056

(Address of principal executive offices, including zip code)

(713) 960-9111

(Registrant's telephone number, including area code)

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 1934 during 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 requirements for the past 90 days.     YesxNo¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     YesxNo¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a smaller reporting company. See definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)     Yes¨Nox

The number of shares outstanding of the registrant's sole class of common stock as of November 2, 2016 was 128,903,141.

INDEX

Item	Page
PART I. FINANCIAL INFORMATION
1) Financial Statements	1
2) Management's Discussion and Analysis of Financial Condition and Results of Operations	40
3) Quantitative and Qualitative Disclosures about Market Risk	53
4) Controls and Procedures	54
PART II. OTHER INFORMATION
1) Legal Proceedings	55
1A) Risk Factors	55
2) Unregistered Sales of Equity Securities and Use of Proceeds	57
6) Exhibits	58

NON-GAAP FINANCIAL MEASURES

The body of accounting principles generally accepted in the United States is commonly referred to as "U.S. GAAP." For this purpose, a non-GAAP financial measure is generally defined by the Securities and Exchange Commission ("SEC") as one that purports to measure historical or future financial performance, financial position or cash flows, but excludes or includes amounts that would not be so adjusted in the most comparable GAAP measures. In this report, we disclose so-called non-GAAP financial measures, primarily earnings before interest, taxes, depreciation and amortization ("EBITDA"). EBITDA is calculated as net income before interest expense, income taxes, depreciation and amortization. The non-GAAP financial measures described in this Form 10-Q are not substitutes for the GAAP measures of earnings and cash flow.

EBITDA is included in this Form 10-Q because our management considers it an important supplemental measure of our performance 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 that have 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 capital requirements, and EBITDA is commonly used by us and our investors to measure our ability to service indebtedness. EBITDA is not a substitute for the GAAP measures of earnings or of cash flow and is not necessarily a measure of our ability to fund our cash needs. In addition, it should be noted that companies calculate EBITDA differently and, therefore, EBITDA as presented for us may not be comparable 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.

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	September 30, 2016			December 31, 2015
	(in thousands of dollars, except par values and share amounts)
ASSETS
Current assets
Cash and cash equivalents	$	380,519		$	662,525
Marketable securities	—			520,144
Accounts receivable, net	1,070,501			508,532
Inventories	744,536			434,060
Prepaid expenses and other current assets	54,868			14,489
Restricted cash	169,320			—
Deferred income taxes	—			35,439
Total current assets	2,419,744			2,175,189
Property, plant and equipment, net	6,450,947			3,004,067
Other assets, net
Goodwill	925,700			62,016
Customer relationships	604,551			52,677
Other intangible assets, net	185,651			98,711
Deferred charges and other assets, net	310,456			176,625
Total other assets, net	2,026,358			390,029
Total assets	$	10,897,049		$	5,569,285
LIABILITIES AND EQUITY
Current liabilities
Accounts and notes payable	$	503,388		$	235,329
Accrued liabilities	552,581			287,313
Term loan	148,681			—
Total current liabilities	1,204,650			522,642
Long-term debt, net	3,680,585			758,148
Deferred income taxes	1,607,084			575,603
Pension and other post-retirement benefits	434,067			122,821
Other liabilities	146,526			28,140
Total liabilities	7,072,912			2,007,354
Commitments and contingencies (Notes 10 and 20)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized;    no shares issued and outstanding	—			—
Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and 134,663,244 shares issued at September 30, 2016 and December 31, 2015, respectively	1,347			1,347
Common stock, held in treasury, at cost; 5,752,377 and 4,444,898 shares at September 30, 2016 and December 31, 2015, respectively	(319,980		)	(258,312		)
Additional paid-in capital	546,519			542,148
Retained earnings	3,337,968			3,109,987
Accumulated other comprehensive loss	(108,126		)	(129,292		)
Total Westlake Chemical Corporation stockholders' equity	3,457,728			3,265,878
Noncontrolling interests	366,409			296,053
Total equity	3,824,137			3,561,931
Total liabilities and equity	$	10,897,049		$	5,569,285

The accompanying notes are an integral part of these consolidated financial statements.

1

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(in thousands of dollars, except per share data and share amounts)
Net sales	$	1,279,028		$	1,188,037		$	3,340,276		$	3,476,570
Cost of sales	1,076,895			876,761			2,641,192			2,527,567
Gross profit	202,133			311,276			699,084			949,003
Selling, general and administrative expenses	72,729			57,248			179,757			170,321
Transaction and integration-related costs	82,841			—			90,550			—
Income from operations	46,563			254,028			428,777			778,682
Other income (expense)
Interest expense	(24,366		)	(8,211		)	(36,966		)	(26,760		)
Other income, net	41,265			2,636			52,091			33,790
Income before income taxes	63,462			248,453			443,902			785,712
(Benefit from) provision for income taxes	(6,552		)	60,033			129,332			236,824
Net income	70,014			188,420			314,570			548,888
Net income attributable to noncontrolling interests	4,352			4,816			14,656			13,847
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	0.51		$	1.39		$	2.31		$	4.04
Diluted	$	0.51		$	1.39		$	2.29		$	4.02
Weighted average common shares outstanding:
Basic	128,793,661			131,664,296			129,519,577			132,301,814
Diluted	129,379,956			132,121,235			130,103,897			132,786,534
Dividends per common share	$	0.1906		$	0.1815		$	0.5536		$	0.5115

The accompanying notes are an integral part of these consolidated financial statements.

2

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(in thousands of dollars)
Net income	$	70,014		$	188,420		$	314,570		$	548,888
Other comprehensive (loss) income, net of income taxes
Pension and other post-retirement benefits liability
Pension and other post-retirement reserves    adjustment (excluding amortization)	(206		)	(22		)	(412		)	(208		)
Amortization of benefits liability	369			692			1,072			2,019
Income tax provision on pension and other    post-retirement benefits liability	(60		)	(232		)	(251		)	(621		)
Foreign currency translation adjustments	6,453			(1,920		)	15,758			(43,746		)
Available-for-sale investments
Unrealized holding gains (losses) on    investments	1,550			(716		)	61,524			3,987
Reclassification of net realized gains    to net income	(52,401		)	—			(53,720		)	(3,795		)
Income tax benefit (provision) on    available-for-sale investments	18,270			257			(2,805		)	(68		)
Other comprehensive (loss) income	(26,025		)	(1,941		)	21,166			(42,432		)
Comprehensive income	43,989			186,479			335,736			506,456
Comprehensive income attributable to    noncontrolling interests, net of tax of $0    for each of the respective periods presented	4,352			4,816			14,656			13,847
Comprehensive income attributable to    Westlake Chemical Corporation	$	39,637		$	181,663		$	321,080		$	492,609

The accompanying notes are an integral part of these consolidated financial statements.

3

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine Months Ended September 30,
	2016			2015
	(in thousands of dollars)
Cash flows from operating activities
Net income	$	314,570		$	548,888
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	227,193			180,229
Provision for doubtful accounts	1,176			778
Amortization of debt issuance costs	1,018			1,504
Stock-based compensation expense	6,588			7,544
Loss from disposition of property, plant and equipment	6,541			2,590
Gains realized on previously held shares of Axiall common stock and from    sales of securities	(53,720		)	(3,795		)
Gain on acquisition, net of loss on the fair value remeasurement    of preexisting equity interest	—			(21,045		)
Impairment of equity method investment	—			4,925
Deferred income taxes	105,910			7,585
Windfall tax benefits from share-based payment arrangements	(1,190		)	(2,452		)
Income from equity method investments, net of dividends	(61		)	(1,016		)
Other losses, net	833			3,584
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	(92,311		)	54,937
Inventories	(6,124		)	105,899
Prepaid expenses and other current assets	1,631			(5,496		)
Accounts payable	34,109			(30,511		)
Accrued liabilities	73,157			(10,893		)
Other, net	(75,160		)	(1,955		)
Net cash provided by operating activities	544,160			841,300
Cash flows from investing activities
Acquisition of business, net of cash acquired	(2,437,829		)	15,782
Additions to cost method investment	(4,000		)	—
Additions to property, plant and equipment	(467,330		)	(329,236		)
Proceeds from disposition of assets	213			17
Proceeds from disposition of equity method investment	—			27,865
Proceeds from sales and maturities of securities	662,938			16,056
Purchase of securities	(138,422		)	(282,542		)
Settlements of derivative instruments	(4,655		)	(1,535		)
Net cash used for investing activities	(2,389,085		)	(553,593		)
Cash flows from financing activities
Debt issuance costs	(35,207		)	—
Dividends paid	(71,933		)	(67,852		)
Distributions to noncontrolling interests	(12,300		)	(10,982		)
Proceeds from debt issuance	1,428,512			—
Proceeds from exercise of stock options	1,650			984
Proceeds from issuance of notes payable	5,597			19,483
Proceeds from term loan and drawdown of revolver	600,000			—
Restricted cash associated with term loan	(154,000		)	—
Repayment of notes payable	(10,602		)	(32,954		)
Repayment of revolver	(125,000		)	—
Repurchase of common stock for treasury	(67,406		)	(114,254		)
Windfall tax benefits from share-based payment arrangements	1,190			2,452
Net cash provided by (used for) financing activities	1,560,501			(203,123		)
Effect of exchange rate changes on cash and cash equivalents	2,418			(3,260		)
Net (decrease) increase in cash and cash equivalents	(282,006		)	81,324
Cash and cash equivalents at beginning of period	662,525			880,601
Cash and cash equivalents at end of period	$	380,519		$	961,925

The accompanying notes are an integral part of these consolidated financial statements.

4

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

1. Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2015 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2015 (the "2015 Form 10-K"), filed with the SEC on February 24, 2016. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2015.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of September 30, 2016, its results of operations for the three and nine months ended September 30, 2016 and 2015 and the changes in its cash position for the nine months ended September 30, 2016 and 2015.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2016 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make 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.

Certain prior period amounts have been reclassified in the consolidated balance sheet and consolidated statements of operations to conform to current presentation.

Recent Accounting Pronouncements

Revenue from Contracts with Customers (ASU No. 2014-09)

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on a comprehensive new revenue recognition standard that will supersede the existing revenue recognition guidance. The new accounting guidance creates a framework by which an entity will allocate the transaction price to separate performance obligations and recognize revenue when each performance obligation is satisfied. Under the new standard, entities will be required to use judgment and make estimates, including identifying performance obligations in a contract, estimating the amount of variable consideration to include in the transaction price, allocating the transaction price to each separate performance obligation and determining when an entity satisfies its performance obligations. The standard allows for either "full retrospective" adoption, meaning that the standard is applied to all of the periods presented with a cumulative catch-up as of the earliest period presented, or "modified retrospective" adoption, meaning the standard is applied only to the most current period presented in the financial statements with a cumulative catch-up as of the current period. In 2016, the FASB issued various additional authoritative guidance for the new revenue recognition standard. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting standard will have on its consolidated financial position, results of operations and cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU No. 2016-01)

In January 2016, the FASB issued an accounting standards update making certain changes principally to the current guidance for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. Among other things, the guidance (1) requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value, with changes in fair value recognized in net income; (2) provide entities with a policy election to record equity investments without readily determinable fair values at cost, less impairment, and subsequent adjustments for observable price changes (changes in the basis of these equity investments to be reported in net income); (3) requires an entity that has elected the fair value option for financial liabilities to recognize changes in fair value due to instrument-specific credit risk separately in other comprehensive income; (4) clarified current guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities; and (5) requires specific disclosure pertaining to financial assets and financial liabilities in the financial statements. The accounting standard will be effective for

5

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Leases (ASU No. 2016-02)

In February 2016, the FASB issued an accounting standards update on a new lease standard that will supersede the existing lease guidance. The standard requires a lessee to recognize assets and liabilities related to long-term leases that are classified as operating leases under current guidance on its balance sheet. An asset would be recognized related to the right to use the underlying asset and a liability would be recognized related to the obligation to make lease payments over the term of the lease. The standard also requires expanded disclosures related to leases. The accounting standard will be effective for reporting periods beginning after December 15, 2018. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Investments-Equity Method and Joint Ventures (ASU No. 2016-07)

In March 2016, the FASB issued an accounting standards update providing new guidance for the accounting for equity method investments. The new guidance eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. In addition, the guidance requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The accounting standard will be effective for reporting periods beginning after December 15, 2016. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Stock Compensation (ASU No. 2016-09)

In March 2016, the FASB issued an accounting standards update to simplify several aspects of the accounting for share-based payment transactions, including income tax consequences, classifications of awards as either equity or liabilities and certain related classifications on the statement of cash flows. In addition, the new guidance permits entities to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. The accounting standard will be effective for reporting periods beginning after December 15, 2016 and is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Credit Losses (ASU No. 2016-13)

In June 2016, the FASB issued an accounting standards update providing new guidance for the accounting for credit losses on loans and other financial instruments. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. The standard also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The accounting standard will be effective for reporting periods beginning after December 15, 2019. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Cash Flows (ASU No. 2016-16)

In August 2016, the FASB issued an accounting standards update providing new guidance on the classification of certain cash receipts and payments including debt extinguishment costs, debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments, proceeds from the settlement of insurance claims and life insurance policies and distributions received from equity method investees in the statement of cash flows. This update is required to be applied using the retrospective transition method to each period presented unless it is impracticable to be applied retrospectively. In such situation, this guidance is to be applied prospectively. The accounting standard will be effective for reporting periods

6

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Recently Adopted Accounting Standards

Amendments to the Consolidation Analysis (ASU No. 2015-02)

In February 2015, the FASB issued an accounting standards update making certain changes to the current consolidation guidance. The amendments affect both the variable interest entity and voting interest entity consolidation models. The new standard changes the consideration of substantive rights, related party interests and fees paid to the decision maker when applying the variable interest entity consolidation model and eliminates certain guidance for limited partnerships and similar entities under the voting interest consolidation model. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Presentation of Debt Issuance Costs (ASU No. 2015-03)

In April 2015, the FASB issued an accounting standards update on simplifying the presentation of debt issuance costs, which requires all costs incurred to issue debt to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016. As a result, Other assets, net—Deferred charges and other assets, net and Long-term debt on the consolidated balance sheet as of December 31, 2015 have been adjusted to $176,625 and $758,148, respectively, from the originally reported $173,384 and $764,115, respectively, to reflect the retrospective application of the new accounting guidance. The adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

Intangibles—Goodwill and Other—Internal use software (ASU No. 2015-05)

In April 2015, the FASB issued an accounting standards update to provide clarification on accounting for cloud computing arrangements which include a software license. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The adoption did not have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Accounting for Measurement-Period Adjustments (ASU No. 2015-16)

In September 2015, the FASB issued an accounting standards update that requires an acquirer to recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The guidance requires that the acquirer record, in the same period's financial statements, the 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 if the accounting had been completed at the acquisition date. The new guidance further requires specific disclosure pertaining to the measurement period adjustments. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Balance Sheet Classification of Deferred Taxes (ASU No. 2015-17)

In November 2015, the FASB issued an accounting standards update that requires all deferred tax assets and liabilities, along with any related valuation allowance, to be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. The new guidance does not change the existing requirement that only permits offsetting within a jurisdiction. The accounting standard is required to be adopted for reporting periods beginning after December 15, 2016; however, early adoption of this standard is permitted. The Company elected to early adopt this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The early adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

7

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

2. Acquisition

On August 31, 2016, the Company completed its previously announced acquisition of, and acquired all the remaining equity interest in, Axiall Corporation ("Axiall"), a Delaware corporation. Prior to the acquisition, the Company held 3.1 million shares in Axiall. Pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of June 10, 2016, by and among Westlake, Axiall and Lagoon Merger Sub, Inc., a Delaware corporation that is a wholly-owned subsidiary of Westlake ("Merger Sub"), the Company acquired all of the issued and outstanding shares of common stock of Axiall for $33.00 per share in cash. Pursuant to the Merger Agreement, Merger Sub was merged with and into Axiall (the "Merger"), and Axiall survived the Merger as a wholly-owned subsidiary of the Company. The combined company is the third-largest global chlor-alkali producer and the third-largest global polyvinyl chloride ("PVC") producer. The Company's management believes that this strategic acquisition will enhance its strategy of integration and will further strengthen its role in the North American markets.

Axiall produces a highly integrated chain of chlor-alkali and derivative products, including chlorine, caustic soda, vinyl chloride monomer ("VCM"), vinyl resins, ethylene dichloride (OR 1, 2 dichloroethane), chlorinated solvents, calcium hypochlorite and hydrochloric acid, and compound products. Axiall also manufactures and sells building products, including interior and exterior trim and mouldings products, deck products, siding, pipe and pipe fittings. Substantially all of the vinyl resin used to manufacture Axiall's building products is sourced internally.

Total consideration transferred for the Axiall Merger was $2,526,080. The Merger is being accounted for under the acquisition method of accounting. The assets acquired and liabilities assumed and the results of operations of the acquired business are included in the Company's Vinyls segment.

The acquired business contributed net sales and net loss of $257,407 and ($47,164), respectively, to the Company for the period from August 31, 2016 to September 30, 2016. The net loss for the period from August 31, 2016 to September 30, 2016 included integration-related costs and the negative impact of selling higher cost Axiall inventory recorded at fair value. The following unaudited consolidated pro forma information presents consolidated information as if the Merger had occurred on January 1, 2015:

	Pro Forma Nine Months Ended September 30,
	2016		2015
Net sales	$	5,345,365	$	6,053,330
Net income (1)	$	284,324	$	595,442
Net income (loss) attributable to noncontrolling interest	16,404		(5,953		)
Net income attributable to Westlake Chemical Corporation (1)	$	267,920	$	601,395
Earnings per common share attributable to Westlake Chemical Corporation
Basic	$	2.06	$	4.54
Diluted	$	2.05	$	4.52

_____________

(1) The 2016 pro forma net income amounts include Axiall's historical charges recorded during the eight-month period prior to the closing of the Merger for (1) divestitures; (2) restructuring; and (3) legal and settlement claims, net, of $26,666, $22,881 and $23,376, respectively. These amounts have not been eliminated for pro forma purposes because they do not relate to nonrecurring transaction specific costs related to the Merger.

The pro forma amounts above have been calculated after applying the Company's accounting policies and adjusting the Axiall results to reflect (1) the increase to depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied from January 1, 2015; (2) the elimination of net sales and cost of sales between the Company and Axiall; (3) additional pension service costs; (4) amortization of debt premium and accretion of asset retirement obligations and environmental liabilities as part of the Company's adjustments to fair value; (5) incremental interest expense that would have been incurred assuming the financing arrangements entered by the Company and repayment of a portion of Axiall's outstanding debt had occurred on January 1, 2015; (6) the elimination of transaction-related costs; (7) the elimination of Axiall's goodwill impairment charges for the nine months ended September 30, 2015 and (8) an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory

8

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

income tax rate of the jurisdictions to which the above adjustments relate. The pro forma amounts do not include any potential synergies, cost savings or other expected benefits of the Merger, are presented for illustrative purposes only and are not necessarily indicative of results that would have been achieved if the Merger had occurred as of January 1, 2015 or of future operating performance.

For the nine months ended September 30, 2016, the Company recognized $90,550 of transaction and integration-related costs. This included acquisition-related costs of $43,895 for advisory, consulting and professional fees and other expenses. Transaction and integration-related costs for the nine months ended September 30, 2016 also included $46,655 related to settlement of Axiall share-based awards, retention agreement costs and severance benefits provided to former Axiall executives in connection with the Merger.

The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition. The preliminary allocation of the consideration transferred is based on management's estimates, judgments and assumptions. When determining the fair values of assets acquired, liabilities assumed and noncontrolling interests of the acquiree, management made significant estimates, judgments and assumptions. These estimates, judgments and assumptions are subject to change upon final valuation and should be treated as preliminary values. Management estimated that consideration paid exceeded the fair value of the net assets acquired. Therefore, goodwill of $863,144 was recorded. The goodwill recognized is primarily attributable to synergies related to the Company's vinyls integration strategy that are expected to arise from the Merger. All of the goodwill is assigned to the Company's Vinyls segment. As a portion of the goodwill arising from the Merger is attributable to foreign operations, there will be a continuing foreign currency impact to goodwill on the financial statements.

Closing stock purchase:
Offer per share	$	33.00
Multiplied by number of shares outstanding at acquisition	67,277
Fair value of Axiall shares outstanding purchased by the Company	$	2,220,141
Axiall debt repaid at acquisition	247,135
Seller's transaction costs paid by the Company (1)	47,458
Fair value of Axiall share-based awards attributed to pre-combination service (2)	11,346
Purchase consideration transferred	$	2,526,080
Fair value of previously held equity interest in Axiall (3)	102,300
Total fair value allocated to net assets acquired	$	2,628,380

_____________

(1) Transactions costs incurred by the seller include legal and advisory costs incurred for the benefit of Axiall's former shareholders and board of directors to evaluate the Company's initial Merger proposals, explore strategic alternatives and negotiate the purchase price.

(2) The fair value of share-based awards attributable to pre-combination service includes the ratio of the pre-combination service performed to the original service period of the Axiall restricted share units and options, including related dividend equivalent rights.

(3) Prior to the Merger, the Company owned 3.1 million shares in Axiall. The investment in Axiall was carried at estimated fair value with unrealized gains recorded as a component of accumulated other comprehensive loss on the consolidated balance sheet. The Company recognized a $49,080 gain for the investment in other income, net in the consolidated statement of operations upon gaining control.

The final allocation of purchase consideration, based on final valuations, could include changes in the estimated fair value of (1) inventories; (2) property, plant and equipment; (3) equity investments; (4) customer relationships, trade names, developed technologies and other intangibles; (5) deferred income taxes; (6) all contingencies; (7) asset retirement obligations; and (8) noncontrolling interests. The assumed contingencies relate to environmental liabilities, legal liabilities, asset retirement obligations and warranty reserves that are provisionally recorded based on estimated fair value.

9

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The information below represents the preliminary purchase price allocation:

Cash	$	88,251
Accounts receivable	422,023
Income tax receivable	48,398
Inventories	302,868
Prepaid expenses and other current assets	48,435
Property, plant and equipment	3,189,582
Customer relationships (weighted average life of 10.7 years)	560,000
Other intangible assets:
Trade name (weighted average life of 6.8 years)	50,000
Technology (weighted average life of 5.4 years)	41,500
Supply contracts and leases (weighted average life of 6.0 years)	26,710
Other assets	105,214
Total assets acquired	4,882,981
Accounts and notes payable	253,967
Interest payable	8,154
Income tax payable	1,921
Accrued compensation	30,057
Accrued liabilities	165,793
Deferred income taxes	973,799
Tax reserve non-current	3,130
Pension and other post retirement obligations	311,106
Other liabilities	114,528
Long-term debt	1,187,290
Total liabilities assumed	3,049,745
Total identifiable net assets acquired	1,833,236
Noncontrolling interest	(68,000		)
Goodwill	863,144
Total purchase consideration	$	2,628,380

3. Financial Instruments

Cash Equivalents

The Company had $1,942 and $221,918 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at September 30, 2016 and December 31, 2015, respectively. The Company's investments in held-to-maturity securities are held at amortized cost, which approximates fair value.

Restricted Cash

The Company had restricted cash and cash equivalents of $195,705 at September 30, 2016, which are primarily related to the balances deposited with and held as security by the lender under the Company's current term loan facility and for distributions to certain of Axiall's current and former employees. The current and non-current restricted cash and cash equivalents of $169,320 and $26,385, respectively, is reflected under current assets and as a component of other assets, net—Deferred charges and other assets, net, respectively, on the consolidated balance sheet. The Company had no restricted cash balances at December 31, 2015.

10

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Available-for-Sale Marketable Securities

The Company had no available-for-sale securities at September 30, 2016. Investments in available-for-sale securities at December 31, 2015 were classified as follows:

	December 31, 2015
Current	$	520,144
Non-current	48,081
Total available-for-sale securities	$	568,225

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company's available-for-sale securities were as follows:

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	336,665	$	55	$	(1,076	)	$	335,644
U.S. government debt (2)	135,226		2		(374		)	134,854
Asset-backed securities	49,759		2		(115		)	49,646
Equity securities	54,371		466		(6,756		)	48,081
Total available-for-sale securities	$	576,021	$	525	$	(8,321	)	$	568,225

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S. government agency mortgage-backed securities.

As of December 31, 2015, net unrealized losses on the Company's available-for-sale securities of $4,995, net of income tax benefit of $2,801, were recorded in accumulated other comprehensive loss.

The proceeds from sales and maturities of available-for-sale securities included in the consolidated statements of cash flows and the gross realized gains and losses included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Proceeds from sales and maturities of securities	$	360,506	$	1,019	$	662,938	$	16,056
Gross realized gains	52,414		—		53,755		3,795
Gross realized losses	13		—		35		—

4. Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2016			December 31, 2015
Trade customers	$	923,499		$	438,538
Allowance for doubtful accounts	(15,322		)	(14,095		)
	908,177			424,443
Federal and state taxes	134,733			60,748
Other	27,591			23,341
Accounts receivable, net	$	1,070,501		$	508,532

11

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

5. Inventories

Inventories consist of the following:

	September 30, 2016		December 31, 2015
Finished products	$	466,165	$	253,338
Feedstock, additives and chemicals	199,827		106,435
Materials and supplies	78,544		74,287
Inventories	$	744,536	$	434,060

6. Property, Plant and Equipment

As of September 30, 2016, the Company had property, plant and equipment, net totaling $6,450,947. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include, but are not limited to, significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Depreciation expense on property, plant and equipment of $75,143 and $52,208 is primarily included in cost of sales in the consolidated statements of operations for the three months ended September 30, 2016 and 2015, respectively. Depreciation expense on property, plant and equipment of $189,114 and $153,129 is primarily included in cost of sales in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015, respectively.

7. Other Assets

Amortization expense on intangible and other assets of $19,175 and $9,419 is included in the consolidated statements of operations for the three months ended September 30, 2016 and 2015, respectively. Amortization expense on intangible and other assets of $38,340 and $28,235 is included in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015, respectively.

Goodwill

The gross carrying amounts of goodwill and the changes in the carrying amount of goodwill for the nine months ended September 30, 2016 were as follows:

	Olefins Segment		Vinyls Segment		Total
Balance at December 31, 2015	$	29,990	$	32,026	$	62,016
Goodwill acquired during the period	—		863,144		863,144
Effects of changes in foreign exchange rates	—		540		540
Balance at September 30, 2016	$	29,990	$	895,710	$	925,700

8. Accounts and Notes Payable

Accounts and notes payable consist of the following:

	September 30, 2016		December 31, 2015
Accounts payable	$	502,378	$	229,219
Notes payable to banks	1,010		6,110
Accounts and notes payable	$	503,388	$	235,329

12

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

9. Term Loan

On August 10, 2016, an indirect subsidiary of the Company, Westlake International Holdings II C.V., a limited partnership organized under the laws of the Netherlands (the "CV Borrower"), entered into a credit agreement with Bank of America, N.A., as agent and lender, providing the CV Borrower with a $150,000 term loan facility. The term loan facility matures on March 31, 2017. The loans thereunder bear interest at a floating interest rate equal to LIBOR plus 2.0% per annum, payable in arrears on the last day of each three-month period following the date of funding and at maturity. The CV Borrower may elect to convert the interest rate to a base rate with a 1.0% spread. The interest rate on the outstanding term loan was 2.82% at September 30, 2016.

The facility contains customary covenants and events of default that impose certain operating and financial restrictions on the CV Borrower and certain of its subsidiaries. These restrictions, among other things, provide limitations on the incurrence of additional indebtedness and liens and the ability to engage in certain transactions with affiliates.

Pursuant to the credit agreement, all of the non-U.S. subsidiaries of the Company are to remain owned, directly or indirectly, by the CV Borrower and its wholly owned subsidiary, Westlake International II LLC, a Delaware limited liability company ("WII LLC"). The CV Borrower is also required, together with its subsidiaries, to maintain at all times unencumbered cash and cash equivalents in a U.S. dollar equivalent of not less than $150,000, which amount shall be increased by 5% to the extent maintained in non-U.S. currencies. In connection therewith, an amount of cash and cash equivalents for the period (a) from the closing date until the date 30 days thereafter, not less than $50,000, and (b) thereafter, not less than $75,000, shall be maintained by the CV Borrower and its subsidiaries in accounts at Bank of America, N.A., in accordance with existing cash management agreements.

Obligations under the term loan facility are secured by a pledge of 65% of the membership interests of WII LLC as well as rights under the partnership agreement of Westlake International Holdings C.V., a limited partnership organized under the laws of the Netherlands, held by WII LLC and the CV Borrower.

10. Long-Term Debt

The Company adopted an accounting standards update to simplify the presentation of debt issuance costs effective January 1, 2016. The standard requires, on a retrospective basis, all costs incurred to issue debt, excluding line-of-credit arrangements, to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability. As a result, Other assets, net—Deferred charges and other assets, net and Long-term debt on the consolidated balance sheet as of December 31, 2015 have been adjusted to $176,625 and $758,148, respectively, from the originally reported $173,384 and $764,115, respectively, to reflect the retrospective application of the new accounting guidance.

13

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Long-term debt consists of the following:

	September 30, 2016							December 31, 2015
	Principal Amount		Unamortized Premium, Discount and Debt Issuance Costs (1)			Net Long-term Debt		Principal Amount		Unamortized Discount and Debt Issuance Costs  (1)			Net Long-term Debt
Revolving credit facility	$	325,000	$	—		$	325,000	$	—	$	—		$	—
4.625% senior notes due 2021 (the    "4.625% Westlake 2021 Senior Notes")	624,793		28,463			653,256		—		—			—
4.625% senior notes due 2021    (the "4.625% Subsidiary 2021 Senior    Notes")	63,207		3,036			66,243		—		—			—
3.60% senior notes due 2022	250,000		(1,976		)	248,024		250,000		(2,232		)	247,768
4.875% senior notes due 2023 (the    "4.875% Westlake 2023 Senior Notes")	433,793		13,958			447,751		—		—			—
4.875% senior notes due 2023    (the "4.875% Subsidiary 2023 Senior    Notes")	16,207		562			16,769		—		—			—
3.60% senior notes due 2026    (the "3.60% 2026 Senior Notes")	750,000		(10,918		)	739,082		—		—			—
Loan related to tax-exempt waste    disposal revenue bonds due 2027	10,889		—			10,889		10,889		—			10,889
6 ½% senior notes due 2029	100,000		(934		)	99,066		100,000		(989		)	99,011
6 ¾% senior notes due 2032	250,000		(1,913		)	248,087		250,000		(2,002		)	247,998
6 ½% senior notes due 2035 (the "6 ½%    2035 GO Zone Senior Notes")	89,000		(851		)	88,149		89,000		(884		)	88,116
6 ½% senior notes due 2035 (the "6 ½%    2035 IKE Zone Senior Notes")	65,000		(610		)	64,390		65,000		(634		)	64,366
5.0% senior notes due 2046 (the "5.0%    2046 Senior Notes")	700,000		(26,121		)	673,879		—		—			—
Long-term debt, net	$	3,677,889	$	2,696		$	3,680,585	$	764,889	$	(6,741	)	$	758,148

_____________

(1) Includes unamortized debt issuance costs of $21,286 and $5,967 at September 30, 2016 and December 31, 2015, respectively.

Credit Agreement

On August 23, 2016, the Company and certain of its subsidiaries entered into an unsecured revolving credit facility (the "Credit Agreement"), by and among the Company, the other borrowers and guarantors referred to therein, the lenders from time to time party thereto (collectively, the "Lenders"), the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent. Under the Credit Agreement, the Lenders have committed to provide an unsecured five-year revolving credit facility in an aggregate principal amount of up to $1,000,000. The Credit Agreement replaced the Company's existing $400,000 senior secured third amended and restated credit facility, dated as of July 17, 2014, by and among the Company, the financial institutions party thereto, as lenders, Bank of America, N.A., as agent, and the Company and certain of its subsidiaries, as borrowers. The Credit Agreement includes a $150,000 sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under the facility. The Credit Agreement also provides for a discretionary $50,000 commitment for swing line loans to be provided on a same-day basis. The Company may also increase the size of the facility, in increments of at least $25,000, up to a maximum of $500,000, subject to certain conditions and if certain Lenders agree to commit to such an increase.

At September 30, 2016, the Company had $325,000 of borrowings outstanding under the Credit Agreement. Borrowings under the Credit Agreement will bear interest, at the Company's option, at either (a) LIBOR plus a spread ranging from 1.0% to

14

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

1.75% that will vary depending on the credit rating of the Company or (b) Alternate Base Rate plus a spread ranging from 0.0% to 0.75% that will vary depending on the credit rating of the Company. The Credit Agreement also requires an undrawn commitment fee ranging from 0.10% to 0.25% that will vary depending on the credit rating of the Company. The interest rate on the outstanding revolving credit facility was 2.05% at September 30, 2016. The Credit Agreement matures on August 23, 2021. As of September 30, 2016, the Company had outstanding letters of credit totaling $76,581 and borrowing availability of $598,419 under the Credit Agreement.

The obligations of the Company under the Credit Agreement are guaranteed by current and future material domestic subsidiaries of the Company, subject to customary exceptions. The Credit Agreement contains customary affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant. The Credit Agreement also contains customary events of default and if and for so long as an event of default has occurred and is continuing, any amounts outstanding under the Credit Agreement will accrue interest at an increased rate, the Lenders can terminate their commitments thereunder and payments of any outstanding amounts could be accelerated by the Lenders. As of September 30, 2016, the Company is in compliance with the total leverage ratio financial maintenance covenant.

3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046

On August 10, 2016, the Company completed its private offering of $750,000 aggregate principal amount of 3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes") and $700,000 aggregate principal amount of 5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes"). The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. The Company has entered into a registration rights agreement in which it has agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes. The net proceeds from the offering were used to finance the Merger and to repay amounts under the term loan facility dated February 27, 2015 entered into by Axiall Holdco, Inc. (a wholly-owned subsidiary of Axiall), as the borrower, with the financial institutions party thereto. The indenture governing the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its 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 the Company's or their assets.

Exchange Offers

On September 7, 2016, the Company completed offers to exchange (the "Axiall Exchange Offers") any and all of the $688,000 aggregate principal amount of the outstanding 4.625% senior notes due 2021 (the "4.625% Subsidiary 2021 Senior Notes") issued by Eagle Spinco Inc. ("Eagle Spinco"), a wholly-owned subsidiary of Axiall, and the $450,000 aggregate principal amount of the outstanding 4.875% senior notes due 2023 (the "4.875% Subsidiary 2023 Senior Notes" and, together with the 4.625% Subsidiary 2021 Senior Notes, the "Subsidiary Notes") issued by Axiall for new senior notes issued by the Company having the same maturity and interest rates as the Subsidiary Notes. The 4.625% Subsidiary 2021 Senior Notes and the 4.875% Subsidiary 2023 Senior Notes were assumed at fair value, which resulted in a premium on the Subsidiary Notes of $33,540 and $15,750, respectively. In the Axiall Exchange Offers, $624,793 aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $433,793 aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes were exchanged, respectively, for $624,793 aggregate principal amount of 4.625% senior notes due 2021 (the "4.625% Westlake 2021 Senior Notes") and $433,793 aggregate principal amount of 4.875% senior notes due 2023 (the "4.875% Westlake 2023 Senior Notes") issued by the Company, leaving outstanding $63,207 aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $16,207 aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes. The Subsidiary Notes are the senior unsecured obligations of Axiall and Eagle Spinco, respectively. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. The Company has entered into a registration rights agreement in which it has agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes. The indenture governing the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its subsidiaries' ability

15

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of the Company's or their assets.

Bridge Loan Agreement

In June 2016, in connection with the Axiall acquisition, the Company entered into a commitment letter with various lenders pursuant to which such lenders agreed to provide for a senior unsecured bridge loan facility of up to $1,765,000 in the aggregate. Also in June 2016, the Company paid structuring and other fees of approximately $9,700 in connection with the senior unsecured bridge loan facility. On August 26, 2016, the Company terminated the senior unsecured bridge loan facility and expensed the remaining $8,900 of structuring and other fees paid for the senior unsecured bridge loan facility. This amount is included in other income, net, in the consolidated statements of operations for the three and nine months ended September 30, 2016.

11. Pension and Post-Retirement Benefits

In connection with the Merger, the Company assumed certain U.S. and non-U.S. pension plans and other post-retirement benefit plans covering Axiall employees. The Axiall pension plans are closed to new participants and provide benefits to certain employees and retirees. The other post-retirement benefit plans are unfunded and provide medical and life insurance benefits for certain employees and their dependents. See Note 2 for the fair value of pension and other post-retirement obligations assumed in the Merger.

Defined Benefit Plans

Components of net periodic benefit cost for the Company's pension plans are as follows:

	Three Months Ended September 30,											Nine Months Ended September 30,
	2016						2015					2016						2015
	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
Service cost	$	315		$	318		$	—		$	416	$	315		$	777		$	29		$	1,248
Expected administrative    expenses	730			—			—			—		730			—			—			—
Interest cost	2,191			622			487			528		1,553			1,763			1,519			1,585
Expected return on plan assets	(3,800		)	(50		)	(712		)	—		(5,260		)	(50		)	(2,237		)	—
Amortization of net loss	338			—			333			263		978			—			942			789
Net periodic benefit (income)    cost	$	(226	)	$	890		$	108		$	1,207	$	(1,684	)	$	2,490		$	253		$	3,622

The Company made no contribution to its U.S. pension plans in the first nine months of 2016. The Company contributed $349 to its U.S. pension plans in the first nine months of 2015. The Company's funding policy for its U.S. plans is consistent with the minimum funding requirements of federal law and regulations, and based on preliminary estimates, the Company does not expect to make contributions to its U.S. pension plans for the remainder of fiscal year ending December 31, 2016. The Company expects to make contributions of approximately $200 for its non-U.S. pension plans during the remainder of the fiscal year ending December 31, 2016.

16

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Other Post-retirement Benefits

Components of net periodic benefit cost for the Company's other post-retirement benefits are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016				2015		2016				2015
	U.S. Plans		Non-U.S. Plans		U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans
Service cost	$	72	$	1	$	6	$	81	$	1	$	17
Interest cost	250		3		149		540		3		448
Amortization of net loss	31		—		96		94		—		288
Net periodic benefit cost	$	353	$	4	$	251	$	715	$	4	$	753

12. Stockholders' Equity

Changes in stockholders' equity for the nine months ended September 30, 2016 and 2015 were as follows:

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2015	$	1,347	$	(258,312	)	$	542,148		$	3,109,987		$	(129,292	)	$	296,053		$	3,561,931
Net income	—		—			—			299,914			—			14,656			314,570
Other comprehensive income,    net of income taxes:
Pension and other post-    retirement benefits    liability	—		—			—			—			409			—			409
Foreign currency    translation adjustments	—		—			—			—			15,758			—			15,758
Net unrealized holding    gains on investments	—		—			—			—			4,999			—			4,999
Common stock repurchased	—		(66,725		)	—			—			—			—			(66,725		)
Shares issued—stock-    based compensation	—		5,057			(3,407		)	—			—			—			1,650
Stock-based compensation,    net of tax on stock options    exercised	—		—			7,778			—			—			—			7,778
Dividends paid	—		—			—			(71,933		)	—			—			(71,933		)
Distributions to noncontrolling    interests	—		—			—			—			—			(12,300		)	(12,300		)
Noncontrolling interest in    acquired business	—		—			—			—			—			68,000			68,000
Balances at September 30, 2016	$	1,347	$	(319,980	)	$	546,519		$	3,337,968		$	(108,126	)	$	366,409		$	3,824,137

17

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2014	$	1,347	$	(96,372	)	$	530,441		$	2,555,528		$	(79,433	)	$	290,377		$	3,201,888
Net income	—		—			—			535,041			—			13,847			548,888
Other comprehensive income    (loss), net of income taxes
Pension and other post-    retirement benefits    liability	—		—			—			—			1,190			—			1,190
Foreign currency    translation adjustments	—		—			—			—			(43,746		)	—			(43,746		)
Net unrealized holding    gains on investments	—		—			—			—			124			—			124
Common stock repurchased	—		(122,249		)	—			—			—			—			(122,249		)
Shares issued—stock-    based compensation	—		1,079			(95		)	—			—			—			984
Stock-based compensation,    net of tax on stock options    exercised	—		—			9,996			—			—			—			9,996
Dividends paid	—		—			—			(67,852		)	—			—			(67,852		)
Distributions to noncontrolling    interests	—		—			—			—			—			(10,982		)	(10,982		)
Noncontrolling interest in    acquired business	—		—			—			—			—			1,597			1,597
Balances at September 30, 2015	$	1,347	$	(217,542	)	$	540,342		$	3,022,717		$	(121,865	)	$	294,839		$	3,519,838

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2016 and 2015 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains (Losses) on Investments, Net of Tax (1)			Total
Balances at December 31, 2015	$	(8,607	)	$	(115,690	)	$	(4,995	)	$	(129,292	)
Other comprehensive (loss) income before    reclassifications	(252		)	15,758			57,550			73,056
Amounts reclassified from accumulated other    comprehensive loss (income)	661			—			(52,551		)	(51,890		)
Net other comprehensive income for the period	409			15,758			4,999			21,166
Balances at September 30, 2016	$	(8,198	)	$	(99,932	)	$	4		$	(108,126	)

_____________

(1) Includes other comprehensive income from equity method investment.

18

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains on Investments, Net of Tax			Total
Balances at December 31, 2014	$	(23,442	)	$	(56,224	)	$	233		$	(79,433	)
Other comprehensive (loss) income before    reclassifications	(128		)	(43,746		)	2,556			(41,318		)
Amounts reclassified from accumulated other    comprehensive loss (income)	1,318			—			(2,432		)	(1,114		)
Net other comprehensive income (loss) for the period	1,190			(43,746		)	124			(42,432		)
Balances at September 30, 2015	$	(22,252	)	$	(99,970	)	$	357		$	(121,865	)

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015:

Details about Accumulated    Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016			2015
Amortization of pension and    other post-retirement items
Net loss	(1)	$	(369	)	$	(692	)	$	(1,072	)	$	(2,019	)
	Provision for    income taxes	141			241			411			701
		(228		)	(451		)	(661		)	(1,318		)
Net unrealized gains on    available-for-sale    investments
Realized gain on    available-for-sale    investments	Other income, net	52,401			—			53,720			3,795
	Provision for    income taxes	(696		)	—			(1,169		)	(1,363		)
		51,705			—			52,551			2,432
Total reclassifications for    the period		$	51,477		$	(451	)	$	51,890		$	1,114

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 11 (Employee Benefits) to the financial statements included in the 2015 Form 10-K.

13. Stock-Based Compensation

Under the Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated, 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 of common 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 may be 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 performance award). Total stock-based compensation expense related to the 2013 Plan was $1,502 and $2,639 for the three months ended September 30, 2016 and 2015,respectively, and $6,588 and $7,544 for the nine months ended September 30, 2016 and 2015,respectively.

Under the Merger Agreement, all outstanding Axiall restricted stock units were assumed by the Company and converted into restricted stock units in respect of the Company's common stock, with the same terms and conditions except that upon

19

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

settlement the award holders will receive the greater of (1) the value of $33.00 per Axiall restricted stock unit that was converted into a restricted stock unit in respect of the Company's common stock and (2) the value of the Company's common stock. The awards are classified as liability awards for financial accounting purposes and are re-measured at each reporting date until they vest. The portion of the replacement award that is attributable to pre-combination service by the employee is included in the measure of consideration transferred to acquire Axiall. The remaining fair value of the replacement awards will be recognized as stock-based compensation expense over the remainder of the vesting period. Total stock-based compensation expense recognized related to the Merger Agreement for the three and nine months ended September 30, 2016 was $34,915, of which $32,644 is included in transaction and integration-related costs in the consolidated statements of operations.

14. Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in gross profit in the consolidated statements of operations for the three and nine months ended September 30, 2016 and 2015.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	2,221	$	3,465
Commodity forward contracts	Other assets, net	3,674		2,088
Total derivative assets		$	5,895	$	5,553

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	3,196	$	9,325
Commodity forward contracts	Other liabilities	6,811		12,437
Total derivative liabilities		$	10,007	$	21,762

20

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized  in Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016		2015
Commodity forward contracts	Gross profit	$	(7,840	)	$	(9,314	)	$	7,784	$	(4,478	)

See Note 15 for the fair value of the Company's derivative instruments.

Disclosure about Offsetting Asset and Liability Derivatives

Certain of the Company's derivative instruments are executed under an International Swaps and Derivatives Association ("ISDA") Master Agreement, which permits the Company and a counterparty to aggregate the amounts owed by each party under multiple transactions and replace them with a single net amount payable by one party to the other. The following tables present the Company's derivative assets and derivative liabilities reported on the consolidated balance sheets and derivative assets and derivative liabilities subject to enforceable master netting arrangements.

	Derivative Assets as of
	September 30, 2016		December 31, 2015
Derivative assets subject to enforceable master netting arrangements	$	—	$	—
Derivative assets not subject to enforceable master netting arrangements	3,560		462
Total derivative assets	$	3,560	$	462

	September 30, 2016							December 31, 2015
Offsetting of Derivative Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	2,335	$	(2,335	)	$	—	$	5,091	$	(5,091	)	$	—

	Derivative Liabilities as of
	September 30, 2016		December 31, 2015
Derivative liabilities subject to enforceable master netting arrangements	$	1,889	$	5,803
Derivative liabilities not subject to enforceable master netting arrangements	5,782		10,868
Total derivative liabilities	$	7,671	$	16,671

	September 30, 2016							December 31, 2015
Offsetting of Derivative Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	4,224	$	(2,335	)	$	1,889	$	10,894	$	(5,091	)	$	5,803

21

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	September 30, 2016						December 31, 2015
Derivative Liabilities by Counterparty	Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount		Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount
Counterparty A	$	1,889	$	—	$	1,889	$	5,564	$	—	$	5,564
Counterparty B	—		—		—		239		—		239
Total	$	1,889	$	—	$	1,889	$	5,803	$	—	$	5,803

15. Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). 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.

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2016
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	1,551		$	4,344		$	5,895
Risk management liabilities—Commodity forward contracts	(8,091		)	(1,916		)	(10,007		)
	December 31, 2015
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	5,553		$	—		$	5,553
Risk management liabilities—Commodity forward contracts	(11,648		)	(10,114		)	(21,762		)
Marketable securities
Available-for-sale securities	48,081			520,144			568,225

The Level 2 measurements for the Company's commodity contracts are derived using forward curves supplied by industry-recognized and unrelated third-party services. The Level 2 measurements for the Company's available-for-sale securities are derived using market-based pricing provided by unrelated third-party services.

There were no transfers in or out of Levels 1 and 2 of the fair value hierarchy for the nine months ended September 30, 2016 and 2015.

22

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts and notes payable and current and long-term debt, all of which are recorded at carrying value. The amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net, accounts and notes payable and current term loan approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company's long-term debt are summarized in the table below. The fair value of the Company's long-term debt instruments is determined using a market approach, based upon quotes from financial reporting services. Because the Company's long-term debt instruments may not be actively 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.

	September 30, 2016				December 31, 2015
	Carrying Value		Fair Value		Carrying Value		Fair Value
Revolving credit facility	$	325,000	$	325,000	$	—	$	—
4.625% Westlake 2021 Senior Notes	653,256		653,715		—		—
4.625% Subsidiary 2021 Senior Notes	66,243		66,058		—		—
3.60% senior notes due 2022	248,024		251,480		247,768		244,828
4.875% Westlake 2023 Senior Notes	447,751		454,151		—		—
4.875% Subsidiary 2023 Senior Notes	16,769		16,954		—		—
3.60% 2026 Senior Notes	739,082		752,055		—		—
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889		10,889		10,889
6 ½% senior notes due 2029	99,066		117,726		99,011		117,153
6 ¾% senior notes due 2032	248,087		265,383		247,998		268,490
6 ½% 2035 GO Zone Senior Notes	88,149		105,298		88,116		106,491
6 ½% 2035 IKE Zone Senior Notes	64,390		76,837		64,366		76,741
5.0% 2046 Senior Notes	673,879		705,985		—		—

The carrying values of the Company's long-term debt as of December 31, 2015 have been adjusted to reflect the retrospective application of the accounting standards update on simplifying the presentation of debt issuance costs discussed in Note 10.

16. Income Taxes

The Company elected to early adopt an accounting standards update requiring the noncurrent classification of all deferred tax assets and liabilities, along with any related valuation allowance, effective January 1, 2016. As a result, the Company's deferred tax assets and liabilities have been classified, by jurisdiction, as a net noncurrent deferred tax asset or liability on the consolidated balance sheet. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted.

The effective income tax rate was (10.3)% for the three months ended September 30, 2016. The effective tax rate for the 2016 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 24.2% for the three months ended September 30, 2015. The effective income tax rate for the 2015 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the foreign earnings rate differential, the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed, partially offset by state income taxes.

23

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The effective income tax rate was 29.1% for the nine months ended September 30, 2016. The effective tax rate for the 2016 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 30.1% for the nine months ended September 30, 2015. The effective income tax rate for the 2015 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the non-recognition of tax related to the bargain purchase of a controlling interest in Suzhou Huasu Plastics Co., Ltd., the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes.

There are total gross unrecognized tax benefits of $8,818 for the nine months ended September 30, 2016. The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. The majority of the total unrecognized tax benefits relate to historical balances reported by Axiall prior to the Merger. For the three months ended September 30, 2016, the Company accrued interest and penalties in the amount of $206 related to uncertain tax positions.

Reconciliations of the unrecognized tax benefits for the three months ended September 30, 2016 are set forth in the table below:

Balance as of June 30, 2016	$	—
Amounts attributable to Axiall pre-acquistion	5,471
Additions during the three months ended September 30, 2016	3,444
Reduction during the three months ended September 30, 2016 due to expiration of statute of limitations	(92		)
Foreign currency translation	(5		)
Balance as of September 30, 2016	$	8,818

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2010.

For the nine months ended September 30, 2016, the Company is not permanently reinvested with respect to the outside basis difference for all of its foreign subsidiaries. The Company is asserting under ASC 740-30 that the unremitted earnings of some of its foreign subsidiaries are permanently reinvested outside the U.S. For these foreign subsidiaries, the earnings and profits (E&P) is estimated to be $204,154 at December 31, 2016. If no assertion were made to permanently reinvest any of these unremitted foreign earnings, U.S. income tax expense of approximately $32,272 relating to U.S. tax would be recorded. Such expense takes into account utilization of foreign tax credits. The Company is not asserting under ASC 740-30 for certain other foreign subsidiaries. As such, the Company recorded a deferred tax liability (and related tax expense) of $1,837. Of this amount, $1,169 has been recorded to recognize the foreign taxes that would result if earnings in lower-tier foreign subsidiaries would be distributed up the foreign ownership chain to a subsidiary where an assertion is made. In addition, $668 has been recorded to recognize the U.S. tax impact of the unremitted foreign earnings of the Company's Taiwanese subsidiary based on four months of activity from acquisition date to the year ended December 31, 2016. The Taiwanese subsidiary is expected to make annual distributions to the Company.

24

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

17. Earnings per Share

The Company has unvested shares of restricted stock and restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Less:
Net income attributable to participating securities	(294		)	(195		)	(1,347		)	(653		)
Net income attributable to common shareholders	$	65,368		$	183,409		$	298,567		$	534,388

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Weighted average common shares—basic	128,793,661		131,664,296		129,519,577		132,301,814
Plus incremental shares from:
Assumed exercise of options	586,295		456,939		584,320		484,720
Weighted average common shares—diluted	129,379,956		132,121,235		130,103,897		132,786,534
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	0.51	$	1.39	$	2.31	$	4.04
Diluted	$	0.51	$	1.39	$	2.29	$	4.02

Excluded from the computation of diluted earnings per share are options to purchase 620,010 and 315,285 shares of common stock for the three months ended September 30, 2016 and 2015, respectively, and 577,254 and 295,825 shares of common stock for the nine months ended September 30, 2016 and 2015, respectively. These options were outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive.

18. Supplemental Information

Accrued Liabilities

Accrued liabilities were $552,581 and $287,313 at September 30, 2016 and December 31, 2015, respectively. Accrued rebates, which is a component of accrued liabilities, was $73,798 and $46,460 at September 30, 2016 and December 31, 2015, respectively. No other component of accrued liabilities was more than five percent of total current liabilities.

25

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Other Income, Net

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Interest income	$	537		$	1,631		$	6,899		$	3,383
Dividend income	868			—			5,142			3,328
Acquisition-related financing costs	(11,420		)	—			(12,220		)	—
Foreign exchange currency (losses) gains, net	(1,281		)	(731		)	(2,435		)	1,140
Impairment of equity method investment	—			—			—			(4,925		)
Gain realized on previously held shares of Axiall    common stock	49,080			—			49,080			—
Gain on acquisition and related expenses, net	—			—			—			20,430
Gains from sales of securities, net	3,321			—			4,640			3,795
Other	160			1,736			985			6,639
Other income, net	$	41,265		$	2,636		$	52,091		$	33,790

19. Insurance Recovery

During the second and third quarters of 2015, the Company's production rates and operating costs at its Knapsack, Germany and Cologne, Germany facilities were negatively impacted due to an interruption of feedstock supply as a result of a fire at a third-party supplier's ethylene production facility. During the nine months ended September 30, 2016, the Company received a final insurance recovery of approximately $2,670 related to business interruption costs. The insurance recovery is included in cost of sales in the consolidated statement of operations. The Company had received and recognized approximately $7,809 as a partial insurance recovery during the year ended December 31, 2015.

20. Commitments and Contingencies

The Company is involved in a number of legal and regulatory matters, principally environmental in nature, that are incidental to the normal conduct of its business, including lawsuits, investigations and claims. The outcome of these matters are inherently unpredictable. The Company believes that, in the aggregate, the outcome of all known legal and regulatory matters will not have a material adverse effect on its consolidated financial statements; however, specific outcomes with respect to such matters may be material to the Company's consolidated statements of operations in any particular period in which costs, if any, are recognized. The Company's assessment of the potential impact of environmental matters, in particular, is subject to uncertainty due to the complex, ongoing and evolving process of investigation and remediation of such environmental matters, and the potential for technological and regulatory developments. In addition, the impact of evolving claims and programs, such as natural resource damage claims, industrial site reuse initiatives and state remediation programs creates further uncertainty of the ultimate resolution of these matters. The Company anticipates that the resolution of many legal and regulatory matters, and in particular environmental matters, will occur over an extended period of time.

Environmental. As of September 30, 2016 and December 31, 2015, the Company had reserves for environmental contingencies totaling approximately $60,693 (primarily as a result of the Axiall acquisition) and $1,095, respectively, most of which was classified as noncurrent liabilities. The Company's assessment of the potential impact of these environmental contingencies is subject to considerable 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.

From time to time the Company receives 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 requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and the proceedings involve potential monetary sanctions, unless the Company reasonably believes such sanctions would not exceed $100.

• In May 2013, an amendment to an existing consent order agreed to by the West Virginia Department of Environmental Protection and a predecessor of Axiall required that it, among other things, pay a penalty in the amount of $449 and continue certain corrective action associated with discharges of hexachlorocyclohexane

26

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

(commonly referred to as BHC) from the Natrium, West Virginia facility's effluent discharge outfalls. The penalty was paid and corrective actions required under the amendment to the consent order are on-going.

• In May 2013 and September 2013, the Environmental Protection Agency (the "EPA") conducted inspections at the Company's Plaquemine, Louisiana facility pursuant to requirements of the federal Clean Air Act Section 112(r) Risk Management Program and Title V. As a result of the inspections, the EPA identified areas of concern and the Company has subsequently engaged in negotiations, which are anticipated to result in sanctions of $167.

• The LDEQ has issued notices of violations ("NOVs") regarding the Company's olefins facilities in Lake Charles, Louisiana for various air and water compliance issues. The Company is working with the LDEQ to settle these claims, and a global settlement of all claims is being discussed. The Company has reached a verbal agreement with the LDEQ to settle certain of the NOVs in two separate settlements for a combined $192 in civil penalties.

• During September 2010, the Company's vinyls facilities in north Lake Charles and Plaquemine each received a Consolidated Compliance Order and Notice of Potential Penalty, alleging violations of various requirements of those facilities' air permits, based largely on self-reported permit deviations related to record-keeping violations. The Company has been negotiating a possible global settlement of these and several other matters with the LDEQ. The Company believes the resolution of these matters may require the payment of a monetary sanction in excess of $100.

• In April 2015, Axiall received a communication from the EPA related to, among other things, the EPA's investigation of the 2012 and 2013 fires that occurred at its VCM plant in Lake Charles. In late 2015, Axiall settled this matter with the EPA, with such settlement including on-going supplemental environmental projects and a payment of $900.

• For several years, the EPA has been conducting an enforcement initiative against petroleum refineries and petrochemical plants with respect to emissions from flares. On April 21, 2014, the Company received a Clean Air Act Section 114 Information Request from the EPA which sought information regarding flares at the Calvert City, Kentucky and certain Lake Charles facilities. The EPA has informed the Company that the information provided leads the EPA to 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 would obligate the Company to take corrective actions relating to the alleged noncompliance. The Company believes the resolution of these matters may require the payment of a monetary sanction in excess of $100.

The Company does not believe that resolutions of any or all of these matters will have a material adverse effect on the Company's financial condition, results of operations or cash flows.

21. Segment Information

The Company operates in two principal operating segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Net external sales
Olefins
Polyethylene	$	380,810	$	423,631	$	1,098,500	$	1,283,545
Styrene, feedstock and other	116,555		164,466		324,369		508,507
Total Olefins	497,365		588,097		1,422,869		1,792,052
Vinyls
PVC, caustic soda and other	599,276		468,235		1,492,650		1,315,101
Building products	182,387		131,705		424,757		369,417
Total Vinyls	781,663		599,940		1,917,407		1,684,518
	$	1,279,028	$	1,188,037	$	3,340,276	$	3,476,570

27

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Intersegment sales
Olefins	$	30,614		$	28,551		$	85,856		$	78,654
Vinyls	2,130			341			2,719			1,098
	$	32,744		$	28,892		$	88,575		$	79,752
Income (loss) from operations
Olefins	$	118,475		$	196,703		$	408,274		$	608,744
Vinyls	22,235			67,779			136,559			202,831
Corporate and other	(94,147		)	(10,454		)	(116,056		)	(32,893		)
	$	46,563		$	254,028		$	428,777		$	778,682
Depreciation and amortization
Olefins	$	36,649		$	27,678		$	95,582		$	82,240
Vinyls	56,136			33,432			128,691			97,615
Corporate and other	1,444			138			2,920			374
	$	94,229		$	61,248		$	227,193		$	180,229
Other income (expense), net
Olefins	$	1,101		$	1,323		$	3,706		$	3,770
Vinyls	(1,226		)	10			1,722			6,927
Corporate and other	41,390			1,303			46,663			23,093
	$	41,265		$	2,636		$	52,091		$	33,790
Provision for (benefit from) income taxes
Olefins	$	31,956		$	45,865		$	136,429		$	186,534
Vinyls	(3,912		)	15,812			29,655			55,270
Corporate and other	(34,596		)	(1,644		)	(36,752		)	(4,980		)
	$	(6,552	)	$	60,033		$	129,332		$	236,824
Capital expenditures
Olefins	$	96,469		$	69,885		$	285,359		$	206,719
Vinyls	83,523			53,510			180,392			114,935
Corporate and other	178			1,909			1,579			7,582
	$	180,170		$	125,304		$	467,330		$	329,236

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Income from operations	$	46,563		$	254,028		$	428,777		$	778,682
Interest expense	(24,366		)	(8,211		)	(36,966		)	(26,760		)
Other income, net	41,265			2,636			52,091			33,790
Income before income taxes	$	63,462		$	248,453		$	443,902		$	785,712

28

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	September 30, 2016		December 31, 2015
Total assets
Olefins	$	2,094,163	$	1,869,888
Vinyls	8,262,971		2,638,833
Corporate and other	539,915		1,060,564
	$	10,897,049	$	5,569,285

22. Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

23. Guarantor Disclosures

The Company's payment obligations under the 3.60% senior notes due 2022 are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 3.60% senior notes due 2022 in excess of $5,000 (the "Guarantor Subsidiaries"). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation (the "100% Owned Guarantor Subsidiaries"). These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the 100% owned Guarantor Subsidiaries, and the remaining subsidiaries that do not guarantee the 3.60% senior notes due 2022 (the "Non-Guarantor Subsidiaries"), together with consolidating eliminations necessary to present the Company's results on a consolidated basis.

In August 2016, certain of the Company's subsidiary guarantors were released from their guarantees of the Company's 3.60% senior notes due 2022 in connection with the replacement of the Company's revolving credit facility. Westlake Chemical OpCo LP, which was previously separately presented as a less than 100% owned guarantor, and certain of the Company's other 100% owned subsidiaries that were previously presented as guarantors, are now reflected as Non-Guarantor Subsidiaries in the condensed consolidating guarantor financial information. Prior periods were retrospectively adjusted to conform to the current presentation of Guarantor Subsidiaries and Non-Guarantor Subsidiaries.

29

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information as of September 30, 2016

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	144,899	$	1,884	$	233,736	$	—		$	380,519
Accounts receivable, net	1,457		2,838,917		765,949		(2,535,822		)	1,070,501
Inventories	—		329,233		415,303		—			744,536
Prepaid expenses and other current assets	8,257		16,264		43,741		(13,394		)	54,868
Restricted cash	—		—		169,320		—			169,320
Total current assets	154,613		3,186,298		1,628,049		(2,549,216		)	2,419,744
Property, plant and equipment, net	—		1,538,148		4,912,799		—			6,450,947
Other assets, net	9,074,810		418,588		1,695,970		(9,163,010		)	2,026,358
Total assets	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049
Current liabilities
Accounts and notes payable	$	2,172,989	$	466,907	$	387,807	$	(2,524,315	)	$	503,388
Accrued liabilities	12,022		162,645		402,815		(24,901		)	552,581
Term loan	—		—		148,681		—			148,681
Total current liabilities	2,185,011		629,552		939,303		(2,549,216		)	1,204,650
Long-term debt, net	3,586,684		775,995		2,199,812		(2,881,906		)	3,680,585
Deferred income taxes	—		596,928		1,022,226		(12,070		)	1,607,084
Pension and other liabilities	—		48,837		531,756		—			580,593
Total liabilities	5,771,695		2,051,312		4,693,097		(5,443,192		)	7,072,912
Total Westlake Chemical Corporation stockholders' equity	3,457,728		3,091,722		3,177,312		(6,269,034		)	3,457,728
Noncontrolling interests	—		—		366,409		—			366,409
Total equity	3,457,728		3,091,722		3,543,721		(6,269,034		)	3,824,137
Total liabilities and equity	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049

30

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information as of December 31, 2015

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	303,131	$	6,818	$	352,576	$	—		$	662,525
Marketable securities	520,144		—		—		—			520,144
Accounts receivable, net	10,943		2,474,963		190,384		(2,167,758		)	508,532
Inventories	—		287,114		146,946		—			434,060
Prepaid expenses and other current assets	2,201		10,186		4,981		(2,879		)	14,489
Deferred income taxes	702		28,325		6,412		—			35,439
Total current assets	837,121		2,807,406		701,299		(2,170,637		)	2,175,189
Property, plant and equipment, net	—		1,476,642		1,527,425		—			3,004,067
Other assets, net	5,003,096		914,823		1,442,436		(6,970,326		)	390,029
Total assets	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285
Current liabilities
Accounts payable	$	1,817,963	$	374,468	$	185,931	$	(2,143,033	)	$	235,329
Accrued liabilities	9,117		163,167		142,633		(27,604		)	287,313
Total current liabilities	1,827,080		537,635		328,564		(2,170,637		)	522,642
Long-term debt, net	747,259		744,405		—		(733,516		)	758,148
Deferred income taxes	—		513,692		68,478		(6,567		)	575,603
Pension and other liabilities	—		49,202		101,759		—			150,961
Total liabilities	2,574,339		1,844,934		498,801		(2,910,720		)	2,007,354
Total Westlake Chemical Corporation stockholders' equity	3,265,878		3,353,937		2,876,306		(6,230,243		)	3,265,878
Noncontrolling interests	—		—		296,053		—			296,053
Total equity	3,265,878		3,353,937		3,172,359		(6,230,243		)	3,561,931
Total liabilities and equity	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285

31

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	775,474		$	823,238		$	(319,684	)	$	1,279,028
Cost of sales	—			677,085			714,365			(314,555		)	1,076,895
Gross profit	—			98,389			108,873			(5,129		)	202,133
Selling, general and administrative expenses	2,092			31,180			44,586			(5,129		)	72,729
Transaction and integration-related costs	—			35,379			47,462			—			82,841
(Loss) income from operations	(2,092		)	31,830			16,825			—			46,563
Interest expense	(22,130		)	(10,247		)	(9,117		)	17,128			(24,366		)
Other income (expense), net	35,405			(8,622		)	31,610			(17,128		)	41,265
Income before income taxes	11,183			12,961			39,318			—			63,462
(Benefit from) provision for income taxes	(2,088		)	18,987			(23,451		)	—			(6,552		)
Equity in net income of subsidiaries	52,391			—			—			(52,391		)	—
Net income (loss)	65,662			(6,026		)	62,769			(52,391		)	70,014
Net income attributable to noncontrolling interests	—			—			4,352			—			4,352
Net income (loss) attributable to Westlake Chemical Corporation	$	65,662		$	(6,026	)	$	58,417		$	(52,391	)	$	65,662
Comprehensive income (loss) attributable to Westlake Chemical Corporation	$	39,637		$	(5,923	)	$	45,945		$	(40,022	)	$	39,637

32

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	901,006		$	596,860	$	(309,829	)	$	1,188,037
Cost of sales	—			712,681			469,137		(305,057		)	876,761
Gross profit	—			188,325			127,723		(4,772		)	311,276
Selling, general and administrative expenses	804			37,156			24,060		(4,772		)	57,248
(Loss) income from operations	(804		)	151,169			103,663		—			254,028
Interest expense	(10,405		)	(5,711		)	—		7,905			(8,211		)
Other income, net	1,239			203			9,099		(7,905		)	2,636
(Loss) income before income taxes	(9,970		)	145,661			112,762		—			248,453
(Benefit from) provision for income taxes	(3,249		)	53,131			10,151		—			60,033
Equity in net income of subsidiaries	190,325			—			—		(190,325		)	—
Net income	183,604			92,530			102,611		(190,325		)	188,420
Net income attributable to noncontrolling interests	—			—			4,816		—			4,816
Net income attributable to Westlake Chemical Corporation	$	183,604		$	92,530		$	97,795	$	(190,325	)	$	183,604
Comprehensive income attributable to Westlake Chemical Corporation	$	181,663		$	92,781		$	96,062	$	(188,843	)	$	181,663

33

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,357,769		$	1,945,866		$	(963,359	)	$	3,340,276
Cost of sales	—			2,018,282			1,570,669			(947,759		)	2,641,192
Gross profit	—			339,487			375,197			(15,600		)	699,084
Selling, general and administrative expenses	3,648			104,488			87,221			(15,600		)	179,757
Transaction and integration-related costs	—			43,088			47,462			—			90,550
(Loss) income from operations	(3,648		)	191,911			240,514			—			428,777
Interest expense	(43,228		)	(19,051		)	(9,117		)	34,430			(36,966		)
Other income (expense), net	40,807			(12,057		)	57,771			(34,430		)	52,091
(Loss) income before income taxes	(6,069		)	160,803			289,168			—			443,902
(Benefit from) provision for income taxes	(8,268		)	136,856			744			—			129,332
Equity in net income of subsidiaries	297,715			—			—			(297,715		)	—
Net income	299,914			23,947			288,424			(297,715		)	314,570
Net income attributable to noncontrolling interests	—			—			14,656			—			14,656
Net income attributable to Westlake Chemical Corporation	$	299,914		$	23,947		$	273,768		$	(297,715	)	$	299,914
Comprehensive income attributable to Westlake Chemical Corporation	$	321,080		$	24,356		$	293,859		$	(318,215	)	$	321,080

34

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,677,773		$	1,727,561	$	(928,764	)	$	3,476,570
Cost of sales	—			2,078,730			1,362,710		(913,873		)	2,527,567
Gross profit	—			599,043			364,851		(14,891		)	949,003
Selling, general and administrative expenses	1,617			115,400			68,195		(14,891		)	170,321
(Loss) income from operations	(1,617		)	483,643			296,656		—			778,682
Interest expense	(31,726		)	(18,353		)	—		23,319			(26,760		)
Other income (expense), net	17,627			(4,743		)	44,225		(23,319		)	33,790
(Loss) income before income taxes	(15,716		)	460,547			340,881		—			785,712
(Benefit from) provision for income taxes	(5,226		)	222,743			19,307		—			236,824
Equity in net income of subsidiaries	545,531			—			—		(545,531		)	—
Net income	535,041			237,804			321,574		(545,531		)	548,888
Net income attributable to noncontrolling interests	—			—			13,847		—			13,847
Net income attributable to Westlake Chemical Corporation	$	535,041		$	237,804		$	307,727	$	(545,531	)	$	535,041
Comprehensive income attributable to Westlake Chemical Corporation	$	492,609		$	238,433		$	264,542	$	(502,975	)	$	492,609

35

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	299,914		$	23,947		$	288,424		$	(297,715	)	$	314,570
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	747			98,658			128,806			—			228,211
Deferred income taxes	(5,178		)	111,795			(707		)	—			105,910
Net changes in working capital and other	(314,423		)	93,280			(181,103		)	297,715			(104,531		)
Net cash (used for) provided by operating activities	(18,940		)	327,680			235,420			—			544,160
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			(2,437,829		)	—			(2,437,829		)
Additions to cost method investment	—			—			(4,000		)	—			(4,000		)
Additions to property, plant and equipment	—			(163,579		)	(303,751		)	—			(467,330		)
Proceeds from disposition of assets	—			48			165			—			213
Proceeds from sales and maturities of securities	658,338			—			4,600			—			662,938
Purchase of securities	(138,422		)	—			—			—			(138,422		)
Settlements of derivative instruments	—			(4,655		)	—			—			(4,655		)
Net cash provided by (used for) investing activities	519,916			(168,186		)	(2,740,815		)	—			(2,389,085		)
Cash flows from financing activities
Intercompany financing	(2,242,604		)	(366,639		)	2,609,243			—			—
Capitalized debt issuance costs	(33,617		)	—			(1,590		)	—			(35,207		)
Dividends paid	(71,933		)	—			—			—			(71,933		)
Distributions paid	—			202,211			(214,511		)	—			(12,300		)
Proceeds from debt issuance	1,428,512			—			—			—			1,428,512
Proceeds from exercise of stock options	1,650			—			—			—			1,650
Proceeds from issuance of notes payable	—			—			5,597			—			5,597
Proceeds from term loan and drawdown of revolver	450,000			—			150,000			—			600,000
Restricted cash associated with term loan	—			—			(154,000		)	—			(154,000		)

36

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations		Consolidated
Repayment of notes payable	—			—			(10,602		)	—		(10,602		)
Repayment of revolver	(125,000		)	—			—			—		(125,000		)
Repurchase of common stock for treasury	(67,406		)	—			—			—		(67,406		)
Windfall tax benefits from share-based payment arrangements	1,190			—			—			—		1,190
Net cash (used for) provided by financing activities	(659,208		)	(164,428		)	2,384,137			—		1,560,501
Effect of exchange rate changes on cash and cash equivalents	—			—			2,418			—		2,418
Net decrease in cash and cash equivalents	(158,232		)	(4,934		)	(118,840		)	—		(282,006		)
Cash and cash equivalents at beginning of period	303,131			6,818			352,576			—		662,525
Cash and cash equivalents at end of period	$	144,899		$	1,884		$	233,736		$	—	$	380,519

37

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	535,041		$	237,804		$	321,574		$	(545,531	)	$	548,888
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	1,504			81,770			98,459			—			181,733
Deferred income taxes	87			3,972			3,526			—			7,585
Net changes in working capital and other	(567,137		)	110,574			14,126			545,531			103,094
Net cash (used for) provided by operating activities	(30,505		)	434,120			437,685			—			841,300
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(137,844		)	(191,392		)	—			(329,236		)
Proceeds from disposition of assets	—			—			17			—			17
Proceeds from disposition of equity method investment	—			27,865			—			—			27,865
Proceeds from sales and maturities of securities	16,056			—			—			—			16,056
Purchase of securities	(282,542		)	—			—			—			(282,542		)
Settlements of derivative instruments	—			(1,535		)	—			—			(1,535		)
Net cash used for investing activities	(266,486		)	(111,514		)	(175,593		)	—			(553,593		)
Cash flows from financing activities
Intercompany financing	467,360			(570,217		)	102,857			—			—
Dividends paid	(67,852		)	—			—			—			(67,852		)
Distributions paid	—			249,999			(260,981		)	—			(10,982		)
Proceeds from exercise of stock options	984			—			—			—			984
Proceeds from issuance of notes payable	—			—			19,483			—			19,483
Repayment of notes payable	—			—			(32,954		)	—			(32,954		)
Repurchase of common stock for treasury	(114,254		)	—			—			—			(114,254		)
Windfall tax benefits from share-based payment arrangements	2,452			—			—			—			2,452
Net cash provided by (used for) financing activities	288,690			(320,218		)	(171,595		)	—			(203,123		)

38

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations		Consolidated
Effect of exchange rate changes on cash and cash equivalents	—			—		(3,260		)	—		(3,260		)
Net (decrease) increase in cash and cash equivalents	(8,301		)	2,388		87,237			—		81,324
Cash and cash equivalents at beginning of period	655,947			3,047		221,607			—		880,601
Cash and cash equivalents at end of period	$	647,646		$	5,435	$	308,844		$	—	$	961,925

39

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

This discussion and analysis should be read in conjunction with information contained in the accompanying unaudited consolidated interim financial statements of Westlake Chemical Corporation and the notes thereto and the consolidated financial statements and notes thereto of Westlake Chemical Corporation included in Westlake Chemical Corporation's Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (the "2015 Form 10-K"). The following discussion contains forward-looking statements. Please read "Forward-Looking Statements" for a discussion of limitations inherent in such statements.

We are a vertically integrated global manufacturer and marketer of basic chemicals, vinyls, polymers and building products. Our two principal operating segments are Olefins and Vinyls. We are highly integrated along our olefins product chain with significant downstream integration into polyethylene and styrene monomer. We are also an integrated global producer of vinyls with substantial downstream integration into polyvinyl chloride ("PVC") building products.

Since 2009 and continuing through the third quarter of 2016, a cost advantage for ethane-based ethylene producers over naphtha-based ethylene producers has allowed a strong export market for polyethylene, ethylene derivatives and higher margins for North American chemical producers, including Westlake. Continued strong global demand for polyethylene has resulted in improved operating margins and cash flow for our Olefins segment in recent years. However, we have seen a significant reduction in the cost advantage enjoyed by North American ethane-based ethylene producers due to lower crude oil prices, beginning in the third quarter of 2014 and continuing through the third quarter of 2016. Falling crude oil prices have resulted in reduced prices and margins and may continue to do so. However, our European operations rely primarily on feedstock derived from naphtha-based ethylene crackers and may benefit from lower crude oil prices. Looking forward, new olefins capacity additions in Asia, the Middle East and North America, a number of which have been announced in recent years, may lead to periods of over-supply and lower profitability.

Continued slow recovery in the U.S. construction markets and budgetary constraints in municipal spending have contributed to lower North American demand for our vinyls products, which may continue to negatively impact our Vinyls segment operating rates and margins. Likewise, European industry production capacities currently exceed demand in the region, largely due to the weak economic environment in Europe. However, since late 2010, the PVC industry in North America has experienced an increase in PVC resin export demand, driven largely by more competitive feedstock and energy cost positions in North America. As a consequence, North American PVC resin industry operating rates have improved since 2010, largely due to higher PVC resin export shipments. In addition, the completion of our world-scale Geismar, Louisiana chlor-alkali plant and the ethane feedstock conversion and ethylene expansion project at Westlake Chemical OpCo LP's ("OpCo") Calvert City, Kentucky ethylene plant in 2013 and 2014, respectively, as well as the July 2014 acquisition of Vinnolit Holdings GmbH and its subsidiary companies ("Vinnolit"), an integrated global leader in specialty PVC resins, have contributed to improved operating margins and cash flow for our Vinyls segment.

The economic environment in the United States and globally appears to be slowly improving. However, depending on the performance of the global economy in the remainder of 2016 and beyond, our financial condition, results of operations or cash flows could be negatively impacted. In addition, the European economy has been slower to recover than the U.S. economy.

Recent Developments

On August 31, 2016, we completed the previously announced acquisition of Axiall Corporation ("Axiall") for $33.00 per share in an all-cash transaction (the "Merger"), pursuant to the terms of the previously announced Agreement and Plan of Merger (the "Merger Agreement"), dated as of June 10, 2016, by and among Westlake, Axiall and Lagoon Merger Sub, Inc., a wholly-owned subsidiary of Westlake. The combined company is the third-largest global chlor-alkali producer and the third-largest global PVC producer. During the third quarter of 2016, in order to finance a portion of the consideration and related fees and expenses, and for other general corporate purposes, we issued $1.45 billion aggregate principal amount of senior notes. In addition, we entered into a $1.0 billion unsecured revolving credit facility (the "Credit Agreement").

In July 2016, OpCo completed planned major maintenance activities, or a turnaround, of its Petro 1 ethylene unit at our Lake Charles, Louisiana site. In conjunction with this turnaround, OpCo also completed an upgrade and capacity expansion of the Petro 1 ethylene unit. The Petro 1 expansion project is expected to increase ethylene capacity by approximately 250 million pounds annually. Income from operations for the third quarter of 2016 was negatively impacted as a result of the lost production, unabsorbed fixed manufacturing costs and other costs related to the planned turnaround and expansion.

On July 18, 2016, we announced that our Calvert City facility was in the process of restarting as a result of an unexpected shut down that occurred on June 1, 2016. The unplanned outage was caused by a mechanical failure of OpCo's ethylene unit, which resulted in a complete outage of the facility and halted all production including the production of ethylene dichloride ("EDC"), vinyl chloride monomer ("VCM"), chlor-alkali and PVC resin. Income from operations for the third quarter of 2016

40

was negatively impacted as a result of the lost production, unabsorbed fixed manufacturing costs and other costs related to the unplanned outage.

Results of Operations

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
	(dollars in thousands, except per share data)
Net external sales
Olefins
Polyethylene	$	380,810		$	423,631		$	1,098,500		$	1,283,545
Styrene, feedstock and other	116,555			164,466			324,369			508,507
Total Olefins	497,365			588,097			1,422,869			1,792,052
Vinyls
PVC, caustic soda and other	599,276			468,235			1,492,650			1,315,101
Building products	182,387			131,705			424,757			369,417
Total Vinyls	781,663			599,940			1,917,407			1,684,518
Total	$	1,279,028		$	1,188,037		$	3,340,276		$	3,476,570
Income (loss) from operations
Olefins	$	118,475		$	196,703		$	408,274		$	608,744
Vinyls	22,235			67,779			136,559			202,831
Corporate and other	(94,147		)	(10,454		)	(116,056		)	(32,893		)
Total income from operations	46,563			254,028			428,777			778,682
Interest expense	(24,366		)	(8,211		)	(36,966		)	(26,760		)
Other income, net	41,265			2,636			52,091			33,790
(Benefit from) provision for income taxes	(6,552		)	60,033			129,332			236,824
Net income	70,014			188,420			314,570			548,888
Net income attributable to noncontrolling interests	4,352			4,816			14,656			13,847
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Diluted earnings per share	$	0.51		$	1.39		$	2.29		$	4.02
EBITDA (1)	$	182,057		$	317,912		$	708,061		$	992,701

_____________

(1) See "Reconciliation of EBITDA to Net Income and to Net Cash Provided by Operating Activities" below.

	Three Months Ended September 30, 2016				Nine Months Ended September 30, 2016
	Average Sales Price		Volume		Average Sales Price		Volume
Product sales price and volume percentage change    from prior-year period
Olefins	-6.3	%	-9.1	%	-12.0	%	-8.6	%
Vinyls	-3.0	%	+33.3	%	-5.7	%	+19.5	%
Company average	-4.6	%	+12.3	%	-8.9	%	+5.0	%

41

	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2015	2016	2015
Average industry prices (1)
Ethane (cents/lb)	6.3	6.4	6.2	6.3
Propane (cents/lb)	11.2	9.6	10.7	11.0
Ethylene (cents/lb) (2)	32.5	28.2	26.5	33.6
Polyethylene (cents/lb) (3)	68.7	72.3	65.3	73.8
Styrene (cents/lb) (4)	66.8	64.2	63.3	61.4
Caustic soda ($/short ton) (5)	660.8	563.3	618.3	576.1
Chlorine ($/short ton) (6)	304.2	275.0	295.3	260.8
PVC (cents/lb) (7)	71.5	66.5	68.8	66.5

_____________

(1) Industry pricing data was obtained from IHS Chemical. We have not independently verified the data.

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

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

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

(5) Represents average North American undiscounted contract prices of caustic soda over the period as reported by IHS Chemical.

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

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

Reconciliation of EBITDA to Net Income and to Net Cash Provided by Operating Activities

The following table presents the reconciliation of EBITDA to net income and to net cash provided by operating activities, the most directly comparable GAAP financial measures, for each of the periods indicated.

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016			2015		2016		2015
	(dollars in thousands)
EBITDA	$	182,057		$	317,912	$	708,061	$	992,701
Less:
(Benefit from) provision for income taxes	(6,552		)	60,033		129,332		236,824
Interest expense	24,366			8,211		36,966		26,760
Depreciation and amortization	94,229			61,248		227,193		180,229
Net income	70,014			188,420		314,570		548,888
Changes in operating assets and liabilities and other	101,334			213,028		123,680		284,827
Deferred income taxes	2,920			4,497		105,910		7,585
Net cash provided by operating activities	$	174,268		$	405,945	$	544,160	$	841,300

42

Summary

For the quarter ended September 30, 2016, net income attributable to Westlake Chemical Corporation was $65.7 million, or $0.51 per diluted share, on net sales of $1,279.0 million. This represents a decrease in net income attributable to Westlake Chemical Corporation of $117.9 million, or $0.88 per diluted share, compared to the quarter ended September 30, 2015 net income attributable to Westlake Chemical Corporation of $183.6 million, or $1.39 per diluted share, on net sales of $1,188.0 million. Net income for the third quarter of 2016 was impacted by (1) pre-tax transaction and integration-related costs of approximately $82.8 million, or $0.41 per diluted share, associated with the Merger; (2) pre-tax unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, an unplanned outage at our Calvert City facility and other planned turnarounds totaling approximately $36.0 million, or $0.18 per diluted share; and (3) lost sales associated with such turnarounds and outages, partially offset by (4) realized gain of approximately $49.1 million from the previously held outstanding shares of common stock of Axiall; and (5) a third quarter 2016 effective tax rate of (10.3)%. The third quarter 2016 rate resulted from discrete items totaling $28.6 million, which decreased the third quarter 2016 tax provision, and are comprised of $17.2 million related to the non-recognition of tax on the gain recognized attributable to previously held outstanding shares of common stock of Axiall and $15.6 million related to return to provision, amended returns and other adjustments, partially offset by $4.2 million related to non-deductible Axiall acquisition costs. We estimate the 2016 annual tax rate on ordinary income will be approximately 35.6%. Net sales for the third quarter of 2016increased by $91.0 million compared to net sales for the third quarter of 2015, mainly due to sales contributed by Axiall, partially offset by lower sales prices and lower sales volumes for most of our major products. Income from operations was $46.6 million for the third quarter of 2016 as compared to $254.0 million for the third quarter of 2015. The decrease in income from operations for the third quarter of 2016 was mainly a result of lower sales prices for most of our major products, transaction and integration-related costs associated with the Merger and the effect of selling higher cost Axiall inventory recorded at fair value. In addition, income from operations for the third quarter of 2016 was negatively impacted by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, the unplanned outage at our Calvert City facility and other planned turnarounds.

For the nine months ended September 30, 2016, net income attributable to Westlake Chemical Corporation was $299.9 million, or $2.29 per diluted share, on net sales of $3,340.3 million. This represents a decrease in net income attributable to Westlake Chemical Corporation of $235.1 million, or $1.73 per diluted share, from the nine months ended September 30, 2015 net income attributable to Westlake Chemical Corporation of $535.0 million, or $4.02 per diluted share, on net sales of $3,476.6 million. Net income for the nine months ended September 30, 2016 was impacted by (1) pre-tax transaction and integration-related costs of approximately $90.6 million, or $0.45 per diluted share, associated with the Merger; (2) pre-tax unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, an unplanned outage at our Calvert City facility and other planned turnarounds and unplanned outages totaling approximately $116.2 million, or $0.58 per diluted share; and (3) lost sales associated with such turnarounds and outages, partially offset by (4) realized gain of approximately $49.1 million from the previously held outstanding shares of common stock of Axiall; and (5) a lower effective tax rate of 29.1%. The 2016 period rate resulted from discrete items totaling $29.0 million, which decreased the tax provision for the 2016 period, and are comprised of $17.2 million related to the non-recognition of tax on the gain recognized attributable to the previously held outstanding shares of common stock of Axiall and $16.0 million related to return to provision, amended returns and other adjustments, partially offset by $4.2 million related to non-deductible Axiall acquisition costs. Net sales for the nine months ended September 30, 2016decreased by $136.3 million compared to the prior-year period, primarily due to lower sales prices for all our major products and lower sales volumes for ethylene, polyethylene and ethylene co-products, partially offset by higher sales volume for PVC resin and sales contributed by Axiall and Suzhou Huasu Plastics Co., Ltd. ("Huasu"). We acquired a controlling interest in Huasu in June 2015. Income from operations was $428.8 million for the nine months ended September 30, 2016 as compared to $778.7 million for the nine months ended September 30, 2015, a decrease mainly attributable to lower sales prices for all our major products, transaction and integration-related costs associated with the Merger and the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, the unplanned outage at our Calvert City facility and other planned turnarounds and unplanned outages. The decrease in income from operations for the nine months ended September 30, 2016 was partially offset by lower average feedstock and energy costs and higher product margins at our European operations, as compared to the prior-year period.

RESULTS OF OPERATIONS

Third Quarter 2016 Compared with Third Quarter 2015

Net Sales. Net sales increased by $91.0 million, or 7.7%, to $1,279.0 million in the third quarter of 2016 from $1,188.0 million in the third quarter of 2015, primarily attributable to sales contributed by Axiall, partially offset by lower sales prices and lower sales volumes for most of our major products. Average sales prices for the third quarter of 2016decreased by 4.6%

43

as compared to the third quarter of 2015. Overall sales volumes increased by 12.3% as compared to the third quarter of 2015, primarily attributable to sales contributed by Axiall, as compared to the prior-year period.

Gross Profit. Gross profit margin percentage decreased to 15.8% in the third quarter of 2016 from 26.2% in the third quarter of 2015. The third quarter 2016 gross profit was negatively impacted by lower sales prices for most of our major products. Sales prices decreased an average of 4.6% for the third quarter of 2016 as compared to the third quarter of 2015. In addition, the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, the unplanned outage at our Calvert City facility and other planned turnarounds further contributed to the decrease in third quarter 2016 gross profit margin. The decrease in third quarter 2016 gross profit margin was compounded by the negative impact of selling higher cost Axiall inventory recorded at fair value.

Selling, General and Administrative Expenses. Selling, general and administrative expenses increased by $15.5 million to $72.7 million in the third quarter of 2016 as compared to $57.2 million in the third quarter of 2015. This increase was mainly due to general and administrative costs incurred by Axiall for the period from August 31, 2016 to September 30, 2016, partially offset by lower consulting and professional fees and lower payroll and related labor costs, including incentive compensation, as compared to the prior-year period.

Transaction and Integration-related Costs. Transaction and integration-related costs were $82.8 million in the third quarter of 2016 and primarily consisted of severance benefits provided to former Axiall executives in conjunction with the Merger, including the conversion of Axiall restricted stock units into our restricted stock units, transitional service expenses for certain former Axiall employees, retention agreement costs and consulting and professional fees related to the Merger.

Interest Expense. Interest expense increased by $16.2 million to $24.4 million in the third quarter of 2016 from $8.2 million in the third quarter of 2015 largely as a result of higher average debt outstanding for the period. See "Liquidity and Capital Resources—Debt" below for further discussion on our indebtedness.

Other Income, Net. Other income, net increased by $38.7 million to $41.3 million in the third quarter of 2016 from $2.6 million in the third quarter of 2015. The increase was primarily attributable to the realized gain of approximately $49.1 million from the previously held outstanding shares of common stock of Axiall, partially offset by the bridge loan facility fees written off during the third quarter of 2016 and other financing costs in connection with the Merger.

Income Taxes. The effective income tax rate was (10.3)% for the third quarter of 2016. The effective income tax rate for the third quarter of 2016 was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 24.2% for the third quarter of 2015. The effective income tax rate for the third quarter of 2015 was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the foreign earnings rate differential, the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed, partially offset by state income taxes.

Olefins Segment

Net Sales. Net sales for the Olefins segment decreased by $90.7 million, or 15.4%, to $497.4 million in the third quarter of 2016 from $588.1 million in the third quarter of 2015, primarily due to lower sales prices and lower sales volumes for our major products, as compared to the prior-year period. Average sales prices for the Olefins segment decreased by 6.3% in the third quarter of 2016 as compared to the third quarter of 2015. Average sales volumes for the Olefins segment decreased by 9.1% in the third quarter of 2016 as compared to the third quarter of 2015.

Income from Operations. Income from operations for the Olefins segment decreased by $78.2 million to $118.5 million in the third quarter of 2016 from $196.7 million in the third quarter of 2015. This decrease was mainly attributable to lower olefins integrated product margins, primarily due to lower sales prices as compared to the prior-year period, and the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs related to the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit and other planned turnarounds during the third quarter of 2016. Trading activity in the third quarter of 2016 resulted in a loss of $7.8 million as compared to a loss of $9.3 million in the third quarter of 2015.

44

Vinyls Segment

Net Sales. Net sales for the Vinyls segment increased by $181.8 million, or 30.3%, to $781.7 million in the third quarter of 2016 from $599.9 million in the third quarter of 2015. This increase was mainly attributable to sales contributed by Axiall, partially offset by lower sales prices for our building products and lower sales volumes for all of our major products, as compared to the prior-year period. Average sales prices for the Vinyls segment decreased by 3.0% in the third quarter of 2016 as compared to the third quarter of 2015. Average sales volumes for the Vinyls segment increased by 33.3% in the third quarter of 2016 as compared to the third quarter of 2015, primarily attributable to sales contributed by Axiall, as compared to the prior-year period.

Income from Operations. Income from operations for the Vinyls segment decreased by $45.6 million to $22.2 million in the third quarter of 2016 from $67.8 million in the third quarter of 2015. This decrease was mainly caused by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the unplanned outage at our Calvert City facility and other planned turnarounds at our European facilities and lower sales prices for our building products, as compared to the prior-year period. In addition, income from operations for the third quarter of 2016 was negatively impacted by the effect of selling higher cost Axiall inventory recorded at fair value.

Nine Months Ended September 30, 2016 Compared with Nine Months Ended September 30, 2015

Net Sales. Net sales decreased by $136.3 million, or 3.9%, to $3,340.3 million for the nine months ended September 30, 2016 from $3,476.6 million for the nine months ended September 30, 2015, primarily attributable to lower sales prices for all our major products and lower sales volumes for ethylene, polyethylene and ethylene co-products, partially offset by higher sales volume for PVC resin and sales contributed by Axiall and Huasu, as compared to the prior-year period. Average sales prices for the nine months ended September 30, 2016decreased by 8.9% as compared to the nine months ended September 30, 2015. Sales prices in the first nine months of 2016 were negatively impacted by lower crude oil prices as compared to the prior-year period. Overall sales volumes for the nine months ended September 30, 2016increased by 5.0% as compared to the nine months ended September 30, 2015, primarily attributable to sales contributed by Axiall and Huasu, as compared to the prior-year period.

Gross Profit. Gross profit margin percentage of 20.9% for the nine months ended September 30, 2016decreased from the 27.3% gross profit margin percentage for the nine months ended September 30, 2015. The decrease was mainly attributable to lower sales prices for our major products, as compared to the prior-year period, and the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, the unplanned outage at our Calvert City facility and other planned turnarounds and unplanned outages during the first nine months of 2016. Sales prices decreased an average of 8.9% for the nine months ended September 30, 2016 as compared to the prior-year period. In addition, gross profit for the nine months ended September 30, 2016 included the negative impact of selling higher cost Axiall inventory recorded at fair value. The decrease in gross profit for the nine months ended September 30, 2016 was partially offset by lower average feedstock and energy costs and higher product margins at our European operations, as compared to the prior-year period.

Selling, General and Administrative Expenses. Selling, general and administrative expenses increased by $9.5 million to $179.8 million for the nine months ended September 30, 2016 as compared to $170.3 million for the nine months ended September 30, 2015. This increase was mainly attributable to general and administrative costs incurred by Axiall for the period from August 31, 2016 to September 30, 2016, partially offset by lower consulting and professional fees, as compared to the prior-year period.

Transaction and Integration-related Costs. Transaction and integration-related costs were $90.6 million in the nine months ended September 30, 2016 and primarily consisted of severance benefits provided to former Axiall executives in conjunction with the Merger, including the conversion of Axiall restricted stock units into our restricted stock units, transitional service expenses for former Axiall employees, retention agreement costs and consulting and professional fees related to the Merger.

Interest Expense. Interest expense increased by $10.2 million to $37.0 million for the nine months ended September 30, 2016, largely as a result of higher average debt outstanding for the period, partially offset by increased capitalized interest on major capital projects as compared to the prior-year period. See "Liquidity and Capital Resources—Debt" below for a further discussion of our indebtedness.

Other Income, Net. Other income, net increased by $18.3 million to $52.1 million for the nine months ended September 30, 2016 from $33.8 million for the nine months ended September 30, 2015. The increase was primarily attributable to the realized gain of approximately $49.1 million from the previously held outstanding shares of common stock of Axiall and higher interest income for the nine months ended September 30, 2016 as compared to the prior-year period, partially offset by the

45

expenses related to the bridge loan facility and other financing costs in connection with the Merger. Other income, net for the nine months ended September 30, 2015 included a gain of approximately $15.5 million related to the bargain purchase gain from the acquisition of a controlling interest in Huasu, net of related expenses, and the partial impairment of an equity method investment.

Income Taxes. The effective income tax rate was 29.1% for the nine months ended September 30, 2016. The effective income tax rate for the 2016 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 30.1% for the nine months ended September 30, 2015. The effective income tax rate for the 2015 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the non-recognition of tax related to the bargain purchase of a controlling interest in Huasu, the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes.

Olefins Segment

Net Sales. Net sales decreased by $369.2 million, or 20.6%, to $1,422.9 million for the nine months ended September 30, 2016 from $1,792.1 million for the nine months ended September 30, 2015, mainly due to lower sales prices for our major products and lower sales volumes for most of our major products, as compared to the prior-year period. Average sales prices for the Olefins segment decreased by 12.0% for the nine months ended September 30, 2016 as compared to the nine months ended September 30, 2015. Average sales volumes for the Olefins segment decreased by 8.6% for the nine months ended September 30, 2016 as compared to the nine months ended September 30, 2015.

Income from Operations. Income from operations decreased by $200.4 million to $408.3 million for the nine months ended September 30, 2016 from $608.7 million for the nine months ended September 30, 2015. This decrease was mainly attributable to lower olefins integrated product margins, primarily as a result of lower sales prices as compared to the prior-year period, and the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs related to the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit and other planned turnarounds and unplanned outages during the first nine months of 2016. Trading activity for the nine months ended September 30, 2016 resulted in a gain of $7.8 million as compared to a loss of $4.5 million for the prior-year period.

Vinyls Segment

Net Sales. Net sales increased by $232.9 million, or 13.8%, to $1,917.4 million for the nine months ended September 30, 2016 from $1,684.5 million for the nine months ended September 30, 2015. This increase was primarily attributable to sales contributed by Axiall and Huasu and higher sales volume for PVC resin, partially offset by lower sales prices for our major products. Average sales prices for the Vinyls segment decreased by 5.7% for the nine months ended September 30, 2016 as compared to the nine months ended September 30, 2015. Average sales volumes for the Vinyls segment increased by 19.5% for the nine months ended September 30, 2016 as compared to the nine months ended September 30, 2015, primarily attributable to sales contributed by Axiall and Huasu, as compared to the prior-year period.

Income from Operations. Income from operations decreased by $66.2 million to $136.6 million for the nine months ended September 30, 2016 from $202.8 million for the nine months ended September 30, 2015. This decrease was mainly caused by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the unplanned outage at our Calvert City facility and other planned turnarounds during the first nine months of 2016. Income from operations for the nine months ended September 30, 2016 was also lower as a result of lower sales prices for our major products, partially offset by higher product margins at our European operations, as compared to the prior-year period. In addition, income from operations for the nine months ended September 30, 2016 included the negative impact of selling higher cost Axiall inventory recorded at fair value.

CASH FLOW DISCUSSION FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2016 AND 2015

Cash Flows

Operating Activities

Operating activities provided cash of $544.2 million in the first nine months of 2016 compared to cash provided by operating activities of $841.3 million in the first nine months of 2015. The $297.1 milliondecrease in cash flows from

46

operating activities was mainly due to a decrease in income from operations, an increase in working capital requirements and an increase in deferred turnaround costs associated with OpCo's Lake Charles Petro 1 turnaround, partially offset by lower income taxes paid, as compared to the prior-year period. Income from operations decreased by $349.9 million in the first nine months of 2016, as compared to the prior-year period, mostly attributable to (1) lower sales prices for all our major products; (2) transaction and integration-related costs associated with the Merger; and (3) the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of OpCo's Lake Charles Petro 1 ethylene unit, the unplanned outage at our Calvert City facility and other planned turnarounds and unplanned outages. Changes in components of working capital, which we define for purposes of this cash flow discussion as accounts receivable, net, inventories, prepaid expenses and other current assets, less accounts payable and accrued liabilities, provided cash of $10.5 million in the first nine months of 2016, compared to $113.9 million of cash provided in the first nine months of 2015, an unfavorable change of $103.4 million. The change was mainly due to an increase of $147.2 million in accounts receivable and an increase of $112.0 million in inventory, partially offset by a decrease in accounts payable and accrued liabilities of $148.7 million.

Investing Activities

Net cash used for investing activities during the first nine months of 2016 was $2,389.1 million as compared to net cash used for investing activities of $553.6 million in the first nine months of 2015. We used $2,437.8 million, net of cash acquired, for the acquisition of Axiall. Capital expenditures were $467.3 million in the first nine months of 2016 compared to $329.2 million in the first nine months of 2015. Capital expenditures in the first nine months of 2016 were primarily incurred on the upgrade and expansion of OpCo's Petro 1 ethylene unit at our Lake Charles site and OpCo's Calvert City ethylene plant at our Calvert City site. Capital expenditures in the first nine months of 2015 were primarily incurred on the upgrade and expansion of OpCo's Petro 1 ethylene unit at our Lake Charles site. The remaining capital expenditures in the first nine months of 2016 and 2015 primarily related to projects to improve production capacity or reduce costs, maintenance and safety projects and environmental projects at our various facilities. Purchases of securities in the first nine months of 2016 totaled $138.4 million and were comprised of corporate debt securities, U.S. government debt securities and equity securities. We also received aggregate proceeds of $662.9 million from the sales and maturities of our investments in the first nine months of 2016. The activity during the first nine months of 2015 was primarily related to the purchases of securities and the receipt of proceeds from the sales and maturities of our investments. In addition, we acquired cash of $15.8 million, net of cash paid, in connection with the acquisition of a controlling interest in Huasu.

Financing Activities

Net cash provided for financing activities during the first nine months of 2016 was $1,560.5 million as compared to net cash used for financing activities of $203.1 million in the first nine months of 2015. Net proceeds from the issuance of our senior notes and the proceeds from our term loan and the drawdown of the Credit Agreement were $1,428.5 million and $600.0 million, respectively, partially offset by the $125.0 million partial repayment of the Credit Agreement in the first nine months of 2016. The remaining activity during the first nine months of 2016 was primarily related to the $71.9 million payment of cash dividends, the $12.3 million payment of cash distributions to noncontrolling interests, the $35.2 million payment of debt issuance costs and the $67.4 million of cash used for repurchases of shares of our common stock. In addition, we repaid $10.6 million of Huasu's short-term notes payable to banks in connection with the payment of suppliers through letters of credit, partially offset by $5.6 million of proceeds from the issuance of such notes payable. The financing activities during the first nine months of 2015 were mainly related to the payment of cash dividends, the payment of cash distributions to noncontrolling interests, the proceeds from and the repayments of Huasu's short-term notes payable to banks and the repurchase of shares of our common stock.

LIQUIDITY AND CAPITAL RESOURCES

Liquidity and Financing Arrangements

Our 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 January 2016, OpCo announced an expansion project to increase the ethylene capacity of its ethylene plant at our Calvert City facility. The expansion is expected to increase ethylene capacity by approximately 70 million pounds annually and is targeted for completion during the first half of 2017. Combined with other incremental capacity increases, the total ethylene capacity of OpCo's ethylene plant at our Calvert City facility is expected to increase to 730 million pounds annually at the completion of this project. This capital project is currently estimated to cost in the range of $70.0 million to $80.0 million and is expected to be funded with cash on hand, cash flow from operations, and, if necessary, borrowings under each of the Credit Agreement and OpCo's revolving credit facility with another subsidiary of ours and other external financing. As of

47

September 30, 2016, OpCo had incurred a total cost of approximately $30.5 million on the Calvert City ethylene expansion capital project.

In November 2014, our Board of Directors authorized a $250.0 million share repurchase program (the "2014 Program"). In November 2015, our Board of Directors approved the expansion of the 2014 Program by an additional $150.0 million. During the three months ended September 30, 2016, no shares of our common stock were repurchased under the 2014 Program. As of September 30, 2016, we had repurchased 4,193,598 shares of our common stock for an aggregate purchase price of approximately $228.7 million 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.

We believe that our sources of liquidity as described above will be adequate to fund our normal operations and ongoing capital expenditures. Funding of any potential large expansions or any potential acquisitions would likely necessitate and therefore depend on our ability to obtain additional financing in the future. We may not be able to access additional liquidity at cost effective interest rates due to the volatility of the commercial credit markets.

Cash and Cash Equivalents

As of September 30, 2016, our cash and cash equivalents totaled $380.5 million. In addition, we have the Credit Agreement available to supplement cash if needed, as described under "Debt" below.

Debt

As of September 30, 2016, our indebtedness, including current maturities, totaled $3.8 billion, consisting of $100.0 million of 6 ½% senior notes due 2029, $250.0 million of 6 ¾% senior notes due 2032, $89.0 million of 6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes"), $65.0 million of 6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes") (collectively, the "Senior Notes"), $624.8 million aggregate principal amount of 4.625% senior notes due 2021 (the "4.625% Westlake 2021 Senior Notes"), $63.2 million aggregate principal amount of the 4.625% senior notes due 2021 (the "4.625% Subsidiary 2021 Senior Notes"), $250.0 million principal amount of 3.60% senior notes due 2022, $433.8 million aggregate principal amount of 4.875% senior notes due 2023 (the "4.875% Westlake 2023 Senior Notes"), $16.2 million aggregate principal amount of the 4.875% senior notes due 2023 (the "4.875% Subsidiary 2023 Senior Notes"), $750.0 million aggregate principal amount of 3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes"), $700.0 million aggregate principal amount of 5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes"), $325.0 million borrowings outstanding under the Credit Agreement, a $10.9 million loan from the proceeds of tax-exempt waste disposal revenue bonds (supported by an $11.3 million letter of credit) and a $150.0 million current term loan facility, plus unamortized premium net of unamortized discount and debt issuance costs of $1.4 million. The 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% 2035 GO Zone Senior Notes and the 6 ½% 2035 IKE Zone Senior Notes evidence and secure our obligations to the Louisiana Local Government Environmental Facility and Development Authority (the "Authority"), a political subdivision of the State of Louisiana, under four loan agreements relating to the issuance of $100.0 million, $250.0 million, $89.0 million and $65.0 million aggregate principal amount of the Authority's tax-exempt revenue bonds, respectively. As of September 30, 2016, debt outstanding under the Credit Agreement, tax-exempt waste disposal revenue bonds and the term loan facility bore interest at a variable rate. As of September 30, 2016, we were in compliance with all of the covenants with respect to the Senior Notes, the 4.625% Westlake 2021 Senior Notes, the 4.625% Subsidiary 2021 Senior Notes, the 3.60% senior notes due 2022, the 4.875% Westlake 2023 Senior Notes, the 4.875% Subsidiary 2023 Senior Notes, the 3.60% 2026 Senior Notes, the 5.0% 2046 Senior Notes, the Credit Agreement, our waste disposal revenue bonds and our term loan facility.

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 is subject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control. Based on our current level of operations and unless we were to undertake a new expansion or large acquisition, we believe our cash flow from operations, available cash and available borrowings under the Credit Agreement will be adequate to meet our normal operating needs for the foreseeable future.

Term Loan

On August 10, 2016, our indirect subsidiary, Westlake International Holdings II C.V., a limited partnership organized under the laws of the Netherlands (the "CV Borrower"), entered into a credit agreement with Bank of America, N.A., as agent and lender, providing the CV Borrower with a $150.0 million term loan facility. The term loan facility matures on March 31, 2017. The loans thereunder bear interest at a floating interest rate equal to LIBOR plus 2.0% per annum, payable in arrears on the last day of each three-month period following the date of funding and at maturity. The CV Borrower may elect to convert the interest rate to a base rate with a 1.0% spread.

48

The facility contains customary covenants and events of default that impose certain operating and financial restrictions on the CV Borrower and certain of its subsidiaries. These restrictions, among other things, provide limitations on the incurrence of additional indebtedness and liens and the ability to engage in certain transactions with affiliates.

Pursuant to the credit agreement, all of our non-U.S. subsidiaries are to remain owned, directly or indirectly, by the CV Borrower and its wholly owned subsidiary, Westlake International II LLC, a Delaware limited liability company ("WII LLC"). The CV Borrower is also required, together with its subsidiaries, to maintain at all times unencumbered cash and cash equivalents in a U.S. dollar equivalent of not less than $150.0 million, which amount shall be increased by 5% to the extent maintained in non-U.S. currencies. In connection therewith, an amount of cash and cash equivalents for the period (a) from the closing date until the date 30 days thereafter, not less than $50.0 million, and (b) thereafter, not less than $75.0 million, shall be maintained by the CV Borrower and its subsidiaries in accounts at Bank of America, N.A., in accordance with existing cash management agreements.

Obligations under the term loan facility are secured by a pledge of 65% of the membership interests of WII LLC as well as rights under the partnership agreement of Westlake International Holdings C.V., a limited partnership organized under the laws of The Netherlands, held by WII LLC and the CV Borrower.

Credit Agreement

On August 23, 2016, we and certain of our subsidiaries entered into an unsecured revolving credit facility (the "Credit Agreement"), by and among us, the other borrowers and guarantors referred to therein, the lenders from time to time party thereto (collectively, the "Lenders"), the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent. Under the Credit Agreement, the Lenders have committed to provide an unsecured five-year revolving credit facility in an aggregate principal amount of up to $1.0 billion. The Credit Agreement replaced our existing $400.0 million senior secured third amended and restated credit facility, dated as of July 17, 2014 (the "Prior ABL Credit Agreement"), by and among us, the financial institutions party thereto, as lenders, Bank of America, N.A., as agent, and us and certain of our subsidiaries, as borrowers. The Credit Agreement includes a $150.0 million sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under the facility. The Credit Agreement also provides for a discretionary $50.0 million commitment for swing-line loans to be provided on a same-day basis. We may also increase the size of the facility, in increments of at least $25.0 million, up to a maximum of $500.0 million, subject to certain conditions and if certain Lenders agree to commit to such an increase. On October 14, 2016, certain domestic subsidiaries of Axiall and Lagoon LLC were added as subsidiary guarantors to the Credit Agreement.

At September 30, 2016, we had $325.0 million borrowings outstanding under the Credit Agreement. Borrowings under the Credit Agreement will bear interest, at our option, at either (a) LIBOR plus a spread ranging from 1.0% to 1.75% that will vary depending on our credit rating or (b) Alternate Base Rate plus a spread ranging from 0.0% to 0.75% that will vary depending on our credit rating. The Credit Agreement also requires an undrawn commitment fee ranging from 0.10% to 0.25% that will vary depending on our credit rating. The Credit Agreement matures on August 23, 2021. As of September 30, 2016, we had outstanding letters of credit totaling $76.6 million and borrowing availability of $598.4 million under the Credit Agreement.

Our obligations under the Credit Agreement are guaranteed by our current and future material domestic subsidiaries, subject to customary exceptions. The Credit Agreement contains customary affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant. The Credit Agreement also contains customary events of default and if and for so long as an event of default has occurred and is continuing, any amounts outstanding under the Credit Agreement will accrue interest at an increased rate, the Lenders can terminate their commitments thereunder and payments of any outstanding amounts could be accelerated by the Lenders. As of September 30, 2016, we were in compliance with the total leverage ratio financial maintenance covenant.

GO Zone and IKE Zone Bonds

As of September 30, 2016, we had drawn all the proceeds from the issuance of the 6 ½% senior notes due 2029, 6 ¾% senior notes due 2032, 6 ½% 2035 GO Zone Senior Notes and 6 ½% 2035 IKE Zone Senior Notes. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt" in the 2015 Form 10-K for more information on the 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% 2035 GO Zone Senior Notes and the 6 ½% 2035 IKE Zone Senior Notes. All domestic restricted subsidiaries that guarantee other debt of ours or of another guarantor of the Senior Notes in excess of $5.0 million are guarantors of these notes.

The indentures governing the Senior Notes contain customary covenants and events of default. Accordingly, these agreements generally impose significant operating and financial restrictions on us. These restrictions, among other things, provide limitations on incurrence of additional indebtedness, the payment of dividends, certain investments and acquisitions

49

and sales of assets. However, the effectiveness of certain of these restrictions is currently suspended because the Senior Notes are currently rated investment grade by at least two nationally recognized credit rating agencies. The most significant of these provisions, if it were currently effective, would restrict us from incurring additional debt, except specified permitted debt (including borrowings under our credit facility), when our fixed charge coverage ratio is below 2.0:1. These limitations are subject to a number of important qualifications and exceptions, including, without limitation, an exception for the payment of our regular quarterly dividend of up to $0.10 per share. If the restrictions were currently effective, distributions in excess of $100.0 million would not be allowed unless, after giving pro forma effect to the distribution, our fixed charge coverage ratio is at least 2.0:1 and such payment, together with the aggregate amount of all other distributions after January 13, 2006, is less than the sum of 50% of our consolidated net income 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 proceeds received after October 1, 2003 as a contribution to our common equity capital or from the issuance or sale of certain securities, plus several other adjustments.

3.60% Senior Notes due 2022

The 3.60% senior notes due 2022 are unsecured and were issued with an original issue discount of $1.2 million. There is no sinking fund and no scheduled amortization of the 3.60% senior notes due 2022 prior to maturity. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt" in the 2015 Form 10-K for more information on the 3.60% senior notes due 2022. All of our domestic subsidiaries that guarantee other indebtedness of ours or of another guarantor of the 3.60% senior notes due 2022 in excess of $5.0 million are guarantors of the 3.60% senior notes due 2022.

The indenture governing the 3.60% senior notes due 2022 contains customary events of default and covenants that will restrict our 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 our or their assets.

3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046

On August 10, 2016, we completed our private offering of our $750.0 million aggregate principal amount of the 3.60% 2026 Senior Notes and $700.0 million aggregate principal amount of the 5.0% 2046 Senior Notes. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes are our senior obligations and are guaranteed on a senior basis by certain of our existing and future domestic subsidiaries. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes and guarantees are unsecured and rank equally with our existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. We have entered into a registration rights agreement in which we have agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes. The net proceeds from the offering were used to finance the Merger and to repay amounts under the term loan facility dated February 27, 2015 entered into by Axiall Holdco, Inc. (a wholly-owned subsidiary of Axiall), as the borrower, with the financial institutions party thereto. All of our domestic subsidiaries that guarantee other indebtedness of ours or of another guarantor of the 3.60% 2026 Senior Notes or 5.0% 2046 Senior Notes in excess of $40.0 million are guarantors of the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes.

The indenture governing the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes contains customary events of default and covenants that will restrict our 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 our or their assets.

Exchange Offers

On September 7, 2016, we completed offers to exchange (the "Axiall Exchange Offers") any and all of the $688.0 million aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and the $450.0 million aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes (together with the 4.625% Subsidiary 2021 Senior Notes, the "Subsidiary Notes") issued by Axiall for new senior notes issued by us having the same maturity and interest rates as the Subsidiary Notes. The 4.625% Subsidiary 2021 Senior Notes and the 4.875% Subsidiary 2023 Senior Notes were assumed at fair value, which resulted in a premium on the Subsidiary Notes of $33.5 million and $15.8 million, respectively. The Axiall Exchange Offers, pursuant to which $624.8 million aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $433.8 million aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes were exchanged, respectively, for $624.8 million aggregate principal amount of the 4.625% Westlake 2021 Senior Notes and $433.8 million aggregate principal amount of the 4.875% Westlake 2023 Senior Notes, leaving outstanding $63.2 million aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $16.2 million aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes. The Subsidiary Notes are the senior unsecured obligations of Axiall and Eagle Spinco, respectively. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes are our senior obligations and are guaranteed on a senior basis by certain of our

50

existing and future domestic subsidiaries. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes and guarantees are unsecured and rank equally with our existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. We have entered into a registration rights agreement in which we have agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes. All of our domestic subsidiaries that guarantee other indebtedness of ours or of another guarantor of the 4.625% Westlake 2021 Senior Notes or the 4.875% Westlake 2023 Senior Notes in excess of $40.0 million are guarantors of the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes.

The indenture governing the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes contains customary events of default and covenants that will restrict our 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 our or their assets.

Revenue Bonds

In 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 $10.9 million principal amount of tax-exempt waste disposal revenue bonds in order to finance our construction of waste disposal facilities for an ethylene plant. The waste disposal revenue bonds expire in December 2027 and are subject to redemption and mandatory tender for purchase prior to maturity under certain conditions. Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent and is payable quarterly.

Westlake Chemical Partners LP Credit Arrangements

Our subsidiary, Westlake Chemical Finance Corporation, is the lender party to a $300.0 million revolving credit facility with Westlake Chemical Partners LP ("Westlake Partners"). The revolving credit facility matures in 2018. Borrowings under the revolver bear interest at LIBOR plus a spread ranging from 2.0% to 3.0% (depending on Westlake Partners' consolidated leverage ratio), payable quarterly. Westlake Partners 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. As of September 30, 2016, outstanding borrowings under the credit facility totaled $135.3 million and bore interest at the LIBOR rate plus 2.0%.

Our subsidiary, Westlake Development Corporation, is the lender party to a $600.0 million revolving credit facility with OpCo. The revolving credit facility matures in 2019. As of September 30, 2016, outstanding borrowings under the credit facility totaled $428.0 million and bore interest at the LIBOR rate plus 3.0%, 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 credit facilities described above between our subsidiaries and Westlake Partners and OpCo are eliminated upon consolidation.

Off-Balance Sheet Arrangements

None.

FORWARD-LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 provides safe harbor provisions for forward-looking information. Certain of the statements contained in this report are forward-looking statements. All statements, other than statements of historical facts, included in this report that address activities, events or developments that we expect, project, believe or anticipate will or may occur in the future are forward-looking statements. Forward-looking statements can be identified by the use of words such as "believes," "intends," "may," "should," "could," "anticipates," "expected" or comparable terminology, or by discussions of strategies or trends. Similarly, statements made herein and elsewhere regarding our acquisition of Axiall are also forward-looking statements, including statements regarding the expected benefits of the acquisition on our future business, operations and financial performance and our ability to successfully integrate the recently acquired business. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we cannot give any assurances that these expectations will prove to be correct. Forward-looking statements relate to matters such as:

• future operating rates, margins, cash flow and demand for our products;

• industry market outlook, including the price of crude oil;

• production capacities;

51

• currency devaluation;

• our ability to borrow additional funds under the Credit Agreement;

• our ability to meet our liquidity needs;

• our ability to meet debt obligations under our debt instruments;

• our intended quarterly dividends;

• future capacity additions and expansions in the industry;

• timing, funding and results of capital projects, such as the expansion program at our Calvert City facility;

• results of acquisitions, including our acquisition of Axiall (including the benefits, results and effects thereof);

• pension plan obligations, funding requirements and investment policies;

• 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 other greenhouse gases 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, expected future developments and other factors we believe were appropriate in the circumstances when the statements were made. Forward-looking statements by their nature involve substantial risks and uncertainties that could significantly impact expected results, and actual future results could differ materially from those described in such statements. These statements are subject to a number of assumptions, risks and uncertainties, including those described in "Risk Factors" in the 2015 Form 10-K and the following:

• general economic and business conditions;

• the cyclical nature of the chemical industry;

• the availability, cost and volatility of raw materials and energy;

• uncertainties associated with the United States, European and worldwide economies, including those due to political tensions and unrest in the Middle East, the Commonwealth of Independent States (including Ukraine) and elsewhere;

• current and potential governmental regulatory actions in the United States and other countries and political unrest in other areas;

• industry production capacity and operating rates;

• the supply/demand balance for our products;

• competitive products and pricing pressures;

• instability in the credit and financial markets;

• access to capital markets;

• terrorist acts;

• operating interruptions (including leaks, explosions, fires, weather-related incidents, mechanical failure, unscheduled downtime, labor difficulties, transportation interruptions, spills and releases and other environmental risks);

• changes in laws or regulations;

• technological developments;

• our ability to realize anticipated benefits of the Merger and to integrate Axiall's business;

• charges or other liabilities relating to the Merger;

• the significant indebtedness that we have incurred in connection with the Merger;

• our ability to integrate acquired businesses other than Axiall;

• foreign currency exchange risks;

52

• our ability to implement our business strategies; and

• creditworthiness of our customers.

Many of these factors are beyond our ability to control or predict. Any of the factors, or a combination of these factors, could materially affect our future results of operations and the ultimate accuracy of the forward-looking statements. These forward-looking statements are not guarantees of our future performance, and our actual results and future developments may differ materially from those projected in the forward-looking statements. Management cautions against putting undue reliance on forward-looking statements or projecting any future results based on such statements or present or prior earnings levels. Every forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Commodity Price Risk

A 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 instability through various business strategies. Our strategies include ethylene feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. We use derivative instruments in certain instances to reduce price volatility risk on feedstocks and products. Based on our open derivative positions at September 30, 2016, a hypothetical $0.10 increase in the price of a gallon of ethane would have increased our income before taxes by $19.4 million and a hypothetical $0.10 increase in the price of a gallon of propane would have increased our income before taxes by $6.3 million. Additional information concerning derivative commodity instruments appears in Notes 14 and 15 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q.

Interest Rate Risk

We are exposed to interest rate risk with respect to fixed and variable rate debt. At September 30, 2016, we had $485.9 million principal amount of variable rate debt outstanding. All of the debt outstanding under our current term loan facility, the Credit Agreement and our loan relating to the tax-exempt waste disposal revenue bonds are at variable rates. We do not currently hedge our variable interest rate debt, but we may do so in the future. The average variable interest rate for our variable rate debt of $485.9 million as of September 30, 2016 was 2.26%. A hypothetical 100 basis point increase in the average interest rate on our variable rate debt would increase our annual interest expense by approximately $4.9 million. Also, at September 30, 2016, we had $3.3 billion aggregate principal amount of fixed rate debt. We are subject to the risk of higher interest cost if and when this debt is refinanced. If interest rates were 1% higher at the time of refinancing, our annual interest expense would increase by approximately $33.4 million.

Foreign Currency Exchange Rate Risk

We are exposed to foreign currency exchange rate risk associated with our international operations. However, the effect of fluctuations in foreign currency exchange rates caused by our international operations has not had a material impact on our overall operating results. We may engage in activities to mitigate our exposure to foreign currency exchange risk in certain instances through the use of currency exchange derivative instruments, including forward exchange contracts, or spot purchases. A forward exchange contract obligates us to exchange predetermined amounts of specified currencies at a stated exchange rate on a stated date.

53

Item 4. Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer, of the effectiveness of our disclosure controls and procedures pursuant to Rules 13a-15 or 15d-15 under the Securities Exchange Act of 1934 as of the end of the period covered by this report. Based upon that evaluation, our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer concluded that our disclosure controls and procedures are effective with respect to (i) the accumulation and communication to our management, including our Chief Executive Officer and our Chief Financial Officer, of information required to be disclosed by us in the reports that we submit under the Exchange Act, and (ii) the recording, processing, summarizing and reporting of such information within the time periods specified in the SEC's rules and forms.

There were no changes in our internal control over financial reporting that occurred during the three months ended September 30, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

54

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The 2015 Form 10-K, filed on February 24, 2016, contained a description of various legal proceedings in which we are involved, including environmental proceedings at our facilities in Calvert City. See Note 20 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q for a description of certain of those proceedings, which information is incorporated by reference herein.

Item 1A. Risk Factors

For a discussion of risk factors, please read Item 1A, "Risk Factors" in the 2015 Form 10-K. The information below includes additional risks relating to our acquisition of Axiall. The risks described below and in other documents that we file from time to time with the Securities and Exchange Commission could materially and adversely affect our business, results of operations, cash flow, liquidity or financial condition.

We may not realize all of the anticipated benefits of the Merger or those benefits may take longer to realize than expected. We may also encounter significant unexpected difficulties in integrating the two businesses.

Our ability to realize the anticipated benefits of the Merger will depend, to a large extent, on our ability to integrate the Westlake and Axiall businesses. The combination of two independent businesses is a complex, costly and time-consuming process. As a result, we will be required to devote significant management attention and resources to integrating Axiall's business practices and operations with our existing business practices and operations. The integration process may disrupt the businesses and, if implemented ineffectively or if impacted by unforeseen negative economic or market conditions or other factors, we may not realize the full anticipated benefits of the Merger. Our failure to meet the challenges involved in integrating the two businesses to realize the anticipated benefits of the Merger could cause an interruption of, or a loss of momentum in, our activities and could adversely affect our results of operations.

In addition, the overall integration of the businesses may result in material unanticipated problems, expenses, liabilities, competitive responses, loss of customer relationships, and diversion of management's attention. The difficulties of combining the operations of the companies include, among others:

• the diversion of management's attention to integration matters;

• difficulties in achieving anticipated cost savings, synergies, business opportunities and growth prospects from combining Axiall's business with our business;

• difficulties entering new markets or manufacturing in new geographies where we have no or limited direct prior experience;

• difficulties in the integration of operations and systems;

• difficulties in the assimilation of employees;

• difficulties in managing the expanded operations of a significantly larger and more complex company;

• successfully managing relationships with our strategic partners and our supplier and customer base;

• challenges in maintaining existing, and establishing new, business relationships; and

• challenges in attracting and retaining key personnel.

Many of these factors will be outside of our control and any one of them could result in increased costs, decreases in the amount of expected revenues and diversion of management's time and energy, which could materially impact the business, financial condition and our results of operations. In addition, even if the operations of our business and Axiall's business are integrated successfully, we may not realize the full benefits of the Merger, including the synergies, cost savings or sales or growth opportunities that we expect. These benefits may not be achieved within the anticipated time frame, or at all. Furthermore, additional unanticipated costs may be incurred in the integration of the businesses. All of these factors could decrease or delay the expected accretive effect of the Merger and negatively impact us. As a result, we cannot be certain that the combination of the Westlake and Axiall businesses will result in the realization of the full benefits anticipated from the Merger.

55

The Merger may result in significant charges or other liabilities that could adversely affect the financial results of the combined company.

The financial results of the combined company may be adversely affected by cash expenses and non-cash accounting charges incurred in connection with our integration of the business and operations of Axiall with our existing business and operations. The amount and timing of these possible charges are not yet known. Further, our failure to identify or accurately assess the magnitude of certain liabilities that we are assuming in the Merger could result in unexpected litigation or regulatory exposure, unfavorable accounting charges, unexpected increases in taxes due, a loss of anticipated tax benefits or other adverse effects on our business, operating results or financial condition. The price of our common stock following the Merger could decline to the extent the combined company's financial results are materially affected by any of these events.

Our level of debt, including that incurred in connection with the Merger, could adversely affect our ability to operate our business.

In connection with the Merger, we substantially increased our indebtedness, which could adversely affect our ability to fulfill our obligations and have a negative impact on our financing options and liquidity position. As of September 30, 2016, our total indebtedness was $3.8 billion, and our debt represented approximately 50% of our total capitalization. Our annual interest expense for 2015 was $34.7 million, net of interest capitalized of $10.4 million. On August 10, 2016, we issued $1.45 billion aggregate principal amount of senior notes in order to finance part of the Merger consideration. On August 23, 2016, we entered into the Credit Agreement (replacing the Prior ABL Credit Agreement). On September 7, 2016, we completed the Axiall Exchange Offers, pursuant to which $624.8 million aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $433.8 million aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes were exchanged for $624.8 million aggregate principal amount of the 4.625% Westlake 2021 Senior Notes and $433.8 million aggregate principal amount of the 4.875% Westlake 2023 Senior Notes, respectively, leaving outstanding $63.2 million aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $16.2 million aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes.

Our level of debt and the limitations imposed on us by our existing or future debt agreements could have significant consequences on our business and future prospects, including the following:

• a portion of our cash flow from operations will be dedicated to the payment of interest and principal on our debt and will not be available for other purposes, including the payment of dividends;

• we may not be able to obtain necessary financing in the future for working capital, capital expenditures, acquisitions, debt service requirements or other purposes;

• our less leveraged competitors could have a competitive advantage because they have greater flexibility to utilize their cash flow to improve their operations;

• 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 in higher 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 opportunities and 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 cost effective interest rates.

These factors could be magnified or accelerated to the extent we were to finance future acquisitions with significant amounts of debt.

The Credit Agreement and the indenture governing the Senior Notes impose significant operating and financial restrictions, which may prevent us from capitalizing on business opportunities and taking some actions.

The Credit Agreement and the indenture governing the Senior Notes impose significant operating and financial restrictions on us. These restrictions limit our ability to:

• pay dividends on, redeem or repurchase our capital stock;

• make investments and other restricted payments;

• incur additional indebtedness or issue preferred stock;

• create liens;

• permit dividend or other payment restrictions on our restricted subsidiaries;

56

• sell all or substantially all of our assets or consolidate or merge with or into other companies;

• engage in transactions with affiliates; and

• engage in sale-leaseback transactions.

These limitations are subject to a number of important qualifications and exceptions. However, the effectiveness of many of these restrictions in the indenture governing the Senior Notes is currently suspended under the indenture because the Senior Notes are currently rated investment grade by at least two nationally recognized credit rating agencies.

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 a default 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 be immediately due and payable. In addition, any acceleration of debt under the Credit Agreement will constitute a default under some of our other debt, including the indenture governing the Senior Notes, the 3.60% 2026 Senior Notes, the 5.0% 2046 Senior Notes, the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information on our purchase of equity securities during the quarter ended September 30, 2016.

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans or Programs (2)
July 2016	—	$	—	—	$	171,285,000
August 2016	16,613	$	51.91	—	$	171,285,000
September 2016	13,212	$	51.11	—	$	171,285,000
	29,825	$	51.56	—

_____________

(1) Represents shares withheld in satisfaction of withholding taxes due upon the vesting of restricted stock and restricted stock units granted to our employees under the 2013 Plan.

(2) In November 2014, our Board of Directors authorized a $250.0 million share repurchase program (the "2014 Program"). In November 2015, our Board of Directors approved the expansion of the 2014 Program by an additional $150.0 million. As of September 30, 2016, 4,193,598 shares of common stock had been acquired at an aggregate purchase price of approximately $228.7 million under the 2014 Program. Transaction fees and commissions are not reported in the average price 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 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.

57

Item 6. Exhibits

Exhibit No.
4.1	Eighth Supplemental Indenture (including the form of the Notes), dated as of August 10, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and The Bank 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-K, filed on August 10, 2016, File No. 001-32260)
4.2	Fourth 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 Report on Form 8-K, filed on August 22, 2016, File No. 001-09753)
4.3	Fifth Supplemental Indenture, dated as of August 22, 2016, to the Indenture, dated as of January 28, 2013, by and among Eagle Spinco, Inc., the guarantors party thereto and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.2 to Axiall's Current Report on Form 8-K, filed on August 22, 2016, File No. 001-09753)
4.4	Ninth Supplemental Indenture (including the form of the Notes) as of September 7, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and the Bank 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-K, filed on September 7, 2016, File No. 001-32260)
4.5	Indenture dated as of September 8, 2016 by and among Westlake and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.4 to Westlake's Registration Statement on Form S-3, filed on September 8, 2016, File No. 333-213548)
10.1	Registration Rights Agreement, dated as of August 10, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and Deutsche Bank Securities Inc. and Goldman Sachs & Co., as representatives of the Initial Purchasers (as defined therein) (incorporated by reference to Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on August 10, 2016, File No. 001-32260)
10.2	Registration Rights Agreement, dated as of September 7, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and Deutsche Bank Securities Inc. and Goldman, Sachs & Co., as dealer managers (incorporated by reference to Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on September 7, 2016, File No. 001-32260)
10.3†	Credit Agreement, dated as of August 10, 2016, by and between Bank of America, N.A. and Westlake International Holdings II C.V.
10.4	Credit Agreement dated as of August 23, 2016, by and among Westlake Chemical Corporation, the other borrowers and guarantors referred to therein, the lenders from time to time party thereto, the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent, relating to a $1 billion senior unsecured revolving credit facility (incorporated by reference to Exhibit 10.1 to Westlake's Current Report on Form 8-K, filed on August 24, 2016, File No. 001-32260)
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
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

______________________________

† Filed herewith.

# Furnished herewith.

58

SIGNATURES

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

		WESTLAKE CHEMICAL CORPORATION
Date:	November 9, 2016	By:	/S/    ALBERT CHAO
			Albert Chao
			President and Chief Executive Officer (Principal Executive Officer)
Date:	November 9, 2016	By:	/S/    M. STEVEN BENDER
			M. Steven Bender
			Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

59

EXHIBIT INDEX

Exhibit No.	Exhibit
4.1	Eighth Supplemental Indenture (including the form of the Notes), dated as of August 10, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and The Bank 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-K, filed on August 10, 2016, File No. 001-32260)
4.2	Fourth 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 Report on Form 8-K, filed on August 22, 2016, File No. 001-09753)
4.3	Fifth Supplemental Indenture, dated as of August 22, 2016, to the Indenture, dated as of January 28, 2013, by and among Eagle Spinco, Inc., the guarantors party thereto and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.2 to Axiall's Current Report on Form 8-K, filed on August 22, 2016, File No. 001-09753)
4.4	Ninth Supplemental Indenture (including the form of the Notes) as of September 7, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and the Bank 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-K, filed on September 7, 2016, File No. 001-32260)
4.5	Indenture dated as of September 8, 2016 by and among Westlake and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.4 to Westlake's Registration Statement on Form S-3, filed on September 8, 2016, File No. 333-213548)
10.1	Registration Rights Agreement, dated as of August 10, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and Deutsche Bank Securities Inc. and Goldman Sachs & Co., as representatives of the Initial Purchasers (as defined therein) (incorporated by reference to Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on August 10, 2016, File No. 001-32260)
10.2	Registration Rights Agreement, dated as of September 7, 2016, among Westlake Chemical Corporation, the Guarantors (as defined therein) and Deutsche Bank Securities Inc. and Goldman, Sachs & Co., as dealer managers (incorporated by reference to Exhibit 4.3 to Westlake's Current Report on Form 8-K, filed on September 7, 2016, File No. 001-32260)
10.3†	Credit Agreement, dated as of August 10, 2016, by and between Bank of America, N.A. and Westlake International Holdings II C.V.
10.4	Credit Agreement dated as of August 23, 2016, by and among Westlake Chemical Corporation, the other borrowers and guarantors referred to therein, the lenders from time to time party thereto, the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent, relating to a $1 billion senior unsecured revolving credit facility (incorporated by reference to Exhibit 10.1 to Westlake's Current Report on Form 8-K, filed on August 24, 2016, File No. 001-32260)
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
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

______________________________

† Filed herewith.

# Furnished herewith.

60

EX-10.3

Exhibit 10.3

CREDIT AGREEMENT

Dated as of August 10, 2016

among

THE FINANCIAL INSTITUTIONS NAMED HEREIN

as the Lenders

and

BANK OF AMERICA, N.A.

as the Agent

and

WESTLAKE INTERNATIONAL HOLDINGS II C.V.,

ACTING THROUGH WESTLAKE OLEFINS CORPORATION,

ITS GENERAL PARTNER

as the Borrower

$150,000,000

TABLE OF CONTENTS

		Page
	ARTICLE I
	LOANS
SECTION 1.1	Facility	1
SECTION 1.2	Loans	1
	ARTICLE II
	INTEREST AND FEES
SECTION 2.1	Interest	2
SECTION 2.2	Continuation and Conversion Elections	3
SECTION 2.3	Maximum Interest Rate	3
SECTION 2.4	Closing Fee	4
	ARTICLE III
	PAYMENTS AND PREPAYMENTS
SECTION 3.1	Loans	4
SECTION 3.2	Prepayments of the Loans	4
SECTION 3.3	LIBOR Rate Loan Prepayments	4
SECTION 3.4	Payments by the Borrower	4
SECTION 3.5	Apportionment, Application and Reversal of Payments	4
SECTION 3.6	Indemnity for Returned Payments	5
SECTION 3.7	Agent's and Lenders' Books and Records; Monthly Statements	5
	ARTICLE IV
	TAXES, YIELD PROTECTION AND ILLEGALITY
SECTION 4.1	Taxes	5
SECTION 4.2	Lender Tax Information	6
SECTION 4.3	Illegality	8
SECTION 4.4	Increased Costs; Capital Adequacy	8
SECTION 4.5	Funding Losses	9
SECTION 4.6	Inability to Determine Rates	9
SECTION 4.7	Certificates of the Agent	9
SECTION 4.8	Delay in Requests	9
SECTION 4.9	Mitigation	9
SECTION 4.10	Replacement of Lenders	9
SECTION 4.11	Survival	9

i

	ARTICLE V
	BOOKS AND RECORDS; FINANCIAL INFORMATION; NOTICES
SECTION 5.1	Books and Records	10
SECTION 5.2	Financial Information	10
SECTION 5.3	Notices to the Agent	10
	ARTICLE VI
	GENERAL WARRANTIES AND REPRESENTATIONS
SECTION 6.1	Authorization, Validity, and Enforceability of this Agreement and the Loan Documents	10
SECTION 6.2	Validity and Priority of Security Interest	11
SECTION 6.3	Organization and Qualification	11
SECTION 6.4	Corporate Name; Prior Transactions	11
SECTION 6.5	Subsidiaries and Affiliates	11
SECTION 6.6	Financial Statements and Projections	11
SECTION 6.7	Solvency	11
SECTION 6.8	Litigation	11
SECTION 6.9	No Violation of Law	11
SECTION 6.10	No Default	11
SECTION 6.11	Taxes	11
SECTION 6.12	Regulated Entities	11
SECTION 6.13	Use of Proceeds; Margin Regulations	12
SECTION 6.14	No Material Adverse Change	12
SECTION 6.15	Full Disclosure	12
SECTION 6.16	Governmental Authorization	12
SECTION 6.17	OFAC	12
SECTION 6.18	Anti-Corruption Laws	12
	ARTICLE VII
	AFFIRMATIVE AND NEGATIVE COVENANTS
SECTION 7.1	Taxes and Other Obligations	12
SECTION 7.2	Legal Existence and Good Standing	13
SECTION 7.3	Compliance with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents	13
SECTION 7.4	Insurance	13
SECTION 7.5	Mergers; Consolidations; or Sales	13
SECTION 7.6	Distributions	13
SECTION 7.7	Transactions Affecting Collateral or Obligations	13
SECTION 7.8	Debt	13
SECTION 7.9	Payment / Prepayment of Debt	14
SECTION 7.10	Transactions with Affiliates	14
SECTION 7.11	Business Conducted	15
SECTION 7.12	Liens	15

ii

SECTION 7.13	Fiscal Year	15
SECTION 7.14	Financial Covenant	15
SECTION 7.15	Use of Proceeds	15
SECTION 7.16	Collateral	15
SECTION 7.17	Further Assurances	15
SECTION 7.18	Burdensome Agreements	16
	ARTICLE VIII
	CONDITIONS OF LENDING
SECTION 8.1	Conditions Precedent of Making of Loans on the Closing Date	16
	ARTICLE IX
	DEFAULT; REMEDIES
SECTION 9.1	Events of Default	17
SECTION 9.2	Remedies	18
	ARTICLE X
	TERM AND TERMINATION
SECTION 10.1	Term and Termination	19
	ARTICLE XI
	AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS
SECTION 11.1	Amendments and Waivers	19
SECTION 11.2	Assignments; Participations	20
	ARTICLE XII
	THE AGENT
SECTION 12.1	Appointment and Authorization	22
SECTION 12.2	Delegation of Duties	22
SECTION 12.3	Liability of Agent	22
SECTION 12.4	Reliance by Agent	23
SECTION 12.5	Notice of Default	23
SECTION 12.6	Credit Decision	23
SECTION 12.7	Indemnification	23
SECTION 12.8	Agent in Individual Capacity	24
SECTION 12.9	Successor Agent	24
SECTION 12.10	Collateral Matters	24
SECTION 12.11	Restrictions on Actions by Lenders; Sharing of Payments	25
SECTION 12.12	Agency for Perfection	25

iii

SECTION 12.13	Payments by Agent to Lenders	25
SECTION 12.14	Settlement	25
SECTION 12.15	Concerning the Collateral and the Related Loan Documents	26
SECTION 12.16	Relation Among Lenders	26
	ARTICLE XIII
	MISCELLANEOUS
SECTION 13.1	No Waivers; Cumulative Remedies	26
SECTION 13.2	Severability	27
SECTION 13.3	Governing Law; Choice of Forum; Service of Process	27
SECTION 13.4	WAIVER OF JURY TRAIL	28
SECTION 13.5	Survival of Representations and Warranties	28
SECTION 13.6	Limited Recourse	28
SECTION 13.7	Fees and Expenses	28
SECTION 13.8	Notices	28
SECTION 13.9	Waiver of Notices	30
SECTION 13.10	Binding Effect	30
SECTION 13.11	Indemnity of the Agent and the Lenders by the Borrower	30
SECTION 13.12	Limitation of Liability	30
SECTION 13.13	No Advisory or Fiduciary Responsibility	31
SECTION 13.14	Final Agreement	31
SECTION 13.15	Counterparts	31
SECTION 13.16	Captions	31
SECTION 13.17	Right of Setoff	31
SECTION 13.18	Confidentiality	32
SECTION 13.19	Conflicts with Other Loan Documents	32
SECTION 13.20	Patriot Act Notice	32
SECTION 13.21	Electronic Execution	32
SECTION 13.22	Judgment Currency	32
SECTION 13.23	Acknowledgment and Consent to Bail-In of EEA Financial Institutions	33

iv

ANNEXES, EXHIBITS AND SCHEDULES

ANNEX A    –    DEFINITIONS

EXHIBIT A    –    FORM OF NOTE

EXHIBIT B    –    [Reserved]

EXHIBIT C    –    [Reserved]

EXHIBIT D    –    FORM OF NOTICE OF BORROWING

EXHIBIT E    –    FORM OF NOTICE OF CONTINUATION/CONVERSION

EXHIBIT F    –    FORM OF ASSIGNMENT AND ACCEPTANCE AGREEMENT

SCHEDULE 1.2    –    LENDERS’ COMMITMENTS

SCHEDULE 6.4    –    PRIOR CORPORATE NAMES

SCHEDULE 6.5    –    SUBSIDIARIES AND AFFILIATES

SCHEDULE 6.8    –    LITIGATION

SCHEDULE 7.8    –    DEBT

SCHEDULE 7.12    –    EXISTING LIENS

v

CREDIT AGREEMENT

This Credit Agreement, dated as of August 10, 2016 (this “Agreement”) among the financial institutions from time to time parties hereto (such financial institutions, together with their respective successors and assigns, are referred to hereinafter each individually as a “Lender”and collectively as the “Lenders”), Bank of America, N.A. with an office at 901 Main Street, Dallas, Texas, 75202, as agent for the Lenders (in its capacity as agent, the “Agent”), and WESTLAKE INTERNATIONAL HOLDINGS II C.V., a limited partnership organized under the laws of The Netherlands, having its registered office at The Corporation Trust Company, 1209 Orange Street, City of Wilmington, County of New Castle, Delaware 19801, United States of America and its principal place of business at 2801 Post Oak Boulevard, Houston, Texas 77056, United States of America (the “Borrower”), acting through WESTLAKE OLEFINS CORPORATION, a corporation organized under the laws of the state of Delaware, United States of America, having its registered office at The Corporation Trust Company, 1209 Orange Street, City of Wilmington, County of New Castle, Delaware 19801, United States of America and its principal place of business at 2801 Post Oak Boulevard, Houston, Texas 77056, United States of America, its general partner.

ARTICLE I
LOANS

SECTION 1.1Facility. Subject to all of the terms and conditions of this Agreement, the Lenders agree to make available a total credit facility of up to $150,000,000 (the “Facility”) to the Borrower from time to time during the term of this Agreement.

SECTION 1.2Loans.

(a)Loans and Notes.

(i)Amounts. Subject to the satisfaction of the conditions precedent set forth in Article 8, each Lender severally, but not jointly, agrees to make a term loan (the “Loans”) to the Borrower on the Closing Date in the amount of such Lender’s Commitment.

(ii)    The Borrower shall execute and deliver to each Lender so requesting a note to evidence the Loan of that Lender. Each note shall be in the principal amount of the requesting Lender’s Loans, dated the date hereof and substantially in the form of Exhibit A (each a “Note”and, collectively, the “Notes”). Each Note shall represent the obligation of the Borrower to pay the amount of the requesting Lender’s Loans, or, if less, the aggregate unpaid principal amount of such Lender’s Loans together with interest thereon as prescribed in Section 2.1. The entire unpaid balance of the Loans and all other Obligations (other than contingent obligations and indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination) shall be immediately due and payable in full in immediately available funds on the Maturity Date.

(b)Procedure for Borrowing.

(i)    Each Borrowing shall be made upon the Borrower’s irrevocable written notice delivered to the Agent in the form of a notice of borrowing in substantially the form of Exhibit D (“Notice of Borrowing”) and signed by the Borrower, which Notice of Borrowing shall be received by the Agent prior to (i) 12:00 noon (Houston, Texas time) three (3) Business Days prior to the requested Funding Date, in the case of LIBOR Rate Loans and (ii) 12:30 p.m. (Houston, Texas time) on the requested Funding Date, in the case of Base Rate Loans, specifying:

(A)    the amount of the Borrowing, which in the case of a LIBOR Rate Loan must equal or exceed $5,000,000 (and integral increments of $1,000,000 in excess of such amount or the entire amount of the Facility);

(B)    the requested Funding Date, which must be a Business Day; and

(C)    whether the Loans requested are to be Base Rate Loans or LIBOR Rate Loans (and if not specified, it shall be deemed a request for a Base Rate Loan).

1

(ii)    In lieu of delivering a Notice of Borrowing, the Borrower may give the Agent telephonic notice of such request for advances to the Designated Account on or before the deadline set forth above. The Agent at all times shall be entitled to rely on such telephonic notice in making such Loans, regardless of whether any written confirmation is received.

(c)Reliance upon Authority. Prior to the Closing Date, the Borrower shall deliver to the Agent, a notice setting forth the account of the Borrower (“Designated Account”) to which the Agent is authorized to transfer the proceeds of the Loans requested hereunder. The Agent is entitled to rely conclusively on any person’s request for Loans on behalf of the Borrower, so long as the proceeds thereof are to be transferred to the Designated Account. The Agent has no duty to verify the identity of any individual representing himself or herself as a person authorized by the Borrower to make such requests on its behalf.

(d)No Liability. The Agent shall not incur any liability to the Borrower as a result of acting upon any notice referred to in Sections 1.2(b) and (c), which the Agent believes in good faith to have been given by an officer or other person duly authorized by the Borrower to request Loans on its behalf. The crediting of Loans to the Designated Account conclusively establishes the obligation of the Borrower to repay such Loans as provided herein.

(e)Notice Irrevocable. Any Notice of Borrowing (or telephonic notice in lieu thereof) made pursuant to Section 1.2(b) shall be irrevocable. The Borrower shall be bound to borrow the funds requested therein in accordance therewith.

(f)Making of Loans. Promptly after receipt of a Notice of Borrowing or telephonic notice in lieu thereof, the Agent shall notify the Lenders by telecopy, telephone or e-mail of the requested Borrowing. Each Lender shall transfer its Pro Rata Share of the requested Borrowing available to the Agent in immediately available funds, to the account from time to time designated by the Agent, not later than 2:30 p.m. (Houston, Texas time) on the applicable Funding Date. After the Agent’s receipt of all proceeds of such Loans, the Agent shall make the proceeds of such Loans available to the Borrower on the applicable Funding Date by transferring same day funds to the Designated Account.

ARTICLE II
INTEREST AND FEES

SECTION 2.1Interest.

(a)Interest Rates. All outstanding Loans shall bear interest on the unpaid principal amount thereof (including, to the extent permitted by law, on interest thereon not paid when due) from the date made until paid in full in cash at a rate determined by reference to (x) the Base Rate or the LIBOR Rate plus (y) the Applicable Margin, but not to exceed the Maximum Rate. If at any time Loans are outstanding with respect to which the Borrower has not delivered to the Agent a notice specifying the basis for determining the interest rate applicable thereto in accordance herewith, those Loans shall bear interest at a rate determined by reference to the Base Rate plus the Applicable Margin (unless the Default Rate has been effected by the Agent and the Required Lenders pursuant to Section 2.1(b)) until notice to the contrary has been given to the Agent in accordance with this Agreement and such notice has become effective. Except as otherwise provided herein, the outstanding Loans shall bear interest as follows:

(i)    For all Base Rate Loans at a fluctuating per annum rate equal to the Base Rate plus the Applicable Margin; and

(ii)    For all LIBOR Rate Loans at a per annum rate equal to the LIBOR Rate plus the Applicable Margin.

Each change in the Base Rate shall be reflected in the interest rate applicable to Base Rate Loans as of the effective date of such change. All interest charges for LIBOR Rate Loans shall be computed on the basis of a year of 360 days and actual days elapsed (which results in more interest being paid than if computed on the basis of a 365-day year). All interest charges for Base Rate Loans shall be computed on the basis of a year of 365 or 366 days, as the case may be, and for actual days elapsed. The Borrower shall pay to the Agent, for the ratable benefit of Lenders, interest accrued on all Base Rate Loans in arrears on the first day of each month hereafter and on the Maturity Date. The Borrower shall pay to the Agent, for the ratable benefit of Lenders, interest on all LIBOR Rate Loans in arrears on each LIBOR Interest Payment Date. The Agent does not warrant or accept responsibility for, nor shall it have any liability with respect to, administration, submission or any other matter related to any rate described in the definition of LIBOR Rate.

2

(b)Default Rate. If any Event of Default occurs and is continuing and the Agent or the Required Lenders in their discretion so elect, then, while any such Event of Default is continuing, (i) the principal amount of all Loans shall bear interest at the Default Rate applicable thereto; and (ii) any other amount (other than principal of any Loan) payable by the Borrower under any Loan Document shall bear interest at the Default Rate applicable to Base Rate Loans.

SECTION 2.2Continuation and Conversion Elections.

(a)    The Borrower may:

(i)    elect, as of any Business Day, in the case of Base Rate Loans, to convert any Base Rate Loans (or any part thereof in an amount not less than $5,000,000, or that is in an integral multiple of $1,000,000 in excess thereof) into LIBOR Rate Loans; or

(ii)    elect, as of the last day of the applicable Interest Period, to continue any LIBOR Rate Loans having Interest Periods expiring on such day (or any part thereof in an amount not less than $1,000,000, or that is in an integral multiple of $1,000,000 in excess thereof);

provided, that if at any time the aggregate amount of LIBOR Rate Loans in respect of any Borrowing is reduced, by payment, prepayment, or conversion of part thereof to be less than $1,000,000, such LIBOR Rate Loans shall automatically convert into Base Rate Loans.

(b)    The Borrower shall deliver a notice of continuation/conversion (“Notice of Continuation/Conversion”) to the Agent not later than 12:00 noon (Houston, Texas time) at least three (3) Business Days in advance of the Continuation/Conversion Date, if the Loans are to be converted into or continued as LIBOR Rate Loans and specifying:

(i)    the proposed Continuation/Conversion Date;

(ii)    the aggregate amount of Loans to be converted or continued; and

(iii)    the type of Loans resulting from the proposed conversion or continuation.

(c)    If upon the expiration of any Interest Period applicable to LIBOR Rate Loans, the Borrower has failed to select timely a new Interest Period to be applicable to LIBOR Rate Loans, the Borrower shall be deemed to have elected to convert such LIBOR Rate Loans into Base Rate Loans effective as of the expiration date of such Interest Period.

(d)    The Agent will promptly notify each Lender of its receipt of a Notice of Continuation/Conversion. All conversions and continuations shall be made ratably according to the respective outstanding principal amounts of the Loans with respect to which the notice was given held by each Lender.

(e)    There may not be more than twelve (12) different LIBOR Rate Loans in effect hereunder at any time.

SECTION 2.3Maximum Interest Rate. In no event shall any interest rate provided for hereunder (including any fees or other fees or other compensation which are deemed or determined to be interest) exceed the maximum rate legally chargeable by any Lender under applicable law for such Lender with respect to loans of the type provided for hereunder (the “Maximum Rate”). If, for any period, any interest, absent such limitation, would have exceeded the Maximum Rate, then the interest rate for that period shall be the Maximum Rate, and, if in future periods, that interest rate would otherwise be less than the Maximum Rate, then that interest rate shall remain at the Maximum Rate until such time as the amount of interest paid hereunder equals the amount of interest which would have been paid if the same had not been limited by the Maximum Rate. In the event that, upon payment in full of the Obligations, the total amount of interest paid or accrued under the terms of this Agreement is less than the total amount of interest which would, but for this Section 2.3, have been paid or accrued if the interest rate otherwise set forth in this Agreement had at all times been in effect, then the Borrower shall, to the extent permitted by applicable law, pay the Agent, for the account of the Lenders, an amount equal to the excess of (a) the lesser of (i) the amount of interest which would have been charged if the Maximum Rate had, at all times, been in effect or (ii) the amount of interest which would have accrued had the interest rate otherwise set forth in this Agreement, at all times, been in effect over (b) the amount of interest actually paid or accrued under this Agreement. If a court of competent jurisdiction determines that the Agent and/or any Lender has received interest and other charges hereunder in excess of the Maximum Rate, such excess shall be deemed received on account of, and shall automatically be applied to reduce, the Obligations

3

other than interest, in the inverse order of maturity, and if there are no Obligations outstanding, the Agent and/or such Lender shall refund to the Borrower such excess.

SECTION 2.4Closing Fee. The Borrower shall pay the Agent for its account the fees described in the Engagement Letter (the “Closing Fee”).

ARTICLE III
PAYMENTS AND PREPAYMENTS

SECTION 3.1Loans. The Borrower shall repay the outstanding principal balance of the Loans, plus all accrued but unpaid interest thereon, on the Maturity Date. The Borrower may prepay Loans at any time, and any amounts prepaid may not be reborrowed.

SECTION 3.2Prepayments of the Loans.

(a)Optional. The Borrower may, upon notice to the Agent, at any time or from time to time voluntarily prepay Loans in whole or in part without premium or penalty; provided that (A) such notice must be received by the Agent not later than 11:00 a.m. (1) three Business Days prior to any date of prepayment of Eurodollar Rate Loans and (2) on the date of prepayment of Base Rate Loans; (B) any prepayment of Eurodollar Rate Loans shall be in a principal amount of $5,000,000 or a whole multiple of $1,000,000 in excess thereof; and (C) any prepayment of Base Rate Loans shall be in a principal amount of $500,000 or a whole multiple of $100,000 in excess thereof or, in each case, if less, the entire principal amount thereof then outstanding. Each such notice shall specify the date and amount of such prepayment and the Loans to be prepaid and, if Eurodollar Rate Loans are to be prepaid, the Interest Period(s) of such Loans. The Agent will promptly notify each Lender of its receipt of each such notice, and of the amount of such Lender’s ratable portion of such prepayment (based on such Lender’s Applicable Percentage in respect of the Facility). If such notice is given by the Borrower, the Borrower shall make such prepayment and the payment amount specified in such notice shall be due and payable on the date specified therein.

(b)Mandatory. In the event that the Agent receives written advice from a nationally recognized tax counsel that there is a more likely than not probability that the Facility will be recast as equity under final or temporary U.S. Treasury regulations under Internal Revenue Code section 385, the Borrower shall repay the Facility promptly (and no later than 10 days) upon receiving written notice to the foregoing effect.

SECTION 3.3LIBOR Rate Loan Prepayments. In connection with any prepayment, if any LIBOR Rate Loans are prepaid prior to the expiration date of the Interest Period applicable thereto, the Borrower shall pay to the Lenders the amounts described in Section 4.5.

SECTION 3.4Payments by the Borrower.

(a)    All payments to be made by the Borrower shall be made without set off, recoupment or counterclaim. Except as otherwise expressly provided herein, all payments by the Borrower shall be made to the Agent for the account of the Lenders, at the account designated by the Agent and shall be made in Dollars and in immediately available funds, no later than 12:00 noon (Houston, Texas time) on the date specified herein. Any payment received by the Agent after such time shall be deemed (for purposes of calculating interest only) to have been received on the following Business Day and any applicable interest shall continue to accrue.

(b)    Subject to the provisions set forth in the definition of “Interest Period,”whenever any payment is due on a day other than a Business Day, such payment shall be due on the following Business Day, and such extension of time shall in such case be included in the computation of interest or fees, as the case may be.

SECTION 3.5Apportionment, Application and Reversal of Payments. Principal and interest payments shall be apportioned ratably among the Lenders (according to the unpaid principal balance of the Loans to which such payments relate held by each Lender) and payments of the fees shall, as applicable, be apportioned ratably among the Lenders, except for fees payable solely to the Agent and except as provided in Section 11.1(b) or 12.14(e). All payments shall be remitted to the Agent and all such payments not relating to principal or interest of specific Loans, or not constituting payment of specific fees, and all proceeds of Collateral received by the Agent following the occurrence and during the continuation of any Event of Default shall be applied, ratably, subject to the provisions of this Agreement, first, to pay any fees, indemnities, or expense reimbursements then due to the Agent from the Borrower; second, to pay any fees or expense reimbursements then due to the Lenders from the Borrower; third, to pay interest due in respect of

4

all Loans; and fourth, to pay or prepay principal of the Loans. Notwithstanding anything to the contrary contained in this Agreement, unless so directed by the Borrower, or unless an Event of Default has occurred and is continuing, neither the Agent nor any Lender shall apply any payments which it receives to any LIBOR Rate Loan, except (a) on the expiration date of the Interest Period applicable to any such LIBOR Rate Loan, or (b) in the event, and only to the extent, that there are no outstanding Base Rate Loans and, in any event, the Borrower shall pay LIBOR breakage losses in accordance with Section 4.5.

SECTION 3.6Indemnity for Returned Payments. If after receipt of any payment which is applied to the payment of all or any part of the Obligations, the Agent or any Lender is for any reason compelled to surrender such payment or proceeds to any Person because such payment or application of proceeds is invalidated, declared fraudulent, set aside, determined to be void or voidable as a preference, impermissible setoff, or a diversion of trust funds, or for any other reason, then the Obligations or part thereof intended to be satisfied shall be revived and continued and this Agreement shall continue in full force as if such payment or proceeds had not been received by the Agent or such Lender and the Borrower shall be liable to pay to the Agent and the Lenders, and hereby do indemnify the Agent and the Lenders and hold the Agent and the Lenders harmless for the amount of such payment or proceeds surrendered. The provisions of this Section 3.6 shall be and remain effective notwithstanding any contrary action which may have been taken by the Agent or any Lender in reliance upon such payment or application of proceeds, and any such contrary action so taken shall be without prejudice to the Agent’s and the Lenders’ rights under this Agreement and shall be deemed to have been conditioned upon such payment or application of proceeds having become final and irrevocable. The provisions of this Section 3.6 shall survive the termination of this Agreement.

SECTION 3.7Agent’s and Lenders’ Books and Records; Monthly Statements. The Agent shall record the principal amount of the Loans owing to each Lender from time to time on its books. In addition, each Lender may note the date and amount of each payment or prepayment of principal of such Lender’s Loans in its books and records. Failure by the Agent or any Lender to make such notation shall not affect the obligations of the Borrower with respect to the Loans. The Borrower agrees that the Agent’s and each Lender’s books and records showing the Obligations and the transactions pursuant to this Agreement and the other Loan Documents shall be admissible in any action or proceeding arising therefrom, and shall constitute rebuttably presumptive proof thereof, absent manifest error, irrespective of whether any Obligation is also evidenced by a promissory note or other instrument.

ARTICLE IV TAXES, YIELD PROTECTION AND ILLEGALITY

SECTION 4.1Taxes.

(a)Payments Free of Taxes; Obligation to Withhold; Tax Payment.

(i)    All payments of the Obligations by the Loan Parties shall be made without deduction or withholding for any Taxes, except as required by Requirement of Law. If Requirement of Law (as determined by an applicable Withholding Agent in its discretion) requires the deduction or withholding of any Tax from any such payment by the Agent or a Loan Party, then the Agent or such Loan Party shall be entitled to make such deduction or withholding based on information and documentation provided pursuant to Section 4.2.

(ii)    If the Agent or any Loan Party is required by the Code to withhold or deduct any Taxes from any payment, then (i) the Agent or applicable Loan Party shall timely pay the full amount to be withheld or deducted to the relevant Governmental Authority, and (ii) to the extent the withholding or deduction is made on account of Indemnified Taxes, the sum payable by the applicable Loan Party shall be increased as necessary so that the Recipient receives an amount equal to the sum it would have received had no such withholding or deduction been made.

(iii)    If the Agent or any Loan Party is required by any Requirement of Law other than the Code to withhold or deduct Taxes from any payment, then (i) the Agent or such Loan Party, to the extent required by Requirement of Law, shall timely pay the full amount to be withheld or deducted to the relevant Governmental Authority, and (ii) to the extent the withholding or deduction is made on account of Indemnified Taxes, the sum payable by the applicable Loan Party shall be increased as necessary so that the Recipient receives an amount equal to the sum it would have received had no such withholding or deduction been made.

5

(b)Payment of Other Taxes. Without limiting the foregoing, the Borrower shall timely pay to the relevant Governmental Authority in accordance with Requirement of Law, or at the Agent’s option, timely reimburse the Agent for payment of, any Other Taxes.

(c)Tax Indemnification.

(i)    The Borrower shall indemnify and hold harmless each Recipient against any Indemnified Taxes (including Indemnified Taxes imposed or asserted on or attributable to amounts payable under this Section) payable or paid by such Recipient or required to be withheld or deducted from a payment to such Recipient, and interest and reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. The Borrower shall make payment within 10 days after demand for any amount or liability payable under this Section. A certificate as to the amount of such payment or liability delivered to the Borrower by a Lender (with a copy to the Agent), or by the Agent on its own behalf or on behalf of any Recipient, shall be conclusive absent manifest error.

(ii)    Each Lender shall indemnify and hold harmless, on a several basis, the Agent against any Indemnified Taxes attributable to such Lender (but only to the extent the Borrower have not already paid or reimbursed the Agent therefor and without limiting the Borrower’ obligation to do so), that are payable or paid by the Agent in connection with any Obligations, and any reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. Each Lender shall make payment within 10 days after demand for any amount or liability payable under this Section. A certificate as to the amount of such payment or liability delivered to any Lender by the Agent shall be conclusive absent manifest error.

(d)Evidence of Payments. If the Agent or a Loan Party pays any Taxes pursuant to this Section, then upon request, the Agent shall deliver to the Borrower or the Borrower shall deliver to the Agent, respectively, a copy of a receipt issued by the appropriate Governmental Authority evidencing the payment, a copy of any return required by Requirement of Law to report the payment, or other evidence of payment reasonably satisfactory to the Agent or the Borrower, as applicable.

(e)Treatment of Certain Refunds. Unless required by Requirement of Law, at no time shall the Agent or the Borrower have any obligation to file for or otherwise pursue on behalf of a Lender, nor have any obligation to pay to any Lender, any refund of Taxes withheld or deducted from funds paid for the account of a Lender. If a Recipient determines in its reasonable discretion that it has received a refund of any Taxes as to which it has been indemnified by the Borrower or with respect to which the Borrower has paid additional amounts pursuant to this Section, it shall pay the Borrower an amount equal to such refund (but only to the extent of indemnity payments made, or additional amounts paid, by the Borrower with respect to the Taxes giving rise to such refund), net of all out-of-pocket expenses (including Taxes) incurred by such Recipient, and without interest (other than any interest paid by the relevant Governmental Authority with respect to such refund), provided that the Borrower agrees, upon request by the Recipient, to repay the amount paid over to the Borrower (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) to the Recipient if the Recipient is required to repay such refund to the Governmental Authority. Notwithstanding anything herein to the contrary, no Recipient shall be required to pay any amount to the Borrower if such payment would place the Recipient in a less favorable net after-Tax position than it would have been in if the Tax subject to indemnification and giving rise to such refund had not been deducted, withheld or otherwise imposed and the indemnification payments or additional amounts with respect to such Tax had never been paid. In no event shall the Agent or any Recipient be required to make its tax returns (or any other information relating to its Taxes that it deems confidential) available to any Loan Party or other Person.

(f)Survival. Each party’s obligations under Sections 4.1 and 4.2 shall survive the resignation or replacement of the Agent or any assignment of rights by or replacement of a Lender, the termination of the Commitments, and the repayment, satisfaction, discharge or Full Payment of any Obligations.

SECTION 4.2Lender Tax Information.

(a)Status of Lenders. Any Lender that is entitled to an exemption from or reduction of withholding Tax with respect to payments of Obligations shall deliver to the Borrower and the Agent properly completed and executed documentation reasonably requested by the Borrower or the Agent as will permit such payments to be made without or at a reduced rate of withholding. In addition, any Lender, if reasonably requested by the Borrower or

6

the Agent, shall promptly deliver such other documentation prescribed by Requirement of Law or reasonably requested by the Borrower or the Agent to enable them to determine whether such Lender is subject to backup withholding or information reporting requirements. Notwithstanding the foregoing, such documentation (other than documentation described in Sections 4.2(b)(i), (ii) and (iv)) shall not be required if a Lender reasonably believes delivery of the documentation would subject it to any material unreimbursed cost or expense or would materially prejudice its legal or commercial position.

(b)Documentation. Without limiting the foregoing, if any Loan Party is a U.S. Person,

(i)    Any Lender that is a U.S. Person shall deliver to the Borrower and the Agent on or prior to the date on which such Lender becomes a Lender hereunder (and from time to time thereafter upon reasonable request of the Borrower or the Agent), executed originals of IRS Form W-9, certifying that such Lender is exempt from U.S. federal backup withholding Tax;

(ii)    Any Foreign Lender shall, to the extent it is legally entitled to do so, deliver to the Borrower and the Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender hereunder (and from time to time thereafter upon reasonable request of the Borrower or the Agent), whichever of the following is applicable:

(A)    in the case of a Foreign Lender claiming the benefits of an income tax treaty to which the United States is a party, (x) with respect to payments of interest under any Loan Document, executed originals of IRS Form W-8BEN (or IRS Form W-8BENE, as applicable) establishing an exemption from or reduction of U.S. federal withholding Tax pursuant to the “interest” article of such tax treaty, and (y) with respect to other payments under the Loan Documents, IRS Form W-8BEN (or IRS Form W-8BENE, as applicable) establishing an exemption from or reduction of U.S. federal withholding Tax pursuant to the “business profits” or “other income” article of such tax treaty;

(B)    executed originals of IRS Form W-8ECI;

(C)    in the case of a Foreign Lender claiming the benefits of the exemption for portfolio interest under Section 881(c) of the Code, (x) a certificate in form satisfactory to the Agent and the Borrower to the effect that such Foreign Lender is not a “bank” within the meaning of Section 881(c)(3)(A) of the Code, a “10 percent shareholder” of the Borrower within the meaning of Section 881(c)(3)(B) of the Code, or a “controlled foreign corporation” described in Section 881(c)(3)(C) of the Code (“U.S. Tax Compliance Certificate”), and (y) executed originals of IRS Form W-8BEN (or IRS Form W-8BENE, as applicable); or

(D)    to the extent a Foreign Lender is not the beneficial owner, executed originals of IRS Form W-8IMY, accompanied by IRS Form W-8ECI, IRS Form W-8BEN (or IRS Form W-8BENE, as applicable), a U.S. Tax Compliance Certificate in form satisfactory to the Agent and the Borrower, IRS Form W-9, and/or other certification documents from each beneficial owner, as applicable; provided that if the Foreign Lender is a partnership and one or more direct or indirect partners of such Foreign Lender are claiming the portfolio interest exemption, such Foreign Lender may provide a U.S. Tax Compliance Certificate on behalf of each such direct and indirect partner;

(iii)    Any Foreign Lender shall, to the extent it is legally entitled to do so, deliver to the Borrower and the Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender hereunder (and from time to time thereafter upon the reasonable request of the Borrower or the Agent), executed originals of any other form prescribed by Requirement of Law as a basis for claiming exemption from or a reduction in U.S. federal withholding Tax, duly completed, together with such supplementary documentation as may be prescribed by Requirement of Law to permit the Borrower or the Agent to determine the withholding or deduction required to be made; and

(iv)    If payment of an Obligation to a Lender would be subject to U.S. federal withholding Tax imposed by FATCA if such Lender were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Code), such Lender shall deliver to the Borrower and the Agent at the time(s) prescribed by law and otherwise as reasonably requested by the Borrower or the Agent such documentation prescribed by Requirement of Law (including Section 1471(b)(3)(C)(i) of the Code) and such additional documentation reasonably requested by the Borrower or the Agent as may be necessary for them to comply with their obligations under FATCA and to determine

7

that such Lender has complied with its obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this clause (iv), “FATCA”shall include any amendments made to FATCA after the date hereof.

(c)Redelivery of Documentation. If any form or certification previously delivered by a Lender pursuant to this Section expires or becomes obsolete or inaccurate in any respect, such Lender shall promptly update the form or certification or notify the Borrower and the Agent in writing of its legal inability to do so.

SECTION 4.3Illegality.

(a)    If any Lender determines that the introduction of any Requirement of Law, or any change in any Requirement of Law, or in the interpretation or administration of any Requirement of Law, has made it unlawful, or that any central bank or other Governmental Authority has asserted that it is unlawful, for any Lender or its applicable lending office to make LIBOR Rate Loans, then, on notice thereof by that Lender to the Borrower through the Agent together with an explanation of the circumstances, any obligation of that Lender to make LIBOR Rate Loans shall be suspended until that Lender notifies the Agent and the Borrower that the circumstances giving rise to such determination no longer exist.

(b)    If a Lender determines that it is unlawful to maintain any LIBOR Rate Loan, the Borrower shall, upon its receipt of notice of such fact and demand from such Lender (with a copy to the Agent), prepay in full such LIBOR Rate Loans of that Lender then outstanding, together with interest accrued thereon and amounts required under Section 4.5, either on the last day of the Interest Period thereof, if that Lender may lawfully continue to maintain such LIBOR Rate Loans to such day, or immediately, if that Lender may not lawfully continue to maintain such LIBOR Rate Loans and if applicable convert to Base Rate Loans. If the Borrower are required to so prepay any LIBOR Rate Loans, then concurrently with such prepayment, the Borrower shall borrow from the affected Lender, in the amount of such prepayment, a Base Rate Loan.

SECTION 4.4Increased Costs; Capital Adequacy.

(a)Change in Law. If any Change in Law shall:

(i)    impose, modify or deem applicable any reserve, liquidity, special deposit, compulsory loan, insurance charge or similar requirement against assets of, deposits with or for the account of, or credit extended or participated in by, any Lender (except any reserve requirement reflected in calculating LIBOR Rate);

(ii)    subject any Recipient to Taxes (other than (i) Indemnified Taxes, (ii) Taxes described in clauses (b) through (d) of the definition of Excluded Taxes, and (iii) Connection Income Taxes) with respect to any Loan, Commitment or other obligations, or its deposits, reserves, other liabilities or capital attributable thereto; or

(iii)    impose on any Lender or the London interbank market any other condition, cost, or expense affecting any Loan, Loan Document or Commitment;

and the result thereof shall be to increase the cost to such Lender of making or maintaining any LIBOR Rate Loan or Commitment, or converting to or continuing any interest option for a Loan, or to reduce the amount of any sum received or receivable by such Lender hereunder (whether of principal, interest or any other amount) then, upon request of such Lender, the Borrower will, within ten (10) days of receipt of the certificate delivered by the Agent under Section 4.7, pay to such Lender such additional amount or amounts as will compensate such Lender for such additional costs incurred or reduction suffered.

(b)Capital Adequacy. If any Lender determines that any Change in Law affecting such Lender or any Lending Office of such Lender or such Lender’s holding company, if any, regarding capital or liquidity requirements has or would have the effect of reducing the rate of return on such Lender’s or holding company’s capital as a consequence of this Agreement, or such Lender’s Commitments, Loans to a level below that which such Lender or holding company could have achieved but for such Change in Law (taking into consideration such Lender’s and holding company’s policies with respect to capital adequacy), then from time to time the Borrower will pay to such Lender such additional amount or amounts as will compensate it or its holding company for any such reduction suffered, in each case, within ten (10) days of receipt of the certificate delivered under Section 4.7.

8

SECTION 4.5Funding Losses. If for any reason (other than default by a Lender) (a) any Borrowing of, or conversion to or continuation of, a LIBOR Rate Loan does not occur on the date specified therefor in a Notice of Borrowing or Notice of Conversion/Continuation (whether or not withdrawn), (b) any repayment or conversion of a LIBOR Rate Loan occurs on a day other than the end of its Interest Period, (c) the Borrower fails to repay a LIBOR Rate Loan when required hereunder, or (d) a Lender (other than a Defaulting Lender) is required to assign a LIBOR Rate Loan prior to the end of its Interest Period pursuant to Section 4.10, then the Borrower shall, within ten (10) days of receipt of the certificate delivered under Section 4.7, pay to each Lender expenses arising from liquidation or redeployment of funds or from fees payable to terminate deposits of matching funds. Lenders shall not be required to purchase Dollar deposits in the London interbank market or any other offshore Dollar market to fund any LIBOR Rate Loan, but the provisions hereof shall be deemed to apply as if each Lender had purchased such deposits to fund its LIBOR Rate Loans.

SECTION 4.6Inability to Determine Rates. The Agent will promptly notify the Borrower and Lenders if, in connection with any Loan or request for a Loan, (a) the Agent determines that (i) Dollar deposits are not being offered to banks in the London interbank Eurodollar market for the applicable Loan amount or Interest Period, or (ii) adequate and reasonable means do not exist for determining LIBOR Rate for the Interest Period; or (b) the Agent or Required Lenders determine for any reason that LIBOR Rate for the Interest Period does not adequately and fairly reflect the cost to Lenders of funding the Loan. Thereafter, Lenders’ obligations to make or maintain affected LIBOR Rate Loans and utilization of the LIBOR component (if affected) in determining Base Rate shall be suspended until the Agent (upon instruction by Required Lenders) withdraws the notice. Upon receipt of such notice, the Borrower may revoke any pending request for a LIBOR Rate Loan or, failing that, will be deemed to have requested a Base Rate Loan.

SECTION 4.7Certificates of the Agent. If any Lender claims reimbursement or compensation under this Article 4, the Agent shall determine the amount thereof and shall deliver to the Borrower (with a copy to the affected Lender) a certificate setting forth in reasonable detail the amount payable to the affected Lender, and such certificate shall be conclusive and binding on the Borrower in the absence of manifest error.

SECTION 4.8Delay in Requests. Failure or delay on the part of any Lender to demand compensation pursuant to this Section shall not constitute a waiver of its right to demand such compensation, but the Borrower shall not be required to compensate a Lender for any increased costs incurred or reductions suffered more than nine (9) months prior to the date that a Lender notifies the Borrower of the Change in Law giving rise to such increased costs or reductions and of such Lender’s intention to claim compensation therefor (except that, if the Change in Law giving rise to such increased costs or reductions is retroactive, then the nine-month period referred to above shall be extended to include the period of retroactive effect thereof).

SECTION 4.9Mitigation. If any Lender gives a notice under Section 4.3 or requests compensation under Section 4.4, or if the Loan Parties are required to pay any Indemnified Taxes or additional amounts with respect to a Lender under Section 4.1, then such Lender shall use reasonable efforts to designate a different Lending Office or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the judgment of such Lender, such designation or assignment (a) would eliminate the need for such notice or reduce amounts payable in the future, as applicable; and (b) in each case, would not subject such Lender to any material unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrower agrees to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

SECTION 4.10Replacement of Lenders. If any Lender requests compensation under Section 4.4, or if the Borrower is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 4.1, or if any Lender gives notice under Section 4.3, at the Borrower’s request, the Agent or an Eligible Assignee shall have the right (but not the obligation) with the Agent’s approval, to purchase from such Lender, and such Lender agrees that it shall sell, all its Commitments for an amount equal to the principal balances thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such Assignment and Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan Documents, including all principal, interest and fees through the date of assignment (but excluding any prepayment charge).

SECTION 4.11Survival. The agreements and obligations of the Borrower in this Article 4 shall survive the payment of all other Obligations.

9

ARTICLE V

BOOKS AND RECORDS; FINANCIAL INFORMATION; NOTICES

SECTION 5.1Books and Records. The Borrower and its Subsidiaries shall maintain, at all times, correct and complete books, records and accounts in which entries that are complete, correct and timely in all material respects.

SECTION 5.2Financial Information. The Borrower shall promptly furnish to the Agent all such financial information regarding the Loan Parties as the Agent shall reasonably request. Without limiting the foregoing, the Borrower will furnish to the Agent the following:

(a) all Financial Statements of the Borrower in the format delivered to the Agent prior to the date hereof that are prepared and delivered in connection with any other material Indebtedness of Westlake to the extent they are of a consolidating nature and incorporate any of the Loan Parties; provided, that any such Financial Statements that are publicly filed with the SEC shall be deemed delivered for all purposed herein; and

(b) Such additional information, in such detail as the Agent and/or the Lenders shall request in their reasonable discretion regarding the financial and business affairs of the Borrower or any of its Subsidiaries.

The Borrower hereby acknowledges that the Agent will make available to the Lenders materials and/or information provided by or on behalf of the Borrower hereunder (collectively, “Borrower Materials”) by posting the Borrower Materials on IntraLinks or another similar electronic system. The Agent agrees to use its best efforts in accordance with its standard business practices to post the Borrower Materials to IntraLinks or another similar electronic system. The Agent shall have no liability to the Lenders or the Borrower for any failure to post the Borrower Materials to IntraLinks or another similar electronic system.

SECTION 5.3Notices to the Agent. The Borrower shall notify the Agent in writing of the following matters at the following times:

(a)    Promptly after any Responsible Officer of any Loan Party becoming aware of any Default or Event of Default;

(b)    Promptly after any Responsible Officer of any Loan Party becoming aware of any event or circumstance which could reasonably be expected to have a Material Adverse Effect; or

(c)    Promptly after any Responsible Officer of any Loan Party becoming aware of any pending or threatened action, suit, or proceeding, by any Person, or any pending or threatened investigation by a Governmental Authority, which could reasonably be expected to have a Material Adverse Effect.

Each notice given under this Section 5.3 shall describe the subject matter thereof in reasonable detail, and shall set forth the action that the Loan Party, its Subsidiary, or any ERISA Affiliate, as applicable, has taken or proposes to take with respect thereto.

ARTICLE VI

GENERAL WARRANTIES AND REPRESENTATIONS

The Borrower warrants and represents to the Agent and the Lenders that except as hereafter disclosed to and accepted by the Agent and the Required Lenders in writing:

SECTION 6.1Authorization, Validity, and Enforceability of this Agreement and the Loan Documents. Each Loan Party has the power and authority to execute, deliver, and perform this Agreement and the other Loan Documents to which it is a party, to incur the Obligations, and to grant to the Agent’s Liens upon and security interests in the Collateral. Each Loan Party has taken all necessary action (including obtaining approval of its stockholders if necessary) to authorize its execution, delivery, and performance of this Agreement and the other Loan Documents to which it is a party. This Agreement and the other Loan Documents to which it is a party have been duly executed and delivered by each Loan Party, and constitute the legal, valid, and binding obligations of each Loan Party, enforceable against each such Loan Party in accordance with their respective terms except as enforceability may be limited by the Federal Bankruptcy Code or by any other state or federal bankruptcy or insolvency act or law and general principles of equity. Each Loan Party’s execution, delivery, and performance of this Agreement and the other Loan

10

Documents to which it is a party do not and will not conflict with, or constitute a violation or breach of, or result in the imposition of any Lien (other than in favor of the Agent) upon the property of such Loan Party, by reason of the terms of (a) any contract, mortgage, lease, material agreement, indenture, or instrument to which such Loan Party is a party or which is binding upon it, (b) any Requirement of Law applicable to such Loan Party, or (c) the certificate or articles of incorporation or by-laws or the limited liability company or limited partnership agreement of such Loan Party.

SECTION 6.2Validity and Priority of Security Interest. The provisions of this Agreement, the Collateral Documents, and the other Loan Documents create legal and valid Liens on all the Collateral in favor of the Agent, for the ratable benefit of the Agent and the Lenders, and, upon the filing of all applicable financing statements against the Loan Parties (to the extent such filing is relevant), such Liens shall constitute valid, enforceable, perfected and continuing Liens on all the Collateral, having priority over all other Liens on the Collateral, except for those Liens identified in clauses (a) through (d) of the definition of Permitted Liens securing all the Obligations, and enforceable against each Loan Party.

SECTION 6.3Organization and Qualification. Each Loan Party (a) is duly organized or incorporated and, where applicable, validly existing in good standing under the laws of the state of its organization or incorporation, (b) is qualified to do business and, where applicable, is in good standing in the jurisdictions in which qualification is necessary in order for it to own or lease its property and conduct its business, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect, and (c) has all requisite power and authority to conduct its business and to own its property.

SECTION 6.4Corporate Name; Prior Transactions. Except as set forth on Schedule 6.4or as otherwise notified by the Borrower to the Agent, no Loan Party has, during the past five (5) years, been known by or used any other corporate or fictitious name, or been a party to any merger or consolidation, or acquired all or substantially all of the assets of any Person, or acquired any of its property outside of the ordinary course of business.

SECTION 6.5Subsidiaries and Affiliates. Except as otherwise notified by the Borrower to the Agent, Schedule 6.5 is a correct and complete list of the name and relationship to each Loan Party of each and all of its Subsidiaries. All of the Foreign Subsidiaries of Westlake, as of the Closing Date, are owned, directly or indirectly, by the Loan Parties.

SECTION 6.6Financial Statements and Projections. The Borrower has delivered to the Agent and the Lenders such balance sheet and related statements of income, retained earnings, cash flows, and changes in stockholders equity that cover the Loan Parties and are available prior to the Closing Date.

SECTION 6.7Solvency. On the Closing Date, the Borrower is (and after giving effect to the transactions contemplated by the Loan Documents will be), on a consolidated basis, Solvent.

SECTION 6.8Litigation. Except as set forth on Schedule 6.11, there is no pending, or to the best of any Loan Party’s knowledge threatened, action, suit, proceeding, or counterclaim by any Person against any Loan Party, or to the best of any Loan Party’s knowledge, investigation by any Governmental Authority, or any basis for any of the foregoing, which could reasonably be expected to have a Material Adverse Effect.

SECTION 6.9No Violation of Law. Neither any Loan Party nor any of their Subsidiaries is in violation of any Requirement of Law applicable to it which violation could reasonably be expected to have a Material Adverse Effect.

SECTION 6.10No Default. No Loan Party is in default with respect to any note, indenture, loan agreement, mortgage, lease, deed, or other agreement to which such Person is a party or by which it is bound, which default could reasonably be expected to have a Material Adverse Effect.

SECTION 6.11Taxes. The Loan Parties and their Subsidiaries have filed all federal and, except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, other tax returns and tax reports required to be filed (or appropriate extensions have been timely filed), and have paid all federal and other taxes, assessments, fees and other governmental charges levied or imposed upon them or their properties, income or assets otherwise due and payable, except where such nonpayment would not constitute a breach of Section 7.1(b).

SECTION 6.12Regulated Entities. No Loan Party is an “Investment Company”within the meaning of the Investment Company Act of 1940. No Loan Party is a regulated entity under federal or state statute or regulation limiting its ability to incur the Obligations.

11

SECTION 6.13Use of Proceeds; Margin Regulations. The proceeds of any Borrowing are to be used solely (a) to pay the costs and expenses related to this Agreement, (b) for working capital purposes of the Loan Parties, (c) for general corporate purposes, including acquisitions permitted under this Agreement and (d) to finance a return of capital to Westlake, which transfer shall be directly or indirectly through its Subsidiaries, which Westlake will use to partially fund its proposed acquisition of Axiall Corporation. None of such proceeds will be used for the purpose of purchasing or carrying any Margin Stock or for any other purpose in violation of Regulation X. Following the application of the proceeds of each Borrowing, not more than 25% of the value of the assets (either of any individual Borrower or of the Loan Parties on a consolidated basis) subject to the provisions of Sections 7.5, 7.12 or 7.18 or subject to any restriction contained in any agreement or instrument between the Borrower and any Lender or any Affiliate of any Lender relating to Debt and within the scope of Section 9.1(d) will be Margin Stock.

SECTION 6.14No Material Adverse Change. No Material Adverse Effect has occurred since the latest date of the Financial Statements delivered to the Lenders.

SECTION 6.15Full Disclosure. None of the representations or warranties (other than as to estimates, projections, and pro forma Financial Statements) made by any Loan Party in the Loan Documents as of the date such representations and warranties are made or deemed made, and none of the statements contained in any exhibit, report, statement or certificate furnished by or on behalf of any Loan Party in connection with the Loan Documents (including the offering and disclosure materials delivered by or on behalf of the Loan Parties to the Lenders prior to the Closing Date), contains any untrue statement of a material fact or omits any material fact required to be stated therein or necessary to make the statements made therein, in light of the circumstances under which they are made, not materially misleading as of the time when made or delivered. Any estimates, projections, and pro forma Financial Statements delivered to the Agent or the Lenders were prepared in good faith based on assumptions believed to be reasonable at the time.

SECTION 6.16Governmental Authorization. No approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any Governmental Authority or other Person is necessary or required in connection with (a) the execution or delivery by, or enforcement against, any Loan Party of this Agreement or any other Loan Document or (b) the borrowing and repayment of the Loans or the granting and maintenance of Liens in the Collateral, other than (i) those already obtained and (ii) the filing of UCC financing statements.

SECTION 6.17OFAC. No Loan Party, no Subsidiary or, to the knowledge of any Loan Party or any Subsidiary thereof, or any director, officer, employee, agent, affiliate or representative thereof, is a Sanctioned Person. No Loan Party or Subsidiary is located, organized or resident in a Sanctioned Country. Each Loan Party and its Subsidiaries have instituted and maintained policies and procedures designed to promote and achieve compliance by such Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with applicable Sanctions in all material respects. No Borrowing or use of proceeds by any Loan Party or any Subsidiary thereof or other transaction contemplated by this Agreement will knowingly result in a violation by any Loan Party or any Subsidiary thereof of applicable Sanctions at the time of such transactions.

SECTION 6.18Anti-Corruption Laws. Each Loan Party and its Subsidiaries have conducted their businesses in compliance with applicable Anti-Corruption Laws in all material respects and have instituted and maintained policies and procedures designed to promote and achieve compliance by such Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with applicable Anti-Corruption Laws in all material respects. Each Loan Party, its Subsidiaries and, to the knowledge of such Loan Party or such Subsidiaries, its directors, officers, employees and agents, are in compliance with applicable Anti-Corruption Laws in all material respects. No Borrowing, use of proceeds by any Loan Party or any Subsidiary thereof, or other transaction contemplated by this Agreement will knowingly result in a violation by any Loan Party or any Subsidiary thereof of any Anti-Corruption Law applicable to such Loan Party or Subsidiary at the time of such transaction.

ARTICLE VII

AFFIRMATIVE AND NEGATIVE COVENANTS

The Borrower covenants to the Agent and each Lender that so long as any of the Obligations (other than contingent indemnity and expense reimbursement claims not then due) remain outstanding or this Agreement is in effect:

SECTION 7.1Taxes and Other Obligations. Except to the extent that a failure to do so could not reasonably be expected to have a Material Adverse Effect, the Borrower shall, and shall cause each of its Subsidiaries

12

to, (a) file prior to delinquency all tax returns and other tax reports which it is required to file; and (b) pay, or provide for the payment, when due, of all taxes, fees, assessments and other governmental charges against it or upon its property, income and franchises, make all required withholding and other tax deposits, and establish adequate reserves or other provision required by accounting principles applicable to the Borrower for the payment of all such items, and provide to the Agent and the Lenders, upon request, satisfactory evidence of its timely compliance with the foregoing. Notwithstanding the foregoing, the failure of a Loan Party or any of its Subsidiaries to comply with the foregoing shall not constitute a breach of this Section 7.1 if (i) such amounts are not yet due and payable; or (ii) (A) such Loan Party is contesting such taxes, fees, assessments, or governmental charges in good faith by appropriate proceedings diligently pursued, (B) such Loan Party has established proper reserves as required under GAAP, and (C) the nonpayment of such amounts does not result in the imposition of a Lien (other than a Permitted Lien).

SECTION 7.2Legal Existence and Good Standing. Except as permitted by Section 7.5, the Borrower shall, and shall cause each Loan Party to, maintain its legal existence and its qualification and, where applicable, good standing in all jurisdictions in which the failure to maintain such existence and qualification or good standing could reasonably be expected to have a Material Adverse Effect. The foregoing shall not restrict any merger, consolidation, wind-up, liquidation or dissolution permitted by Section 7.5.

SECTION 7.3Compliance with Law and Agreements; Maintenance of Licenses; Amendments to Charter Documents. The Borrower shall comply, and shall cause each of its Subsidiaries to comply, in all material respects, with all Requirements of Law of any Governmental Authority having jurisdiction over it or its business (including all Environmental Laws), except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. The Borrower shall, and shall cause each Loan Party to, maintain in effect and enforce policies and procedures designed to ensure compliance by each Loan Party, its Subsidiaries and their respective directors, officers, employees and agents with Anti-Corruption Laws and applicable Sanctions in all material respects. The Borrower shall not violate, and shall ensure that no other Loan Party violates, the provisions of any Material Agreement, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. The Borrower shall, and shall cause each of its Subsidiaries to, obtain and maintain all licenses, permits, franchises, and governmental authorizations necessary to own its property and to conduct its business as conducted on the Closing Date, except to the extent that the failure to do so could not reasonably be expected to have a Material Adverse Effect. No Loan Party shall modify, amend, or alter its certificate or articles of incorporation, or its limited liability company operating agreement or limited partnership agreement, as applicable, other than in a manner which does not materially and adversely affect the rights of the Lenders or the Agent.

SECTION 7.4Insurance. The Borrower shall maintain, and shall cause each of its Subsidiaries to maintain, insurance for such entities as was in effect as of the Closing Date, except to the extent that the failure to do so would not reasonably be expected to have a Material Adverse Effect.

SECTION 7.5Mergers; Consolidations; or Sales. The Borrower shall not, and shall not permit any of its Subsidiaries to, enter into any transaction of merger or consolidation or transfer, sell, or otherwise dispose of all or substantially all of its property, except:

(i)    Distributions permitted by Section 7.6; and

(ii)    the merger, consolidation or transfer of assets of a Subsidiary into (i) the Borrower (provided that the Borrower is the survivor), or (ii) another Subsidiary (provided that if such transaction involves a Loan Party, such Loan Party shall be the survivor).

SECTION 7.6Distributions. The Borrower shall not, and shall not permit any Subsidiary to, directly or indirectly declare or make, or incur any liability to make, any Distribution, except (i) Distributions of the proceeds of Loans consistent with Section 6.13, (ii) each Subsidiary may make Distributions to the Borrower and any Subsidiaries of the Borrower and (iii) to the extent immediately before and after giving effect to such Distribution no Default or Event of Default shall have occurred and be continuing in respect of Section 7.14.

SECTION 7.7Transactions Affecting Collateral or Obligations. The Borrower shall not, and shall not permit any of its Subsidiaries to, enter into any transaction which would be reasonably expected to have a Material Adverse Effect. The Borrower shall not, and shall not permit any of its Subsidiaries to, enter into any transaction as a result of which any of the Foreign Subsidiaries of Westlake, as of the Closing Date, are owned, directly or indirectly, by any entity other than the Loan Parties, in each case subject to Section 7.5.

SECTION 7.8Debt. The Borrower shall not, and shall not permit any Subsidiary to incur or maintain any Debt, other than:

13

(a)    the Obligations;

(b)    Debt existing on the Closing Date and described on Schedule 7.8;

(c)    Guaranties existing on the Closing Date and otherwise in the ordinary course of business;

(d)    Debt incurred by any Subsidiary in the ordinary course of business (as conducted as of the date hereof);

(e)    Debt incurred by any Subsidiary owed to any other Subsidiary or the Borrower; and

(f)    Debt, other than those in clauses (a) through (e) above, whether unsecured or secured by Liens on assets not constituting Collateral, in the aggregate principal amount outstanding at any time not to exceed 15% of Tangible Assets (measured as of the date of the most recent Financial Statements delivered hereunder prior to such incurrence); provided that immediately before and after giving effect thereto no Default or Event of Default shall have occurred and be continuing in respect of Section 7.14.

SECTION 7.9Payment / Prepayment of Debt. The Borrower shall not, and shall not permit any Loan Party to, voluntarily prepay any principal of, or interest on, any other Debt except (i) the Obligations in accordance with the terms of this Agreement, (ii) Indebtedness owed to any Loan Party, (iii) payment of regularly scheduled interest and principal payments as and when due in respect of any Indebtedness permitted by Section 7.8 and (iv) any payment to the extent immediately before and after giving effect thereto no Default or Event of Default shall have occurred and be continuing in respect of Section 7.14.

SECTION 7.10Transactions with Affiliates. Except as set forth below, the Borrower shall not, and shall not permit any Subsidiary to, shall sell, transfer, distribute, or pay any money or property, including, but not limited to, any fees or expenses of any nature (including, but not limited to, any fees or expenses for management services), to any Affiliate, or lend or advance money or property to any Affiliate, or invest in (by capital contribution or otherwise) or purchase or repurchase any stock or indebtedness, or any property, of any Affiliate, or become liable on any Guaranty of the indebtedness, dividends, or other obligations of any Affiliate other than (a) as permitted by Section 7.5, (b) transactions between the Loan Parties and/or the Subsidiaries on terms of the kind customarily employed to allocate charges among members of a consolidated group of entities, in each such case, that are fair and reasonable to the Loan Parties and/or the Subsidiaries and consistent with past practices of the Loan Parties and/or the Subsidiaries, and (c) (i) transactions with respect to tax sharing agreements that became effective prior to the date hereof, and (ii) transactions with respect to tax sharing agreements that became effective on or after the date hereof so long as (x) the Loan Parties do not pay more taxes in the aggregate pursuant to such tax sharing agreement described in this clause (ii) than the Loan Parties in the aggregate would be required to pay if each Loan Party filed a separate tax return, or (y) the tax sharing agreement described in this clause (ii) replaces a prior tax sharing agreement and the Loan Parties do not pay more taxes in the aggregate pursuant to the tax sharing agreement than the Loan Parties would have paid in the aggregate under such prior tax sharing agreement. Notwithstanding the foregoing, while no Event of Default has occurred and is continuing and so long as otherwise permitted in this Agreement, the Loan Parties and their Subsidiaries may engage in transactions with Affiliates in amounts and on terms no less favorable to the Loan Parties and their Subsidiaries than would be obtained in a comparable arm’s-length transaction with a third party who is not an Affiliate; provided that the foregoing restrictions shall not apply to:

(i)    any Distribution or transaction permitted by Sections 7.5 or 7.6;

(ii)    any transactions between or among any Loan Parties;

(iii)    payment of reasonable directors’ fees to Persons who are not otherwise Affiliates of the Borrower;

(iv)    transactions between the Borrower or any of its Subsidiaries and any other Person, a director of which is also on the Board of Directors of Westlake or any direct or indirect parent company of Westlake, and such common director is the sole cause for such other Person to be deemed an Affiliate of the Borrower or any of its Subsidiaries; provided, however, that such director abstains from voting as a member of the Board of Directors of Westlake or any direct or indirect parent company of Westlake, as the case may be, on any transaction with such other Person; and

(v)    transactions entered into by a Person prior to the time such Person becomes a Subsidiary or is merged or consolidated into the Borrower or a Subsidiary (provided such transaction

14

is not entered into in contemplation of such merger or consolidation and is not otherwise prohibited by this Agreement);

provided that the transactions described in clauses (ii) and (vii) above shall be on terms no less favorable to the Loan Parties and their Subsidiaries than would be obtained in a comparable arm’s-length transaction with a third party who is not an Affiliate.

SECTION 7.11Business Conducted. The Borrower shall not, and shall not permit any Subsidiary to, directly or indirectly, permit or suffer to exist any material change in the type of businesses in which it is engaged from the businesses of the Loan Parties and their Subsidiaries as conducted on the Closing Date and in similar or related businesses that are reasonable extensions or additions to the Loan Parties’ and their Subsidiaries’ business on the Closing Date.

SECTION 7.12Liens. The Borrower shall not, and shall not permit any of other Loan Party to, create, incur, assume, or permit to exist any Lien on any property now owned or hereafter acquired by any of them, except Permitted Liens.

SECTION 7.13Fiscal Year. The Borrower shall not, and shall not permit any Loan Party to, change its Fiscal Year or make any material change in accounting policies or financial reporting practices by any Loan Party or any Subsidiary thereof.

SECTION 7.14Financial Covenant. The Borrower and its Subsidiaries shall at all times maintain unencumbered cash and cash equivalents in a Dollar Equivalent of not less than $150,000,000, of which (a) for the period from the date hereof until the date 30 days after the Closing Date, not less than $50,000,000 and (b) thereafter, not less than $75,000,000 shall be maintained in accounts at Bank of America in accordance with existing cash management agreements; provided that to the extent any such cash or cash equivalents are denominated in a currency other than Dollars, the Dollar Equivalent of such non-Dollar cash or cash equivalents shall be deemed to be reduced by 5%. As used in this Section, “Dollar Equivalent” means, at any time, (a) with respect to any amount denominated in Dollars, such amount, and (b) with respect to any amount denominated in any other currency, the equivalent amount thereof in Dollars as determined by the Agent at such time on the basis of the Spot Rate for the purchase of Dollars with such other currency; and “Spot Rate” for a currency means the rate determined by the Agent to be the rate quoted by the Agent as the spot rate for the purchase by the Agent of such currency with another currency through its principal foreign exchange trading office at approximately 11:00 a.m. on the date two Business Days prior to the date as of which the foreign exchange computation is made; providedthat the Agent may obtain such spot rate from another financial institution designated by the Agent if the Agent does not have as of the date of determination a spot buying rate for any such currency.

SECTION 7.15Use of Proceeds. The Borrower shall not, and shall not permit any Subsidiary to, use any portion of the Loan proceeds, directly or indirectly, to purchase or carry any Margin Stock or to extend credit for the purpose of purchasing or carrying any Margin Stock, in each case, in violation of Regulation U of the Federal Reserve Board. The Borrower shall not request any Borrowing, or use or permit any use of the proceeds of any Borrowing (i) in furtherance of an offer, payment, promise to pay, or authorization of the payment or giving of money, or anything else of value, to any Person in violation of any Anti-Corruption Laws applicable to such Borrower or Subsidiary, (ii) for the purpose of funding, financing or facilitating any activities, business or transaction of or with, to its knowledge, any Sanctioned Person, or in any Sanctioned Country, unless such activities, business or transactions are specifically permitted by the applicable Governmental Authority, or (iii) in any manner that would result in the violation by any Loan Party or any Subsidiary thereof of any Sanctions applicable to such Loan Party or such Subsidiary.

SECTION 7.16Collateral. To secure the full and complete payment and performance of the Obligations, the Borrower shall, and shall cause the other Loan Parties to, enter into Collateral Documents pursuant to which, among other things, each such entity shall, to the extent permitted by applicable law and required under the Collateral Documents, grant, pledge, assign, and create first priority Liens constituting the Agent’s Liens in and to all Collateral owned by such entity subject to those Liens identified in clauses (a) through (d) of the definition of Permitted Liens.

SECTION 7.17Further Assurances. The Borrower shall, and shall cause the other Loan Parties to, execute and deliver, or cause to be executed and delivered, to the Agent and/or any Lender such documents and agreements, and shall take or cause to be taken such actions, as the Agent may, from time to time, reasonably request to carry out the terms and conditions of this Agreement and the other Loan Documents.

15

SECTION 7.18Burdensome Agreements. The Borrower shall not, and shall not permit any of its Subsidiaries to, enter into or permit to exist any contractual obligation (other than this Agreement or any other Loan Document) that (a) limits the ability (i) of any Subsidiary to make Distributions to the Borrower or to otherwise transfer property to or invest in the Borrower, except for any agreement in effect at the time any Subsidiary becomes a Subsidiary of the Borrower, so long as such agreement was not entered into solely in contemplation of such Person becoming a Subsidiary of the Borrower, (ii) of any Subsidiary to Guaranty the Obligations of the Borrower or (iii) of the Borrower or any Subsidiary to create, incur, assume or suffer to exist Liens on property of such Person; provided, however, that this clause (iii) shall not prohibit any negative pledge incurred or provided in favor of any holder of Debt permitted under Section 7.8 solely to the extent any such negative pledge relates to the property financed by or the subject of such Debt; or (b) requires the grant of a Lien to secure an obligation of such Person if a Lien is granted to secure another obligation of such Person.

ARTICLE VIII

CONDITIONS OF LENDING

SECTION 8.1Conditions Precedent to Making of Loans on the Closing Date. The obligation of the Lenders to make the Loans on the Closing Date are subject to the following conditions precedent having been satisfied in a manner satisfactory to the Agent and each Lender:

(a)    This Agreement and the other Loan Documents shall have been executed by each party thereto and each Loan Party, as applicable, shall have performed and complied with all covenants, agreements, and conditions contained herein and the other Loan Documents which are required to be performed or complied with by the Loan Parties before or on such Closing Date.

(b)    All representations and warranties made hereunder and in the other Loan Documents shall be true and correct in all material respects as if made on such date.

(c)    No Default or Event of Default shall have occurred and be continuing after giving effect to the Loans to be made on the Closing Date.

(d)    The Agent and the Lenders shall have received such opinions of counsel for the Loan Parties as the Agent or any Lender shall request, each such opinion to be in a form, scope, and substance reasonably satisfactory to the Agent, the Lenders, and their respective counsel.

(e)    The Agent shall have received financing statements or amendments in proper form for filing, under the UCC in all jurisdictions that the Agent may deem necessary or desirable in order to perfect the Agent’s Liens.

(f)    The Borrower shall have paid all fees, including the amounts owing as of the Closing Date under the Engagement Letter, and expenses of the Agent and the Attorney Costs incurred in connection with any of the Loan Documents and the transactions contemplated thereby to the extent invoiced.

(g)    All proceedings taken in connection with the execution of this Agreement, the Notes, all other Loan Documents, and all documents and papers relating thereto shall be satisfactory in form, scope, and substance to the Agent and the Lenders.

(h)    Since December 31, 2015, no event has occurred and is continuing, or would result from such extension of credit, which has had or would (after giving effect thereto) reasonably be expected to have a Material Adverse Effect.

(i)    The Agent shall have received, each in form and substance satisfactory to the Agent, the Financial Statements.

(j)    Evidence satisfactory to the Lenders that no approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any Governmental Authority or other Person is necessary or required in connection with the execution, delivery or performance by, or enforcement against, any Loan Party of this Agreement or any other Loan Document other than (i) those already obtained and (ii) the filing of UCC financing statements.

16

(k)    Without limiting the generality of the items described above, each Loan Party shall have delivered or caused to be delivered to the Agent (in form and substance reasonably satisfactory to the Agent), the financial statements, instruments, resolutions, documents, agreements, certificates, opinions, and other items set forth on the “Closing Checklist”delivered by the Agent to the Borrower prior to the Closing Date.

The acceptance by the Borrower of any Loans made on the Closing Date shall be deemed to be a representation and warranty made by the Borrower to the effect that all of the conditions precedent to the making of such Loans have been satisfied or waived, with the same effect as delivery to the Agent and the Lenders of a certificate signed by a Responsible Officer on behalf of the Borrower, dated the Closing Date, to such effect.

Execution and delivery to the Agent by a Lender of a counterpart of this Agreement shall be deemed confirmation by such Lender that (i) all conditions precedent in this Section 8.1 have been fulfilled to the satisfaction of such Lender, (ii) the decision of such Lender to execute and deliver to the Agent an executed counterpart of this Agreement was made by such Lender independently and without reliance on the Agent or any other Lender as to the satisfaction of any condition precedent set forth in this Section 8.1, and (iii) all documents sent to such Lender for approval consent, or satisfaction were acceptable to such Lender, unless the Agent shall have received notice from such Lender prior to the proposed Closing Date specifying its objection with respect to the foregoing clause (i), (ii), or (iii).

ARTICLE IX

DEFAULT; REMEDIES

SECTION 9.1Events of Default. It shall constitute an event of default (“Event of Default”) if any one or more of the following shall occur for any reason:

(a)    any failure or refusal by the Borrower to pay (i) any principal of the Obligations when the same becomes due (whether by its terms, by acceleration, or as otherwise provided in the Loan Documents); (ii) interest or fees within five Business Days after the same becomes due and payable in accordance with the Loan Documents, whether upon demand or otherwise or (iii) any other amount within five Business Days after notice from the Agent to the Borrower;

(b)    any representation or warranty made or deemed made by any Loan Party in this Agreement or in any of the other Loan Documents, any Financial Statement, or any certificate furnished by any Loan Party at any time to the Agent or any Lender shall prove to be untrue in any material respect as of the date on which made, deemed made, or furnished;

(c)    (i) any default shall occur in the observance or performance of any of the covenants and agreements contained in Sections 7.2 (as to existence only), 7.5 through 7.18, (ii) any default shall occur in the observance or performance of any of the covenants and agreements contained in Sections 5.3 and such default shall continue for five (5) days or more, provided that there are not more than, in the aggregate, three (3) occurrences of any such default in any twelve (12) month period; or (iii) any default shall occur in the observance or performance of any of the other covenants or agreements (not specified in Sections 9.1(a), (b), (c)(i), or (c)(ii)) contained in any other Section of this Agreement or any other Loan Document and such default shall continue for thirty (30) days or more or (iv) any default shall occur under Section 5.2 and such default shall continue for 5 Business Days or more;

(d)    any “default”or “event of default”shall occur with respect to any Debt (other than the Obligations) of any Loan Party in an outstanding principal amount which exceeds $20,000,000 (in the aggregate), or under any agreement or instrument under or pursuant to which any such Debt may have been issued, created, assumed, or guaranteed by any Loan Party, and such default shall continue for more than the period of grace, if any, therein specified, if the effect thereof (with or without the giving of notice or further lapse of time or both) is to accelerate, or to permit the holders of any such Debt to accelerate, the maturity of any such Debt; or any such Debt shall be declared due and payable or be required to be prepaid prior to the stated maturity or redemption date thereof; provided that this clause (d) shall not apply to secured Debt that becomes due as a result of the voluntary sale or transfer of the property or assets securing such Debt, if such sale or transfer is permitted hereunder and under the documents providing for such Debt;

(e)    (i) any Loan Party shall (A) file a voluntary petition in bankruptcy or file a voluntary petition or an answer or otherwise commence any action or proceeding seeking reorganization, arrangement, or readjustment of its debts or for any other relief under the federal Bankruptcy Code, as amended, or under any

17

other bankruptcy or insolvency act or law, state or federal, now or hereafter existing, or consent to, approve of, or acquiesce in, any such petition, action, or proceeding; (B) apply for or acquiesce in the appointment of a receiver, assignee, liquidator, sequestrator, custodian, monitor, trustee or similar officer for it or for all or any part of its property; (C) make an assignment for the benefit of creditors; or (D) be unable generally to pay its debts as they become due;;

(f)    an involuntary petition shall be filed or an action or proceeding otherwise commenced seeking reorganization, arrangement, consolidation or readjustment of the debts of any Loan Party or for any other relief under the federal Bankruptcy Code, as amended, or under any other bankruptcy or insolvency act or law, state or federal, now or hereafter existing and such petition or proceeding shall not be dismissed within sixty (60) days after the filing or commencement thereof; or an order of relief shall be entered with respect thereto;

(g)    a receiver, assignee, liquidator, sequestrator, custodian, monitor, trustee or similar officer for any Loan Party or for all or any part of their respective property shall be appointed or a warrant of attachment, execution, or similar process shall be issued against any part of the property of the Borrower and such appointment, warrant, execution or other similar process shall continue for (60) days thereafter;

(h)    any Loan Party shall file a certificate of dissolution under applicable state law or shall be liquidated, dissolved or wound-up or shall commence or have commenced against it any action or proceeding for dissolution, winding-up or liquidation, or shall take any corporate action in furtherance thereof except as permitted under Sections 7.2 or 7.5;

(i)    all or any material part of the property of any Loan Party shall be nationalized, expropriated, or condemned, seized, or otherwise appropriated, or custody or control of such property or of such Loan Party shall be assumed by any Governmental Authority or any court of competent jurisdiction at the instance of any Governmental Authority, except where contested in good faith by proper proceedings diligently pursued where a stay of enforcement is in effect;

(j)    any Loan Document shall be terminated, revoked, or declared void, invalid, or unenforceable or challenged by any Loan Party or any other obligor;

(k)    one or more final judgments, orders, decrees, or arbitration awards is entered against the Loan Parties involving in the aggregate liability (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage) as to any single or related or unrelated series of transactions, incidents or conditions, of $20,000,000 or more, and either (i) enforcement proceedings are commenced upon such judgment, order, decree, or award, or (iii) there is a period of 30 consecutive days during which the same shall remain undischarged, unsatisfied or a stay of enforcement of such judgment, order, decree, or award, by reason of pending appeal or otherwise, is not in effect;

(l)    for any reason other than the failure of the Agent to take any action available to it to maintain perfection of the Agent’s Liens, pursuant to the Loan Documents, any Loan Document ceases to be in full force and effect or any Lien with respect to any material portion of the Collateral intended to be secured thereby ceases to be, or is not, valid, perfected, and prior to all other Liens (other than Permitted Liens) or is terminated, revoked, or declared void;

(m)    (i) an ERISA Event shall occur with respect to a Pension Plan or Multi-employer Plan which has resulted or could reasonably be expected to result in liability of any Loan Party under Title IV of ERISA to the PBGC in an aggregate amount in excess of $15,000,000; or (ii) any Loan Party or any ERISA Affiliate shall fail to pay when due, after the expiration of any applicable grace period, any installment payment with respect to its withdrawal liability under Section 4201 of ERISA under a Multi-employer Plan in an aggregate amount in excess of $15,000,000; or

(n)    there occurs a Change of Control.

SECTION 9.2Remedies.

(a)    If an Event of Default has occurred and is continuing, the Agent shall, at the direction of the Required Lenders, do one or more of the following, in addition to the actions described in the preceding sentence, at any time or times and in any order, with notice to the Borrower: (A) terminate the Commitments and this Agreement; (B) declare any or all Obligations to be immediately due and payable; provided, however, that upon the occurrence of

18

any Event of Default described in Sections 9.1(e), 9.1(f), 9.1(g), or 9.1(h), in each case, solely in respect of the Borrower, the Commitments shall automatically and immediately expire and all Obligations shall automatically become immediately due and payable without notice or demand of any kind; and (C) pursue its other rights and remedies under the Loan Documents and applicable law.

(b)    If an Event of Default has occurred and is continuing: (i) the Agent shall have for the benefit of the Lenders, in addition to all other rights of the Agent and the Lenders, the rights and remedies of a secured party under the Loan Documents and the UCC; and (ii) the Agent may sell and deliver any Collateral at public or private sales, for cash, upon credit or otherwise, at such prices and upon such terms as the Agent deems advisable, in its sole discretion, and may, if the Agent deems it reasonable, postpone or adjourn any sale of the Collateral by an announcement at the time and place of sale or of such postponed or adjourned sale without giving a new notice of sale. Without in any way requiring notice to be given in the following manner, the Loan Parties agree that any notice by the Agent of sale, disposition, or other intended action hereunder or in connection herewith, whether required by the UCC or otherwise, shall constitute reasonable notice to such Loan Party if such notice is mailed by registered or certified mail, return receipt requested, postage prepaid, or is delivered personally against receipt, at least ten (10) Business Days prior to such action to the Borrower’s address specified in or pursuant to Section 13.8. If any Collateral is sold on terms other than payment in full at the time of sale, no credit shall be given against the Obligations until the Agent or the Lenders receive payment, and if the buyer defaults in payment, the Agent may resell the Collateral without further notice to any Loan Party. In the event the Agent seeks to take possession of all or any portion of the Collateral by judicial process, the Loan Parties irrevocably waive to the extent permitted under applicable Law: (A) the posting of any bond, surety, or security with respect thereto which might otherwise be required; (B) any demand for possession prior to the commencement of any suit or action to recover the Collateral; and (C) any requirement that the Agent retain possession and not dispose of any Collateral until after trial or final judgment. The Loan Parties agree that the Agent has no obligation to preserve rights to the Collateral or marshal any Collateral for the benefit of any Person. The proceeds of sale shall be applied first to all expenses of sale, including attorneys’ fees, and then to the Obligations. The Agent will return any excess to the Borrower and the Borrower shall remain liable for any deficiency.

ARTICLE X

TERM AND TERMINATION

SECTION 10.1Term and Termination. The term of this Agreement shall end on the Stated Maturity Date unless sooner terminated in accordance with the terms hereof. The Agent upon direction from the Required Lenders may terminate this Agreement with notice upon the occurrence and during the continuance of an Event of Default. Upon the effective date of termination of this Agreement for any reason whatsoever, all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination) shall become immediately due and payable, and the Borrower shall immediately make Full Payment of all such Obligations. Notwithstanding the termination of this Agreement, until the Agent has received Full Payment of all Obligations (including all unpaid principal and accrued but unpaid interest, but excluding indemnity obligations that survive the termination of this Agreement and are not due and payable at such termination), the Borrower shall remain bound by the terms of this Agreement and shall not be relieved of any of its Obligations hereunder or under any other Loan Document, and the Agent and the Lenders shall retain all their rights and remedies hereunder (including the Agent’s Liens in and all rights and remedies with respect to all then existing and after-arising Collateral).

ARTICLE XI

AMENDMENTS; WAIVERS; PARTICIPATIONS; ASSIGNMENTS; SUCCESSORS

SECTION 11.1Amendments and Waivers.

(a)    No amendment or waiver of any provision of this Agreement or any other Loan Document, and no consent with respect to any departure by the Loan Parties therefrom, shall be effective unless the same shall be in writing and signed by the Required Lenders (or by the Agent at the written request of the Required Lenders); and the Borrower and then any such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given; provided, however, that no such waiver, amendment, or consent shall, unless in writing and signed by each Lender (including consent of a Defaulting Lender with respect to clauses (i), (ii), and (iii) below) directly and adversely affected thereby and the Borrower and acknowledged by the Agent, do any of the following:

19

(i)    increase or extend the Commitment of any Lender;

(ii)    postpone or delay any date fixed by this Agreement or any other Loan Document for any payment of principal, interest, fees (other than fees payable solely to the Agent), or other amounts due to the Lenders (or any of them) hereunder or under any other Loan Document;

(iii)    reduce the principal of, or the rate of interest specified herein on any Loan, or any fees or other amounts payable hereunder or under any other Loan Document;

(iv)    change the percentage of the Commitments or of the aggregate unpaid principal amount of the Loans which is required for the Lenders or any of them to take any action hereunder;

(v)    amend this Section, Section 12.11(b) or any provision of this Agreement providing for consent or other action by all Lenders; provided that consent of each Defaulting Lender shall be required to amend clause (i), (ii), or (iii) above;

(vi)    release all or substantially all of the Collateral other than as permitted by Section 12.10;

(vii)    change the definition of “Required Lenders”;

(viii)    change the order of application of payments provisions in Section 3.5; or

(ix)    increase the Facility;

provided, however, that (A) no amendment, waiver, or consent shall, unless in writing and signed by the Agent, affect the rights or duties of the Agent under this Agreement or any other Loan Document; (B) no amendment shall increase the Commitment of any Lender unless consented to by such Lender (including a Defaulting Lender); and (C) Schedule 1.2 hereto (Commitments) may be amended from time to time by the Agent alone to reflect assignments of Commitments in accordance herewith.

(b)    If any fees are paid to the Lenders as consideration for amendments, waivers, or consents with respect to this Agreement, at the Agent’s election, such fees may be paid only to those Lenders that agree to such amendments, waivers or consents within the time specified for submission thereof.

(c)    If, in connection with any proposed amendment, waiver or consent (a “Proposed Change”) requiring the consent of all Lenders, the consent of Required Lenders is obtained, but the consent of other Lenders is not obtained (any such Lender whose consent is not obtained being referred to as a “Non-Consenting Lender”), then, so long as the Agent is not a Non-Consenting Lender, at the Borrower’s request, the Agent or an Eligible Assignee shall have the right (but not the obligation) with the Agent’s approval, to purchase from the Non-Consenting Lenders, and the Non-Consenting Lenders agree that they shall sell, all the Non-Consenting Lenders’ Commitments for an amount equal to the principal balances thereof and all accrued interest and fees with respect thereto through the date of sale pursuant to Assignment and Acceptance, without premium or discount. The Agent is irrevocably appointed as attorney-in-fact to execute any such Assignment and Acceptance if such Lender fails to execute same within twenty (20) days of such request of assignment. Such Lender shall be entitled to receive, in cash, concurrently with such assignment, all amounts owed to it under the Loan Documents, including all principal, interest and fees through the date of assignment (but excluding any prepayment charge).

SECTION 11.2Assignments; Participations.

(a)    Any Lender may, with the written consent of the Agent and the Borrower, which consent shall not be unreasonably withheld, assign and delegate to one or more Eligible Assignees (provided that (i) no consent of the Agent or the Borrower shall be required in connection with any assignment and delegation by a Lender to an Affiliate of such Lender, another Lender or an Approved Fund, (ii) the Borrower shall be deemed to have consented to any such assignment unless it shall object thereto by written notice to the Agent within ten (10) Business Days after having received notice thereof; and (iii) no consent of the Borrower shall be required if an Event of Default has occurred and is continuing at the time of such assignment) (each an “Assignee”) all, or any ratable part of all, of the Loans, the Commitment, and the other rights and obligations of such Lender hereunder, in a minimum amount of $10,000,000, or, if less, all of such Lender’s Commitment (provided that, unless an assignor Lender has assigned and delegated all of its Loans and Commitment, no such assignment and/or delegation shall be permitted unless, after giving effect thereto, such assignor Lender retains a Commitment in a minimum amount of $10,000,000); provided, however, that the Borrower and the Agent may continue to deal solely and directly with such Lender in connection with the interest

20

so assigned to an Assignee until (i) written notice of such assignment, together with payment instructions, addresses and related information with respect to the Assignee, shall have been given to the Borrower and the Agent by such Lender and the Assignee; (ii) such Lender and its Assignee shall have delivered to the Borrower and the Agent an Assignment and Acceptance in the form of Exhibit F or otherwise satisfactory to the Agent (“Assignment and Acceptance”) together with any note or notes, if any, subject to such assignment, and (iii) the assignor Lender or Assignee has paid to the Agent a processing fee in the amount of $3,500. The Borrower agrees to promptly execute and deliver new promissory notes and replacement promissory notes if requested by an Assignee or assignor Lender to evidence assignments of the Loans and Commitments in accordance herewith.

(b)    From and after the date that the Agent notifies the assignor Lender that it has received an executed Assignment and Acceptance (and consent of the Agent thereto, if required) and payment of the above-referenced processing fee, (i) the Assignee thereunder shall be a party hereto and, to the extent that rights and obligations have been assigned to it pursuant to such Assignment and Acceptance, shall have the rights and obligations of a Lender under the Loan Documents (except for such rights and obligations not available to such assignee by express terms of this Agreement), and (ii) the assignor Lender shall, to the extent that rights and obligations hereunder and under the other Loan Documents have been assigned by it pursuant to such Assignment and Acceptance, relinquish its rights and be released from its obligations under this Agreement (and in the case of an Assignment and Acceptance covering all or the remaining portion of an assigning Lender’s rights and obligations under this Agreement, such Lender shall cease to be a party hereto).

(c)    By executing and delivering an Assignment and Acceptance, the assigning Lender thereunder and the Assignee thereunder confirm to and agree with each other and the other parties hereto as follows: (i) other than as provided in such Assignment and Acceptance, such assigning Lender makes no representation or warranty and assumes no responsibility with respect to any statements, warranties, or representations made in or in connection with this Agreement or the execution, legality, validity, enforceability, genuineness, sufficiency, or value of this Agreement or any other Loan Document furnished pursuant hereto or the attachment, perfection, or priority of any Lien granted by any Loan Party to the Agent or any Lender in the Collateral; (ii) such assigning Lender makes no representation or warranty and assumes no responsibility with respect to the financial condition of any Loan Party or the performance or observance by any Loan Party of any of its obligations under this Agreement or any other Loan Document furnished pursuant hereto; (iii) such Assignee confirms that it has received a copy of this Agreement, together with such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into such Assignment and Acceptance; (iv) such Assignee will, independently (without reliance upon the Agent, such assigning Lender, or any other Lender, and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit decisions in taking or not taking action under this Agreement; (v) such Assignee appoints and authorizes the Agent to take such action as agent on its behalf and to exercise such powers under this Agreement as are delegated to the Agent by the terms hereof, together with such powers, including the discretionary rights and incidental power, as are reasonably incidental thereto; and (vi) such Assignee agrees that it will perform in accordance with their terms all of the obligations which by the terms of this Agreement are required to be performed by it as a Lender.

(d)    Immediately upon satisfaction of the requirements of Section 11.2(a), this Agreement shall be deemed to be amended to the extent, but only to the extent, necessary to reflect the addition of the Assignee and the resulting adjustment of the Commitments arising therefrom. The Commitment allocated to each Assignee shall reduce such Commitments of the assigning Lender pro tanto.

(e)    Any Lender may at any time sell to one or more commercial banks, financial institutions, or other Persons not Affiliates of the Borrower (a “Participant”) participating interests in any Loans, the Commitment of that Lender and the other interests of that Lender (the “Originating Lender”) hereunder and under the other Loan Documents; provided, however, that (i) the Originating Lender’s obligations under this Agreement shall remain unchanged; (ii) the Originating Lender shall remain solely responsible for the performance of such obligations; (iii) the Borrower and the Agent shall continue to deal solely and directly with the Originating Lender in connection with the Originating Lender’s rights and obligations under this Agreement and the other Loan Documents; and (iv) no Lender shall transfer or grant any participating interest under which the Participant has rights to approve any amendment to, or any consent or waiver with respect to, this Agreement or any other Loan Document, except the matters set forth in Section 11.1(a)(i), (ii), and (iii), and all amounts payable by the Loan Parties hereunder shall be determined as if such Lender had not sold such participation; except that, if amounts outstanding under this Agreement are due and unpaid, or shall have become due and payable upon the occurrence of an Event of Default, each Participant shall be deemed to have the right of set off in respect of its participating interest in amounts owing under this Agreement to the same

21

extent and subject to the same limitation as if the amount of its participating interest were owing directly to it as a Lender under this Agreement.

(f)    Notwithstanding any other provision in this Agreement, any Lender may at any time create a security interest in, or pledge, all or any portion of its rights under and interest in this Agreement in favor of any Federal Reserve Bank in accordance with Regulation A of the FRB or U.S. Treasury Regulation 31 CFR §203.14, or any other central bank having jurisdiction over such Lender, and such Federal Reserve Bank or other central bank having jurisdiction over such Lender may enforce such pledge or security interest in any manner permitted under applicable law.

(g)    No assignment or participation may be made to the Borrower, Affiliate of the Borrower, Defaulting Lender or natural person. In connection with any assignment by a Defaulting Lender, such assignment shall be effective only upon payment by the Eligible Assignee or Defaulting Lender to the Agent of an aggregate amount sufficient, upon distribution (through direct payment, purchases of participations or other compensating actions as the Agent deems appropriate), (a) to satisfy all funding and payment liabilities then owing by the Defaulting Lender hereunder, and (b) to acquire its Pro Rata Share of all Loans. If an assignment by a Defaulting Lender shall become effective under applicable Requirement of Law for any reason without compliance with the foregoing sentence, then the assignee shall be deemed a Defaulting Lender for all purposes until such compliance occurs.

(h)    Each Lender that sells a participation shall, acting as a non-fiduciary agent of Borrower (solely for tax purposes), maintain a register in which it enters the Participant’s name, address and interest in Commitments, Loans (and stated interest). Entries in the register shall be conclusive, absent manifest error, and such Lender shall treat each Person recorded in the register as the owner of the participation for all purposes, notwithstanding any notice to the contrary. No Lender shall have an obligation to disclose any information in such register except to the extent necessary to establish that a Participant’s interest is in registered form under the Code.

ARTICLE XII

THE AGENT

SECTION 12.1Appointment and Authorization. Each Lender hereby designates and appoints Bank of America as its Agent under this Agreement and the other Loan Documents and each Lender hereby irrevocably authorizes the Agent to take such action on its behalf under the provisions of this Agreement and each other Loan Document and to exercise such powers and perform such duties as are expressly delegated to it by the terms of this Agreement or any other Loan Document, together with such powers as are reasonably incidental thereto. The Agent agrees to act as such on the express conditions contained in this Article 12. The provisions of this Article 12 are solely for the benefit of the Agent and the Lenders and the Borrower shall not have any rights as a third party beneficiary of any of the provisions contained herein. Notwithstanding any provision to the contrary contained elsewhere in this Agreement or in any other Loan Document, the Agent shall not have any duties or responsibilities, except those expressly set forth herein, nor shall the Agent have or be deemed to have any fiduciary relationship with any Lender, and no implied covenants, functions, responsibilities, duties, obligations or liabilities shall be read into this Agreement or any other Loan Document or otherwise exist against the Agent. Without limiting the generality of the foregoing sentence, the use of the term “agent”in this Agreement with reference to the Agent is not intended to connote any fiduciary or other implied (or express) obligations arising under agency doctrine of any applicable law. Instead, such term is used merely as a matter of market custom, and is intended to create or reflect only an administrative relationship between independent contracting parties. Except as expressly otherwise provided in this Agreement, the Agent shall have and may use its sole discretion with respect to exercising or refraining from exercising any discretionary rights or taking or refraining from taking any actions which the Agent is expressly entitled to take or assert under this Agreement and the other Loan Documents, including the exercise of remedies pursuant to Section 9.2, and any action so taken or not taken shall be deemed consented to by the Lenders.

SECTION 12.2Delegation of Duties. The Agent may execute any of its duties under this Agreement or any other Loan Document by or through agents, employees, or attorneys in fact and shall be entitled to advice of counsel concerning all matters pertaining to such duties. The Agent shall not be responsible for the negligence or misconduct of any agent or attorney in fact that it selects as long as such selection was made without gross negligence or willful misconduct.

SECTION 12.3Liability of Agent. None of the Agent Related Persons shall (a) be liable for any action taken or omitted to be taken by any of them under or in connection with this Agreement or any other Loan Document or the transactions contemplated hereby (except for its own gross negligence or willful misconduct), or (b)

22

be responsible in any manner to any of the Lenders for any recital, statement, representation, or warranty made by the Borrower, any Affiliate of the Borrower, or any officer thereof, contained in this Agreement or in any other Loan Document, or in any certificate, report, statement or other document referred to or provided for in, or received by the Agent under or in connection with, this Agreement or any other Loan Document, or the validity, effectiveness, genuineness, enforceability, or sufficiency of this Agreement or any other Loan Document, or for any failure of the Borrower or any other party to any Loan Document to perform its obligations hereunder or thereunder. No Agent Related Person shall be under any obligation to any Lender to ascertain or to inquire as to the observance or performance of any of the agreements contained in, or conditions of, this Agreement or any other Loan Document, or to inspect the properties, books, or records of the Borrower or any Affiliates of the Borrower.

SECTION 12.4Reliance by Agent. The Agent shall be entitled to rely, and shall be fully protected in relying, upon any writing, resolution, notice, consent, certificate, affidavit, letter, facsimile, telex or telephone message, statement or other document, or conversation believed by it to be genuine and correct and to have been signed, sent, or made by the proper Person or Persons, and upon advice and statements of legal counsel (including counsel to the Borrower), independent accountants and other experts selected by the Agent. The Agent shall be fully justified in failing or refusing to take any action under this Agreement or any other Loan Document unless it shall first receive such advice or concurrence of the Required Lenders as it deems appropriate and, if it so requests, it shall first be indemnified to its satisfaction by the Lenders against any and all liability and expense which may be incurred by it by reason of taking or continuing to take any such action. The Agent shall in all cases be fully protected in acting, or in refraining from acting, under this Agreement or any other Loan Document in accordance with a request or consent of the Required Lenders (or all Lenders if so required by Section 11.1) and such request and any action taken or failure to act pursuant thereto shall be binding upon all of the Lenders.

SECTION 12.5Notice of Default. The Agent shall not be deemed to have knowledge or notice of the occurrence of any Default or Event of Default, unless the Agent shall have received written notice from a Lender or the Borrower referring to this Agreement, describing such Default or Event of Default and stating that such notice is a “notice of default.”The Agent will notify the Lenders of its receipt of any such notice. The Agent shall take such action with respect to such Default or Event of Default as may be requested by the Required Lenders in accordance with Section 9; provided, however, that unless and until the Agent has received any such request, the Agent may (but shall not be obligated to) take such action, or refrain from taking such action, with respect to such Default or Event of Default as it shall deem advisable.

SECTION 12.6Credit Decision. Each Lender acknowledges that none of the Agent Related Persons has made any representation or warranty to it, and that no act by the Agent hereinafter taken, including any review of the affairs of the Borrower and its Affiliates, shall be deemed to constitute any representation or warranty by any Agent-Related Person to any Lender. Each Lender represents to the Agent that it has, independently (without reliance upon any Agent-Related Person and based on such documents and information as it has deemed appropriate), made its own appraisal of an investigation into the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrower and its Affiliates, and all applicable bank regulatory laws relating to the transactions contemplated hereby, and made its own decision to enter into this Agreement and to extend credit to the Borrower. Each Lender also represents that it will, independently (without reliance upon any Agent-Related Person and based on such documents and information as it shall deem appropriate at the time), continue to make its own credit analysis, appraisals, and decisions in taking or not taking action under this Agreement and the other Loan Documents, and to make such investigations as it deems necessary to inform itself as to the business, prospects, operations, property, financial and other condition, and creditworthiness of the Borrower. Except for notices, reports, and other documents expressly herein required to be furnished to the Lenders by the Agent, the Agent shall not have any duty or responsibility to provide any Lender with any credit or other information concerning the business, prospects, operations, property, financial and other condition, or creditworthiness of the Borrower which may come into the possession of any of the Agent Related Persons.

SECTION 12.7Indemnification. Whether or not the transactions contemplated hereby are consummated, the Lenders shall indemnify upon demand the Agent Related Persons (to the extent not reimbursed by or on behalf of the Borrower and without limiting the obligation of the Borrower to do so), in accordance with their Pro Rata Shares, from and against any and all Indemnified Liabilities as such term is defined in Section 13.11; provided, however, that no Lender shall be liable for the payment to the Agent Related Persons of any portion of such Indemnified Liabilities resulting solely from such Person’s gross negligence or willful misconduct. Without limitation of the foregoing, each Lender shall reimburse the Agent upon demand for its Pro Rata Share of any costs or out of pocket expenses (including Attorney Costs) incurred by the Agent in connection with the preparation, execution, delivery, administration, modification, amendment, or enforcement (whether through negotiations, legal proceedings, or

23

otherwise) of, or legal advice in respect of rights or responsibilities under, this Agreement, any other Loan Document, or any document contemplated by or referred to herein, to the extent that the Agent is not reimbursed for such expenses by or on behalf of the Borrower. The undertaking in this Section 12.7 shall survive the payment of all Obligations hereunder and the resignation or replacement of the Agent.

SECTION 12.8Agent in Individual Capacity. The Agent and its Affiliates may make loans to, issue letters of credit for the account of, accept deposits from, acquire Capital Stock in and generally engage in any kind of banking, trust, financial advisory, underwriting, or other business with the Borrower and its Affiliates as though the Agent were not the Agent hereunder and without notice to or consent of the Lenders. The Agent or its Affiliates may receive information regarding the Borrower and its Affiliates (including information that may be subject to confidentiality obligations in favor of the Borrower or its Affiliates) and acknowledge that the Agent shall be under no obligation to provide such information to them. With respect to its Loans, Bank of America shall have the same rights and powers under this Agreement as any other Lender and may exercise the same as though it were not the Agent, and the terms “Lender”and “Lenders”include Bank of America in its individual capacity.

SECTION 12.9Successor Agent. The Agent may resign as Agent upon at least thirty (30) days prior notice to the Lenders and the Borrower, such resignation to be effective upon the acceptance of a successor agent to its appointment as Agent. In the event Bank of America sells all of its Commitment and Loans as part of a sale, transfer or other disposition by Bank of America of substantially all of its loan portfolio, Bank of America shall resign as Agent and such purchaser or transferee shall become the successor Agent hereunder. Subject to the foregoing, if the Agent resigns under this Agreement, the Required Lenders shall appoint from among the Lenders a successor agent for the Lenders. If no successor agent is appointed prior to the effective date of the resignation of the Agent, the Agent may appoint, after consulting with the Lenders and the Borrower, a successor agent from among the Lenders or, if no Lender accepts such role, the Agent may appoint Required Lenders as successor Agent. Upon the acceptance of its appointment as successor agent hereunder, or upon appointment of Required Lenders as successor Agent, (a) such successor agent shall succeed to all the rights, powers, and duties of the retiring Agent, (b) the term “Agent”shall mean such successor agent, (c) the retiring Agent’s appointment, powers, and duties as Agent shall be terminated. After any retiring Agent’s resignation hereunder as Agent, the provisions of this Article 12 shall continue to inure to its benefit as to any actions taken or omitted to be taken by it while it was Agent under this Agreement. The Agent and successor agent shall execute all documents necessary to transfer any Agent’s Liens on any Collateral to the successor Agent.

SECTION 12.10Collateral Matters.

(a)    The Lenders hereby irrevocably authorize the Agent, at its option and in its sole discretion, to release any Agent’s Liens upon any Collateral upon the termination of the Commitments and Full Payment of the Obligations (other than contingent indemnity and expense reimbursement claims not then due). Except as provided above, the Agent will not release any of the Agent’s Liens without the prior written authorization of the Lenders. Upon request by the Agent or the Borrower at any time, the Lenders will confirm in writing the Agent’s authority to release any Agent’s Liens upon particular types or items of Collateral pursuant to this Section 12.10.

(b)    Upon receipt by the Agent of any authorization required pursuant to Section 12.10(a) from the Lenders of the Agent’s authority to release the Agent’s Liens upon particular types or items of Collateral, and upon at least five (5) Business Days’ prior written request by the Borrower, the Agent shall (and is hereby irrevocably authorized by the Lenders to) execute such documents as may be necessary to evidence the release of the Agent’s Liens upon such Collateral; provided, however, that (i) the Agent shall not be required to execute any such document on terms which, in the Agent’s opinion, would expose the Agent to liability or create any obligation or entail any consequence other than the release of such Liens without recourse or warranty, and (ii) such release shall not in any manner discharge, affect or impair the Obligations or any Liens (other than those expressly being released) upon (or obligations of any Loan Party in respect of) all interests retained by any Loan Party, including the proceeds of any sale, all of which shall continue to constitute part of the Collateral.

(c)    The Agent shall have no obligation whatsoever to any of the Lenders to assure that the Collateral exists or is owned by any Loan Party or is cared for, protected, or insured or has been encumbered, or that the Agent’s Liens have been properly or sufficiently or lawfully created, perfected, protected, or enforced or are entitled to any particular priority, or to exercise at all or in any particular manner or under any duty of care, disclosure, or fidelity, or to continue exercising, any of the rights, authorities, and powers granted or available to the Agent pursuant to any of the Loan Documents, it being understood and agreed that in respect of the Collateral, or any act, omission, or event related thereto, the Agent may act in any manner it may deem appropriate, in its sole discretion given the Agent’s own interest in the Collateral in its capacity as one of the Lenders and that the Agent shall have no other duty or liability whatsoever to any Lender as to any of the foregoing.

24

SECTION 12.11Restrictions on Actions by Lenders; Sharing of Payments.

(a)    Each of the Lenders agrees that it shall not, unless specifically requested to do so by the Agent, take or cause to be taken any action to enforce its rights under this Agreement or against any Loan Party, including the commencement of any legal or equitable proceedings, to foreclose any Lien on, or otherwise enforce any security interest in, any of the Collateral.

(b)    If at any time or times any Lender shall receive (i) by payment, foreclosure, setoff, or otherwise, any proceeds of Collateral or any payments with respect to the Obligations of any Loan Party to such Lender arising under, or relating to, this Agreement or the other Loan Documents, except for any such proceeds or payments received by such Lender from the Agent pursuant to the terms of this Agreement, or (ii) payments from the Agent in excess of such Lender’s ratable portion of all such distributions by the Agent, such Lender shall promptly (1) turn the same over to the Agent, in kind, and with such endorsements as may be required to negotiate the same to the Agent, or in same day funds, as applicable, for the account of all of the Lenders and for application to the Obligations in accordance with the applicable provisions of this Agreement, or (2) purchase, without recourse or warranty, an undivided interest and participation in the Obligations owed to the other Lenders so that such excess payment received shall be applied ratably as among the Lenders in accordance with their Pro Rata Shares; provided, however, that if all or part of such excess payment received by the purchasing party is thereafter recovered from it, those purchases of participations shall be rescinded in whole or in part, as applicable, and the applicable portion of the purchase price paid therefor shall be returned to such purchasing party, but without interest except to the extent that such purchasing party is required to pay interest in connection with the recovery of the excess payment. Notwithstanding the foregoing, if a Defaulting Lender obtains a payment or reduction of any Obligation, it shall immediately turn over the amount thereof to the Agent for application under Section 12.14(e) and it shall provide a written statement to the Agent describing the Obligation affected by such payment or reduction.

SECTION 12.12Agency for Perfection. Each Lender hereby appoints each other Lender as agent for the purpose of perfecting the Lenders’ security interest in assets which, in accordance with Article 9 of the UCC can be perfected only by possession or control. Should any Lender (other than the Agent) obtain possession or control of any such Collateral, such Lender shall notify the Agent thereof, and, promptly upon the Agent’s request therefor shall deliver such Collateral or control thereof to the Agent or in accordance with the Agent’s instructions.

SECTION 12.13Payments by Agent to Lenders. All payments to be made by the Agent to the Lenders shall be made by bank wire transfer or internal transfer of immediately available funds to each Lender pursuant to wire transfer instructions delivered in writing to the Agent on or prior to the Closing Date (or if such Lender is an Assignee, on the applicable Assignment and Acceptance), or pursuant to such other wire transfer instructions as each party may designate for itself by written notice to the Agent. Concurrently with each such payment, the Agent shall identify whether such payment (or any portion thereof) represents principal, premium, or interest on the Loans or otherwise. Unless the Agent receives notice from the Borrower prior to the date on which any payment is due to the Lenders that the Borrower will not make such payment in full as and when required, the Agent may assume that the Borrower has made such payment in full to the Agent on such date in immediately available funds and the Agent may (but shall not be so required), in reliance upon such assumption, distribute to each Lender on such due date an amount equal to the amount then due such Lender. If and to the extent the Borrower has not made such payment in full to the Agent, each Lender shall repay to the Agent on demand such amount distributed to such Lender, together with interest thereon at the Federal Funds Rate for each day from the date such amount is distributed to such Lender until the date repaid.

SECTION 12.14Settlement

(a)    Lenders' Failure to Perform. All Loans shall be made by the Lenders simultaneously and in accordance with their Pro Rata Shares. It is understood that (i) no Lender shall be responsible for any failure by any other Lender to perform its obligation to make any Loans hereunder, nor shall any Commitment of any Lender be increased or decreased as a result of any failure by any other Lender to perform its obligation to make any Loans hereunder, (ii) no failure by any Lender to perform its obligation to make any Loans hereunder shall excuse any other Lender from its obligation to make any Loans hereunder, and (iii) the obligations of each Lender hereunder shall be several, not joint and several.

(b)Defaulting Lenders. Unless the Agent receives notice from a Lender at least one (1) Business Day prior to the date of a Borrowing, that such Lender will not make available as and when required hereunder to the Agent that Lender’s Pro Rata Share of such Borrowing, the Agent may assume that each Lender has made such amount available to the Agent in immediately available funds on the Funding Date. Furthermore, the Agent may, in reliance

25

upon such assumption, make available to the Borrower on such date a corresponding amount. If any Lender has not transferred its full Pro Rata Share to the Agent in immediately available funds and the Agent has transferred corresponding amount to the Borrower on the Business Day following such Funding Date, that Lender shall make such amount available to the Agent, together with interest at the Federal Funds Rate for that day. A notice by the Agent submitted to any Lender with respect to amounts owing shall be conclusive, absent manifest error. If each Lender’s full Pro Rata Share is transferred to the Agent as required, the amount transferred to the Agent shall constitute that Lender’s Loan for all purposes of this Agreement. If that amount is not transferred to the Agent on the Business Day following the Funding Date, the Agent will notify the Borrower of such failure to fund and, upon demand by the Agent, the Borrower shall pay such amount to the Agent for the Agent’s account, together with interest thereon for each day elapsed since the date of such Borrowing, at a rate per annum equal to the Interest Rate applicable at the time to the Loans comprising that particular Borrowing. The failure of any Lender to make any Loan on any Funding Date shall not relieve any other Lender of its obligation hereunder to make a Loan on that Funding Date. No Lender shall be responsible for any other Lender’s failure to advance such other Lenders’ Pro Rata Share of any Borrowing.

(c)Reallocation of Pro Rata Share; Amendments. For purposes of determining Lenders’ obligations to fund or participate in the Loans, the Agent may exclude the Commitments and Loans of any Defaulting Lender(s) from the calculation of Pro Rata Shares. A Defaulting Lender shall have no right to vote on any amendment, waiver or other modification of a Loan Document, except as provided in Section 11.1.

(d)Payments. The Agent may, in its discretion, receive and retain any amounts payable to a Defaulting Lender under the Loan Documents, and a Defaulting Lendershall be deemed to have assigned to the Agent such amounts until all Obligations owing to the Agent and non-Defaulting Lenders have been paid in full. The Agent may apply such amounts to the Defaulting Lender’s defaulted obligations or readvance the amounts to the Borrower hereunder.

(e)Cure. The Borrower and the Agent may agree in writing that a Lender is no longer a Defaulting Lender. At such time, Pro Rata Shares shall be reallocated without exclusion of such Lender’s Commitments and Loans, and all outstanding Loans and other exposures hereunder shall be reallocated among the Lenders and settled by the Agent (with appropriate payments by the reinstated Lender) in accordance with the readjusted Pro Rata Shares. Unless expressly agreed by the Borrower and the Agent, no reinstatement of a Defaulting Lender shall constitute a waiver or release of claims against such Lender. The failure of any Lender to fund a Loan or otherwise to perform its obligations hereunder shall not relieve any other Lender of its obligations, and no Lender shall be responsible for default by another Lender.

SECTION 12.15Concerning the Collateral and the Related Loan Documents. Each Lender authorizes and directs the Agent to enter into the other Loan Documents, for the ratable benefit and obligation of the Agent and the Lenders, and to amend the Schedules to the Loan Documents without a separate amendment to this Agreement or the other Loan Documents signed by the requisite Lenders if the underlying transactions necessitating such amendments of the Schedules are permitted under this Agreement or the other Loan Documents. Each Lender agrees that any action taken by the Agent or Required Lenders, as applicable, in accordance with the terms of this Agreement or the other Loan Documents, and the exercise by the Agent or the Required Lenders, as applicable, of their respective powers set forth therein or herein, together with such other powers that are reasonably incidental thereto, shall be binding upon all of the Lenders. The Lenders acknowledge that the Loans and all interest, fees and expenses hereunder constitute one Debt, secured pari passu by all of the Collateral.

SECTION 12.16Relation Among Lenders. The Lenders are not partners or co-venturers, and no Lender shall be liable for the acts or omissions of, or (except as otherwise set forth herein in case of the Agent) authorized to act for, any other Lender.

ARTICLE XIII

MISCELLANEOUS

SECTION 13.1No Waivers; Cumulative Remedies. No failure by the Agent or any Lender to exercise any right, remedy, or option under this Agreement or any present or future supplement thereto, or in any other agreement between or among the Borrower and the Agent and/or any Lender, or delay by the Agent or any Lender in exercising the same, will operate as a waiver thereof. No waiver by the Agent or any Lender will be effective unless it is in writing, and then only to the extent specifically stated. No waiver by the Agent or the Lenders on any occasion shall affect or diminish the Agent’s and each Lender’s rights thereafter to require strict performance by the Borrower of any provision of this Agreement. The Agent and the Lenders may proceed directly to collect the Obligations without

26

any prior recourse to the Collateral. The Agent’s and each Lender’s rights under this Agreement will be cumulative and not exclusive of any other right or remedy which the Agent or any Lender may have.

SECTION 13.2Severability. The illegality or unenforceability of any provision of this Agreement or any Loan Document or any instrument or agreement required hereunder shall not in any way affect or impair the legality or enforceability of the remaining provisions of this Agreement or any instrument or agreement required hereunder.

SECTION 13.3Governing Law; Choice of Forum; Service of Process.

(a)    This Agreement and the US Security Agreement have been entered into pursuant to Section 5-1401 of the New York General Obligations Law and the substantive laws of the State of New York (except to the extent the laws of another jurisdiction govern the creation, perfection, validity, or enforcement of Liens under the Collateral Documents), and the applicable federal laws of the United States of America shall govern the validity, construction, enforcement and interpretation of this Agreement and the US Security Agreement.

(b)    Each party hereto, in each case for itself, its successors and assigns, hereby (A) irrevocably and unconditionally agrees that it will not commence any action, litigation or proceeding of any kind or description, whether in law or equity, whether in contract or in tort or otherwise, against any party or any Related Party of the foregoing in any way relating to this Agreement or any other Loan Document or the transactions relating hereto or thereto, in any forum other than the courts of the State of New York sitting in New York County, and of the United States District Court of the Southern District of New York, and any appellate court from any thereof, and each of the parties hereto irrevocably and unconditionally submits to the jurisdiction of such  courts and agrees that all claims in respect of any such action, litigation or proceeding may be heard and determined in such New York State court or, to the fullest extent permitted by applicable law, in such federal court, and each of the parties hereto agrees that a final judgment in any such action, litigation or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law, and agrees and consents that service of process may be made upon it in any legal proceeding arising out of or in connection with the Loan Documents and the Obligations by service of process as provided by New York law, (B) irrevocably waives, to the fullest extent permitted by law, any objection which it may now or hereafter have to the laying of venue of any litigation arising out of or in connection with the Loan Documents and the Obligations brought in any such court, (C) irrevocably waives to the fullest extent permitted by law any claims that any litigation brought in any such court has been brought in an inconvenient forum, (D) agrees to designate and maintain an agent for service of process in New York in connection with any such litigation and to deliver to the Agent evidence thereof, if requested, and (E) irrevocably agrees to the fullest extent permitted by law that any legal proceeding against any party hereto arising out of or in connection with the Loan Documents or the Obligations shall be brought in one of the aforementioned courts. The scope of each of the foregoing waivers is intended to be all-encompassing of any and all disputes that may be filed in any court and that relate to the subject matter of this transaction, including, without limitation, contract claims, tort claims, breach of duty claims, and all other common law and statutory claims. The Loan Parties and each other party to the Loan Documents acknowledge that this waiver is a material inducement to the agreement of each party hereto to enter into a business relationship, that each has already relied on this waiver in entering into the Loan Documents, and each will continue to rely on each of such waivers in related future dealings. The Loan Parties and each other party to the Loan Documents warrant and represent that they have reviewed these waivers with their legal counsel, and that they knowingly and voluntarily agree to each such waiver following consultation with legal counsel. THE WAIVERS IN THIS SECTION 13.3 ARE IRREVOCABLE, MEANING THAT THEY MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THESE WAIVERS SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, SUPPLEMENTS, AND REPLACEMENTS TO OR OF THIS OR ANY OTHER LOAN DOCUMENT. In the event of litigation, this Agreement may be filed as a written consent to a trial by the court. Notwithstanding the foregoing: (1) the Agent and the Lenders shall have the right to bring any action or proceeding against any Loan Party or their property in the courts of any other jurisdiction the Agent or the Lenders deem necessary or appropriate in order to realize on the Collateral or other security for the Obligations and (2) each of the parties hereto acknowledges that any appeals from the courts described in the immediately preceding sentence may have to be heard by a court located outside those jurisdictions. Notwithstanding the foregoing, nothing contained in this Agreement or in any other Loan Document shall affect any right that the Agent or any Lender may otherwise have to bring any action or proceeding relating to the Collateral Documents against the Borrower or any other Loan Party or its properties in the courts of any jurisdiction.

(c)    THE BORROWER AND EACH OTHER LOAN PARTY HEREBY WAIVES PERSONAL SERVICE OF ANY AND ALL PROCESS UPON IT AND CONSENTS THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY REGISTERED MAIL (RETURN RECEIPT REQUESTED) DIRECTED TO THE BORROWER

27

AT ITS ADDRESS SET FORTH IN SECTION 13.8 AND SERVICE SO MADE SHALL BE DEEMED TO BE COMPLETED UPON THE EARLIER OF (I) TWO (2) DAYS AFTER THE SAME SHALL HAVE BEEN SO DEPOSITED WITH A NATIONALLY-RECOGNIZED OVERNIGHT COURIER OR (II) WHEN ACTUALLY DELIVERED TO SUCH PERSON. NOTHING CONTAINED HEREIN SHALL AFFECT THE RIGHT OF THE AGENT OR THE LENDERS TO SERVE LEGAL PROCESS BY ANY OTHER MANNER PERMITTED BY LAW.

SECTION 13.4WAIVER OF JURY TRIAL. THE BORROWER AND EACH OTHER LOAN PARTY, THE LENDERS, AND THE AGENT EACH IRREVOCABLY WAIVE THEIR RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF OR RELATED TO THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY, IN ANY ACTION, PROCEEDING, OR OTHER LITIGATION OF ANY TYPE BROUGHT BY ANY SUCH PARTIES AGAINST ANY OTHER SUCH PARTY OR ANY AGENT-RELATED PERSON, PARTICIPANT, OR ASSIGNEE, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS, OR OTHERWISE. THE BORROWER, THE LENDERS, AND THE AGENT EACH AGREE THAT ANY SUCH CLAIM OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY. WITHOUT LIMITING THE FOREGOING, THE PARTIES FURTHER AGREE THAT THEIR RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THIS AGREEMENT, THE OTHER LOAN DOCUMENTS, OR ANY PROVISION HEREOF OR THEREOF. THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS, OR MODIFICATIONS TO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS.

SECTION 13.5Survival of Representations and Warranties. All of the Borrower’s representations and warranties contained in this Agreement shall survive the execution, delivery, and acceptance thereof by the parties, notwithstanding any investigation by the Agent or the Lenders or their respective agents.

SECTION 13.6Limited Recourse. The Agent and the Lenders hereby acknowledge and agree that the Obligations of the Loan Parties under the Loan Documents shall be satisfied from only the Collateral and the other assets of the Loan Parties. The Agent and the Lenders shall have no recourse to the assets of any partner of the Borrower for any of the Obligations (other than the assets held by such partners in their capacity as partners of the Borrower).

SECTION 13.7Fees and Expenses. The Borrower agrees to pay to the Agent, for its benefit, on demand, all reasonable costs and expenses that the Agent pays or incurs in connection with the negotiation, preparation, syndication, consummation, administration, enforcement, and termination of this Agreement or any of the other Loan Documents, including: (a) Attorney Costs and costs and expenses of auditors, accountants, consultants or appraisers hired by the Agent; (b) costs and expenses (including, without duplication, attorneys’ and paralegals’ fees and disbursements) for any amendment, supplement, waiver, consent, or subsequent closing in connection with the Loan Documents and the transactions contemplated thereby; (c) costs and expenses of lien searches; (d) taxes, fees, and other charges for filing financing statements, amendments, and continuations, and other actions to perfect, protect, and continue the Agent’s Liens (including costs and expenses paid or incurred by the Agent in connection with the consummation of the Agreement); (e) sums paid or incurred to pay any amount or take any action reasonably required of the Borrower under the Loan Documents that Borrower fails to pay or take; and (f) costs of appraisals, inspections, and verifications of the Collateral, including travel, lodging, and meals for inspections of the Loan Parties’ operations by the Agent. In addition, the Borrower agrees to pay costs and expenses incurred by the Agent and the Lenders (including Attorneys’ Costs and attorneys’ fees of each Lender) to the Agent and the Lenders, as applicable, for their respective benefit, on demand, and all reasonable fees, expenses and disbursements incurred by the Agent and the Lenders for any law firm retained by the Agent or any Lender, in each case, paid or incurred to obtain payment of the Obligations, enforce the Agent’s Liens, sell or otherwise realize upon the Collateral, and otherwise enforce the provisions of the Loan Documents, or to defend any claims made or threatened against the Agent or any Lender arising out of the transactions contemplated hereby (including preparations for and consultations concerning any such matters). The foregoing shall not be construed to limit any other provisions of the Loan Documents regarding costs and expenses to be paid by the Borrower. Except as provided in clause (d) above, this Section 13.7 shall not apply to Taxes, which shall be covered solely by Sections 4.1 and 4.3.

SECTION 13.8Notices. Except as otherwise provided herein, all notices, demands and requests that any party is required or elects to give to any other shall be in writing, or by a telecommunications device capable of creating a written record, and any such notice shall become effective (a) on the earlier of (i) two (2) days after the same shall have been so deposited with a nationally-recognized overnight courier or (ii) when actually delivered to such person, (b) four (4) days after it shall have been mailed by United States mail, first class, certified or registered,

28

with postage prepaid, or (c) in the case of notice by such a telecommunications device, when properly transmitted, in each case addressed to the party to be notified as follows:

If to the Agent:

Bank of America, N.A.
One Bryant Park, 18^th Floor
New York, NY 10036
Attention: Lindsay Kim

Email: lindsay.kim@baml.com

Telephone: +1 (646) 855-2760

Facsimile No.: +1 (212) 548-8525

If to the Borrower:

Westlake International Holdings II C.V.
c/o Westlake Chemical Corporation
2801 Post Oak Boulevard
Houston, TX 77056
Attention: Treasurer
Facsimile No.: 713.960.9420

with copies to:

Westlake Chemical Corporation
2801 Post Oak Boulevard
Houston, TX 77056
Attention: General Counsel
Facsimile No.: 713.926.6239

or to such other address as each party may designate for itself by like notice. Failure or delay in delivering copies of any notice, demand, request, consent, approval, declaration or other communication to the persons designated above to receive copies shall not adversely affect the effectiveness of such notice, demand, request, consent, approval, declaration or other communication. All notices and requests given to any Lender shall be given to the address, telecopier number, electronic mail address or telephone number specified in its administrative questionnaire, or such other address as such Lender may notify the Agent in writing.

Borrower Materials shall be delivered pursuant to procedures approved by the Agent, including electronic delivery (if possible) upon request by the Agent to an electronic system maintained by the Agent (“Platform”). The Borrower shall notify the Agent of each posting of Borrower Materials on the Platform and the materials shall be deemed received by the Agent only upon its receipt of such notice. Borrower Materials and other information relating to this credit facility may be made available to the Lenders on the Platform, and the Loan Parties and Lenders acknowledge that “public” information is not segregated from material non-public information on the Platform. The Platform is provided “as is” and “as available.” The Agent does not warrant the accuracy or completeness of any information on the Platform nor the adequacy or functioning of the Platform, and expressly disclaims liability for any errors or omissions in the Borrower Materials or any issues involving the Platform. NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT OF THIRD PARTY RIGHTS, OR FREEDOM FROM VIRUSES OR OTHER CODE DEFECTS, IS MADE BY AGENT WITH RESPECT TO BORROWER MATERIALS OR THE PLATFORM. The Lenders acknowledge that Borrower Materials may include material non-public information of the Loan Parties and should not be made available to any personnel who do not wish to receive such information or who may be engaged in investment or other market-related activities with respect to any Loan Party’s securities. No Agent-Related Person shall have any liability to Borrower, the Lenders or any other Person for losses, claims, damages, liabilities or expenses of any kind (whether in tort, contract or otherwise) relating to use by any Person of the Platform or delivery of Borrower Materials and other information through the Platform or over the internet.

29

SECTION 13.9Waiver of Notices. Unless otherwise expressly provided herein, the Borrower waives presentment, and notice of demand or dishonor and protest as to any instrument, notice of intent to accelerate the Obligations, and notice of acceleration of the Obligations, as well as any and all other notices to which it might otherwise be entitled. No notice to or demand on the Borrower which the Agent or any Lender may elect to give shall entitle the Borrower to any or further notice or demand in the same, similar, or other circumstances.

SECTION 13.10Binding Effect. The provisions of this Agreement shall be binding upon and inure to the benefit of the respective representatives, successors, and assigns of the parties hereto; provided, however, that no interest herein may be assigned by the Borrower without prior written consent of the Agent and each Lender. The rights and benefits of the Agent and the Lenders hereunder shall, if such Persons so agree, inure to any party acquiring any interest in the Obligations or any part thereof.

SECTION 13.11Indemnity of the Agent and the Lenders by the Borrower.

(a)    The Borrower and each other Loan Party agrees to defend, indemnify, and hold the Agent-Related Persons, each Lender and each of their respective Affiliates, officers, directors, employees, counsel, representatives, agents, trustees, and attorneys in fact (each, an “Indemnified Person”) harmless from and against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, charges, expenses, and disbursements (including Attorney Costs) of any kind or nature whatsoever which may at any time (including at any time following repayment of the Loans and the termination, resignation, or replacement of the Agent or replacement of any Lender) be imposed on, incurred by, or asserted against any such Person in any way relating to or arising out of this Agreement or any document contemplated by or referred to herein, or the transactions contemplated hereby, or any action taken or omitted by any such Person under or in connection with any of the foregoing, including with respect to any investigation, litigation, or proceeding (including any insolvency proceeding or appellate proceeding) related to or arising out of this Agreement, any other Loan Document, or the Loans or the use of the proceeds thereof, whether brought by a third party or by the Borrower or any other Loan Party, and regardless of whether any Indemnified Person is a party thereto and including any costs (including any taxes) borne by the Agent or any Lender if the Facility is recast as equity for U.S. federal income tax purposes and settlement costs (all the foregoing, collectively, the “Indemnified Liabilities”), IN ALL CASES, WHETHER OR NOT CAUSED BY OR ARISING, IN WHOLE OR IN PART, OUT OF THE COMPARATIVE, CONTRIBUTORY OR SOLE NEGLIGENCE OF THE INDEMNIFIED PERSON; provided, that neither the Borrower nor any Loan Party shall have any obligation hereunder to any Indemnified Person with respect to any Indemnified Liabilities to the extent resulting from, arising out of or in connection with, (i) the material breach, gross negligence or willful misconduct of such Indemnified Person determined in a final non-appealable judgment by a court of competent jurisdiction or (ii) any proceeding that does not involve an act or omission by the Borrower or any of its Subsidiaries that is brought by an Indemnified Person against any other Indemnified Person (other than claims against an Indemnified Person in its capacity or in fulfilling its role as an administrative agent or arranger or any similar role under this Agreement). The agreements in this Section shall survive payment of all other Obligations. This Section 13.11(a) shall not apply to Taxes, which shall be covered solely by Sections 4.1, 4.3 and 13.7(d).

(b)    The Borrower and each other Loan Party agrees to indemnify, defend, and hold harmless the Agent and the Lenders from any Environmental Liability, arising directly or indirectly, in whole or in part, out of any breach of this Agreement, including without limitation, any breach of Section 6.9 by any Loan Party. This indemnity will apply whether the Hazardous Material is on, under, or about any Real Estate or operations or property leased to, or formerly owned or operated by, any Loan Party or any of their Subsidiaries. The indemnity includes, but is not limited to, Attorneys Costs. The indemnity extends to the Agent and the Lenders, their parents, affiliates, subsidiaries, and all of their directors, officers, employees, agents, successors, attorneys, and assigns. This indemnity will survive repayment of all other Obligations. This indemnity is intended to allocate responsibility between the Loan Parties and the Agent and the Lenders as contemplated by Section 107(e)(1) of CERCLA and any successor federal statute, rule, or regulations or comparable state statute, rule, or regulations.

SECTION 13.12Limitation of Liability. NO CLAIM MAY BE MADE BY ANY LOAN PARTY, ANY LENDER, OR OTHER PERSON AGAINST ANY LOAN PARTY, THE AGENT, ANY LENDER, OR THE AFFILIATES, DIRECTORS, OFFICERS, EMPLOYEES, COUNSEL, REPRESENTATIVES, AGENTS, OR ATTORNEYS-IN-FACT OF ANY OF THEM FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE DAMAGES IN RESPECT OF ANY CLAIM FOR BREACH OF CONTRACT OR ANY OTHER THEORY OF LIABILITY ARISING OUT OF OR RELATED TO THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY ACT, OMISSION, OR EVENT OCCURRING IN CONNECTION THEREWITH, AND THE BORROWER AND EACH OTHER LOAN PARTY AND EACH LENDER HEREBY WAIVES, RELEASES, AND AGREES NOT TO SUE UPON ANY CLAIM FOR SUCH DAMAGES,

30

WHETHER OR NOT ACCRUED AND WHETHER OR NOT KNOWN OR SUSPECTED TO EXIST IN ITS FAVOR. Notwithstanding the foregoing, nothing in this Section 13.12 shall impair, limit or restrict any indemnification obligations of any Loan Party or any Lender under any Loan Document. No Indemnified Person referred to in Section 13.11(a) above shall be liable for any damages arising from the use by unintended recipients of any information or other materials distributed by it through telecommunications, electronic or other information transmission systems in connection with this Agreement or the other Loan Documents or the transactions contemplated hereby or thereby.

SECTION 13.13No Advisory or Fiduciary Responsibility. In connection with all aspects of each transaction contemplated by any Loan Document, the Borrower acknowledges and agrees that (a)(i) this credit facility and any related arranging or other services by the Agent, any Lender, any of their Affiliates or any arranger are arm’s-length commercial transactions between the Borrower and such Person; (ii) the Borrower has consulted its own legal, accounting, regulatory and tax advisors to the extent they have deemed appropriate; and (iii) the Borrower is capable of evaluating, and understand and accept, the terms, risks and conditions of the transactions contemplated by the Loan Documents; (b) each of the Agent, the Lenders, their Affiliates and any arranger is and has been acting solely as a principal and, except as expressly agreed in writing by the relevant parties, has not been, is not, and will not be acting as an advisor, agent or fiduciary for the Borrower, any of its Affiliates or any other Person, and has no obligation with respect to the transactions contemplated by the Loan Documents except as expressly set forth therein; and (c) the Agent, the Lenders, their Affiliates and any arranger may be engaged in a broad range of transactions that involve interests that differ from those of the Borrower and its Affiliates, and have no obligation to disclose any of such interests to the Borrower or its Affiliates. To the fullest extent permitted by applicable Law, the Borrower hereby waives and releases any claims that it may have against the Agent, the Lenders, their Affiliates and any arranger with respect to any breach of agency or fiduciary duty in connection with any transaction contemplated by a Loan Document.

SECTION 13.14Final Agreement. THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. No modification, rescission, waiver, release, or amendment of any provision of this Agreement or any other Loan Document shall be made, except by a written agreement signed by the Borrower and a duly authorized officer of each of the Agent and the requisite Lenders.

SECTION 13.15Counterparts. This Agreement may be executed in any number of counterparts, and by the Agent, each Lender and the Borrower in separate counterparts, each of which shall be an original, but all of which shall together constitute one and the same agreement; signature pages may be detached from multiple separate counterparts and attached to a single counterpart so that all signature pages are physically attached to the same document.

SECTION 13.16Captions. The captions contained in this Agreement are for convenience of reference only, are without substantive meaning and should not be construed to modify, enlarge, or restrict any provision.

SECTION 13.17Right of Setoff. In addition to any rights and remedies of the Lenders provided by law, if an Event of Default has occurred and is continuing or the Loans have been accelerated, the Agent, each Lender and any of their respective Affiliates are authorized at any time and from time to time, without prior notice to any Loan Party, any such notice being waived by each Loan Party to the fullest extent permitted by law, to set off and apply any and all deposits (general or special, time or demand, provisional or final) at any time held by, and other indebtedness at any time owing by, the Agent, such Lender or such Affiliate to or for the credit or the account of any Loan Party against any and all Obligations (for the benefit of all Lenders as provided herein), now or hereafter existing, irrespective of whether or not the Agent or such Lender shall have made demand under this Agreement or any Loan Document and although such Obligations may be contingent or unmatured. Each Lender agrees to promptly notify the Borrower and the Agent after any such setoff and application made by such Lender; provided, however, that the failure to give such notice shall not affect the validity of such set off and application. If any Lender shall obtain any payment or prepayment with respect to the Obligation as a result of exercising its right under this Section 13.16 which is in excess of its share of any such payment in accordance with the relevant rights of the Lenders under the Loan Documents, then such Lender shall purchase from the other Lenders such participations as shall be necessary to cause such purchasing Lender to share the excess payment with each other Lender in accordance with the relevant rights under the Loan Documents. If all or any portion of such excess payment is subsequently recovered from such purchasing Lender, then the purchase shall be rescinded and the purchase price restored to the extent of such recovery. Each Loan Party agrees that any Lender purchasing a participation from another Lender pursuant to this Section may, to the fullest extent permitted by law, exercise all of its rights of payment (including the right of offset) with respect to such participation as fully as if such Lender were the direct creditor of such Loan Party in the amount of such participation.

31

SECTION 13.18Confidentiality.

(a)    The Borrower hereby consents that the Agent and each Lender may issue and disseminate to the public general non-confidential information describing the credit accommodation entered into pursuant to this Agreement, including the names and addresses of the Borrower and a general description of the business of the Borrower and may use the Borrower’s name in advertising and other promotional material.

(b)    The Agent and each Lender severally agrees to take customary and reasonable precautions and exercise due care to maintain the confidentiality of all information identified as “confidential”or “secret”by the Borrower and provided to the Agent or such Lender by or on behalf of the Borrower, under this Agreement, or any other Loan Document, except to the extent that such information (i) was or becomes generally available to the public other than as a result of disclosure by the Agent or such Lender, (ii) was or becomes available on a nonconfidential basis from a source other than the Borrower, provided that such source is not bound by a confidentiality agreement with the Borrower known to the Agent or such Lender, (iii) was in possession of a Lender prior to disclosure made by the Borrower, or (iv) is independently developed by any Lender without the use or knowledge of any Confidential Information; provided, however, that the Agent and any Lender may disclose such information (1) at the request or pursuant to any requirement of any Governmental Authority to which the Agent or such Lender is subject or in connection with an examination of the Agent or such Lender by any such Governmental Authority; (2) pursuant to subpoena or other court process; (3) when required to do so in accordance with the provisions of any applicable Requirement of Law; (4) to the extent reasonably required in connection with any litigation or proceeding (including, but not limited to, any bankruptcy proceeding) to which the Agent, any Lender or their respective Affiliates may be party; (5) to the extent reasonably required in connection with the exercise of any remedy hereunder or under any other Loan Document; (6) to the Agent’s or such Lender’s independent auditors, accountants, agents, attorneys, service providers, other professional advisors, rating agencies, insurers, insurance brokers, and providers of credit risk protection, provided that such Persons have been informed that such information is required to be kept confidential to the extent required by this Section 13.18; (7) to any prospective Participant or Assignee under any Assignment and Acceptance, actual or potential, provided that such prospective Participant or Assignee agrees to keep such information confidential to the same extent required of the Agent and the Lenders hereunder; (8) as expressly permitted under the terms of any other document or agreement regarding confidentiality to which the Borrower is party with the Agent or such Lender, and (9) to its Affiliates; provided that such Persons have been informed that such information is required to be kept confidential to the extent required by this Section 13.18. Notwithstanding anything herein to the contrary, the information subject to this Section 13.18(b) shall not include, and the Agent, each Lender, and each employee, representative, or other agent of the Agent or any Lender may disclose to any and all persons without limitation of any kind, the “tax treatment”and “tax structure”(in each case, within the meaning of Treasury Regulation Section 1.6011-4) of the transactions contemplated hereby and all materials of any kind (including opinions or other tax analyses) that are provided to the Agent or such Lender relating to such tax treatment and tax structure.

SECTION 13.19Conflicts with Other Loan Documents. Unless otherwise expressly provided in this Agreement (or in another Loan Document by specific reference to the applicable provision contained in this Agreement), if any provision contained in this Agreement conflicts with any provision of any other Loan Document, the provision contained in this Agreement shall govern and control.

SECTION 13.20Patriot Act Notice. The Agent and Lenders hereby notify the Loan Parties that pursuant to the requirements of the Patriot Act, the Agent and Lenders are required to obtain, verify and record information that identifies each Loan Party, including its legal name, address, tax ID number and other information that will allow the Agent and the Lenders to identify it in accordance with the Patriot Act. The Agent and the Lenders will also require information regarding each personal guarantor, if any, and may require information regarding the Borrower’s management and owners, such as legal name, address, social security number and date of birth.

SECTION 13.21Electronic Execution. The words “execution,”“signed,”“signature,”and words of like import in this Agreement, any Assignment and Assumption, or in any amendment or other modification hereof (including waivers and consents) shall be deemed to include electronic signatures or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

SECTION 13.22Judgment Currency. If, for the purposes of obtaining judgment in any court, it is necessary to convert a sum due hereunder or any other Loan Document in one currency into another currency, the

32

rate of exchange used shall be that at which in accordance with normal banking procedures the Agent could purchase the first currency with such other currency on the Business Day preceding that on which final judgment is given. The obligation of the Borrower in respect of any such sum due from it to the Agent or any Lender hereunder or under the other Loan Documents shall, notwithstanding any judgment in a currency (the “Judgment Currency”) other than that in which such sum is denominated in accordance with the applicable provisions of this Agreement (the “Agreement Currency”), be discharged only to the extent that on the Business Day following receipt by the Agent or such Lender, as the case may be, of any sum adjudged to be so due in the Judgment Currency, the Agent or such Lender, as the case may be, may in accordance with normal banking procedures purchase the Agreement Currency with the Judgment Currency. If the amount of the Agreement Currency so purchased is less than the sum originally due to the Agent or any Lender from the Borrower in the Agreement Currency, the Borrower agrees, as a separate obligation and notwithstanding any such judgment, to indemnify the Agent or such Lender, as the case may be, against such loss. If the amount of the Agreement Currency so purchased is greater than the sum originally due to the Agent or any Lender in such currency, the Agent or such Lender, as the case may be, agrees to return the amount of any excess to the Borrower (or to any other Person who may be entitled thereto under applicable law).

SECTION 13.23Acknowledgement and Consent to Bail-In of EEA Financial Institutions. Solely to the extent any Lender that is an EEA Financial Institution is a party to this Agreement and notwithstanding anything to the contrary in any Loan Document or in any other agreement, arrangement or understanding among any such parties, each party hereto acknowledges that any liability of any Lender that is an EEA Financial Institution arising under any Loan Document, to the extent such liability is unsecured, may be subject to the Write-Down and Conversion Powers of an EEA Resolution Authority and agrees and consents to, and acknowledges and agrees to be bound by:

(a)    the application of any Write-Down and Conversion Powers by an EEA Resolution Authority to any such liabilities arising hereunder which may be payable to it by any Lender that is an EEA Financial Institution; and

(b)    the effects of any Bail-In Action on any such liability, including, if applicable:

(i)    a reduction in full or in part or cancellation of any such liability;

(ii)    a conversion of all, or a portion of, such liability into shares or other instruments of ownership in such EEA Financial Institution, its parent undertaking, or a bridge institution that may be issued to it or otherwise conferred on it, and that such shares or other instruments of ownership will be accepted by it in lieu of any rights with respect to any such liability under this Agreement or any other Loan Document; or

(iii)    the variation of the terms of such liability in connection with the exercise of the write-down and conversion powers of any EEA Resolution Authority.

[Remainder of Page Intentionally Blank. Signature Page Follows.]

33

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their respective authorized officers as of the day and year first above written.

BORROWER:

WESTLAKE INTERNATIONAL HOLDINGS II C.V., ACTING THROUGH WESTLAKE OLEFINS CORPORATION, ITS GENERAL PARTNER

By: /s/ Albert Chao

Name: Albert Chao

Title: President and Secretary

Signature Page to Credit Agreement

BANKOFAMERICA, N.A.,
as the Agent

By: /s/ Lindsay Kim    
Name: Lindsay Kim
Title: Vice President    

BANKOFAMERICA, N.A.,
as a Lender

By: /s/ Lindsay Kim    
Name: Lindsay Kim    
Title: Vice President    

Signature Page to Credit Agreement

ANNEX A
to
Credit Agreement

Definitions

Capitalized terms used in the Loan Documents shall have the following respective meanings (unless otherwise defined therein), and all section references in the following definitions shall refer to sections of the Agreement:

“Acquisition”means any transaction or series of related transactions for the purpose of, or resulting in, directly or indirectly, (a) the acquisition by any Person of all or substantially all of the assets of a Person or of any business or division of a Person; (b) the acquisition by any Person of more than 50% of any class of Voting Stock (or similar ownership interests) of any Person; or (c) a merger, consolidation, amalgamation, or other combination by any Person with another Person if the Borrower or a Subsidiary is the surviving entity, provided that, (i) in any merger involving any Loan Party, a Loan Party must be the surviving entity; and (ii) for purpose of this Agreement, any Acquisition among Loan Parties is not an “Acquisition.”

“Affiliate”means, as to any Person, any other Person which, directly or indirectly, is in control of, is controlled by, or is under common control with, such Person or which owns, directly or indirectly, five percent (5%) or more of the outstanding equity interest of such Person. A Person shall be deemed to control another Person if the controlling Person possesses, directly or indirectly, the power to direct or cause the direction of the management and policies of the other Person, whether through the ownership of voting securities, by contract, or otherwise. In no event shall the Agent or any Lender be deemed to be an Affiliate of the Borrower or any of their Subsidiaries.

“Agent”means Bank of America, solely in its capacity as agent for the Lenders, and any successor agent.

“Agent’s Liens”means the Liens in the Collateral granted to the Agent, for the benefit of the Lenders and the Agent pursuant to this Agreement and the other Loan Documents.

“Agent Related Persons”means the Agent, together with its Affiliates, and the officers, directors, employees, counsel, representatives, trustees, agents and attorneys-in-fact of the Agent and such Affiliates.

“Agreement”means the Credit Agreement dated as of August 10, 2016, by and among the Borrower, the Agent, and the other Lenders, as from time to time amended, modified or restated.

“Anti-Corruption Laws”means all laws, rules, and regulations of any jurisdiction applicable to any Loan Party or any of its Subsidiaries from time to time concerning or relating to bribery or corruption.

“Applicable Margin”means,

(a)    with respect to Base Rate Loans, 1.00 % per annum and, as set forth in the pricing grid below; and

(b)    with respect to LIBOR Rate Loans, 2.00% per annum.

“Approved Fund”means any Fund that is administered or managed by (a) a Lender, (b) an Affiliate of a Lender or (c) an entity or an Affiliate of an entity that administers or manages a Lender.

“Assignee”has the meaning specified in Section 11.2(a).

“Assignment and Acceptance”has the meaning specified in Section 11.2(a).

“Attorney Costs”means and includes all reasonable fees, expenses, and disbursements of any law firm or other counsel engaged by the Agent, and the reasonably allocated costs and expenses of internal legal services of the Agent.

“Bail-In Action” means the exercise of any Write-Down and Conversion Powers by the applicable EEA Resolution Authority in respect of any liability of an EEA Financial Institution.

“Bail-In Legislation” means, with respect to any EEA Member Country implementing Article 55 of Directive 2014/59/EU of the European Parliament and of the Council of the European Union, the implementing law for such EEA Member Country from time to time which is described in the EU Bail-In Legislation Schedule.

Annex A - 1

“Bank of America”means Bank of America, N.A., a national banking association, or any successor entity thereto.

“Bankruptcy Code”means Title 11 of the United States Code (11 U.S.C. § 101 et seq.).

“Base Rate”means, for any day, a per annum rate equal to the greatest of (a) the Prime Rate for such day; (b) the Federal Funds Rate for such day, plus 0.50%; or (c) LIBOR Rate for a 30 day interest period as determined on such day, plus 1.0%.

“Base Rate Loan”means, a Loan during any period in which it bears interest based on the Base Rate.

“Beneficial Owner”has the meaning assigned to such term in Rule 13d-3 and Rule 13d5 under the Exchange Act, except that in calculating the beneficial ownership of any particular “person”(as that term is used in Section 13(d)(3) of the Exchange Act), such “person”will be deemed to have beneficial ownership 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 is exercisable only after the passage of time. The terms “Beneficially Owns”and “Beneficially Owned”have corresponding meanings.

“Borrower”has the meaning specified in the preamble to this Agreement.

“Borrower Materials”has the meaning specified in the last paragraph of Section 5.2.

“Borrowing”means a borrowing hereunder consisting of Loans made on the same day by the Lenders to the Borrower.

“Business Day”means (a) any day that is not a Saturday, Sunday, or a day on which banks in Houston, Texas, New York, New York, or Charlotte, North Carolina are required or permitted to be closed, and (b) with respect to all notices, determinations, fundings and payments in connection with the LIBOR Rate or LIBOR Rate Loans, any day that is a Business Day pursuant to clause (a) above and that is also a day on which trading in Dollars is carried on by and between banks in the London interbank market.

“Capital Expenditures”means all payments due (whether or not paid during any fiscal period) in respect of the cost of any fixed asset or improvement, or replacement, substitution, or addition thereto, which has a useful life of more than one year, including, without limitation, those costs arising in connection with the direct or indirect acquisition of such asset by way of increased product or service charges or in connection with a Capital Lease.

“Capital Lease”means any lease of property by a Person which, in accordance with GAAP, should be reflected as a capital lease on the balance sheet of such Person.

“Capital Stock”means (a) in the case of a corporation, capital stock, (b) in the case of an association or business entity, any and all shares, interests, participations, rights, or other equivalents (however designated) of capital stock, (c) in the case of a partnership, partnership interests (whether general or limited), (d) in the case of a limited liability company, membership interests, and (e) any other interest or participation that confers on a Person the right to receive a share of the profits and losses of, or distributions of assets of, the issuing Person.

“Change in Law”means the occurrence, after the date hereof, of (a) the adoption, taking effect or phasing in of any law, rule, regulation or treaty; (b) any change in any law, rule, regulation or treaty or in the administration, interpretation or application thereof; or (c) the making, issuance or application of any request, guideline, requirement or directive (whether or not having the force of law) by any Governmental Authority; provided, however, that “Change in Law” shall include, regardless of the date enacted, adopted or issued, all requests, rules, guidelines, requirements or directives (i) under or relating to the Dodd-Frank Wall Street Reform and Consumer Protection Act, or (ii) promulgated pursuant to Basel III by the Bank for International Settlements, the Basel Committee on Banking Supervision (or any similar authority) or any other Governmental Authority.

“Change of Control”means the Borrower shall cease to be a direct or indirect wholly-owned Subsidiary of Westlake.

“Closing Date”means the date of this Agreement.

“Closing Fee”has the meaning specified in Section 2.4.

“Code”means the Internal Revenue Code of 1986.

Annex A - 2

“Collateral”means, subject to the terms of the Security Agreements, (a)(i) the “Collateral” as defined in the US Security Agreement, and (ii) the “Collateral” as defined in the Dutch Security Agreement; and (b) all other assets of any Person from time to time subject to the Agent’s Liens securing payment or performance of the Obligations.

“Collateral Documents”means all Security Agreements, pledge agreements, financing statements and assignments of partnership interests at any time delivered to the Agent to create or evidence Liens securing the Obligations, together with all reaffirmations, amendments, and modifications thereof or supplements thereto.

“Commitment”means, at any time with respect to a Lender, the principal amount set forth beside such Lender’s name under the heading “Commitment”on Schedule 1.2 attached to the Agreement or on the signature page of the Assignment and Acceptance pursuant to which such Lender became a Lender hereunder in accordance with the provisions of Section 11.2, as such Commitment may be adjusted from time to time in accordance with the provisions of Section11.2, and “Commitments”means, collectively, the aggregate amount of the commitments of all of the Lenders.

“Connection Income Taxes”means Other Connection Taxes that are imposed on or measured by net income (however denominated), or are franchise or branch profits Taxes.

“Continuation/Conversion Date”means the date on which a Loan is converted into or continued as a LIBOR Rate Loan.

“CRR”means Council Regulation (EU) No 575/2013 of the European Parliament and of the Council of 26 June 2013 on prudential requirements for credit institutions and investment firms and amending Regulation (EU) No 648/2012.

“Debt”means, without duplication, all liabilities, obligations, and indebtedness of the Borrower or any Subsidiary to any other Person, of any kind or nature, now or hereafter owing, arising, due or payable, howsoever evidenced, created, incurred, acquired or owing, whether primary, secondary, direct, contingent, fixed or otherwise, consisting of indebtedness for borrowed money, the deferred purchase price of property, or preferred stock or other equity interests that have characteristics of Debt such as, dividend requirements (whether cash or paid in kind) or, in the case of Disqualified Stock, mandatory redemption requirements, excluding trade payables, but including (a) all Obligations; (b) all obligations and liabilities of any Person secured by any Lien on property of the Borrower or any Subsidiary, even though the Borrower or any Subsidiary shall not have assumed or become liable for the payment thereof; provided, however, that all such obligations and liabilities which are limited in recourse to such property shall be included in Debt only to the extent of the book value of such property as would be shown on a balance sheet of such Person prepared in accordance with GAAP; (c) all obligations or liabilities created or arising under any Capital Lease or conditional sale or other title retention agreement with respect to property used or acquired by the Borrower or any Subsidiary, even if the rights and remedies of the lessor, seller or lender thereunder are limited to repossession of such property; provided, however, that all such obligations and liabilities which are limited in recourse to such property shall be included in Debt only to the extent of the book value of such property as would be shown on a balance sheet of Westlake prepared in accordance with GAAP; (d) all obligations and liabilities under Guaranties of another Person of borrowed money; and (e) the present value (discounted at the Base Rate) of lease payments due under synthetic leases.

“Default”means any event or circumstance which, with the giving of notice, the lapse of time, or both, would (if not cured, waived, or otherwise remedied during such time) constitute an Event of Default.

“Default Rate”means a fluctuating per annum interest rate at all times equal to the sum of (a) the otherwise applicable Interest Rate plus (b) two percent (2%) per annum. Each Default Rate shall be adjusted simultaneously with any change in the applicable Interest Rate.

“Defaulting Lender”means any Lender that (a) has failed to comply with its funding obligations hereunder, and such failure is not cured within two Business Days, unless such Lender notifies the Agent and Westlake in writing that such failure is the result of such Lender’s determination that one or more conditions precedent to funding (each of which conditions precedent, together with any applicable default, shall be specifically identified in such writing) has not been satisfied; (b) has notified the Agent or the Borrower that such Lender does not intend to comply with its funding obligations hereunder, or has made a public statement to that effect, unless such writing or public statement relates to such Lender’s obligation to fund a Loan hereunder and states that such position is based on such Lender’s determination that a condition precedent to funding (which condition precedent, together with any applicable default, shall be specifically identified in such writing or public statement) cannot be satisfied; (c) has failed, within three Business Days following request by the Agent or the Borrower, to confirm in a manner satisfactory to the Agent and Borrower that such Lender will comply with its funding obligations hereunder, provided that such Lender shall cease

Annex A - 3

to be a Defaulting Lender pursuant to this clause (c) upon receipt of such written confirmation by the Agent and Westlake; or (d) has, or has a direct or indirect parent company that has (i) become the subject of an Insolvency Proceeding (including reorganization, liquidation, or appointment of a receiver, custodian, administrator or similar Person by the Federal Deposit Insurance Corporation or any other regulatory authority) or (ii) become the subject of a Bail-In Action; provided, however, that a Lender shall not be a Defaulting Lender solely by virtue of a Governmental Authority’s ownership of an equity interest in such Lender or parent company unless the ownership provides immunity for such Lender from jurisdiction of courts within the United States or from enforcement of judgments or writs of attachment on its assets, or permits such Lender or Governmental Authority to repudiate or otherwise to reject such Lender’s agreements.

“Designated Account”has the meaning specified in Section 1.2(c).

“Disqualified Stock”means any Capital Stock that, by its terms (or by the terms of any security into which it is convertible, or for which it is exchangeable, in each case at the option of the holder of the Capital Stock), or upon the happening of any event, matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at the option of the holder of the Capital Stock, in whole or in part, on or prior to the date that is 91 days after the Stated Maturity Date. Notwithstanding the preceding sentence, any Capital Stock that would constitute Disqualified Stock solely because the holders of the Capital Stock have the right to require Westlake to repurchase such Capital Stock upon the occurrence of a change of control or an asset sale will not constitute Disqualified Stock if the terms of such Capital Stock provide that Westlake may not repurchase or redeem any such Capital Stock pursuant to such provisions unless such repurchase or redemption complies with Section 7.10. The amount of Disqualified Stock deemed to be outstanding at any time for purposes of this Agreement will be the maximum amount that the Borrower and its Subsidiaries may become obligated to pay upon the maturity of, or pursuant to any mandatory redemption provisions of, such Disqualified Stock, exclusive of accrued dividends.

“Distribution”means, in respect of any corporation, limited partnership, or limited liability company: (a) the payment or making of any dividend or other distribution of property in respect of capital stock, partnership interest, or membership interest, as applicable (or any options or warrants for, or other rights with respect to, such stock, partnership interest, or membership interest, as applicable) of such corporation, limited partnership, or limited liability company, other than distributions in capital stock, partnership interest, or membership interest, as applicable (or any options or warrants for suchstock, partnership interest, or membership interest, as applicable) of the same class; or (b) the redemption or other acquisition by such corporation, limited partnership, or limited liability company of any capital stock, partnership interest, or membership interest, as applicable (or any options or warrants for such stock, partnership interest, or membership interest, as applicable) of such corporation, limited partnership, or limited liability company.

“Dollar”and “$”means dollars in the lawful currency of the United States. Unless otherwise specified, all payments under this Agreement shall be made in Dollars.

“Dutch Security Agreement”means the security agreement executed by the Loan Parties, the Agent and Westlake International Holdings C.V., pursuant to which the Loan Parties pledge their respective rights under the agreement that governs Westlake International Holdings C.V. to the Agent.

“EEA Financial Institution” means (a) any credit institution or investment firm established in any EEA Member Country which is subject to the supervision of an EEA Resolution Authority, (b) any entity established in an EEA Member Country which is a parent of an institution described in clause (a) of this definition, or (c) any financial institution established in an EEA Member Country which is a Subsidiary of an institution described in clauses (a) or (b) of this definition and is subject to consolidated supervision with its parent.

“EEA Member Country” means any of the member states of the European Union, Iceland, Liechtenstein, and Norway.

“EEA Resolution Authority” means any public administrative authority or any Person entrusted with public administrative authority of any EEA Member Country (including any delegee) having responsibility for the resolution of any EEA Financial Institution.

“Eligible Assignee”means (a) a commercial bank, commercial finance company, or other asset based lender, having total assets in excess of $1,000,000,000; (b) any Lender listed on the signature page of this Agreement; (c) any Affiliate of any Lender; (d) an Approved Fund; and (e) if an Event of Default has occurred and is continuing, any Person reasonably acceptable to the Agent.

Annex A - 4

“Engagement Letter”means that certain letter agreement relating to certain fees and structuring services dated as of August 5, 2016, between Westlake and Bank of America.

“Environmental Laws”means all federal, state or local laws, statutes, common law duties, rules, regulations, ordinances and codes, together with all administrative orders, directed duties,licenses, authorizations and permits of, and agreements with, any Governmental Authority, in each case relating to environmental, health, safety and land use matters.

“Environmental Liability”means any obligation, liability (including, without limitation, any strict liability), loss, fine, penalty, charge, Lien, damage, cost, reasonable attorneys’ and expert fees, or any other expense arising under, or resulting from a violation of any Environmental Law, the presence, Release, or threatened Release of any Hazardous Materials, or actual or threatened damages to natural resources.

“Environmental Lien”means a Lien in favor of any Governmental Authority for (a) any liability under Environmental Laws, or (b) damages arising from, or costs incurred by such Governmental Authority in response to, a Release or threatened Release.

“ERISA”means the Employee Retirement Income Security Act of 1974, and regulations promulgated thereunder.

“ERISA Affiliate”means any trade or business (whether or not incorporated) under common control with any Loan Party within the meaning of Section 414(b) or (c) of the Code (and Sections 414(m) and (o) of the Code for purposes of provisions relating to Section 412 of the Code).

“ERISA Event”means (a) a Reportable Event with respect to a Pension Plan, (b) a withdrawal by any Loan Party or any ERISA Affiliate from a Pension Plan subject to Section 4063 of ERISA during a plan year in which it was a substantial employer (as defined in Section 4001(a)(2) of ERISA) or a cessation of operations which is treated as such a withdrawal under Section 4062(e) of ERISA, (c) a complete or partial withdrawal by any Loan Party or any ERISA Affiliate from a Multi-employer Plan or notification that a Multi-employer Plan is in reorganization, (d) the filing of a notice of intent to terminate, the treatment of a Pension Plan amendment as a termination under Section 4041 or 4041A of ERISA, or the commencement of proceedings by the PBGC to terminate a Pension Plan or Multi-employer Plan, (e) the occurrence of an event or condition which might reasonably be expected to constitute grounds under Section 4042 of ERISA for the termination of, or the appointment of a trustee to administer, any Pension Plan or Multi-employer Plan, (f) the imposition of any liability to PBGC under Title IV of ERISA, other than for PBGC premiums due but not delinquent under Section 4007 of ERISA,upon any Loan Party or any ERISA Affiliate, or (g) a Pension Plan becomes subject to the at-risk requirements in Section 303 of ERISA and Section 430 of the Code.

“EU Bail-In Legislation Schedule” means the EU Bail-In Legislation Schedule published by the Loan Market Association (or any successor person), as in effect from time to time.

“Eurodollar Reserve Percentage”means, for any day during any Interest Period, the reserve percentage (expressed as a decimal, rounded upward to the next 1/100th of 1%) in effect on such day applicable to member banks under regulations issued from time to time by the Federal Reserve Board for determining the maximum reserve requirement (including any emergency, supplemental, or other marginal reserve requirement) with respect to Eurocurrency funding (currently referred to as “Eurocurrency liabilities”). The LIBOR Rate for each outstanding LIBOR Rate Loan shall be adjusted automatically as of the effective date of any change in the Eurodollar Reserve Percentage.

“Event of Default”has the meaning specified in Section 9.1.

“Exchange Act”means the Securities Exchange Act of 1934, and regulations promulgated thereunder.

“Excluded Tax”means (a) Taxes imposed on or measured by a Recipient’s net income (however denominated), franchise Taxes and branch profits Taxes, in each case, (i) imposed as a result of such Recipient being organized under the laws of, or having its principal office or applicable Lending Office located in, the jurisdiction imposing such Tax, or (ii) constituting Other Connection Taxes; (b) U.S. federal withholding Taxes imposed on amounts payable to or for the account of a Lender with respect to its interest in a Loan or Commitment pursuant to a law in effect when the Lender acquires such interest (except pursuant to an assignment requested by Westlake under Section 4.10) or changes its Lending Office, unless the Taxes were payable to its assignor immediately prior to such assignment or to the Lender immediately prior to its change in Lending Office; (c) Taxes attributable to a Recipient’s failure to comply with Section 4.2; and (d) withholding Taxes imposed pursuant to FATCA.

Annex A - 5

“FATCA”means Sections 1471 through 1474 of the Code (including any amended or successor version if substantively comparable and not materially more onerous to comply with), and any current or future regulations or official interpretations thereof, any agreements entered into pursuant to Section 1471(b)(1) of the Code, any published intergovernmental agreement entered into in connection with the implementation of such sections of the Internal Revenue Code and any fiscal or regulatory legislation, rules or official practices adopted pursuant to any such published intergovernmental agreement.

“Federal Funds Rate”means, for any day, (a) the weighted average of interest rates on overnight federal funds transactions with members of the Federal Reserve System on the applicable Business Day (or on the preceding Business Day, if the applicable day is not a Business Day), as published by the Federal Reserve Bank of New York on the next Business Day; or (b) if no such rate is published on the next Business Day, the average rate (rounded up, if necessary, to the nearest 1/8 of 1%) charged to the Agent on the applicable day on such transactions, as determined by the Agent.

“Federal Reserve Board”means the Board of Governors of the Federal Reserve System or any successor thereto.

“Financial Statements”means, according to the context in which it is used, the financial statements referred to in Sections 5.2 and 6.6 or any other financial statements required to be given to the Lenders pursuant to this Agreement.

“Fiscal Year”means the Loan Parties’ fiscal year for financial accounting purposes. The current Fiscal Year of the Loan Parties will end on December 31, 2016.

“Foreign Lender”means any Lender that is not a U.S. Person.

“Foreign Subsidiary”of any Person means a Subsidiary of such Person that is organized or incorporated under the laws of a jurisdiction other than a jurisdiction of the United States.

“Full Payment”means (a) with respect to any Obligations, the full cash payment thereof, including any interest, fees and other charges accruing during any insolvency proceeding under the Bankruptcy Code, or under any other bankruptcy or insolvency law (whether or not allowed in the proceeding) (in each case, other than contingent indemnity and expense reimbursement claims); and (b) the expiration or termination of all Commitments.

“Fund”means any Person (other than a natural person) that is (or will be) engaged in making, purchasing, holding or otherwise investing in commercial loans and similar extensions of credit in the ordinary course of its activities.

“Funding Date”means the date on which a Borrowing occurs.

“GAAP”means generally accepted accounting principles and practices set forth from time to time in the opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board (or agencies with similar functions of comparable stature and authority within the U.S. accounting profession), which are applicable to the circumstances as of the Closing Date.

“Governmental Authority”means any federal, state, local, foreign or other agency, authority, body, commission, court, instrumentality, political subdivision, central bank, or other entity or officer exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions for any governmental, judicial, investigative, regulatory or self-regulatory authority (including the Financial Conduct Authority, the Prudential Regulation Authority and any supra-national bodies such as the European Union or European Central Bank).

“Guaranty”means, with respect to any Person, all obligations of such Person which in any manner directly or indirectly guarantee or assure, or in effect guarantee or assure, the payment or performance of any indebtedness, dividend or other obligations of any other Person (the “guaranteed obligations”), or assure or in effect assure the holder of the guaranteed obligations against loss in respect thereof, including any such obligations incurred through an agreement, contingent or otherwise: (a) to purchase the guaranteed obligations or any property constituting security therefor; (b) to advance or supply funds for the purchase or payment of the guaranteed obligations or to maintain a working capital or other balance sheet condition; or (c) to lease property or to purchase any debt or equity securities or other property or services.

Annex A - 6

“Hazardous Materials”means any material that poses a threat to, or is regulated to protect, human health, safety, public welfare or the environment, including without limitation, “hazardous substance,” “pollutant or contaminant,” “petroleum” and “natural gas liquids,” as those terms are defined or used in Section 101 of the Comprehensive Environmental Response, Compensation,and Liability Act, polychlorinated biphenyls, lead, asbestos, urea formaldehyde, radioactive materials, putrescible materials, infectious materials, and toxic microorganisms (including mold).

“Indemnified Taxes”means (a) Taxes, other than Excluded Taxes, imposed on or relating to any payment of an Obligation; and (b) to the extent not otherwise described in clause (a), Other Taxes.

“Interest Period”means, as to any LIBOR Rate Loan, the period commencing on the Funding Date of such Loan or on the Continuation/Conversion Date on which the Loan is converted into or continued as a LIBOR Rate Loan, and ending on the date three months thereafter, provided that:

(a)    if any Interest Period would otherwise end on a day that is not a Business Day, that Interest Period shall be extended to the following Business Day unless the result of such extension would be to carry such Interest Period into another calendar month, in which event such Interest Period shall end on the preceding Business Day;

(b)    any Interest Period pertaining to a LIBOR Rate Loan that begins on the last Business Day of a calendar month (or on a day for which there is no numerically corresponding day in the calendar month at the end of such Interest Period) shall end on the last Business Day of the calendar month at the end of such Interest Period; and

(c)    no Interest Period shall extend beyond the Stated Maturity Date.

“Interest Rate”means each or any of the interest rates, including the Default Rate, set forth in Section 2.1.

“IRS”means the Internal Revenue Service and any Governmental Authority succeeding to any of its principal functions under the Code.

“Joint Venture”means any joint venture between any Loan Party or any JV Subsidiary and any other Person, if such joint venture is owned 50% or less by the Loan Parties or any JV Subsidiary.

“JV Subsidiary”means each Subsidiary of a Loan Party (a) that, at any time, directly holds a Capital Stock in any Joint Venture and (b) that has no other material assets.

“Lending Office”means the office designated as such by the applicable Lender at the time it becomes party to this Agreement or thereafter by notice to the Agent and the Borrower.

“Lender”and “Lenders”have the meanings specified in the introductory paragraph hereof.

“LIBOR Interest Payment Date”means, with respect to a LIBOR Rate Loan, the Maturity Date and the last day of each Interest Period applicable to such Loan.

“LIBOR Rate”means, for any Interest Period, with respect to LIBOR Rate Loans, the rate of interest per annum determined pursuant to the following formula:

LIBOR Rate =	Offshore Base Rate
	1.00 - Eurodollar Reserve Percentage

“LIBOR Rate Loan”means a Loan during any period in which it bears interest based on the LIBOR Rate.

“Lien”means: (a) any interest in property securing an obligation owed to, or a claim by, a Person other than the owner of the property, whether such interest is based on the common law, statute, or contract, and including a security interest, charge, claim, or lien arising from a mortgage, deed of trust, encumbrance, pledge, hypothecation, assignment, deposit arrangement, agreement, security agreement, conditional sale or trust receipt, or a lease, consignment, or bailment for security purposes; and (b) to the extent not included under clause (a), any reservation,

Annex A - 7

exception, encroachment, easement, right-of-way, covenant, condition, restriction, lease, or other title exception or encumbrance affecting property.

“Loan Documents”means this Agreement, the Notes, the Collateral Documents and any other agreements, instruments, and documents heretofore, now or hereafter evidencing, securing, guaranteeing or otherwise relating to the Obligations, the Collateral, or any other aspect of the transactions contemplated by this Agreement.

“Loan Parties”means the Borrower and Westlake International II LLC.

“Loans”has the meaning specified in Section 1.2.

“Margin Stock”means “margin stock”as such term is defined in Regulation U.

“Material Adverse Effect”means (a) a material adverse change in, or a material adverse effect upon, the assets, liabilities, business, operations, properties, or condition (financial or otherwise) of the Loan Parties and their Subsidiaries taken as a whole or the Collateral; (b) a material impairment of the ability of any Loan Party to perform under any Loan Document to which it is a party; or (c) a material adverse effect upon the legality, validity, binding effect, or enforceability against any Loan Party of any Loan Document to which it is a party.

“Material Agreement”means any agreement or arrangement to which a Loan Party is a party or is bound as of the date thereof (other than the Loan Documents), without duplication, that is deemed to be a material contract under any securities law applicable to such Loan Party, including the Securities Act of 1933.

“Maturity Date”means the earliest to occur of (a) the Stated Maturity Date, (b) the date the Facility is terminated either by the Borrower pursuant to Section 3.2 or by the Required Lenders pursuant to Section 9.2, and (c) the date this Agreement is otherwise terminated for any reason whatsoever pursuant to the terms of this Agreement.

“Maximum Rate”has the same meaning specified in Section 2.3.

“Moody’s”means Moody’s Investors Services, Inc. and any successor thereto.

“Multi-employer Plan”means a “multi-employer plan”as defined in Section 4001(a)(3) of ERISA which is or was at any time during the current year or the immediately preceding five (5) years contributed to by any Loan Party or any ERISA Affiliate.

“Note and Notes”have the same meaning specified in Section 1.2(a)(ii).

“Notice of Borrowing”has the meaning specified in Section 1.2(b).

“Notice of Continuation/Conversion”has the meaning specified in Section 2.2(b).

“Obligations”means all present and future loans, advances, liabilities, obligations, covenants, duties, and debts owing by any Loan Party to the Agent and/or any Lender, arising under or pursuant to this Agreement or any of the other Loan Documents, whether or not evidenced by any note, or other instrument or document, whether arising from an extension of credit, opening of a letter of credit, acceptance, loan, guaranty, indemnification or otherwise, whether direct or indirect, absolute or contingent, due or to become due, primary or secondary, or joint or several, as principal or guarantor, andincluding all principal, interest, charges, expenses, fees, attorneys’ fees, filing fees, and any other sums chargeable to any Loan Party hereunder or under any of the other Loan Documents. “Obligations”includes, without limitation, the principal of, and interest on, all Loans.

“OFAC”means Office of Foreign Assets Control of the U.S. Treasury Department.

“Offshore Base Rate”means for any Interest Period with respect to a LIBOR Rate Loan, the rate per annum equal to the London Interbank Offered Rate (“LIBOR”), or a comparable or successor rate which rate is approved by the Agent, as published on the applicable Bloomberg screen page (or another commercially available source providing quotations of LIBOR as reasonably designated by the Agent) (in such case, the “LIBOR Rate”) at or about 11:00 a.m., London time, two Business Days prior to the commencement of such Interest Period, for deposits in the relevant currency (for delivery on the first day of such Interest Period) with a term equivalent to such Interest Period; provided that to the extent a comparable or successor rate is approved by the Agent in connection herewith, the approved rate shall be applied in a manner consistent with market practice; provided, further that to the extent such market practice is not administratively feasible for the Agent, such approved rate shall be applied in a manner as otherwise reasonably

Annex A - 8

determined by the Agent and if the Offshore Base Rate shall be less than zero, such rate shall be deemed zero for purposes of this Agreement.

“Other Connection Taxes”means Taxes imposed on a Recipient due to a present or former connection between it and the taxing jurisdiction (other than connections arising from the Recipient having executed, delivered, become party to, performed obligations or received payments under, received or perfected a Lien or engaged in any other transaction pursuant to, enforced, or sold or assigned an interest in, any Loan or Loan Document).

“Other Taxes”means all present or future stamp, court, documentary, intangible, recording, filing or similar Taxes that arise from any payment made under, from the execution, delivery, performance, enforcement or registration of, from the receipt or perfection of a Lien under, or otherwise with respect to, any Loan Document, except Other Connection Taxes imposed with respect to an assignment (other than an assignment made pursuant to Section 4.10).

“Participant”means any Person who shall have been granted the right by any Lender to participate in the financing provided by such Lender under this Agreement, and who shall have entered into a participation agreement in form and substance satisfactory to such Lender.

“PBGC”means the Pension Benefit Guaranty Corporation or any Governmental Authority succeeding to the functions thereof.

“Pension Plan”means a pension plan (as defined in Section 3(2) of ERISA) subject to Title IV of ERISA which any Loan Party or any ERISA Affiliate sponsors, maintains, or to which it makes, is making, or is obligated to make contributions, or in the case of a Multi-employer Plan has made contributions at any time during the immediately preceding five (5) plan years.

“Permitted Group”means any group of investors that is deemed to be a “person”(as that term is used in Section 13(d)(3) of the Exchange Act) at any time prior to Westlake’s initial public offering of common stock, provided that no single Person (other than the Principals and their Related Parties) Beneficially Owns (together with its Affiliates) more of the Voting Stock of the Borrower that is Beneficially Owned by such group of investors than is then collectively Beneficially Owned by the Principals and their Related Parties in the aggregate.

“Permitted Liens”means:

(a)    Liens for taxes or statutory Liens for taxes, assessments and other governmental charges, provided that (i) the payment of which is not yet due and payable, or (ii) the payment of such taxes or governmental charges which are due and payable is being contested in good faith and by appropriate proceedings diligently pursued and as to which adequate financial reserves have been established on the applicable Loan Party’s books and records;

(b)    the Agent’s Liens;

(c)    Liens consisting of deposits made in the ordinary course of business in connection with, or to secure payment of, obligations under workers’ compensation, unemployment insurance, social security, and other similar laws, or to secure the performance of bids, tenders, or contracts (other than for the repayment of Debt), or to secure indemnity, performance or other similar bonds for the performance of bids, tenders or contracts (other than for the repayment of Debt), or to secure statutory obligations (other than liens arising under ERISA or Environmental Liens) or surety or appeal bonds, or to secure indemnity, performance or other similar bonds;

(d)    Liens securing the claims or demands of materialmen, mechanics, carriers, rail carriers, warehousemen, landlords, and other like Persons arising in the ordinary course of business, provided that if any such Lien arises from the nonpayment of such claims or demands when due, such claims or demands do not exceed $2,500,000 in the aggregate and do not create Liens on the Collateral, unless any such claims or demands are being contested in good faith and by appropriate proceedings diligently pursued promptly after knowledge thereof and as to which adequate financial reserves have been established on the applicable Loan Party’s books and records;

(e)    Liens constituting encumbrances in the nature of reservations, exceptions, encroachments, easements, rights of way, covenants running with the land, and other similar title exceptions or encumbrances

Annex A - 9

affecting any Real Estate; provided that they do not in the aggregate materially detract from the value of the Real Estate or materially interfere with its use in the ordinary conduct of the applicable Loan Party’s business;

(f)    Liens arising from judgments and attachments in connection with court proceedings, provided that the attachment or enforcement of such Liens would not result in an Event of Default hereunder and such Liens are being contested in good faith by appropriate proceedings, adequate reserves have been set aside and no material property is subject to a material risk of loss or forfeiture and the claims in respect of such Liens are fully covered by insurance (subject to ordinary and customary deductibles) and a stay of execution pending appeal or proceeding for review is in effect;

(g)    the interest of a lessor or a licensor under an operating lease or license under which a Loan Party is lessee, sublessee or licensee, including protective financing statement filings;

(h)    Liens securing Debt existing on the Closing Date to the extent such Liens are described on Schedule 7.12;

(i)    Liens evidencing consignments of inventory;

(j)    Liens on property of a Person existing at the time such Person becomes a Subsidiary or is merged with or into or consolidated with any Loan Party or any of its Subsidiaries; provided that such Liens were in existence prior to the contemplation of such acquisition, merger or consolidation and do not extend to any assets other than those of the Person merged into or consolidated with any Loan Party or that becomes a Subsidiary;

(k)    So long as such transactions are otherwise permitted under this Agreement, (i) Liens upon or in property acquired (including acquisitions through merger or consolidation) or constructed or improved by any such Loan Party or any of its Subsidiaries including general tangibles, proceeds and improvements, accessories and upgrades thereto, and created contemporaneously with, or within twelve (12) months after, such acquisition or the completion of construction or improvement to secure or provide for the payment of all or a portion of the purchase price of such property or the cost of construction or improvement thereof (including any Indebtedness incurred to finance such acquisition, construction or improvement), as the case may be, (ii) Liens on property (including any unimproved portion of partially improved property) of such Loan Party or any of its Subsidiaries created within twelve (12) months of completion of construction of a new plan or plans on such property to secure all or part of the cost of such construction (including any Indebtedness incurred to finance such construction) if, in the opinion of such Loan Party or such Subsidiary, such property or such portion thereof was prior to such construction substantially unimproved for the use intended by such Loan Party or such Subsidiary; and (iii) in the case of Capital Leases, Liens on the assets subject to such Capitalized Leases and proceeds (including, without limitation, proceeds from associated contracts and insurances) of, and improvements, accessories and upgrades to, the property leased pursuant thereto; provided, however, in each of the foregoing clauses (i), (ii), and (iii), no such Lien shall extend to or cover any property other than the property being acquired, constructed, improved or leased (including any unimproved portion of a partially improved property) including general intangibles, proceeds and improvements, accessories and upgrades thereto;

(l)    Liens on property existing at the time of acquisition of such property, provided that such Liens were in existence prior to, and not incurred in contemplation of, such acquisition; and

(m)    any Lien arising under article 24 and 25 of the general terms and conditions (algemene voorwaarden) of any member of the Dutch Bankers' association (Nederlandse Vereniging van Banken).

“Person”means any individual, sole proprietorship, partnership, limited liability company, joint venture, trust, unincorporated organization, association, corporation, Governmental Authority, or any other entity.

“Platform”has the meaning specified in Section 13.8.

“Prime Rate”means the rate of interest announced by Bank of America from time to time as its prime rate. Such rate is set by Bank of America on the basis of various factors, including its costs and desired return, general economic conditions and other factors, and is used as a reference point for pricing some loans, which may be priced at, above or below such rate. Any change in such rate announced by Bank of America shall take effect at the opening of business on the day specified in the public announcement of such change.

Annex A - 10

“Principals”means the descendents of T.T. Chao, including by adoption, and the spouses of any such individuals.

“Pro Rata Share”means, with respect to a Lender, a fraction (expressed as a percentage), the numerator of which is the amount of such Lender’s Commitment and the denominator of which is the sum of the amounts of all of the Lenders’ Commitments, or if no Commitments are outstanding, a fraction (expressed as a percentage), the numerator of which is the amount of Obligations owed to such Lender and the denominator of which is the aggregate amount of the Obligations owed to the Lenders.

“Real Estate”means all of any Loan Party’s now or hereafter owned or leased estates in real property, including, without limitation, all fees, leaseholds and future interests, together with all of any Loan Party’s now or hereafter owned or leased interests in the improvements thereon, the fixtures attached thereto, and the easements appurtenant thereto.

“Recipient”means the Agent any Lender or any other recipient of a payment to be made by a Loan Party under a Loan Document or on account of an Obligation.

“Related Party”means (a) any controlling stockholder, 80% (or more) owned Subsidiary, or immediate family member (in the case of an individual) of any Principal or (b) any Person, the beneficiaries, stockholders, partners, owners, or Persons beneficially holding a 50% or more controlling interest of which consist of any one or more Principals and/or such other Persons referred to in the immediately preceding clause (a).

“Release”means a release, spill, emission, leaking, pumping, injection, deposit, disposal, discharge, dispersal, leaching, or migration of any Hazardous Materials into the environment, including the movement of Hazardous Materials through or in the air, soil, surface water, groundwater or Real Estate or other property.

“Reportable Event”means, any of the events set forth in Section 4043(b) of ERISA or the regulations thereunder, other than any such event for which the 30-day notice requirement under ERISA has been waived in regulations issued by the PBGC.

“Required Lenders”means at any time Lenders whose Pro Rata Shares aggregate more than 50%; provided, however, that the Commitments and Loans of any Defaulting Lender shall be excluded from such calculation.

“Requirement of Law”means, as to any Person, any law (statutory or common), treaty, rule or regulation or determination of an arbitrator or of a Governmental Authority, in each case applicable to or binding upon the Person or any of its property or to which the Person or any of its property is subject.

“Responsible Officer”means the chief executive officer, president, chief financial officer, treasurer, assistant treasurer, or controller of a Loan Party. Any document delivered hereunder that is signed by a Responsible Officer of a Loan Party shall be conclusively presumed to have been authorized by all necessary corporate, limited liability company, and/or other action on the part of such Loan Party and such Responsible Officer shall be conclusively presumed to have acted on behalf of such Loan Party.

“S&P”means S&P Global Ratings and any successor thereto.

“Sanction”means any international economic sanction administered or enforced by the United States Government (including OFAC), the United Nations Security Council, the European Union, Her Majesty’s Treasury or other relevant sanctions authority.

“Sanctioned Country”means, at any time, a country or territory which is itself the subject or target of any Sanctions (at the time of this Agreement, Cuba, Iran, North Korea, Sudan and Syria).

“Sanctioned Person” means, at any time, (a) any Person listed in any Sanctions-related list of designated Persons maintained by OFAC, the U.S. Department of State, or by the United Nations Security Council, the European Union or any European Union member state, (b) any Person operating without authorization from the appropriate Governmental Authority, organized or resident in a Sanctioned Country or (c) any Person owned or controlled by any such Person or Persons described in the foregoing clauses (a) or (b).

“SEC”means the Securities and Exchange Commission, or any Governmental Authority succeeding to any of its principal functions.

Annex A - 11

“Security Agreements”means, collectively, the US Security Agreement and the Dutch Security Agreement, each executed by the applicable Loan Parties and, in the case of the Dutch Security Agreement, Westlake International Holdings C.V. in favor of the Agent for the benefit of the Agent and the other Lenders, as amended, restated, amended and restated, or otherwise modified from time to time.

“Solvent”means, when used with respect to any Person, that at the time of determination:

(a)    the assets of such Person, at a fair valuation, are in excess of the total amount of its debts (including contingent liabilities); and

(b)    the present fair saleable value of its assets is greater than its probable liability on its existing debts as such debts become absolute and matured; and

(c)    it is then able and expects to be able to pay its debts (including contingent debts and other commitments) as they mature; and

(d)    it has capital sufficient to carry on its business as conducted and as proposed to be conducted.

For purposes of determining whether a Person is Solvent, the amount of any contingent liability shall be computed as the amount that, in light of all the facts and circumstances existing at such time, represents the amount that can reasonably be expected to become an actual or matured liability of such Person.

Notwithstanding the foregoing, debt of any Loan Party owed to any other Loan Party shall not be included for purposes of calculating whether a Loan Party is Solvent, so long as the Loan Parties, on a consolidated basis, were, are, and will be Solvent.

“Stated Maturity Date”means March 31, 2017.

“Subsidiary”of a Person means (a) any entity of which more than fifty percent (50%) of the Voting Stock is owned or controlled directly or indirectly by the Person, or one or more of the Subsidiaries of such Person (or any combination thereof) or (b) any partnership (i) the sole general partner or the managing general partner of which is such Person or a Subsidiary of such Person or (ii) the only general partners of which are that Person or one or more Subsidiaries of that Person (or any combination thereof). Unless the context otherwise clearly requires, references herein to a “Subsidiary”refer to a Subsidiary of the Borrower.

“Taxes”means all present or future taxes, levies, imposts, duties, deductions, withholdings, assessments, fees or other charges imposed by any Governmental Authority, including any interest, additions to tax or penalties applicable thereto.

“Tangible Assets”means the total consolidated assets, less goodwill and intangibles, of the Loan Parties, as determined in accordance with GAAP and reported in accordance with this Agreement.

“UCC”means the Uniform Commercial Code, as in effect from time to time, of the State of New York or of any other state the laws of which are required as a result thereof to be applied in connection with the issue of perfection of security interests; provided that to the extent that the UCC is used to define any term herein or in any other documents and such term is defined differently in different Articles or Divisions of the UCC, the definition of such term contained in Article or Division 9 shall govern.

“Unfunded Pension Liability”means the excess, if any, of (a) the funding target as defined under Section 430(d) of the Code without regard to the special at-risk rules of Section 430(i) of the Code; over (b) the value of plan assets as defined under Section 430(g)(3)(A) of the Code determined as of the last day of each calendar year, without regard to the averaging which may be allowed under Section 430(g)(3)(B) of the Code and reduced for any prefunding balance or funding standard carryover balance as defined and provided for in Section 430(f) of the Code.

“U.S. Person”means “United States Person” as defined in Section 7701(a)(30) of the Code.

“U.S. Tax Compliance Certificate”has the meaning specified in Section 4.2(b)(ii)(C).

“US Security Agreement”means the security agreement executed by the Borrower, pursuant to which the Borrower pledges its ownership interests in Westlake International II LLC to the Agent for the benefit of the Agent and the other Lenders.

Annex A - 12

“Voting Stock”of any Person as of any date means the Capital Stock of such Person that is at the time entitled to vote in the election of the board of directors of such Person.

“Westlake” means Westlake Chemical Corporation, a Delaware corporation.

“Withholding Agent” means any Loan Party and the Agent.

“Write-Down and Conversion Powers” means, with respect to any EEA Resolution Authority, the write-down and conversion powers of such EEA Resolution Authority from time to time under the Bail-In Legislation for the applicable EEA Member Country, which write-down and conversion powers are described in the EU Bail-In Legislation Schedule.

Accounting Terms. Any accounting term used in the Agreement shall have, unless otherwise specifically provided herein, the meaning customarily given in accordance with GAAP, and all financial computations in the Agreement shall be computed, unless otherwise specifically provided therein, in accordance with GAAP as consistently applied and using the same method for inventory valuation as used in the preparation of the Financial Statements. If at any time any change in GAAP would affect the computation of any financial ratio or requirement set forth in any Loan Document, and either the Borrower or the Required Lenders shall so request, the Agent, the Lenders, and the Borrower shall negotiate in good faith to amend such ratio or requirement to preserve the original intent thereof in light of such change in GAAP (subject to the approval of the Required Lenders); provided that, until so amended, (a) such ratio or requirement shall continue to be computed in accordance with GAAP prior to such change therein and (b) the Borrower shall provide to the Agent and the Lenders Financial Statements and other documents required under this Agreement or as reasonably requested hereunder setting forth a reconciliation between calculations of such ratio or requirement made before and after giving effect to such change in GAAP.

Interpretive Provisions.

(a)    The meanings of defined terms are equally applicable to the singular and plural forms of the defined terms.

(b)    The words “hereof,”“herein,” “hereunder”and similar words refer to the Agreement as a whole and not to any particular provision of the Agreement; and Subsection, Section, Schedule and Exhibit references are to the Agreement unless otherwise specified.

(c)    (i)    The term “documents”includes any and all instruments, documents, agreements, certificates, indentures, notices and other writings, however evidenced.

(ii)    The term “including” is not limiting and means “including without limitation.”

(iii)    In the computation of periods of time from a specified date to a later specified date, the word “from”means “from and including,”the words “to”and “until”each mean “to but excluding”and the word “through”means “to and including.”

(iv)    The word “or”is not exclusive.

(d)    Unless otherwise expressly provided herein, (i) references to agreements (including the Agreement) and other contractual instruments shall be deemed to include all subsequent amendments and other modifications thereto, but only to the extent such amendments and other modifications are not prohibited by the terms of any Loan Document, and (ii) references to any statute or regulation are to be construed as including all statutory and regulatory provisions consolidating, amending, replacing, supplementing or interpreting the statute or regulation.

(e)    The captions and headings of the Agreement and other Loan Documents are for convenience of reference only and shall not affect the interpretation of the Agreement.

(f)    The Agreement and other Loan Documents may use several different limitations, tests or measurements to regulate the same or similar matters. All such limitations, tests and measurements are cumulative and shall each be performed in accordance with their terms.

(g)    For purposes of Section 9.1, a breach of the financial covenant contained in Section 7.14 shall be deemed to have occurred as of any date of determination thereof by the Agent or as of the last day of

Annex A - 13

any specified measuring period, regardless of when the Financial Statements reflecting such breach are delivered to the Agent.

(h)    The Agreement and the other Loan Documents are the result of negotiations among and have been reviewed by counsel to the Agent, the Borrower and the other parties, and are the products of all parties. Accordingly, they shall not be construed against the Lenders or the Agent merely because of the Agent’s or Lenders’ involvement in their preparation.

Annex A - 14

EXHIBIT A

FORM OF NOTE

$ _____________________    __________, 2016

For Value Received, the undersigned (referred to herein as the “Borrower”) hereby jointly and severally promise to pay to the order of _________________ (the “Lender”) in care of Bank of America, N.A. (the “Agent”), at the Agent’s office located at 901 Main Street, Dallas, Texas, 75202, for the account of the Lender, the lesser of the principal amount of __________________ ($ ______________) or the aggregate amount of all outstanding Loans made to Borrower by the Lender from time to time. The undersigned also promise to pay interest on the unpaid principal amount of each Borrowing from the date of such Borrowing until such principal amount is paid. This Note shall be subject to the terms of that certain Credit Agreement described below (the “Credit Agreement”), and all principal and interest payable hereunder shall be due and payable in accordance with the terms of the Credit Agreement.

This Note is the Note referred to in the Credit Agreement, dated as of August 10, 2016, among the Borrower, the Lender, certain other Lenders party thereto, and Bank of America, N.A., as Agent for the Lenders, as amended, renewed, and refinanced from time to time. Terms defined in the Credit Agreement are used herein with the same meanings. The Credit Agreement, among other things, contains provisions for acceleration of the maturity of this Note, upon the happening of certain stated events and also for prepayments on account of the principal of this Note prior to the maturity of this Note upon the terms and conditions specified in the Credit Agreement. Without limiting the immediately preceding sentence, reference is made to Section 2.3 of the Credit Agreement for usury savings provisions.

Principal and interest payments shall be in money of the United States of America, lawful at such times for the satisfaction of public and private debts, and shall be in immediately available funds.

The Borrower promises to pay the costs of collection, including reasonable attorney’s fees, if default is made in the payment of this Note.

THIS NOTE AND THE OTHER LOAN DOCUMENTS HAVE BEEN ENTERED INTO PURSUANT TO SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW AND THE SUBSTANTIVE LAWS OF THE STATE OF NEW YORK, AND THE APPLICABLE FEDERAL LAWS OF THE UNITED STATES OF AMERICA SHALL GOVERN THE VALIDITY, CONSTRUCTION, ENFORCEMENT, AND INTERPRETATION HEREOF.

IN WITNESS WHEREOF, the undersigned have caused this Note to be executed by officers thereunto duly authorized and directed by appropriate corporate authority.

[Remainder of Page Intentionally Left Blank; Signatures Follow]

Exhibit A - 1

BORROWER:

WESTLAKE INTERNATIONAL HOLDINGS II C.V., ACTING THROUGH WESTLAKE OLEFINS CORPORATION, ITS GENERAL PARTNER

By: __________________________________________

Name:  

Title:

Exhibit A - 2

EXHIBIT B

[Reserved]

Exhibit B - 1

EXHIBIT C

[Reserved]

Exhibit C - 1

EXHIBIT D

FORM OF NOTICE OF BORROWING

Date: _______________, 20__

To: BANK OF AMERICA, N.A., individually as a Lender and as agent for itself and the other Lenders (the “Agent”) under that certain Credit Agreement dated as of August 10, 2016 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit Agreement”), by and among the Agent, Westlake International Holding II C.V. (the “Borrower”), acting through Westlake Olefins Corporation, its general partner, and the Lenders party thereto.

Ladies and Gentlemen:    

The undersigned refers to the Credit Agreement, the terms defined therein being used herein as therein defined, and hereby gives you notice irrevocably of the Borrowing specified below:

1. The Business Day of the proposed Borrowing is ______ __, 20__.

2. The aggregate amount of the proposed Borrowing is $ _________.

3. The Borrowing is to be comprised of $ ______ of Base Rate and $ ______ of LIBOR Rate Loans.

The undersigned hereby certifies that the following statements are true on the date hereof, and will be true on the date of the proposed Borrowing, before and after giving effect thereto and to the application of the proceeds therefrom:

(a)    The representations and warranties of the Loan Parties contained in the Credit Agreement are true and correct as though made on and as of such date and except to the extent that the Agent and the Lenders have been notified in writing by the Borrower that any representation or warranty is not correct and the Required Lenders have explicitly waived in writing compliance with such representation or warranty; and

(b)    No Default or Event of Default has occurred and is continuing, or would result from such proposed Borrowing.

IN WITNESS WHEREOF, Westlake has caused this Notice of Borrowing to be executed and delivered on this ___ day of _________, 20__.

[Signature Page Follows]

Exhibit D - 1

IN WITNESS WHEREOF, the Borrower has caused this Notice of Borrowing to be executed and delivered on this ___ day of _________, 20__.

WESTLAKE INTERNATIONAL HOLDINGS II C.V., ACTING THROUGH WESTLAKE OLEFINS CORPORATION, ITS GENERAL PARTNER

By: __________________________________________

Name:  

Title:

Exhibit D - 2

EXHIBIT E

FORM OF NOTICE OF CONTINUATION/CONVERSION

Date: _______________, 20__

To: BANK OF AMERICA, N.A., individually as a Lender and as agent for itself and the other Lenders (the “Agent”) under that certain Credit Agreement dated as of August 10, 2016 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit Agreement”), by and among the Agent, Westlake International Holdings II C.V. (the “Borrower”), acting through Westlake Olefins Corporation, its general partner, and the Lenders party thereto.

Ladies and Gentlemen:

The undersigned refers to the Credit Agreement, the terms defined therein being used herein as therein defined, and hereby gives you notice irrevocably of the [conversion] [continuation] of the Loans specified herein, that:

1. The Continuation/Conversion Date is ______, 20__.

2. The aggregate amount of the Loans to be [converted] [continued] is $ _________.

3. The Loans are to be [converted into] [continued as] [LIBOR Rate] [Base Rate] Loans.

The undersigned hereby certifies that the following statements are true on the date hereof, and will be true on the proposed Continuation/Conversion Date, before and after giving effect thereto and to the application of the proceeds therefrom:

Exhibit E - 1

IN WITNESS WHEREOF, the Borrower has caused this Notice of Continuation/Conversion to be executed and delivered on this ____ day of ____________, 20__.

WESTLAKE INTERNATIONAL HOLDINGS II C.V., ACTING THROUGH WESTLAKE OLEFINS CORPORATION, ITS GENERAL PARTNER

By: __________________________________________

Name:

Title:

Exhibit E - 2

EXHIBIT F

ASSIGNMENT AND ACCEPTANCE AGREEMENT

This ASSIGNMENT AND ACCEPTANCE AGREEMENT (this “Assignment and Acceptance”) dated as of    , ____________________, 20__ is made between __________________ (the “Assignor”) and __________________ (the “Assignee”).

RECITALS

WHEREAS, the Assignor is party to that certain Credit Agreement dated as of __________, 2016 (as amended, amended and restated, modified, supplemented, or renewed, the “Credit Agreement”) by and among Westlake International Holdings II C.V. (the “Borrower”), acting through Westlake Olefins Corporation, its general partner, the several financial institutions from time to time party thereto (including the Assignor, the “Lenders”), and Bank of America, N.A., as agent for the Lenders (the “Agent”). Any terms defined in the Credit Agreement and not defined in this Assignment and Acceptance are used herein as defined in the Credit Agreement;

WHEREAS, as provided under the Credit Agreement, the Assignor has committed to make Loans (the “Revolving Committed Loans”) to the Borrower in an aggregate amount not to exceed $_________ (the “Revolving Commitment”);

WHEREAS, the Assignor has made Loans in the aggregate principal amount of $_________ to the Borrower; and

WHEREAS, the Assignor wishes to assign to the Assignee [part of the] [all] rights and obligations of the Assignor under the Credit Agreement in respect of its Revolving Commitment, together with a corresponding portion of each of its outstanding Revolving Committed Loans, in an aggregate amount equal to $_________ (the “Assigned Amount”) on the terms and subject to the conditions set forth herein and the Assignee wishes to accept assignment of such rights and to assume such obligations from the Assignor on such terms and subject to such conditions;

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, the parties hereto agree as follows:

1.    Assignment and Acceptance.

(a)    Subject to the terms and conditions of this Assignment and Acceptance, (i) the Assignor hereby sells, transfers, and assigns to the Assignee, and (ii) the Assignee hereby purchases, assumes, and undertakes from the Assignor, without recourse and without representation or warranty (except as provided in this Assignment and Acceptance) __% (the “Assignee’s Percentage Share”) of (A) the Revolving Commitment and the Revolving Committed Loans of the Assignor and (B) all related rights, benefits, obligations, liabilities, and indemnities of the Assignor under and in connection with the Credit Agreement and the Loan Documents.

(b)    With effect on and after the Effective Date (as defined in Section 5 hereof), the Assignee shall be a party to the Credit Agreement and succeed to all of the rights and be obligated to perform all of the obligations of a Lender under the Credit Agreement, including the requirements concerning confidentiality and the payment of indemnification, with a Revolving Commitment in an amount equal to the Assigned Amount. The Assignee agrees that it will perform in accordance with their terms all of the obligations which by the terms of the Credit Agreement are required to be performed by it as a Lender. It is the intent of the parties hereto that the Revolving Commitment of the Assignor shall, as of the Effective Date, be reduced by an amount equal to the Assigned Amount, and the Assignor shall relinquish its rights and be released from its obligations under the Credit Agreement to the extent such obligations have been assumed by the Assignee; provided, however, the Assignor shall not relinquish its rights under Sections 3.7, 4, and 13.11 of the Credit Agreement to the extent such rights relate to the time prior to the Effective Date.

(c)    After giving effect to the assignment and assumption set forth herein, on the Effective Date the Assignee’s Revolving Commitment will be $_________ and Revolving Committed Loans will be $_________.

(d)    After giving effect to the assignment and assumption set forth herein, on the Effective Date the Assignor’s Revolving Commitment will be $_________ and Revolving Committed Loans will be $_________.

Exhibit F - 1

2.    Payments.

(a)    As consideration for the sale, assignment, and transfer contemplated in Section 1 hereof, the Assignee shall pay to the Assignor on the Effective Date in immediately available funds an amount equal to the purchase price agreed between the Assignor and the Assignee for the Assigned Amount.

(b)    The [Assignor] [Assignee] further agrees to pay to the Agent a processing fee in the amount specified in Section 11.2(a) of the Credit Agreement.

3.    Reallocation of Payments.

Any interest, fees, and other payments accrued to the Effective Date with respect to the Revolving Commitment and Revolving Committed Loans shall be for the account of the Assignor. Any interest, fees, and other payments accrued on and after the Effective Date with respect to the Assigned Amount shall be for the account of the Assignee. Each of the Assignor and the Assignee agrees that it will hold in trust for the other party any interest, fees, and other amounts which it may receive to which the other party is entitled pursuant to the preceding sentence and pay to the other party any such amounts which it may receive promptly upon receipt.

4.    Independent Credit Decision.

The Assignee (a) acknowledges that it has received a copy of the Credit Agreement and the Schedules and Exhibits thereto, together with copies of the most recent Financial Statements of the Loan Parties, and such other documents and information as it has deemed appropriate to make its own credit and legal analysis and decision to enter into this Assignment and Acceptance; and (b) agrees that it will, independently and without reliance upon the Assignor, the Agent, or any other Lender and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit and legal decisions in taking or not taking action under the Credit Agreement.

5.    Effective Date; Notices.

(a)    As between the Assignor and the Assignee, the effective date for this Assignment and Acceptance shall be __________, 20__ (the “Effective Date”); provided that the following conditions precedent have been satisfied on or before the Effective Date:

(i)    this Assignment and Acceptance shall be executed and delivered by the Assignor and the Assignee;

(ii)    the consent of the Agent (if necessary) required for an effective assignment of the Assigned Amount by the Assignor to the Assignee shall have been duly obtained and shall be in full force and effect as of the Effective Date;

(iii)    the Assignee shall pay to the Assignor all amounts due to the Assignor under this Assignment and Acceptance;

(iv)    the Assignee shall have complied with Section 11.2 of the Credit Agreement (if applicable);

(v)    the processing fee referred to in Section 2(b) hereof and in Section 11.2(a) of the Credit Agreement shall have been paid to the Agent; and

(b)    Promptly following the execution of this Assignment and Acceptance, the Assignor shall deliver to the Borrower and the Agent for acknowledgment by the Agent, a Notice of Assignment in the form attached hereto as Schedule 1.

6.    Agent.

(a)    The Assignee hereby appoints and authorizes the Agent to take such action as agent on its behalf and to exercise such powers under the Credit Agreement as are delegated to the Agent by the Lenders pursuant to the terms of the Credit Agreement.

[INCLUDE (b) ONLY IF ASSIGNOR IS AGENT]

(b)    [The Assignee shall assume no duties or obligations held by the Assignor in its capacity as Agent under the Credit Agreement.]

Exhibit F - 2

7.    Withholding Tax.

The Assignee (a) represents and warrants to the Agent and the Borrower that under applicable law and treaties no tax will be required to be withheld by the Agent or the Borrower with respect to any payments to be made to the Assignee hereunder, (b) agrees to furnish (if it is organized under the laws of any jurisdiction other than the United States or any State thereof) to the Agent and the Borrower prior to the time that the Agent or the Borrower is required to make any payment of principal, interest, or fees in respect of the interest assigned hereunder, duplicate executed originals of either U.S. Internal Revenue Service Form W-8ECI, U.S. Internal Revenue Service Form W-8BEN (wherein the Assignee claims entitlement to the benefits of a tax treaty that provides for a complete exemption from U.S. federal income withholding tax on all payments hereunder), Form W-8IMY and all required supporting documents, or Form W-9 or such other documentation or information prescribed by Requirement of Law (if the Assignee is a “United States person” within the meaning of Section 7701(a)(30) of the Code) and agrees to provide new Forms W-8ECI, W-8BEN, W-8IMY and all required supporting documents, or W-9 or such other documentation or information prescribed by Requirement of Law upon the expiration of any previously delivered form or comparable statements in accordance with applicable U.S. law and regulations and amendments thereto, duly executed and completed by the Assignee, and (c) agrees to comply with all applicable U.S. laws and regulations with regard to such withholding tax exemption.

8.    Representations and Warranties.

(a)    The Assignor represents and warrants that (i) it is the legal and beneficial owner of the interest being assigned by it hereunder and that such interest is free and clear of any Lien or other adverse claim; (ii) it is duly organized and existing and it has the full power and authority to take, and has taken, all action necessary to execute and deliver this Assignment and Acceptance and any other documents required or permitted to be executed or delivered by it in connection with this Assignment and Acceptance and to fulfill its obligations hereunder; (iii) no notices to, or consents, authorizations, or approvals of, any Person are required (other than any already given or obtained) for its due execution, delivery, and performance of this Assignment and Acceptance, and apart from any agreements or undertakings or filings required by the Credit Agreement, no further action by, or notice to, or filing with, any Person is required of it for such execution, delivery, or performance; and (iv) this Assignment and Acceptance has been duly executed and delivered by it and constitutes the legal, valid, and binding obligation of the Assignor, enforceable against the Assignor in accordance with the terms hereof, subject, as to enforcement, to bankruptcy, insolvency, moratorium, reorganization, and other laws of general application relating to or affecting creditors’ rights and to general equitable principles.

(b)    The Assignor makes no representation or warranty and assumes no responsibility with respect to any statements, warranties, or representations made in or in connection with the Credit Agreement or the execution, legality, validity, enforceability, genuineness, sufficiency, or value of the Credit Agreement or any other instrument or document furnished pursuant thereto. The Assignor makes no representation or warranty in connection with, and assumes no responsibility with respect to, the solvency, financial condition, or statements of the Companies, or the performance or observance by any Loan Party of any of its respective obligations under the Credit Agreement or any other instrument or document furnished in connection therewith.

(c)    The Assignee represents and warrants that (i) it is duly organized and existing and it has full power and authority to take, and has taken, all action necessary to execute and deliver this Assignment and Acceptance and any other documents required or permitted to be executed or delivered by it in connection with this Assignment and Acceptance, and to fulfill its obligations hereunder; (ii) no notices to, or consents, authorizations, or approvals of, any Person are required (other than any already given or obtained) for its due execution, delivery, and performance of this Assignment and Acceptance; and apart from any agreements or undertakings or filings required by the Credit Agreement, no further action by, or notice to, or filing with, any Person is required of it for such execution, delivery, or performance; (iii) this Assignment and Acceptance has been duly executed and delivered by it and constitutes the legal, valid, and binding obligation of the Assignee, enforceable against the Assignee in accordance with the terms hereof, subject, as to enforcement, to bankruptcy, insolvency, moratorium, reorganization, and other laws of general application relating to or affecting creditors’ rights and to general equitable principles; and (iv) it is an Eligible Assignee.

9.    Further Assurances.

The Assignor and the Assignee each hereby agree to execute and deliver such other instruments, and take such other action, as either party may reasonably request in connection with the transactions contemplated by this

Exhibit F - 3

Assignment and Acceptance, including the delivery of any notices or other documents or instruments to the Borrower or the Agent, which may be required in connection with the assignment and assumption contemplated hereby.

10.    Miscellaneous.

(a)    Any amendment or waiver of any provision of this Assignment and Acceptance shall be in writing and signed by the parties hereto. No failure or delay by either party hereto in exercising any right, power, or privilege hereunder shall operate as a waiver thereof and any waiver of any breach of the provisions of this Assignment and Acceptance shall be without prejudice to any rights with respect to any other or further breach thereof.

(b)    All payments made hereunder shall be made without any set-off or counterclaim.

(c)    The Assignor and the Assignee shall each pay its own costs and expenses incurred in connection with the negotiation, preparation, execution, and performance of this Assignment and Acceptance.

(d)    This Assignment and Acceptance may be executed in any number of counterparts and all of such counterparts taken together shall be deemed to constitute one and the same instrument.

(e)    THIS ASSIGNMENT AND ACCEPTANCE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK. The Assignor and the Assignee each irrevocably submits to the non-exclusive jurisdiction of any State or Federal court sitting in Texas over any suit, action, or proceeding arising out of or relating to this Assignment and Acceptance and irrevocably agrees that all claims in respect of such action or proceeding may be heard and determined in such Texas State or Federal court. Each party to this Assignment and Acceptance hereby irrevocably waives, to the fullest extent it may effectively do so, the defense of an inconvenient forum to the maintenance of such action or proceeding.

(f)    THE ASSIGNOR AND THE ASSIGNEE EACH HEREBY KNOWINGLY, VOLUNTARILY, AND INTENTIONALLY WAIVE ANY RIGHTS THEY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH THIS ASSIGNMENT AND ACCEPTANCE, THE CREDIT AGREEMENT, ANY RELATED DOCUMENTS AND AGREEMENTS, OR ANY COURSE OF CONDUCT, COURSE OF DEALING, OR STATEMENTS (WHETHER ORAL OR WRITTEN).

Exhibit F - 4

IN WITNESS WHEREOF, the Assignor and the Assignee have caused this Assignment and Acceptance to be executed and delivered by their duly authorized officers as of the date first above written.

[ASSIGNOR]

By: __________________________________________
Title:
Address:

[ASSIGNEE]

By: __________________________________________
Title:
Address:

Exhibit F - 5

SCHEDULE 1
to
ASSIGNMENT AND ACCEPTANCE

NOTICE OF ASSIGNMENT AND ACCEPTANCE

______________, 20__

Bank of America, N.A, as Agent (as hereinafter defined)

901 Main Street

Dallas, Texas 75202

Attn: Portfolio Manager

Re: Westlake International Holdings II C.V.

Ladies and Gentlemen:

We refer to the Credit Agreement dated as of August 10, 2016 (such agreement, as it may be amended, restated, or otherwise modified from time to time, the “Credit Agreement”) by and among Westlake International Holdings II C.V. (the “Borrower”), acting through Westlake Olefins Corporation, its general partner, the Lenders referred to therein, and Bank of America, N.A., as agent for the Lenders (the “Agent”). Terms defined in the Credit Agreement are used herein as therein defined.

1. We hereby give the Agent notice of, and request the Agent’s consent to, the assignment by __________________ (the “Assignor”) to __________________ (the “Assignee”) of _____% of the right, title, and interest of the Assignor in and to the Credit Agreement (including the right, title, and interest of the Assignor in and to the Revolving Commitment of the Assignor to make Loans, all outstanding Loans made by the Assignor, pursuant to the Assignment and Acceptance Agreement attached hereto (the “Assignment and Acceptance”). We understand and agree that the Assignor’s Revolving Commitment to make Loans, as of ______ __, 20__, is $__________, the aggregate amount of its outstanding Loans is $__________.

2. The Assignee agrees that, upon receiving the consent of the Agent to such assignment, the Assignee will be bound by the terms of the Credit Agreement as fully and to the same extent as if the Assignee were the Lender originally holding such interest in the Credit Agreement.

3. The following administrative details apply to the Assignee:

(A)    Notice Address:

Assignee name: _________________________

Address: _______________________________

Attention: ______________________________

Telephone: (   ) __________________________

Telecopier: (   ) __________________________

Telex (Answerback): ______________________

Exhibit F - 6

(B)    Payment Instructions:

Account No.:

At:

Reference:

Attention:

4. The Agent is entitled to rely upon the representations, warranties, and covenants of each of the Assignor and Assignee contained in the Assignment and Acceptance.

Exhibit F - 7

IN WITNESS WHEREOF, the Assignor and the Assignee have caused this Notice of Assignment and Acceptance to be executed by their respective duly authorized officials, officers, or agents as of the date first above mentioned.

Very truly yours,

[NAME OF ASSIGNOR]

By: __________________________________________
Title:

[NAME OF ASSIGNEE]

By: __________________________________________
Title:

[Consented to and]¹ Accepted:

Bank of America, N.A.,
as Agent

By: __________________________________________
Name:
Title:

[Consented to:]² 

[Westlake International Holdings II C.V.,

acting through Westlake Olefins Corporation, its

general partner ]

By: __________________________________________
Name:
Title:

_______________________________

¹ To be added only if the consent of the Agent is required by the terms of the Credit Agreement.

² To be added only if the consent of the Borrower and/or other parties is required by the terms of the Credit Agreement.

Exhibit F - 8

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Albert Chao, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

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 statements made, 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 financial condition, 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 and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act 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 the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that 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 in accordance 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 effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (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; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant'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 likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	November 9, 2016	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, M. Steven Bender, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

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 statements made, 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 financial condition, 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 and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act 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 the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that 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 in accordance 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 effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (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; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant'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 likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	November 9, 2016	/S/ M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Westlake Chemical Corporation (the "Company") on Form 10-Q for the fiscal quarter ended September 30, 2016 as filed 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, Senior Vice President, Chief Financial Officer and Treasurer of the Company, certify, to the best of our knowledge, pursuant to 18 U.S.C. §1350, as adopted 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 aspects, the financial condition and results of operations of the Company.

Date:	November 9, 2016	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)
Date:	November 9, 2016	/S/    M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 02, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	WLK
Entity Registrant Name	WESTLAKE CHEMICAL CORP
Entity Central Index Key	0001262823
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		128,903,141

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 380,519	$ 662,525
Marketable securities	0	520,144
Accounts receivable, net	1,070,501	508,532
Inventories	744,536	434,060
Prepaid expenses and other current assets	54,868	14,489
Restricted cash	169,320	0
Deferred income taxes	0	35,439
Total current assets	2,419,744	2,175,189
Property, plant and equipment, net	6,450,947	3,004,067
Other assets, net
Goodwill	925,700	62,016
Deferred charges and other assets, net	310,456	176,625
Total other assets, net	2,026,358	390,029
Total assets	10,897,049	5,569,285
Current liabilities
Accounts and notes payable	503,388	235,329
Accrued liabilities	552,581	287,313
Term loan	148,681	0
Total current liabilities	1,204,650	522,642
Long-term debt, net	3,680,585	758,148
Deferred income taxes	1,607,084	575,603
Pension and other post-retirement benefits	434,067	122,821
Other liabilities	146,526	28,140
Total liabilities	7,072,912	2,007,354
Commitments and contingencies (Notes 10 and 20)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and 134,663,244 shares issued at September 30, 2016 and December 31, 2015, respectively	1,347	1,347
Common stock, held in treasury, at cost; 5,752,377 and 4,444,898 shares at September 30, 2016 and December 31, 2015, respectively	(319,980)	(258,312)
Additional paid-in capital	546,519	542,148
Retained earnings	3,337,968	3,109,987
Accumulated other comprehensive loss	(108,126)	(129,292)
Total Westlake Chemical Corporation stockholders' equity	3,457,728	3,265,878
Noncontrolling interests	366,409	296,053
Total equity	3,824,137	3,561,931
Total liabilities and equity	10,897,049	5,569,285
Customer Relationships [Member]
Other assets, net
Finite-lived intangible assets, net	604,551	52,677
Other Intangible Assets, Net [Member]
Other assets, net
Finite-lived intangible assets, net	$ 185,651	$ 98,711

XML

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value, in dollars per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value, in dollars per share	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	134,651,380	134,663,244
Common stock, held in treasury	5,752,377	4,444,898

XML

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,279,028	$ 1,188,037	$ 3,340,276	$ 3,476,570
Cost of sales	1,076,895	876,761	2,641,192	2,527,567
Gross profit	202,133	311,276	699,084	949,003
Selling, general and administrative expenses	72,729	57,248	179,757	170,321
Transaction and integration-related costs	82,841	0	90,550	0
Income from operations	46,563	254,028	428,777	778,682
Other income (expense)
Interest expense	(24,366)	(8,211)	(36,966)	(26,760)
Other income, net	41,265	2,636	52,091	33,790
Income before income taxes	63,462	248,453	443,902	785,712
(Benefit from) provision for income taxes	(6,552)	60,033	129,332	236,824
Net income	70,014	188,420	314,570	548,888
Net income attributable to noncontrolling interests	4,352	4,816	14,656	13,847
Net income attributable to Westlake Chemical Corporation	$ 65,662	$ 183,604	$ 299,914	$ 535,041
Earnings per common share attributable to Westlake Chemical Corporation:
Basic (usd per share)	$ 0.51	$ 1.39	$ 2.31	$ 4.04
Diluted (usd per share)	$ 0.51	$ 1.39	$ 2.29	$ 4.02
Weighted average common shares outstanding:
Basic (in shares)	128,793,661	131,664,296	129,519,577	132,301,814
Diluted (in shares)	129,379,956	132,121,235	130,103,897	132,786,534
Dividends per common share (usd per share)	$ 0.1906	$ 0.1815	$ 0.5536	$ 0.5115

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 70,014	$ 188,420	$ 314,570	$ 548,888
Pension and other post-retirement benefits liability
Pension and other post-retirement reserves adjustment (excluding amortization)	(206)	(22)	(412)	(208)
Amortization of benefits liability	369	692	1,072	2,019
Income tax provision on pension and other post-retirement benefits liability	(60)	(232)	(251)	(621)
Foreign currency translation adjustments	6,453	(1,920)	15,758	(43,746)
Available-for-sale investments
Unrealized holding gains (losses) on investments	1,550	(716)	61,524	3,987
Reclassification of net realized gains to net income	(52,401)	0	(53,720)	(3,795)
Income tax benefit (provision) on available-for-sale investments	18,270	257	(2,805)	(68)
Other comprehensive (loss) income	(26,025)	(1,941)	21,166	(42,432)
Comprehensive income	43,989	186,479	335,736	506,456
Comprehensive income attributable to noncontrolling interests, net of tax of $0 for each of the respective periods presented	4,352	4,816	14,656	13,847
Comprehensive income attributable to Westlake Chemical Corporation	$ 39,637	$ 181,663	$ 321,080	$ 492,609

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 314,570	$ 548,888
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	227,193	180,229
Provision for doubtful accounts	1,176	778
Amortization of debt issuance costs	1,018	1,504
Stock-based compensation expense	6,588	7,544
Loss from disposition of property, plant and equipment	6,541	2,590
Gains realized on previously held shares of Axiall common stock and from sales of securities	(53,720)	(3,795)
Gain on acquisition, net of loss on the fair value remeasurement of preexisting equity interest	0	(21,045)
Impairment of equity method investment	0	4,925
Deferred income taxes	105,910	7,585
Windfall tax benefits from share-based payment arrangements	(1,190)	(2,452)
Income from equity method investments, net of dividends	(61)	(1,016)
Other losses, net	833	3,584
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	(92,311)	54,937
Inventories	(6,124)	105,899
Prepaid expenses and other current assets	1,631	(5,496)
Accounts payable	34,109	(30,511)
Accrued liabilities	73,157	(10,893)
Other, net	(75,160)	(1,955)
Net cash provided by operating activities	544,160	841,300
Cash flows from investing activities
Acquisition of business, net of cash acquired	(2,437,829)	15,782
Additions to cost method investment	(4,000)	0
Additions to property, plant and equipment	(467,330)	(329,236)
Proceeds from disposition of assets	213	17
Proceeds from disposition of equity method investment	0	27,865
Proceeds from sales and maturities of securities	662,938	16,056
Purchase of securities	(138,422)	(282,542)
Settlements of derivative instruments	(4,655)	(1,535)
Net cash used for investing activities	(2,389,085)	(553,593)
Cash flows from financing activities
Debt issuance costs	(35,207)	0
Dividends paid	(71,933)	(67,852)
Distributions to noncontrolling interests	(12,300)	(10,982)
Proceeds from debt issuance	1,428,512	0
Proceeds from exercise of stock options	1,650	984
Proceeds from issuance of notes payable	5,597	19,483
Proceeds from term loan and drawdown of revolver	600,000	0
Restricted cash associated with term loan	(154,000)	0
Repayment of notes payable	(10,602)	(32,954)
Repayment of revolver	(125,000)	0
Repurchase of common stock for treasury	(67,406)	(114,254)
Windfall tax benefits from share-based payment arrangements	1,190	2,452
Net cash provided by (used for) financing activities	1,560,501	(203,123)
Effect of exchange rate changes on cash and cash equivalents	2,418	(3,260)
Net (decrease) increase in cash and cash equivalents	(282,006)	81,324
Cash and cash equivalents at beginning of period	662,525	880,601
Cash and cash equivalents at end of period	$ 380,519	$ 961,925

XML

Basis of Financial Statements

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statements

Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2015 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2015 (the "2015 Form 10-K"), filed with the SEC on February 24, 2016. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2015.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of September 30, 2016, its results of operations for the three and nine months ended September 30, 2016 and 2015 and the changes in its cash position for the nine months ended September 30, 2016 and 2015.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2016 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make 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.

Certain prior period amounts have been reclassified in the consolidated balance sheet and consolidated statements of operations to conform to current presentation.

Recent Accounting Pronouncements

Revenue from Contracts with Customers (ASU No. 2014-09)

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on a comprehensive new revenue recognition standard that will supersede the existing revenue recognition guidance. The new accounting guidance creates a framework by which an entity will allocate the transaction price to separate performance obligations and recognize revenue when each performance obligation is satisfied. Under the new standard, entities will be required to use judgment and make estimates, including identifying performance obligations in a contract, estimating the amount of variable consideration to include in the transaction price, allocating the transaction price to each separate performance obligation and determining when an entity satisfies its performance obligations. The standard allows for either "full retrospective" adoption, meaning that the standard is applied to all of the periods presented with a cumulative catch-up as of the earliest period presented, or "modified retrospective" adoption, meaning the standard is applied only to the most current period presented in the financial statements with a cumulative catch-up as of the current period. In 2016, the FASB issued various additional authoritative guidance for the new revenue recognition standard. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting standard will have on its consolidated financial position, results of operations and cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU No. 2016-01)

In January 2016, the FASB issued an accounting standards update making certain changes principally to the current guidance for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. Among other things, the guidance (1) requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value, with changes in fair value recognized in net income; (2) provide entities with a policy election to record equity investments without readily determinable fair values at cost, less impairment, and subsequent adjustments for observable price changes (changes in the basis of these equity investments to be reported in net income); (3) requires an entity that has elected the fair value option for financial liabilities to recognize changes in fair value due to instrument-specific credit risk separately in other comprehensive income; (4) clarified current guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities; and (5) requires specific disclosure pertaining to financial assets and financial liabilities in the financial statements. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Leases (ASU No. 2016-02)

In February 2016, the FASB issued an accounting standards update on a new lease standard that will supersede the existing lease guidance. The standard requires a lessee to recognize assets and liabilities related to long-term leases that are classified as operating leases under current guidance on its balance sheet. An asset would be recognized related to the right to use the underlying asset and a liability would be recognized related to the obligation to make lease payments over the term of the lease. The standard also requires expanded disclosures related to leases. The accounting standard will be effective for reporting periods beginning after December 15, 2018. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Investments-Equity Method and Joint Ventures (ASU No. 2016-07)

In March 2016, the FASB issued an accounting standards update providing new guidance for the accounting for equity method investments. The new guidance eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. In addition, the guidance requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The accounting standard will be effective for reporting periods beginning after December 15, 2016. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Stock Compensation (ASU No. 2016-09)

In March 2016, the FASB issued an accounting standards update to simplify several aspects of the accounting for share-based payment transactions, including income tax consequences, classifications of awards as either equity or liabilities and certain related classifications on the statement of cash flows. In addition, the new guidance permits entities to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. The accounting standard will be effective for reporting periods beginning after December 15, 2016 and is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Credit Losses (ASU No. 2016-13)

In June 2016, the FASB issued an accounting standards update providing new guidance for the accounting for credit losses on loans and other financial instruments. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. The standard also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The accounting standard will be effective for reporting periods beginning after December 15, 2019. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Cash Flows (ASU No. 2016-16)

In August 2016, the FASB issued an accounting standards update providing new guidance on the classification of certain cash receipts and payments including debt extinguishment costs, debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments, proceeds from the settlement of insurance claims and life insurance policies and distributions received from equity method investees in the statement of cash flows. This update is required to be applied using the retrospective transition method to each period presented unless it is impracticable to be applied retrospectively. In such situation, this guidance is to be applied prospectively. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Recently Adopted Accounting Standards

Amendments to the Consolidation Analysis (ASU No. 2015-02)

In February 2015, the FASB issued an accounting standards update making certain changes to the current consolidation guidance. The amendments affect both the variable interest entity and voting interest entity consolidation models. The new standard changes the consideration of substantive rights, related party interests and fees paid to the decision maker when applying the variable interest entity consolidation model and eliminates certain guidance for limited partnerships and similar entities under the voting interest consolidation model. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Presentation of Debt Issuance Costs (ASU No. 2015-03)

In April 2015, the FASB issued an accounting standards update on simplifying the presentation of debt issuance costs, which requires all costs incurred to issue debt to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016. As a result, Other assets, net—Deferred charges and other assets, net and Long-term debt on the consolidated balance sheet as of December 31, 2015 have been adjusted to $176,625 and $758,148, respectively, from the originally reported $173,384 and $764,115, respectively, to reflect the retrospective application of the new accounting guidance. The adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

Intangibles—Goodwill and Other—Internal use software (ASU No. 2015-05)

In April 2015, the FASB issued an accounting standards update to provide clarification on accounting for cloud computing arrangements which include a software license. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The adoption did not have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Accounting for Measurement-Period Adjustments (ASU No. 2015-16)

In September 2015, the FASB issued an accounting standards update that requires an acquirer to recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The guidance requires that the acquirer record, in the same period's financial statements, the 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 if the accounting had been completed at the acquisition date. The new guidance further requires specific disclosure pertaining to the measurement period adjustments. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Balance Sheet Classification of Deferred Taxes (ASU No. 2015-17)

In November 2015, the FASB issued an accounting standards update that requires all deferred tax assets and liabilities, along with any related valuation allowance, to be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. The new guidance does not change the existing requirement that only permits offsetting within a jurisdiction. The accounting standard is required to be adopted for reporting periods beginning after December 15, 2016; however, early adoption of this standard is permitted. The Company elected to early adopt this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The early adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

XML

Acquisition

9 Months Ended

Sep. 30, 2016

Business Combinations [Abstract]

Acquisition

Acquisition

On August 31, 2016, the Company completed its previously announced acquisition of, and acquired all the remaining equity interest in, Axiall Corporation ("Axiall"), a Delaware corporation. Prior to the acquisition, the Company held 3.1 million shares in Axiall. Pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of June 10, 2016, by and among Westlake, Axiall and Lagoon Merger Sub, Inc., a Delaware corporation that is a wholly-owned subsidiary of Westlake ("Merger Sub"), the Company acquired all of the issued and outstanding shares of common stock of Axiall for $33.00 per share in cash. Pursuant to the Merger Agreement, Merger Sub was merged with and into Axiall (the "Merger"), and Axiall survived the Merger as a wholly-owned subsidiary of the Company. The combined company is the third-largest global chlor-alkali producer and the third-largest global polyvinyl chloride ("PVC") producer. The Company's management believes that this strategic acquisition will enhance its strategy of integration and will further strengthen its role in the North American markets.

Axiall produces a highly integrated chain of chlor-alkali and derivative products, including chlorine, caustic soda, vinyl chloride monomer ("VCM"), vinyl resins, ethylene dichloride (OR 1, 2 dichloroethane), chlorinated solvents, calcium hypochlorite and hydrochloric acid, and compound products. Axiall also manufactures and sells building products, including interior and exterior trim and mouldings products, deck products, siding, pipe and pipe fittings. Substantially all of the vinyl resin used to manufacture Axiall's building products is sourced internally.

Total consideration transferred for the Axiall Merger was $2,526,080. The Merger is being accounted for under the acquisition method of accounting. The assets acquired and liabilities assumed and the results of operations of the acquired business are included in the Company's Vinyls segment.

The acquired business contributed net sales and net loss of $257,407 and ($47,164), respectively, to the Company for the period from August 31, 2016 to September 30, 2016. The net loss for the period from August 31, 2016 to September 30, 2016 included integration-related costs and the negative impact of selling higher cost Axiall inventory recorded at fair value. The following unaudited consolidated pro forma information presents consolidated information as if the Merger had occurred on January 1, 2015:

	Pro Forma Nine Months Ended September 30,
	2016		2015
Net sales	$	5,345,365	$	6,053,330
Net income (1)	$	284,324	$	595,442
Net income (loss) attributable to noncontrolling interest	16,404		(5,953		)
Net income attributable to Westlake Chemical Corporation (1)	$	267,920	$	601,395
Earnings per common share attributable to Westlake Chemical Corporation
Basic	$	2.06	$	4.54
Diluted	$	2.05	$	4.52

_____________

(1) The 2016 pro forma net income amounts include Axiall's historical charges recorded during the eight-month period prior to the closing of the Merger for (1) divestitures; (2) restructuring; and (3) legal and settlement claims, net, of $26,666, $22,881 and $23,376, respectively. These amounts have not been eliminated for pro forma purposes because they do not relate to nonrecurring transaction specific costs related to the Merger.

The pro forma amounts above have been calculated after applying the Company's accounting policies and adjusting the Axiall results to reflect (1) the increase to depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied from January 1, 2015; (2) the elimination of net sales and cost of sales between the Company and Axiall; (3) additional pension service costs; (4) amortization of debt premium and accretion of asset retirement obligations and environmental liabilities as part of the Company's adjustments to fair value; (5) incremental interest expense that would have been incurred assuming the financing arrangements entered by the Company and repayment of a portion of Axiall's outstanding debt had occurred on January 1, 2015; (6) the elimination of transaction-related costs; (7) the elimination of Axiall's goodwill impairment charges for the nine months ended September 30, 2015 and (8) an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory income tax rate of the jurisdictions to which the above adjustments relate. The pro forma amounts do not include any potential synergies, cost savings or other expected benefits of the Merger, are presented for illustrative purposes only and are not necessarily indicative of results that would have been achieved if the Merger had occurred as of January 1, 2015 or of future operating performance.

For the nine months ended September 30, 2016, the Company recognized $90,550 of transaction and integration-related costs. This included acquisition-related costs of $43,895 for advisory, consulting and professional fees and other expenses. Transaction and integration-related costs for the nine months ended September 30, 2016 also included $46,655 related to settlement of Axiall share-based awards, retention agreement costs and severance benefits provided to former Axiall executives in connection with the Merger.

The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition. The preliminary allocation of the consideration transferred is based on management's estimates, judgments and assumptions. When determining the fair values of assets acquired, liabilities assumed and noncontrolling interests of the acquiree, management made significant estimates, judgments and assumptions. These estimates, judgments and assumptions are subject to change upon final valuation and should be treated as preliminary values. Management estimated that consideration paid exceeded the fair value of the net assets acquired. Therefore, goodwill of $863,144 was recorded. The goodwill recognized is primarily attributable to synergies related to the Company's vinyls integration strategy that are expected to arise from the Merger. All of the goodwill is assigned to the Company's Vinyls segment. As a portion of the goodwill arising from the Merger is attributable to foreign operations, there will be a continuing foreign currency impact to goodwill on the financial statements.

Closing stock purchase:
Offer per share	$	33.00
Multiplied by number of shares outstanding at acquisition	67,277
Fair value of Axiall shares outstanding purchased by the Company	$	2,220,141
Axiall debt repaid at acquisition	247,135
Seller's transaction costs paid by the Company (1)	47,458
Fair value of Axiall share-based awards attributed to pre-combination service (2)	11,346
Purchase consideration transferred	$	2,526,080
Fair value of previously held equity interest in Axiall (3)	102,300
Total fair value allocated to net assets acquired	$	2,628,380

_____________

(1) Transactions costs incurred by the seller include legal and advisory costs incurred for the benefit of Axiall's former shareholders and board of directors to evaluate the Company's initial Merger proposals, explore strategic alternatives and negotiate the purchase price.

(2) The fair value of share-based awards attributable to pre-combination service includes the ratio of the pre-combination service performed to the original service period of the Axiall restricted share units and options, including related dividend equivalent rights.

(3) Prior to the Merger, the Company owned 3.1 million shares in Axiall. The investment in Axiall was carried at estimated fair value with unrealized gains recorded as a component of accumulated other comprehensive loss on the consolidated balance sheet. The Company recognized a $49,080 gain for the investment in other income, net in the consolidated statement of operations upon gaining control.

The final allocation of purchase consideration, based on final valuations, could include changes in the estimated fair value of (1) inventories; (2) property, plant and equipment; (3) equity investments; (4) customer relationships, trade names, developed technologies and other intangibles; (5) deferred income taxes; (6) all contingencies; (7) asset retirement obligations; and (8) noncontrolling interests. The assumed contingencies relate to environmental liabilities, legal liabilities, asset retirement obligations and warranty reserves that are provisionally recorded based on estimated fair value.

The information below represents the preliminary purchase price allocation:

Cash	$	88,251
Accounts receivable	422,023
Income tax receivable	48,398
Inventories	302,868
Prepaid expenses and other current assets	48,435
Property, plant and equipment	3,189,582
Customer relationships (weighted average life of 10.7 years)	560,000
Other intangible assets:
Trade name (weighted average life of 6.8 years)	50,000
Technology (weighted average life of 5.4 years)	41,500
Supply contracts and leases (weighted average life of 6.0 years)	26,710
Other assets	105,214
Total assets acquired	4,882,981
Accounts and notes payable	253,967
Interest payable	8,154
Income tax payable	1,921
Accrued compensation	30,057
Accrued liabilities	165,793
Deferred income taxes	973,799
Tax reserve non-current	3,130
Pension and other post retirement obligations	311,106
Other liabilities	114,528
Long-term debt	1,187,290
Total liabilities assumed	3,049,745
Total identifiable net assets acquired	1,833,236
Noncontrolling interest	(68,000		)
Goodwill	863,144
Total purchase consideration	$	2,628,380

XML

Financial Instruments

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Financial Instruments

Financial Instruments

Cash Equivalents

The Company had $1,942 and $221,918 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at September 30, 2016 and December 31, 2015, respectively. The Company's investments in held-to-maturity securities are held at amortized cost, which approximates fair value.

Restricted Cash

The Company had restricted cash and cash equivalents of $195,705 at September 30, 2016, which are primarily related to the balances deposited with and held as security by the lender under the Company's current term loan facility and for distributions to certain of Axiall's current and former employees. The current and non-current restricted cash and cash equivalents of $169,320 and $26,385, respectively, is reflected under current assets and as a component of other assets, net—Deferred charges and other assets, net, respectively, on the consolidated balance sheet. The Company had no restricted cash balances at December 31, 2015.

Available-for-Sale Marketable Securities

The Company had no available-for-sale securities at September 30, 2016. Investments in available-for-sale securities at December 31, 2015 were classified as follows:

	December 31, 2015
Current	$	520,144
Non-current	48,081
Total available-for-sale securities	$	568,225

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company's available-for-sale securities were as follows:

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	336,665	$	55	$	(1,076	)	$	335,644
U.S. government debt (2)	135,226		2		(374		)	134,854
Asset-backed securities	49,759		2		(115		)	49,646
Equity securities	54,371		466		(6,756		)	48,081
Total available-for-sale securities	$	576,021	$	525	$	(8,321	)	$	568,225

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S. government agency mortgage-backed securities.

As of December 31, 2015, net unrealized losses on the Company's available-for-sale securities of $4,995, net of income tax benefit of $2,801, were recorded in accumulated other comprehensive loss.

The proceeds from sales and maturities of available-for-sale securities included in the consolidated statements of cash flows and the gross realized gains and losses included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Proceeds from sales and maturities of securities	$	360,506	$	1,019	$	662,938	$	16,056
Gross realized gains	52,414		—		53,755		3,795
Gross realized losses	13		—		35		—

XML

Accounts Receivable

9 Months Ended

Sep. 30, 2016

Accounts Receivable, Net [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2016			December 31, 2015
Trade customers	$	923,499		$	438,538
Allowance for doubtful accounts	(15,322		)	(14,095		)
	908,177			424,443
Federal and state taxes	134,733			60,748
Other	27,591			23,341
Accounts receivable, net	$	1,070,501		$	508,532

XML

Inventories

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consist of the following:

	September 30, 2016		December 31, 2015
Finished products	$	466,165	$	253,338
Feedstock, additives and chemicals	199,827		106,435
Materials and supplies	78,544		74,287
Inventories	$	744,536	$	434,060

XML

Property, Plant and Equipment

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

As of September 30, 2016, the Company had property, plant and equipment, net totaling $6,450,947. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include, but are not limited to, significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Depreciation expense on property, plant and equipment of $75,143 and $52,208 is primarily included in cost of sales in the consolidated statements of operations for the three months ended September 30, 2016 and 2015, respectively. Depreciation expense on property, plant and equipment of $189,114 and $153,129 is primarily included in cost of sales in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015, respectively.

XML

Other Assets

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Other Assets

Other Assets

Amortization expense on intangible and other assets of $19,175 and $9,419 is included in the consolidated statements of operations for the three months ended September 30, 2016 and 2015, respectively. Amortization expense on intangible and other assets of $38,340 and $28,235 is included in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015, respectively.

Goodwill

The gross carrying amounts of goodwill and the changes in the carrying amount of goodwill for the nine months ended September 30, 2016 were as follows:

	Olefins Segment		Vinyls Segment		Total
Balance at December 31, 2015	$	29,990	$	32,026	$	62,016
Goodwill acquired during the period	—		863,144		863,144
Effects of changes in foreign exchange rates	—		540		540
Balance at September 30, 2016	$	29,990	$	895,710	$	925,700

XML

Accounts and Notes Payable

9 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

Accounts and Notes Payable

Accounts and Notes Payable

Accounts and notes payable consist of the following:

	September 30, 2016		December 31, 2015
Accounts payable	$	502,378	$	229,219
Notes payable to banks	1,010		6,110
Accounts and notes payable	$	503,388	$	235,329

XML

Term Loan

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Term Loan

Term Loan

On August 10, 2016, an indirect subsidiary of the Company, Westlake International Holdings II C.V., a limited partnership organized under the laws of the Netherlands (the "CV Borrower"), entered into a credit agreement with Bank of America, N.A., as agent and lender, providing the CV Borrower with a $150,000 term loan facility. The term loan facility matures on March 31, 2017. The loans thereunder bear interest at a floating interest rate equal to LIBOR plus 2.0% per annum, payable in arrears on the last day of each three-month period following the date of funding and at maturity. The CV Borrower may elect to convert the interest rate to a base rate with a 1.0% spread. The interest rate on the outstanding term loan was 2.82% at September 30, 2016.

The facility contains customary covenants and events of default that impose certain operating and financial restrictions on the CV Borrower and certain of its subsidiaries. These restrictions, among other things, provide limitations on the incurrence of additional indebtedness and liens and the ability to engage in certain transactions with affiliates.

Pursuant to the credit agreement, all of the non-U.S. subsidiaries of the Company are to remain owned, directly or indirectly, by the CV Borrower and its wholly owned subsidiary, Westlake International II LLC, a Delaware limited liability company ("WII LLC"). The CV Borrower is also required, together with its subsidiaries, to maintain at all times unencumbered cash and cash equivalents in a U.S. dollar equivalent of not less than $150,000, which amount shall be increased by 5% to the extent maintained in non-U.S. currencies. In connection therewith, an amount of cash and cash equivalents for the period (a) from the closing date until the date 30 days thereafter, not less than $50,000, and (b) thereafter, not less than $75,000, shall be maintained by the CV Borrower and its subsidiaries in accounts at Bank of America, N.A., in accordance with existing cash management agreements.

Obligations under the term loan facility are secured by a pledge of 65% of the membership interests of WII LLC as well as rights under the partnership agreement of Westlake International Holdings C.V., a limited partnership organized under the laws of the Netherlands, held by WII LLC and the CV Borrower.

XML

Long-Term Debt

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

The Company adopted an accounting standards update to simplify the presentation of debt issuance costs effective January 1, 2016. The standard requires, on a retrospective basis, all costs incurred to issue debt, excluding line-of-credit arrangements, to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability. As a result, Other assets, net—Deferred charges and other assets, net and Long-term debt on the consolidated balance sheet as of December 31, 2015 have been adjusted to $176,625 and $758,148, respectively, from the originally reported $173,384 and $764,115, respectively, to reflect the retrospective application of the new accounting guidance.

Long-term debt consists of the following:

	September 30, 2016							December 31, 2015
	Principal Amount		Unamortized Premium, Discount and Debt Issuance Costs (1)			Net Long-term Debt		Principal Amount		Unamortized Discount and Debt Issuance Costs  (1)			Net Long-term Debt
Revolving credit facility	$	325,000	$	—		$	325,000	$	—	$	—		$	—
4.625% senior notes due 2021 (the    "4.625% Westlake 2021 Senior Notes")	624,793		28,463			653,256		—		—			—
4.625% senior notes due 2021    (the "4.625% Subsidiary 2021 Senior    Notes")	63,207		3,036			66,243		—		—			—
3.60% senior notes due 2022	250,000		(1,976		)	248,024		250,000		(2,232		)	247,768
4.875% senior notes due 2023 (the    "4.875% Westlake 2023 Senior Notes")	433,793		13,958			447,751		—		—			—
4.875% senior notes due 2023    (the "4.875% Subsidiary 2023 Senior    Notes")	16,207		562			16,769		—		—			—
3.60% senior notes due 2026    (the "3.60% 2026 Senior Notes")	750,000		(10,918		)	739,082		—		—			—
Loan related to tax-exempt waste    disposal revenue bonds due 2027	10,889		—			10,889		10,889		—			10,889
6 ½% senior notes due 2029	100,000		(934		)	99,066		100,000		(989		)	99,011
6 ¾% senior notes due 2032	250,000		(1,913		)	248,087		250,000		(2,002		)	247,998
6 ½% senior notes due 2035 (the "6 ½%    2035 GO Zone Senior Notes")	89,000		(851		)	88,149		89,000		(884		)	88,116
6 ½% senior notes due 2035 (the "6 ½%    2035 IKE Zone Senior Notes")	65,000		(610		)	64,390		65,000		(634		)	64,366
5.0% senior notes due 2046 (the "5.0%    2046 Senior Notes")	700,000		(26,121		)	673,879		—		—			—
Long-term debt, net	$	3,677,889	$	2,696		$	3,680,585	$	764,889	$	(6,741	)	$	758,148

_____________

(1) Includes unamortized debt issuance costs of $21,286 and $5,967 at September 30, 2016 and December 31, 2015, respectively.

Credit Agreement

On August 23, 2016, the Company and certain of its subsidiaries entered into an unsecured revolving credit facility (the "Credit Agreement"), by and among the Company, the other borrowers and guarantors referred to therein, the lenders from time to time party thereto (collectively, the "Lenders"), the issuing banks party thereto and JPMorgan Chase Bank, National Association, as Administrative Agent. Under the Credit Agreement, the Lenders have committed to provide an unsecured five-year revolving credit facility in an aggregate principal amount of up to $1,000,000. The Credit Agreement replaced the Company's existing $400,000 senior secured third amended and restated credit facility, dated as of July 17, 2014, by and among the Company, the financial institutions party thereto, as lenders, Bank of America, N.A., as agent, and the Company and certain of its subsidiaries, as borrowers. The Credit Agreement includes a $150,000 sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under the facility. The Credit Agreement also provides for a discretionary $50,000 commitment for swing line loans to be provided on a same-day basis. The Company may also increase the size of the facility, in increments of at least $25,000, up to a maximum of $500,000, subject to certain conditions and if certain Lenders agree to commit to such an increase.

At September 30, 2016, the Company had $325,000 of borrowings outstanding under the Credit Agreement. Borrowings under the Credit Agreement will bear interest, at the Company's option, at either (a) LIBOR plus a spread ranging from 1.0% to 1.75% that will vary depending on the credit rating of the Company or (b) Alternate Base Rate plus a spread ranging from 0.0% to 0.75% that will vary depending on the credit rating of the Company. The Credit Agreement also requires an undrawn commitment fee ranging from 0.10% to 0.25% that will vary depending on the credit rating of the Company. The interest rate on the outstanding revolving credit facility was 2.05% at September 30, 2016. The Credit Agreement matures on August 23, 2021. As of September 30, 2016, the Company had outstanding letters of credit totaling $76,581 and borrowing availability of $598,419 under the Credit Agreement.

The obligations of the Company under the Credit Agreement are guaranteed by current and future material domestic subsidiaries of the Company, subject to customary exceptions. The Credit Agreement contains customary affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant. The Credit Agreement also contains customary events of default and if and for so long as an event of default has occurred and is continuing, any amounts outstanding under the Credit Agreement will accrue interest at an increased rate, the Lenders can terminate their commitments thereunder and payments of any outstanding amounts could be accelerated by the Lenders. As of September 30, 2016, the Company is in compliance with the total leverage ratio financial maintenance covenant.

3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046

On August 10, 2016, the Company completed its private offering of $750,000 aggregate principal amount of 3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes") and $700,000 aggregate principal amount of 5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes"). The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. The Company has entered into a registration rights agreement in which it has agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes. The net proceeds from the offering were used to finance the Merger and to repay amounts under the term loan facility dated February 27, 2015 entered into by Axiall Holdco, Inc. (a wholly-owned subsidiary of Axiall), as the borrower, with the financial institutions party thereto. The indenture governing the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its 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 the Company's or their assets.

Exchange Offers

On September 7, 2016, the Company completed offers to exchange (the "Axiall Exchange Offers") any and all of the $688,000 aggregate principal amount of the outstanding 4.625% senior notes due 2021 (the "4.625% Subsidiary 2021 Senior Notes") issued by Eagle Spinco Inc. ("Eagle Spinco"), a wholly-owned subsidiary of Axiall, and the $450,000 aggregate principal amount of the outstanding 4.875% senior notes due 2023 (the "4.875% Subsidiary 2023 Senior Notes" and, together with the 4.625% Subsidiary 2021 Senior Notes, the "Subsidiary Notes") issued by Axiall for new senior notes issued by the Company having the same maturity and interest rates as the Subsidiary Notes. The 4.625% Subsidiary 2021 Senior Notes and the 4.875% Subsidiary 2023 Senior Notes were assumed at fair value, which resulted in a premium on the Subsidiary Notes of $33,540 and $15,750, respectively. In the Axiall Exchange Offers, $624,793 aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $433,793 aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes were exchanged, respectively, for $624,793 aggregate principal amount of 4.625% senior notes due 2021 (the "4.625% Westlake 2021 Senior Notes") and $433,793 aggregate principal amount of 4.875% senior notes due 2023 (the "4.875% Westlake 2023 Senior Notes") issued by the Company, leaving outstanding $63,207 aggregate principal amount of the 4.625% Subsidiary 2021 Senior Notes and $16,207 aggregate principal amount of the 4.875% Subsidiary 2023 Senior Notes. The Subsidiary Notes are the senior unsecured obligations of Axiall and Eagle Spinco, respectively. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. The Company has entered into a registration rights agreement in which it has agreed to file an exchange offer registration statement or, under specified circumstances, a shelf registration statement, with the SEC with respect to the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes. The indenture governing the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its 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 the Company's or their assets.

Bridge Loan Agreement

In June 2016, in connection with the Axiall acquisition, the Company entered into a commitment letter with various lenders pursuant to which such lenders agreed to provide for a senior unsecured bridge loan facility of up to $1,765,000 in the aggregate. Also in June 2016, the Company paid structuring and other fees of approximately $9,700 in connection with the senior unsecured bridge loan facility. On August 26, 2016, the Company terminated the senior unsecured bridge loan facility and expensed the remaining $8,900 of structuring and other fees paid for the senior unsecured bridge loan facility. This amount is included in other income, net, in the consolidated statements of operations for the three and nine months ended September 30, 2016.

XML

Pension and Post-Retirement Benefits

9 Months Ended

Sep. 30, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Pension and Post-Retirement Benefits

Pension and Post-Retirement Benefits

In connection with the Merger, the Company assumed certain U.S. and non-U.S. pension plans and other post-retirement benefit plans covering Axiall employees. The Axiall pension plans are closed to new participants and provide benefits to certain employees and retirees. The other post-retirement benefit plans are unfunded and provide medical and life insurance benefits for certain employees and their dependents. See Note 2 for the fair value of pension and other post-retirement obligations assumed in the Merger.

Defined Benefit Plans

Components of net periodic benefit cost for the Company's pension plans are as follows:

	Three Months Ended September 30,											Nine Months Ended September 30,
	2016						2015					2016						2015
	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
Service cost	$	315		$	318		$	—		$	416	$	315		$	777		$	29		$	1,248
Expected administrative    expenses	730			—			—			—		730			—			—			—
Interest cost	2,191			622			487			528		1,553			1,763			1,519			1,585
Expected return on plan assets	(3,800		)	(50		)	(712		)	—		(5,260		)	(50		)	(2,237		)	—
Amortization of net loss	338			—			333			263		978			—			942			789
Net periodic benefit (income)    cost	$	(226	)	$	890		$	108		$	1,207	$	(1,684	)	$	2,490		$	253		$	3,622

The Company made no contribution to its U.S. pension plans in the first nine months of 2016. The Company contributed $349 to its U.S. pension plans in the first nine months of 2015. The Company's funding policy for its U.S. plans is consistent with the minimum funding requirements of federal law and regulations, and based on preliminary estimates, the Company does not expect to make contributions to its U.S. pension plans for the remainder of fiscal year ending December 31, 2016. The Company expects to make contributions of approximately $200 for its non-U.S. pension plans during the remainder of the fiscal year ending December 31, 2016.

Other Post-retirement Benefits

Components of net periodic benefit cost for the Company's other post-retirement benefits are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016				2015		2016				2015
	U.S. Plans		Non-U.S. Plans		U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans
Service cost	$	72	$	1	$	6	$	81	$	1	$	17
Interest cost	250		3		149		540		3		448
Amortization of net loss	31		—		96		94		—		288
Net periodic benefit cost	$	353	$	4	$	251	$	715	$	4	$	753

XML

Stockholders Equity

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Stockholders' Equity

Stockholders' Equity

Changes in stockholders' equity for the nine months ended September 30, 2016 and 2015 were as follows:

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2015	$	1,347	$	(258,312	)	$	542,148		$	3,109,987		$	(129,292	)	$	296,053		$	3,561,931
Net income	—		—			—			299,914			—			14,656			314,570
Other comprehensive income,    net of income taxes:
Pension and other post-    retirement benefits    liability	—		—			—			—			409			—			409
Foreign currency    translation adjustments	—		—			—			—			15,758			—			15,758
Net unrealized holding    gains on investments	—		—			—			—			4,999			—			4,999
Common stock repurchased	—		(66,725		)	—			—			—			—			(66,725		)
Shares issued—stock-    based compensation	—		5,057			(3,407		)	—			—			—			1,650
Stock-based compensation,    net of tax on stock options    exercised	—		—			7,778			—			—			—			7,778
Dividends paid	—		—			—			(71,933		)	—			—			(71,933		)
Distributions to noncontrolling    interests	—		—			—			—			—			(12,300		)	(12,300		)
Noncontrolling interest in    acquired business	—		—			—			—			—			68,000			68,000
Balances at September 30, 2016	$	1,347	$	(319,980	)	$	546,519		$	3,337,968		$	(108,126	)	$	366,409		$	3,824,137

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2014	$	1,347	$	(96,372	)	$	530,441		$	2,555,528		$	(79,433	)	$	290,377		$	3,201,888
Net income	—		—			—			535,041			—			13,847			548,888
Other comprehensive income    (loss), net of income taxes
Pension and other post-    retirement benefits    liability	—		—			—			—			1,190			—			1,190
Foreign currency    translation adjustments	—		—			—			—			(43,746		)	—			(43,746		)
Net unrealized holding    gains on investments	—		—			—			—			124			—			124
Common stock repurchased	—		(122,249		)	—			—			—			—			(122,249		)
Shares issued—stock-    based compensation	—		1,079			(95		)	—			—			—			984
Stock-based compensation,    net of tax on stock options    exercised	—		—			9,996			—			—			—			9,996
Dividends paid	—		—			—			(67,852		)	—			—			(67,852		)
Distributions to noncontrolling    interests	—		—			—			—			—			(10,982		)	(10,982		)
Noncontrolling interest in    acquired business	—		—			—			—			—			1,597			1,597
Balances at September 30, 2015	$	1,347	$	(217,542	)	$	540,342		$	3,022,717		$	(121,865	)	$	294,839		$	3,519,838

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2016 and 2015 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains (Losses) on Investments, Net of Tax (1)			Total
Balances at December 31, 2015	$	(8,607	)	$	(115,690	)	$	(4,995	)	$	(129,292	)
Other comprehensive (loss) income before    reclassifications	(252		)	15,758			57,550			73,056
Amounts reclassified from accumulated other    comprehensive loss (income)	661			—			(52,551		)	(51,890		)
Net other comprehensive income for the period	409			15,758			4,999			21,166
Balances at September 30, 2016	$	(8,198	)	$	(99,932	)	$	4		$	(108,126	)

_____________

(1) Includes other comprehensive income from equity method investment.

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains on Investments, Net of Tax			Total
Balances at December 31, 2014	$	(23,442	)	$	(56,224	)	$	233		$	(79,433	)
Other comprehensive (loss) income before    reclassifications	(128		)	(43,746		)	2,556			(41,318		)
Amounts reclassified from accumulated other    comprehensive loss (income)	1,318			—			(2,432		)	(1,114		)
Net other comprehensive income (loss) for the period	1,190			(43,746		)	124			(42,432		)
Balances at September 30, 2015	$	(22,252	)	$	(99,970	)	$	357		$	(121,865	)

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015:

Details about Accumulated    Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016			2015
Amortization of pension and    other post-retirement items
Net loss	(1)	$	(369	)	$	(692	)	$	(1,072	)	$	(2,019	)
	Provision for    income taxes	141			241			411			701
		(228		)	(451		)	(661		)	(1,318		)
Net unrealized gains on    available-for-sale    investments
Realized gain on    available-for-sale    investments	Other income, net	52,401			—			53,720			3,795
	Provision for    income taxes	(696		)	—			(1,169		)	(1,363		)
		51,705			—			52,551			2,432
Total reclassifications for    the period		$	51,477		$	(451	)	$	51,890		$	1,114

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 11 (Employee Benefits) to the financial statements included in the 2015 Form 10-K.

XML

Stock-Based Compensation

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Under the Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated, 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 of common 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 may be 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 performance award). Total stock-based compensation expense related to the 2013 Plan was $1,502 and $2,639 for the three months ended September 30, 2016 and 2015,respectively, and $6,588 and $7,544 for the nine months ended September 30, 2016 and 2015,respectively.

Under the Merger Agreement, all outstanding Axiall restricted stock units were assumed by the Company and converted into restricted stock units in respect of the Company's common stock, with the same terms and conditions except that upon settlement the award holders will receive the greater of (1) the value of $33.00 per Axiall restricted stock unit that was converted into a restricted stock unit in respect of the Company's common stock and (2) the value of the Company's common stock. The awards are classified as liability awards for financial accounting purposes and are re-measured at each reporting date until they vest. The portion of the replacement award that is attributable to pre-combination service by the employee is included in the measure of consideration transferred to acquire Axiall. The remaining fair value of the replacement awards will be recognized as stock-based compensation expense over the remainder of the vesting period. Total stock-based compensation expense recognized related to the Merger Agreement for the three and nine months ended September 30, 2016 was $34,915, of which $32,644 is included in transaction and integration-related costs in the consolidated statements of operations.

XML

Derivative Instruments

9 Months Ended

Sep. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in gross profit in the consolidated statements of operations for the three and nine months ended September 30, 2016 and 2015.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	2,221	$	3,465
Commodity forward contracts	Other assets, net	3,674		2,088
Total derivative assets		$	5,895	$	5,553

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	3,196	$	9,325
Commodity forward contracts	Other liabilities	6,811		12,437
Total derivative liabilities		$	10,007	$	21,762

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized  in Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016		2015
Commodity forward contracts	Gross profit	$	(7,840	)	$	(9,314	)	$	7,784	$	(4,478	)

See Note 15 for the fair value of the Company's derivative instruments.

Disclosure about Offsetting Asset and Liability Derivatives

Certain of the Company's derivative instruments are executed under an International Swaps and Derivatives Association ("ISDA") Master Agreement, which permits the Company and a counterparty to aggregate the amounts owed by each party under multiple transactions and replace them with a single net amount payable by one party to the other. The following tables present the Company's derivative assets and derivative liabilities reported on the consolidated balance sheets and derivative assets and derivative liabilities subject to enforceable master netting arrangements.

	Derivative Assets as of
	September 30, 2016		December 31, 2015
Derivative assets subject to enforceable master netting arrangements	$	—	$	—
Derivative assets not subject to enforceable master netting arrangements	3,560		462
Total derivative assets	$	3,560	$	462

	September 30, 2016							December 31, 2015
Offsetting of Derivative Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	2,335	$	(2,335	)	$	—	$	5,091	$	(5,091	)	$	—

	Derivative Liabilities as of
	September 30, 2016		December 31, 2015
Derivative liabilities subject to enforceable master netting arrangements	$	1,889	$	5,803
Derivative liabilities not subject to enforceable master netting arrangements	5,782		10,868
Total derivative liabilities	$	7,671	$	16,671

	September 30, 2016							December 31, 2015
Offsetting of Derivative Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	4,224	$	(2,335	)	$	1,889	$	10,894	$	(5,091	)	$	5,803

	September 30, 2016						December 31, 2015
Derivative Liabilities by Counterparty	Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount		Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount
Counterparty A	$	1,889	$	—	$	1,889	$	5,564	$	—	$	5,564
Counterparty B	—		—		—		239		—		239
Total	$	1,889	$	—	$	1,889	$	5,803	$	—	$	5,803

XML

Fair Value Measurements

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). 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.

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2016
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	1,551		$	4,344		$	5,895
Risk management liabilities—Commodity forward contracts	(8,091		)	(1,916		)	(10,007		)
	December 31, 2015
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	5,553		$	—		$	5,553
Risk management liabilities—Commodity forward contracts	(11,648		)	(10,114		)	(21,762		)
Marketable securities
Available-for-sale securities	48,081			520,144			568,225

The Level 2 measurements for the Company's commodity contracts are derived using forward curves supplied by industry-recognized and unrelated third-party services. The Level 2 measurements for the Company's available-for-sale securities are derived using market-based pricing provided by unrelated third-party services.

There were no transfers in or out of Levels 1 and 2 of the fair value hierarchy for the nine months ended September 30, 2016 and 2015.

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts and notes payable and current and long-term debt, all of which are recorded at carrying value. The amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net, accounts and notes payable and current term loan approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company's long-term debt are summarized in the table below. The fair value of the Company's long-term debt instruments is determined using a market approach, based upon quotes from financial reporting services. Because the Company's long-term debt instruments may not be actively 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.

	September 30, 2016				December 31, 2015
	Carrying Value		Fair Value		Carrying Value		Fair Value
Revolving credit facility	$	325,000	$	325,000	$	—	$	—
4.625% Westlake 2021 Senior Notes	653,256		653,715		—		—
4.625% Subsidiary 2021 Senior Notes	66,243		66,058		—		—
3.60% senior notes due 2022	248,024		251,480		247,768		244,828
4.875% Westlake 2023 Senior Notes	447,751		454,151		—		—
4.875% Subsidiary 2023 Senior Notes	16,769		16,954		—		—
3.60% 2026 Senior Notes	739,082		752,055		—		—
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889		10,889		10,889
6 ½% senior notes due 2029	99,066		117,726		99,011		117,153
6 ¾% senior notes due 2032	248,087		265,383		247,998		268,490
6 ½% 2035 GO Zone Senior Notes	88,149		105,298		88,116		106,491
6 ½% 2035 IKE Zone Senior Notes	64,390		76,837		64,366		76,741
5.0% 2046 Senior Notes	673,879		705,985		—		—

The carrying values of the Company's long-term debt as of December 31, 2015 have been adjusted to reflect the retrospective application of the accounting standards update on simplifying the presentation of debt issuance costs discussed in Note 10.

XML

Income Taxes

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company elected to early adopt an accounting standards update requiring the noncurrent classification of all deferred tax assets and liabilities, along with any related valuation allowance, effective January 1, 2016. As a result, the Company's deferred tax assets and liabilities have been classified, by jurisdiction, as a net noncurrent deferred tax asset or liability on the consolidated balance sheet. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted.

The effective income tax rate was (10.3)% for the three months ended September 30, 2016. The effective tax rate for the 2016 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 24.2% for the three months ended September 30, 2015. The effective income tax rate for the 2015 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the foreign earnings rate differential, the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed, partially offset by state income taxes.

The effective income tax rate was 29.1% for the nine months ended September 30, 2016. The effective tax rate for the 2016 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, depletion deductions, income attributable to noncontrolling interests, the non-recognition of tax related to the gain recognized on previously held outstanding shares of common stock of Axiall, the benefit in prior years' and current-year tax credits for increased research and development expenditures and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes and nondeductible transaction costs related to the Merger. The effective income tax rate was 30.1% for the nine months ended September 30, 2015. The effective income tax rate for the 2015 period was below the U.S. federal statutory rate of 35.0% primarily due to the benefit of state tax credits, the domestic manufacturing deduction, income attributable to noncontrolling interests, the non-recognition of tax related to the bargain purchase of a controlling interest in Suzhou Huasu Plastics Co., Ltd., the increased benefit in certain prior years' deductions due to a change in the calculation methodology of the domestic manufacturing deduction and adjustments related to prior years' tax returns as filed and the foreign earnings rate differential, partially offset by state income taxes.

There are total gross unrecognized tax benefits of $8,818 for the nine months ended September 30, 2016. The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. The majority of the total unrecognized tax benefits relate to historical balances reported by Axiall prior to the Merger. For the three months ended September 30, 2016, the Company accrued interest and penalties in the amount of $206 related to uncertain tax positions.

Reconciliations of the unrecognized tax benefits for the three months ended September 30, 2016 are set forth in the table below:

Balance as of June 30, 2016	$	—
Amounts attributable to Axiall pre-acquistion	5,471
Additions during the three months ended September 30, 2016	3,444
Reduction during the three months ended September 30, 2016 due to expiration of statute of limitations	(92		)
Foreign currency translation	(5		)
Balance as of September 30, 2016	$	8,818

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2010.

For the nine months ended September 30, 2016, the Company is not permanently reinvested with respect to the outside basis difference for all of its foreign subsidiaries. The Company is asserting under ASC 740-30 that the unremitted earnings of some of its foreign subsidiaries are permanently reinvested outside the U.S. For these foreign subsidiaries, the earnings and profits (E&P) is estimated to be $204,154 at December 31, 2016. If no assertion were made to permanently reinvest any of these unremitted foreign earnings, U.S. income tax expense of approximately $32,272 relating to U.S. tax would be recorded. Such expense takes into account utilization of foreign tax credits. The Company is not asserting under ASC 740-30 for certain other foreign subsidiaries. As such, the Company recorded a deferred tax liability (and related tax expense) of $1,837. Of this amount, $1,169 has been recorded to recognize the foreign taxes that would result if earnings in lower-tier foreign subsidiaries would be distributed up the foreign ownership chain to a subsidiary where an assertion is made. In addition, $668 has been recorded to recognize the U.S. tax impact of the unremitted foreign earnings of the Company's Taiwanese subsidiary based on four months of activity from acquisition date to the year ended December 31, 2016. The Taiwanese subsidiary is expected to make annual distributions to the Company.

XML

Earnings per Share

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The Company has unvested shares of restricted stock and restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Less:
Net income attributable to participating securities	(294		)	(195		)	(1,347		)	(653		)
Net income attributable to common shareholders	$	65,368		$	183,409		$	298,567		$	534,388

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Weighted average common shares—basic	128,793,661		131,664,296		129,519,577		132,301,814
Plus incremental shares from:
Assumed exercise of options	586,295		456,939		584,320		484,720
Weighted average common shares—diluted	129,379,956		132,121,235		130,103,897		132,786,534
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	0.51	$	1.39	$	2.31	$	4.04
Diluted	$	0.51	$	1.39	$	2.29	$	4.02

Excluded from the computation of diluted earnings per share are options to purchase 620,010 and 315,285 shares of common stock for the three months ended September 30, 2016 and 2015, respectively, and 577,254 and 295,825 shares of common stock for the nine months ended September 30, 2016 and 2015, respectively. These options were outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive.

XML

Supplemental Information

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Information

Supplemental Information

Accrued Liabilities

Accrued liabilities were $552,581 and $287,313 at September 30, 2016 and December 31, 2015, respectively. Accrued rebates, which is a component of accrued liabilities, was $73,798 and $46,460 at September 30, 2016 and December 31, 2015, respectively. No other component of accrued liabilities was more than five percent of total current liabilities.

Other Income, Net

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Interest income	$	537		$	1,631		$	6,899		$	3,383
Dividend income	868			—			5,142			3,328
Acquisition-related financing costs	(11,420		)	—			(12,220		)	—
Foreign exchange currency (losses) gains, net	(1,281		)	(731		)	(2,435		)	1,140
Impairment of equity method investment	—			—			—			(4,925		)
Gain realized on previously held shares of Axiall    common stock	49,080			—			49,080			—
Gain on acquisition and related expenses, net	—			—			—			20,430
Gains from sales of securities, net	3,321			—			4,640			3,795
Other	160			1,736			985			6,639
Other income, net	$	41,265		$	2,636		$	52,091		$	33,790

XML

Insurance Recovery

9 Months Ended

Sep. 30, 2016

Insurance Recovery [Abstract]

Insurance Recovery

Insurance Recovery

During the second and third quarters of 2015, the Company's production rates and operating costs at its Knapsack, Germany and Cologne, Germany facilities were negatively impacted due to an interruption of feedstock supply as a result of a fire at a third-party supplier's ethylene production facility. During the nine months ended September 30, 2016, the Company received a final insurance recovery of approximately $2,670 related to business interruption costs. The insurance recovery is included in cost of sales in the consolidated statement of operations. The Company had received and recognized approximately $7,809 as a partial insurance recovery during the year ended December 31, 2015.

XML

Commitments and Contingencies

9 Months Ended

Sep. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company is involved in a number of legal and regulatory matters, principally environmental in nature, that are incidental to the normal conduct of its business, including lawsuits, investigations and claims. The outcome of these matters are inherently unpredictable. The Company believes that, in the aggregate, the outcome of all known legal and regulatory matters will not have a material adverse effect on its consolidated financial statements; however, specific outcomes with respect to such matters may be material to the Company's consolidated statements of operations in any particular period in which costs, if any, are recognized. The Company's assessment of the potential impact of environmental matters, in particular, is subject to uncertainty due to the complex, ongoing and evolving process of investigation and remediation of such environmental matters, and the potential for technological and regulatory developments. In addition, the impact of evolving claims and programs, such as natural resource damage claims, industrial site reuse initiatives and state remediation programs creates further uncertainty of the ultimate resolution of these matters. The Company anticipates that the resolution of many legal and regulatory matters, and in particular environmental matters, will occur over an extended period of time.

Environmental. As of September 30, 2016 and December 31, 2015, the Company had reserves for environmental contingencies totaling approximately $60,693 (primarily as a result of the Axiall acquisition) and $1,095, respectively, most of which was classified as noncurrent liabilities. The Company's assessment of the potential impact of these environmental contingencies is subject to considerable 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.

From time to time the Company receives 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 requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and the proceedings involve potential monetary sanctions, unless the Company reasonably believes such sanctions would not exceed $100.

• In May 2013, an amendment to an existing consent order agreed to by the West Virginia Department of Environmental Protection and a predecessor of Axiall required that it, among other things, pay a penalty in the amount of $449 and continue certain corrective action associated with discharges of hexachlorocyclohexane (commonly referred to as BHC) from the Natrium, West Virginia facility's effluent discharge outfalls. The penalty was paid and corrective actions required under the amendment to the consent order are on-going.

• In May 2013 and September 2013, the Environmental Protection Agency (the "EPA") conducted inspections at the Company's Plaquemine, Louisiana facility pursuant to requirements of the federal Clean Air Act Section 112(r) Risk Management Program and Title V. As a result of the inspections, the EPA identified areas of concern and the Company has subsequently engaged in negotiations, which are anticipated to result in sanctions of $167.

• The LDEQ has issued notices of violations ("NOVs") regarding the Company's olefins facilities in Lake Charles, Louisiana for various air and water compliance issues. The Company is working with the LDEQ to settle these claims, and a global settlement of all claims is being discussed. The Company has reached a verbal agreement with the LDEQ to settle certain of the NOVs in two separate settlements for a combined $192 in civil penalties.

• During September 2010, the Company's vinyls facilities in north Lake Charles and Plaquemine each received a Consolidated Compliance Order and Notice of Potential Penalty, alleging violations of various requirements of those facilities' air permits, based largely on self-reported permit deviations related to record-keeping violations. The Company has been negotiating a possible global settlement of these and several other matters with the LDEQ. The Company believes the resolution of these matters may require the payment of a monetary sanction in excess of $100.

• In April 2015, Axiall received a communication from the EPA related to, among other things, the EPA's investigation of the 2012 and 2013 fires that occurred at its VCM plant in Lake Charles. In late 2015, Axiall settled this matter with the EPA, with such settlement including on-going supplemental environmental projects and a payment of $900.

• For several years, the EPA has been conducting an enforcement initiative against petroleum refineries and petrochemical plants with respect to emissions from flares. On April 21, 2014, the Company received a Clean Air Act Section 114 Information Request from the EPA which sought information regarding flares at the Calvert City, Kentucky and certain Lake Charles facilities. The EPA has informed the Company that the information provided leads the EPA to 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 would obligate the Company to take corrective actions relating to the alleged noncompliance. The Company believes the resolution of these matters may require the payment of a monetary sanction in excess of $100.

The Company does not believe that resolutions of any or all of these matters will have a material adverse effect on the Company's financial condition, results of operations or cash flows.

XML

Segment Information

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates in two principal operating segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Net external sales
Olefins
Polyethylene	$	380,810	$	423,631	$	1,098,500	$	1,283,545
Styrene, feedstock and other	116,555		164,466		324,369		508,507
Total Olefins	497,365		588,097		1,422,869		1,792,052
Vinyls
PVC, caustic soda and other	599,276		468,235		1,492,650		1,315,101
Building products	182,387		131,705		424,757		369,417
Total Vinyls	781,663		599,940		1,917,407		1,684,518
	$	1,279,028	$	1,188,037	$	3,340,276	$	3,476,570

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Intersegment sales
Olefins	$	30,614		$	28,551		$	85,856		$	78,654
Vinyls	2,130			341			2,719			1,098
	$	32,744		$	28,892		$	88,575		$	79,752
Income (loss) from operations
Olefins	$	118,475		$	196,703		$	408,274		$	608,744
Vinyls	22,235			67,779			136,559			202,831
Corporate and other	(94,147		)	(10,454		)	(116,056		)	(32,893		)
	$	46,563		$	254,028		$	428,777		$	778,682
Depreciation and amortization
Olefins	$	36,649		$	27,678		$	95,582		$	82,240
Vinyls	56,136			33,432			128,691			97,615
Corporate and other	1,444			138			2,920			374
	$	94,229		$	61,248		$	227,193		$	180,229
Other income (expense), net
Olefins	$	1,101		$	1,323		$	3,706		$	3,770
Vinyls	(1,226		)	10			1,722			6,927
Corporate and other	41,390			1,303			46,663			23,093
	$	41,265		$	2,636		$	52,091		$	33,790
Provision for (benefit from) income taxes
Olefins	$	31,956		$	45,865		$	136,429		$	186,534
Vinyls	(3,912		)	15,812			29,655			55,270
Corporate and other	(34,596		)	(1,644		)	(36,752		)	(4,980		)
	$	(6,552	)	$	60,033		$	129,332		$	236,824
Capital expenditures
Olefins	$	96,469		$	69,885		$	285,359		$	206,719
Vinyls	83,523			53,510			180,392			114,935
Corporate and other	178			1,909			1,579			7,582
	$	180,170		$	125,304		$	467,330		$	329,236

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Income from operations	$	46,563		$	254,028		$	428,777		$	778,682
Interest expense	(24,366		)	(8,211		)	(36,966		)	(26,760		)
Other income, net	41,265			2,636			52,091			33,790
Income before income taxes	$	63,462		$	248,453		$	443,902		$	785,712

	September 30, 2016		December 31, 2015
Total assets
Olefins	$	2,094,163	$	1,869,888
Vinyls	8,262,971		2,638,833
Corporate and other	539,915		1,060,564
	$	10,897,049	$	5,569,285

XML

Subsequent Events

9 Months Ended

Sep. 30, 2016

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

XML

Guarantor Disclosures

9 Months Ended

Sep. 30, 2016

Guarantees [Abstract]

Guarantor Disclosures

Guarantor Disclosures

The Company's payment obligations under the 3.60% senior notes due 2022 are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 3.60% senior notes due 2022 in excess of $5,000 (the "Guarantor Subsidiaries"). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation (the "100% Owned Guarantor Subsidiaries"). These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the 100% owned Guarantor Subsidiaries, and the remaining subsidiaries that do not guarantee the 3.60% senior notes due 2022 (the "Non-Guarantor Subsidiaries"), together with consolidating eliminations necessary to present the Company's results on a consolidated basis.

In August 2016, certain of the Company's subsidiary guarantors were released from their guarantees of the Company's 3.60% senior notes due 2022 in connection with the replacement of the Company's revolving credit facility. Westlake Chemical OpCo LP, which was previously separately presented as a less than 100% owned guarantor, and certain of the Company's other 100% owned subsidiaries that were previously presented as guarantors, are now reflected as Non-Guarantor Subsidiaries in the condensed consolidating guarantor financial information. Prior periods were retrospectively adjusted to conform to the current presentation of Guarantor Subsidiaries and Non-Guarantor Subsidiaries.

Condensed Consolidating Financial Information as of September 30, 2016

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	144,899	$	1,884	$	233,736	$	—		$	380,519
Accounts receivable, net	1,457		2,838,917		765,949		(2,535,822		)	1,070,501
Inventories	—		329,233		415,303		—			744,536
Prepaid expenses and other current assets	8,257		16,264		43,741		(13,394		)	54,868
Restricted cash	—		—		169,320		—			169,320
Total current assets	154,613		3,186,298		1,628,049		(2,549,216		)	2,419,744
Property, plant and equipment, net	—		1,538,148		4,912,799		—			6,450,947
Other assets, net	9,074,810		418,588		1,695,970		(9,163,010		)	2,026,358
Total assets	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049
Current liabilities
Accounts and notes payable	$	2,172,989	$	466,907	$	387,807	$	(2,524,315	)	$	503,388
Accrued liabilities	12,022		162,645		402,815		(24,901		)	552,581
Term loan	—		—		148,681		—			148,681
Total current liabilities	2,185,011		629,552		939,303		(2,549,216		)	1,204,650
Long-term debt, net	3,586,684		775,995		2,199,812		(2,881,906		)	3,680,585
Deferred income taxes	—		596,928		1,022,226		(12,070		)	1,607,084
Pension and other liabilities	—		48,837		531,756		—			580,593
Total liabilities	5,771,695		2,051,312		4,693,097		(5,443,192		)	7,072,912
Total Westlake Chemical Corporation stockholders' equity	3,457,728		3,091,722		3,177,312		(6,269,034		)	3,457,728
Noncontrolling interests	—		—		366,409		—			366,409
Total equity	3,457,728		3,091,722		3,543,721		(6,269,034		)	3,824,137
Total liabilities and equity	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049

Condensed Consolidating Financial Information as of December 31, 2015

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	303,131	$	6,818	$	352,576	$	—		$	662,525
Marketable securities	520,144		—		—		—			520,144
Accounts receivable, net	10,943		2,474,963		190,384		(2,167,758		)	508,532
Inventories	—		287,114		146,946		—			434,060
Prepaid expenses and other current assets	2,201		10,186		4,981		(2,879		)	14,489
Deferred income taxes	702		28,325		6,412		—			35,439
Total current assets	837,121		2,807,406		701,299		(2,170,637		)	2,175,189
Property, plant and equipment, net	—		1,476,642		1,527,425		—			3,004,067
Other assets, net	5,003,096		914,823		1,442,436		(6,970,326		)	390,029
Total assets	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285
Current liabilities
Accounts payable	$	1,817,963	$	374,468	$	185,931	$	(2,143,033	)	$	235,329
Accrued liabilities	9,117		163,167		142,633		(27,604		)	287,313
Total current liabilities	1,827,080		537,635		328,564		(2,170,637		)	522,642
Long-term debt, net	747,259		744,405		—		(733,516		)	758,148
Deferred income taxes	—		513,692		68,478		(6,567		)	575,603
Pension and other liabilities	—		49,202		101,759		—			150,961
Total liabilities	2,574,339		1,844,934		498,801		(2,910,720		)	2,007,354
Total Westlake Chemical Corporation stockholders' equity	3,265,878		3,353,937		2,876,306		(6,230,243		)	3,265,878
Noncontrolling interests	—		—		296,053		—			296,053
Total equity	3,265,878		3,353,937		3,172,359		(6,230,243		)	3,561,931
Total liabilities and equity	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	775,474		$	823,238		$	(319,684	)	$	1,279,028
Cost of sales	—			677,085			714,365			(314,555		)	1,076,895
Gross profit	—			98,389			108,873			(5,129		)	202,133
Selling, general and administrative expenses	2,092			31,180			44,586			(5,129		)	72,729
Transaction and integration-related costs	—			35,379			47,462			—			82,841
(Loss) income from operations	(2,092		)	31,830			16,825			—			46,563
Interest expense	(22,130		)	(10,247		)	(9,117		)	17,128			(24,366		)
Other income (expense), net	35,405			(8,622		)	31,610			(17,128		)	41,265
Income before income taxes	11,183			12,961			39,318			—			63,462
(Benefit from) provision for income taxes	(2,088		)	18,987			(23,451		)	—			(6,552		)
Equity in net income of subsidiaries	52,391			—			—			(52,391		)	—
Net income (loss)	65,662			(6,026		)	62,769			(52,391		)	70,014
Net income attributable to noncontrolling interests	—			—			4,352			—			4,352
Net income (loss) attributable to Westlake Chemical Corporation	$	65,662		$	(6,026	)	$	58,417		$	(52,391	)	$	65,662
Comprehensive income (loss) attributable to Westlake Chemical Corporation	$	39,637		$	(5,923	)	$	45,945		$	(40,022	)	$	39,637

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	901,006		$	596,860	$	(309,829	)	$	1,188,037
Cost of sales	—			712,681			469,137		(305,057		)	876,761
Gross profit	—			188,325			127,723		(4,772		)	311,276
Selling, general and administrative expenses	804			37,156			24,060		(4,772		)	57,248
(Loss) income from operations	(804		)	151,169			103,663		—			254,028
Interest expense	(10,405		)	(5,711		)	—		7,905			(8,211		)
Other income, net	1,239			203			9,099		(7,905		)	2,636
(Loss) income before income taxes	(9,970		)	145,661			112,762		—			248,453
(Benefit from) provision for income taxes	(3,249		)	53,131			10,151		—			60,033
Equity in net income of subsidiaries	190,325			—			—		(190,325		)	—
Net income	183,604			92,530			102,611		(190,325		)	188,420
Net income attributable to noncontrolling interests	—			—			4,816		—			4,816
Net income attributable to Westlake Chemical Corporation	$	183,604		$	92,530		$	97,795	$	(190,325	)	$	183,604
Comprehensive income attributable to Westlake Chemical Corporation	$	181,663		$	92,781		$	96,062	$	(188,843	)	$	181,663

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,357,769		$	1,945,866		$	(963,359	)	$	3,340,276
Cost of sales	—			2,018,282			1,570,669			(947,759		)	2,641,192
Gross profit	—			339,487			375,197			(15,600		)	699,084
Selling, general and administrative expenses	3,648			104,488			87,221			(15,600		)	179,757
Transaction and integration-related costs	—			43,088			47,462			—			90,550
(Loss) income from operations	(3,648		)	191,911			240,514			—			428,777
Interest expense	(43,228		)	(19,051		)	(9,117		)	34,430			(36,966		)
Other income (expense), net	40,807			(12,057		)	57,771			(34,430		)	52,091
(Loss) income before income taxes	(6,069		)	160,803			289,168			—			443,902
(Benefit from) provision for income taxes	(8,268		)	136,856			744			—			129,332
Equity in net income of subsidiaries	297,715			—			—			(297,715		)	—
Net income	299,914			23,947			288,424			(297,715		)	314,570
Net income attributable to noncontrolling interests	—			—			14,656			—			14,656
Net income attributable to Westlake Chemical Corporation	$	299,914		$	23,947		$	273,768		$	(297,715	)	$	299,914
Comprehensive income attributable to Westlake Chemical Corporation	$	321,080		$	24,356		$	293,859		$	(318,215	)	$	321,080

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,677,773		$	1,727,561	$	(928,764	)	$	3,476,570
Cost of sales	—			2,078,730			1,362,710		(913,873		)	2,527,567
Gross profit	—			599,043			364,851		(14,891		)	949,003
Selling, general and administrative expenses	1,617			115,400			68,195		(14,891		)	170,321
(Loss) income from operations	(1,617		)	483,643			296,656		—			778,682
Interest expense	(31,726		)	(18,353		)	—		23,319			(26,760		)
Other income (expense), net	17,627			(4,743		)	44,225		(23,319		)	33,790
(Loss) income before income taxes	(15,716		)	460,547			340,881		—			785,712
(Benefit from) provision for income taxes	(5,226		)	222,743			19,307		—			236,824
Equity in net income of subsidiaries	545,531			—			—		(545,531		)	—
Net income	535,041			237,804			321,574		(545,531		)	548,888
Net income attributable to noncontrolling interests	—			—			13,847		—			13,847
Net income attributable to Westlake Chemical Corporation	$	535,041		$	237,804		$	307,727	$	(545,531	)	$	535,041
Comprehensive income attributable to Westlake Chemical Corporation	$	492,609		$	238,433		$	264,542	$	(502,975	)	$	492,609

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	299,914		$	23,947		$	288,424		$	(297,715	)	$	314,570
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	747			98,658			128,806			—			228,211
Deferred income taxes	(5,178		)	111,795			(707		)	—			105,910
Net changes in working capital and other	(314,423		)	93,280			(181,103		)	297,715			(104,531		)
Net cash (used for) provided by operating activities	(18,940		)	327,680			235,420			—			544,160
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			(2,437,829		)	—			(2,437,829		)
Additions to cost method investment	—			—			(4,000		)	—			(4,000		)
Additions to property, plant and equipment	—			(163,579		)	(303,751		)	—			(467,330		)
Proceeds from disposition of assets	—			48			165			—			213
Proceeds from sales and maturities of securities	658,338			—			4,600			—			662,938
Purchase of securities	(138,422		)	—			—			—			(138,422		)
Settlements of derivative instruments	—			(4,655		)	—			—			(4,655		)
Net cash provided by (used for) investing activities	519,916			(168,186		)	(2,740,815		)	—			(2,389,085		)
Cash flows from financing activities
Intercompany financing	(2,242,604		)	(366,639		)	2,609,243			—			—
Capitalized debt issuance costs	(33,617		)	—			(1,590		)	—			(35,207		)
Dividends paid	(71,933		)	—			—			—			(71,933		)
Distributions paid	—			202,211			(214,511		)	—			(12,300		)
Proceeds from debt issuance	1,428,512			—			—			—			1,428,512
Proceeds from exercise of stock options	1,650			—			—			—			1,650
Proceeds from issuance of notes payable	—			—			5,597			—			5,597
Proceeds from term loan and drawdown of revolver	450,000			—			150,000			—			600,000
Restricted cash associated with term loan	—			—			(154,000		)	—			(154,000		)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations		Consolidated
Repayment of notes payable	—			—			(10,602		)	—		(10,602		)
Repayment of revolver	(125,000		)	—			—			—		(125,000		)
Repurchase of common stock for treasury	(67,406		)	—			—			—		(67,406		)
Windfall tax benefits from share-based payment arrangements	1,190			—			—			—		1,190
Net cash (used for) provided by financing activities	(659,208		)	(164,428		)	2,384,137			—		1,560,501
Effect of exchange rate changes on cash and cash equivalents	—			—			2,418			—		2,418
Net decrease in cash and cash equivalents	(158,232		)	(4,934		)	(118,840		)	—		(282,006		)
Cash and cash equivalents at beginning of period	303,131			6,818			352,576			—		662,525
Cash and cash equivalents at end of period	$	144,899		$	1,884		$	233,736		$	—	$	380,519

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	535,041		$	237,804		$	321,574		$	(545,531	)	$	548,888
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	1,504			81,770			98,459			—			181,733
Deferred income taxes	87			3,972			3,526			—			7,585
Net changes in working capital and other	(567,137		)	110,574			14,126			545,531			103,094
Net cash (used for) provided by operating activities	(30,505		)	434,120			437,685			—			841,300
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(137,844		)	(191,392		)	—			(329,236		)
Proceeds from disposition of assets	—			—			17			—			17
Proceeds from disposition of equity method investment	—			27,865			—			—			27,865
Proceeds from sales and maturities of securities	16,056			—			—			—			16,056
Purchase of securities	(282,542		)	—			—			—			(282,542		)
Settlements of derivative instruments	—			(1,535		)	—			—			(1,535		)
Net cash used for investing activities	(266,486		)	(111,514		)	(175,593		)	—			(553,593		)
Cash flows from financing activities
Intercompany financing	467,360			(570,217		)	102,857			—			—
Dividends paid	(67,852		)	—			—			—			(67,852		)
Distributions paid	—			249,999			(260,981		)	—			(10,982		)
Proceeds from exercise of stock options	984			—			—			—			984
Proceeds from issuance of notes payable	—			—			19,483			—			19,483
Repayment of notes payable	—			—			(32,954		)	—			(32,954		)
Repurchase of common stock for treasury	(114,254		)	—			—			—			(114,254		)
Windfall tax benefits from share-based payment arrangements	2,452			—			—			—			2,452
Net cash provided by (used for) financing activities	288,690			(320,218		)	(171,595		)	—			(203,123		)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations		Consolidated
Effect of exchange rate changes on cash and cash equivalents	—			—		(3,260		)	—		(3,260		)
Net (decrease) increase in cash and cash equivalents	(8,301		)	2,388		87,237			—		81,324
Cash and cash equivalents at beginning of period	655,947			3,047		221,607			—		880,601
Cash and cash equivalents at end of period	$	647,646		$	5,435	$	308,844		$	—	$	961,925

XML

Basis of Financial Statements (Policies)

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statements

Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2015 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2015 (the "2015 Form 10-K"), filed with the SEC on February 24, 2016. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2015.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of September 30, 2016, its results of operations for the three and nine months ended September 30, 2016 and 2015 and the changes in its cash position for the nine months ended September 30, 2016 and 2015.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2016 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make 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.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Revenue from Contracts with Customers (ASU No. 2014-09)

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on a comprehensive new revenue recognition standard that will supersede the existing revenue recognition guidance. The new accounting guidance creates a framework by which an entity will allocate the transaction price to separate performance obligations and recognize revenue when each performance obligation is satisfied. Under the new standard, entities will be required to use judgment and make estimates, including identifying performance obligations in a contract, estimating the amount of variable consideration to include in the transaction price, allocating the transaction price to each separate performance obligation and determining when an entity satisfies its performance obligations. The standard allows for either "full retrospective" adoption, meaning that the standard is applied to all of the periods presented with a cumulative catch-up as of the earliest period presented, or "modified retrospective" adoption, meaning the standard is applied only to the most current period presented in the financial statements with a cumulative catch-up as of the current period. In 2016, the FASB issued various additional authoritative guidance for the new revenue recognition standard. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting standard will have on its consolidated financial position, results of operations and cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU No. 2016-01)

In January 2016, the FASB issued an accounting standards update making certain changes principally to the current guidance for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. Among other things, the guidance (1) requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value, with changes in fair value recognized in net income; (2) provide entities with a policy election to record equity investments without readily determinable fair values at cost, less impairment, and subsequent adjustments for observable price changes (changes in the basis of these equity investments to be reported in net income); (3) requires an entity that has elected the fair value option for financial liabilities to recognize changes in fair value due to instrument-specific credit risk separately in other comprehensive income; (4) clarified current guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities; and (5) requires specific disclosure pertaining to financial assets and financial liabilities in the financial statements. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Leases (ASU No. 2016-02)

In February 2016, the FASB issued an accounting standards update on a new lease standard that will supersede the existing lease guidance. The standard requires a lessee to recognize assets and liabilities related to long-term leases that are classified as operating leases under current guidance on its balance sheet. An asset would be recognized related to the right to use the underlying asset and a liability would be recognized related to the obligation to make lease payments over the term of the lease. The standard also requires expanded disclosures related to leases. The accounting standard will be effective for reporting periods beginning after December 15, 2018. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Investments-Equity Method and Joint Ventures (ASU No. 2016-07)

In March 2016, the FASB issued an accounting standards update providing new guidance for the accounting for equity method investments. The new guidance eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. In addition, the guidance requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The accounting standard will be effective for reporting periods beginning after December 15, 2016. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Stock Compensation (ASU No. 2016-09)

In March 2016, the FASB issued an accounting standards update to simplify several aspects of the accounting for share-based payment transactions, including income tax consequences, classifications of awards as either equity or liabilities and certain related classifications on the statement of cash flows. In addition, the new guidance permits entities to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. The accounting standard will be effective for reporting periods beginning after December 15, 2016 and is not expected to have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Credit Losses (ASU No. 2016-13)

In June 2016, the FASB issued an accounting standards update providing new guidance for the accounting for credit losses on loans and other financial instruments. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. The standard also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The accounting standard will be effective for reporting periods beginning after December 15, 2019. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Cash Flows (ASU No. 2016-16)

In August 2016, the FASB issued an accounting standards update providing new guidance on the classification of certain cash receipts and payments including debt extinguishment costs, debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments, proceeds from the settlement of insurance claims and life insurance policies and distributions received from equity method investees in the statement of cash flows. This update is required to be applied using the retrospective transition method to each period presented unless it is impracticable to be applied retrospectively. In such situation, this guidance is to be applied prospectively. The accounting standard will be effective for reporting periods beginning after December 15, 2017. The Company is in the process of evaluating the impact that the new accounting guidance will have on its consolidated financial position, results of operations and cash flows.

Recently Adopted Accounting Standards

Amendments to the Consolidation Analysis (ASU No. 2015-02)

In February 2015, the FASB issued an accounting standards update making certain changes to the current consolidation guidance. The amendments affect both the variable interest entity and voting interest entity consolidation models. The new standard changes the consideration of substantive rights, related party interests and fees paid to the decision maker when applying the variable interest entity consolidation model and eliminates certain guidance for limited partnerships and similar entities under the voting interest consolidation model. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Presentation of Debt Issuance Costs (ASU No. 2015-03)

In April 2015, the FASB issued an accounting standards update on simplifying the presentation of debt issuance costs, which requires all costs incurred to issue debt to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of a debt discount. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016. As a result, Other assets, net—Deferred charges and other assets, net and Long-term debt on the consolidated balance sheet as of December 31, 2015 have been adjusted to $176,625 and $758,148, respectively, from the originally reported $173,384 and $764,115, respectively, to reflect the retrospective application of the new accounting guidance. The adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

Intangibles—Goodwill and Other—Internal use software (ASU No. 2015-05)

In April 2015, the FASB issued an accounting standards update to provide clarification on accounting for cloud computing arrangements which include a software license. The accounting standard is effective for annual periods beginning after December 15, 2015. The Company adopted this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The adoption did not have a material impact on the Company's consolidated financial position, results of operations and cash flows.

Simplifying the Accounting for Measurement-Period Adjustments (ASU No. 2015-16)

In September 2015, the FASB issued an accounting standards update that requires an acquirer to recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The guidance requires that the acquirer record, in the same period's financial statements, the 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 if the accounting had been completed at the acquisition date. The new guidance further requires specific disclosure pertaining to the measurement period adjustments. The accounting standard is effective for reporting periods beginning after December 15, 2015. The Company adopted this accounting standard effective January 1, 2016 and the adoption did not have an impact on the Company's consolidated financial position, results of operations and cash flows.

Balance Sheet Classification of Deferred Taxes (ASU No. 2015-17)

In November 2015, the FASB issued an accounting standards update that requires all deferred tax assets and liabilities, along with any related valuation allowance, to be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. The new guidance does not change the existing requirement that only permits offsetting within a jurisdiction. The accounting standard is required to be adopted for reporting periods beginning after December 15, 2016; however, early adoption of this standard is permitted. The Company elected to early adopt this accounting standard, to be applied prospectively, effective January 1, 2016. Consistent with the prospective application of this accounting standard, prior period comparative information was not adjusted. The early adoption of this accounting standard did not have an impact on the Company's results of operations and cash flows.

XML

Acquisition (Tables)

9 Months Ended

Sep. 30, 2016

Business Combinations [Abstract]

Pro Forma Information

The net loss for the period from August 31, 2016 to September 30, 2016 included integration-related costs and the negative impact of selling higher cost Axiall inventory recorded at fair value. The following unaudited consolidated pro forma information presents consolidated information as if the Merger had occurred on January 1, 2015:

	Pro Forma Nine Months Ended September 30,
	2016		2015
Net sales	$	5,345,365	$	6,053,330
Net income (1)	$	284,324	$	595,442
Net income (loss) attributable to noncontrolling interest	16,404		(5,953		)
Net income attributable to Westlake Chemical Corporation (1)	$	267,920	$	601,395
Earnings per common share attributable to Westlake Chemical Corporation
Basic	$	2.06	$	4.54
Diluted	$	2.05	$	4.52

_____________

(1) The 2016 pro forma net income amounts include Axiall's historical charges recorded during the eight-month period prior to the closing of the Merger for (1) divestitures; (2) restructuring; and (3) legal and settlement claims, net, of $26,666, $22,881 and $23,376, respectively. These amounts have not been eliminated for pro forma purposes because they do not relate to nonrecurring transaction specific costs related to the Merger.

Schedule of Business Acquisitions

The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition. The preliminary allocation of the consideration transferred is based on management's estimates, judgments and assumptions. When determining the fair values of assets acquired, liabilities assumed and noncontrolling interests of the acquiree, management made significant estimates, judgments and assumptions. These estimates, judgments and assumptions are subject to change upon final valuation and should be treated as preliminary values. Management estimated that consideration paid exceeded the fair value of the net assets acquired. Therefore, goodwill of $863,144 was recorded. The goodwill recognized is primarily attributable to synergies related to the Company's vinyls integration strategy that are expected to arise from the Merger. All of the goodwill is assigned to the Company's Vinyls segment. As a portion of the goodwill arising from the Merger is attributable to foreign operations, there will be a continuing foreign currency impact to goodwill on the financial statements.

Closing stock purchase:
Offer per share	$	33.00
Multiplied by number of shares outstanding at acquisition	67,277
Fair value of Axiall shares outstanding purchased by the Company	$	2,220,141
Axiall debt repaid at acquisition	247,135
Seller's transaction costs paid by the Company (1)	47,458
Fair value of Axiall share-based awards attributed to pre-combination service (2)	11,346
Purchase consideration transferred	$	2,526,080
Fair value of previously held equity interest in Axiall (3)	102,300
Total fair value allocated to net assets acquired	$	2,628,380

_____________

(1) Transactions costs incurred by the seller include legal and advisory costs incurred for the benefit of Axiall's former shareholders and board of directors to evaluate the Company's initial Merger proposals, explore strategic alternatives and negotiate the purchase price.

(2) The fair value of share-based awards attributable to pre-combination service includes the ratio of the pre-combination service performed to the original service period of the Axiall restricted share units and options, including related dividend equivalent rights.

(3) Prior to the Merger, the Company owned 3.1 million shares in Axiall. The investment in Axiall was carried at estimated fair value with unrealized gains recorded as a component of accumulated other comprehensive loss on the consolidated balance sheet. The Company recognized a $49,080 gain for the investment in other income, net in the consolidated statement of operations upon gaining control.

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The information below represents the preliminary purchase price allocation:

Cash	$	88,251
Accounts receivable	422,023
Income tax receivable	48,398
Inventories	302,868
Prepaid expenses and other current assets	48,435
Property, plant and equipment	3,189,582
Customer relationships (weighted average life of 10.7 years)	560,000
Other intangible assets:
Trade name (weighted average life of 6.8 years)	50,000
Technology (weighted average life of 5.4 years)	41,500
Supply contracts and leases (weighted average life of 6.0 years)	26,710
Other assets	105,214
Total assets acquired	4,882,981
Accounts and notes payable	253,967
Interest payable	8,154
Income tax payable	1,921
Accrued compensation	30,057
Accrued liabilities	165,793
Deferred income taxes	973,799
Tax reserve non-current	3,130
Pension and other post retirement obligations	311,106
Other liabilities	114,528
Long-term debt	1,187,290
Total liabilities assumed	3,049,745
Total identifiable net assets acquired	1,833,236
Noncontrolling interest	(68,000		)
Goodwill	863,144
Total purchase consideration	$	2,628,380

XML

Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Investments in available-for-sale securities at December 31, 2015 were classified as follows:

	December 31, 2015
Current	$	520,144
Non-current	48,081
Total available-for-sale securities	$	568,225

Available-for-sale Securities

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company's available-for-sale securities were as follows:

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	336,665	$	55	$	(1,076	)	$	335,644
U.S. government debt (2)	135,226		2		(374		)	134,854
Asset-backed securities	49,759		2		(115		)	49,646
Equity securities	54,371		466		(6,756		)	48,081
Total available-for-sale securities	$	576,021	$	525	$	(8,321	)	$	568,225

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S. government agency mortgage-backed securities.

Schedule of Realized Gain (Loss)

The proceeds from sales and maturities of available-for-sale securities included in the consolidated statements of cash flows and the gross realized gains and losses included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Proceeds from sales and maturities of securities	$	360,506	$	1,019	$	662,938	$	16,056
Gross realized gains	52,414		—		53,755		3,795
Gross realized losses	13		—		35		—

XML

Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2016

Accounts Receivable, Net [Abstract]

Schedule Of Accounts Receivable

Accounts receivable consist of the following:

	September 30, 2016			December 31, 2015
Trade customers	$	923,499		$	438,538
Allowance for doubtful accounts	(15,322		)	(14,095		)
	908,177			424,443
Federal and state taxes	134,733			60,748
Other	27,591			23,341
Accounts receivable, net	$	1,070,501		$	508,532

XML

Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Schedule Of Inventory

Inventories consist of the following:

	September 30, 2016		December 31, 2015
Finished products	$	466,165	$	253,338
Feedstock, additives and chemicals	199,827		106,435
Materials and supplies	78,544		74,287
Inventories	$	744,536	$	434,060

XML

Other Assets (Tables)

9 Months Ended

Sep. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The gross carrying amounts of goodwill and the changes in the carrying amount of goodwill for the nine months ended September 30, 2016 were as follows:

	Olefins Segment		Vinyls Segment		Total
Balance at December 31, 2015	$	29,990	$	32,026	$	62,016
Goodwill acquired during the period	—		863,144		863,144
Effects of changes in foreign exchange rates	—		540		540
Balance at September 30, 2016	$	29,990	$	895,710	$	925,700

XML

Accounts and Notes Payable (Tables)

9 Months Ended

Sep. 30, 2016

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

Accounts and notes payable consist of the following:

	September 30, 2016		December 31, 2015
Accounts payable	$	502,378	$	229,219
Notes payable to banks	1,010		6,110
Accounts and notes payable	$	503,388	$	235,329

XML

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Schedule Of Long-Term Debt

Long-term debt consists of the following:

	September 30, 2016							December 31, 2015
	Principal Amount		Unamortized Premium, Discount and Debt Issuance Costs (1)			Net Long-term Debt		Principal Amount		Unamortized Discount and Debt Issuance Costs  (1)			Net Long-term Debt
Revolving credit facility	$	325,000	$	—		$	325,000	$	—	$	—		$	—
4.625% senior notes due 2021 (the    "4.625% Westlake 2021 Senior Notes")	624,793		28,463			653,256		—		—			—
4.625% senior notes due 2021    (the "4.625% Subsidiary 2021 Senior    Notes")	63,207		3,036			66,243		—		—			—
3.60% senior notes due 2022	250,000		(1,976		)	248,024		250,000		(2,232		)	247,768
4.875% senior notes due 2023 (the    "4.875% Westlake 2023 Senior Notes")	433,793		13,958			447,751		—		—			—
4.875% senior notes due 2023    (the "4.875% Subsidiary 2023 Senior    Notes")	16,207		562			16,769		—		—			—
3.60% senior notes due 2026    (the "3.60% 2026 Senior Notes")	750,000		(10,918		)	739,082		—		—			—
Loan related to tax-exempt waste    disposal revenue bonds due 2027	10,889		—			10,889		10,889		—			10,889
6 ½% senior notes due 2029	100,000		(934		)	99,066		100,000		(989		)	99,011
6 ¾% senior notes due 2032	250,000		(1,913		)	248,087		250,000		(2,002		)	247,998
6 ½% senior notes due 2035 (the "6 ½%    2035 GO Zone Senior Notes")	89,000		(851		)	88,149		89,000		(884		)	88,116
6 ½% senior notes due 2035 (the "6 ½%    2035 IKE Zone Senior Notes")	65,000		(610		)	64,390		65,000		(634		)	64,366
5.0% senior notes due 2046 (the "5.0%    2046 Senior Notes")	700,000		(26,121		)	673,879		—		—			—
Long-term debt, net	$	3,677,889	$	2,696		$	3,680,585	$	764,889	$	(6,741	)	$	758,148

_____________

(1) Includes unamortized debt issuance costs of $21,286 and $5,967 at September 30, 2016 and December 31, 2015, respectively.

XML

Pension and Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost for the Company's pension plans are as follows:

	Three Months Ended September 30,											Nine Months Ended September 30,
	2016						2015					2016						2015
	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans		U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
Service cost	$	315		$	318		$	—		$	416	$	315		$	777		$	29		$	1,248
Expected administrative    expenses	730			—			—			—		730			—			—			—
Interest cost	2,191			622			487			528		1,553			1,763			1,519			1,585
Expected return on plan assets	(3,800		)	(50		)	(712		)	—		(5,260		)	(50		)	(2,237		)	—
Amortization of net loss	338			—			333			263		978			—			942			789
Net periodic benefit (income)    cost	$	(226	)	$	890		$	108		$	1,207	$	(1,684	)	$	2,490		$	253		$	3,622

Components of net periodic benefit cost for the Company's other post-retirement benefits are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016				2015		2016				2015
	U.S. Plans		Non-U.S. Plans		U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans
Service cost	$	72	$	1	$	6	$	81	$	1	$	17
Interest cost	250		3		149		540		3		448
Amortization of net loss	31		—		96		94		—		288
Net periodic benefit cost	$	353	$	4	$	251	$	715	$	4	$	753

XML

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Schedule of Stockholders Equity

Changes in stockholders' equity for the nine months ended September 30, 2016 and 2015 were as follows:

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2015	$	1,347	$	(258,312	)	$	542,148		$	3,109,987		$	(129,292	)	$	296,053		$	3,561,931
Net income	—		—			—			299,914			—			14,656			314,570
Other comprehensive income,    net of income taxes:
Pension and other post-    retirement benefits    liability	—		—			—			—			409			—			409
Foreign currency    translation adjustments	—		—			—			—			15,758			—			15,758
Net unrealized holding    gains on investments	—		—			—			—			4,999			—			4,999
Common stock repurchased	—		(66,725		)	—			—			—			—			(66,725		)
Shares issued—stock-    based compensation	—		5,057			(3,407		)	—			—			—			1,650
Stock-based compensation,    net of tax on stock options    exercised	—		—			7,778			—			—			—			7,778
Dividends paid	—		—			—			(71,933		)	—			—			(71,933		)
Distributions to noncontrolling    interests	—		—			—			—			—			(12,300		)	(12,300		)
Noncontrolling interest in    acquired business	—		—			—			—			—			68,000			68,000
Balances at September 30, 2016	$	1,347	$	(319,980	)	$	546,519		$	3,337,968		$	(108,126	)	$	366,409		$	3,824,137

	Common Stock		Common Stock, Held in Treasury			Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive  Income (Loss)			Noncontrolling Interests			Total
Balances at December 31, 2014	$	1,347	$	(96,372	)	$	530,441		$	2,555,528		$	(79,433	)	$	290,377		$	3,201,888
Net income	—		—			—			535,041			—			13,847			548,888
Other comprehensive income    (loss), net of income taxes
Pension and other post-    retirement benefits    liability	—		—			—			—			1,190			—			1,190
Foreign currency    translation adjustments	—		—			—			—			(43,746		)	—			(43,746		)
Net unrealized holding    gains on investments	—		—			—			—			124			—			124
Common stock repurchased	—		(122,249		)	—			—			—			—			(122,249		)
Shares issued—stock-    based compensation	—		1,079			(95		)	—			—			—			984
Stock-based compensation,    net of tax on stock options    exercised	—		—			9,996			—			—			—			9,996
Dividends paid	—		—			—			(67,852		)	—			—			(67,852		)
Distributions to noncontrolling    interests	—		—			—			—			—			(10,982		)	(10,982		)
Noncontrolling interest in    acquired business	—		—			—			—			—			1,597			1,597
Balances at September 30, 2015	$	1,347	$	(217,542	)	$	540,342		$	3,022,717		$	(121,865	)	$	294,839		$	3,519,838

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2016 and 2015 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains (Losses) on Investments, Net of Tax (1)			Total
Balances at December 31, 2015	$	(8,607	)	$	(115,690	)	$	(4,995	)	$	(129,292	)
Other comprehensive (loss) income before    reclassifications	(252		)	15,758			57,550			73,056
Amounts reclassified from accumulated other    comprehensive loss (income)	661			—			(52,551		)	(51,890		)
Net other comprehensive income for the period	409			15,758			4,999			21,166
Balances at September 30, 2016	$	(8,198	)	$	(99,932	)	$	4		$	(108,126	)

_____________

(1) Includes other comprehensive income from equity method investment.

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange, Net of Tax			Net Unrealized Holding Gains on Investments, Net of Tax			Total
Balances at December 31, 2014	$	(23,442	)	$	(56,224	)	$	233		$	(79,433	)
Other comprehensive (loss) income before    reclassifications	(128		)	(43,746		)	2,556			(41,318		)
Amounts reclassified from accumulated other    comprehensive loss (income)	1,318			—			(2,432		)	(1,114		)
Net other comprehensive income (loss) for the period	1,190			(43,746		)	124			(42,432		)
Balances at September 30, 2015	$	(22,252	)	$	(99,970	)	$	357		$	(121,865	)

Reclassification out of Accumulated Other Comprehensive Income (Loss)

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the nine months ended September 30, 2016 and 2015:

Details about Accumulated    Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016			2015
Amortization of pension and    other post-retirement items
Net loss	(1)	$	(369	)	$	(692	)	$	(1,072	)	$	(2,019	)
	Provision for    income taxes	141			241			411			701
		(228		)	(451		)	(661		)	(1,318		)
Net unrealized gains on    available-for-sale    investments
Realized gain on    available-for-sale    investments	Other income, net	52,401			—			53,720			3,795
	Provision for    income taxes	(696		)	—			(1,169		)	(1,363		)
		51,705			—			52,551			2,432
Total reclassifications for    the period		$	51,477		$	(451	)	$	51,890		$	1,114

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 11 (Employee Benefits) to the financial statements included in the 2015 Form 10-K.

XML

Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Values of Derivatives Instruments in Consolidated Balance Sheets

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	2,221	$	3,465
Commodity forward contracts	Other assets, net	3,674		2,088
Total derivative assets		$	5,895	$	5,553

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		September 30, 2016		December 31, 2015
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	3,196	$	9,325
Commodity forward contracts	Other liabilities	6,811		12,437
Total derivative liabilities		$	10,007	$	21,762

Impact of Derivative Instruments Not Designated as Fair Value Hedges

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized  in Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2016			2015			2016		2015
Commodity forward contracts	Gross profit	$	(7,840	)	$	(9,314	)	$	7,784	$	(4,478	)

Offsetting Assets

The following tables present the Company's derivative assets and derivative liabilities reported on the consolidated balance sheets and derivative assets and derivative liabilities subject to enforceable master netting arrangements.

	Derivative Assets as of
	September 30, 2016		December 31, 2015
Derivative assets subject to enforceable master netting arrangements	$	—	$	—
Derivative assets not subject to enforceable master netting arrangements	3,560		462
Total derivative assets	$	3,560	$	462

	September 30, 2016							December 31, 2015
Offsetting of Derivative Assets	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Assets Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	2,335	$	(2,335	)	$	—	$	5,091	$	(5,091	)	$	—

	Derivative Liabilities as of
	September 30, 2016		December 31, 2015
Derivative liabilities subject to enforceable master netting arrangements	$	1,889	$	5,803
Derivative liabilities not subject to enforceable master netting arrangements	5,782		10,868
Total derivative liabilities	$	7,671	$	16,671

Offsetting Liabilities

	Derivative Liabilities as of
	September 30, 2016		December 31, 2015
Derivative liabilities subject to enforceable master netting arrangements	$	1,889	$	5,803
Derivative liabilities not subject to enforceable master netting arrangements	5,782		10,868
Total derivative liabilities	$	7,671	$	16,671

	September 30, 2016							December 31, 2015
Offsetting of Derivative Liabilities	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts of Liabilities Presented in the Consolidated Balance Sheet
Commodity forward contracts	$	4,224	$	(2,335	)	$	1,889	$	10,894	$	(5,091	)	$	5,803

	September 30, 2016						December 31, 2015
Derivative Liabilities by Counterparty	Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount		Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		Gross Amounts Not Offset in the Consolidated Balance Sheet		Net Amount
Counterparty A	$	1,889	$	—	$	1,889	$	5,564	$	—	$	5,564
Counterparty B	—		—		—		239		—		239
Total	$	1,889	$	—	$	1,889	$	5,803	$	—	$	5,803

XML

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Summary Of Assets And Liabilities Accounted At Fair Value On A Recurring Basis

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	September 30, 2016
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	1,551		$	4,344		$	5,895
Risk management liabilities—Commodity forward contracts	(8,091		)	(1,916		)	(10,007		)
	December 31, 2015
	Level 1			Level 2			Total
Derivative instruments
Risk management assets—Commodity forward contracts	$	5,553		$	—		$	5,553
Risk management liabilities—Commodity forward contracts	(11,648		)	(10,114		)	(21,762		)
Marketable securities
Available-for-sale securities	48,081			520,144			568,225

Summary Of Carrying And Fair Values Of Long-Term Debt

The carrying and fair values of the Company's long-term debt are summarized in the table below. The fair value of the Company's long-term debt instruments is determined using a market approach, based upon quotes from financial reporting services. Because the Company's long-term debt instruments may not be actively 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.

	September 30, 2016				December 31, 2015
	Carrying Value		Fair Value		Carrying Value		Fair Value
Revolving credit facility	$	325,000	$	325,000	$	—	$	—
4.625% Westlake 2021 Senior Notes	653,256		653,715		—		—
4.625% Subsidiary 2021 Senior Notes	66,243		66,058		—		—
3.60% senior notes due 2022	248,024		251,480		247,768		244,828
4.875% Westlake 2023 Senior Notes	447,751		454,151		—		—
4.875% Subsidiary 2023 Senior Notes	16,769		16,954		—		—
3.60% 2026 Senior Notes	739,082		752,055		—		—
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889		10,889		10,889
6 ½% senior notes due 2029	99,066		117,726		99,011		117,153
6 ¾% senior notes due 2032	248,087		265,383		247,998		268,490
6 ½% 2035 GO Zone Senior Notes	88,149		105,298		88,116		106,491
6 ½% 2035 IKE Zone Senior Notes	64,390		76,837		64,366		76,741
5.0% 2046 Senior Notes	673,879		705,985		—		—

XML

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Summary of Income Tax Examinations

Reconciliations of the unrecognized tax benefits for the three months ended September 30, 2016 are set forth in the table below:

Balance as of June 30, 2016	$	—
Amounts attributable to Axiall pre-acquistion	5,471
Additions during the three months ended September 30, 2016	3,444
Reduction during the three months ended September 30, 2016 due to expiration of statute of limitations	(92		)
Foreign currency translation	(5		)
Balance as of September 30, 2016	$	8,818

XML

Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Less:
Net income attributable to participating securities	(294		)	(195		)	(1,347		)	(653		)
Net income attributable to common shareholders	$	65,368		$	183,409		$	298,567		$	534,388

Reconciliation Of Denominator For Basic And Diluted Earnings Per Share

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Weighted average common shares—basic	128,793,661		131,664,296		129,519,577		132,301,814
Plus incremental shares from:
Assumed exercise of options	586,295		456,939		584,320		484,720
Weighted average common shares—diluted	129,379,956		132,121,235		130,103,897		132,786,534
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	0.51	$	1.39	$	2.31	$	4.04
Diluted	$	0.51	$	1.39	$	2.29	$	4.02

XML

Supplemental Information (Tables)

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other Income, Net

Other Income, Net

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Interest income	$	537		$	1,631		$	6,899		$	3,383
Dividend income	868			—			5,142			3,328
Acquisition-related financing costs	(11,420		)	—			(12,220		)	—
Foreign exchange currency (losses) gains, net	(1,281		)	(731		)	(2,435		)	1,140
Impairment of equity method investment	—			—			—			(4,925		)
Gain realized on previously held shares of Axiall    common stock	49,080			—			49,080			—
Gain on acquisition and related expenses, net	—			—			—			20,430
Gains from sales of securities, net	3,321			—			4,640			3,795
Other	160			1,736			985			6,639
Other income, net	$	41,265		$	2,636		$	52,091		$	33,790

XML

Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Segment Reporting Information

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Net external sales
Olefins
Polyethylene	$	380,810	$	423,631	$	1,098,500	$	1,283,545
Styrene, feedstock and other	116,555		164,466		324,369		508,507
Total Olefins	497,365		588,097		1,422,869		1,792,052
Vinyls
PVC, caustic soda and other	599,276		468,235		1,492,650		1,315,101
Building products	182,387		131,705		424,757		369,417
Total Vinyls	781,663		599,940		1,917,407		1,684,518
	$	1,279,028	$	1,188,037	$	3,340,276	$	3,476,570

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Intersegment sales
Olefins	$	30,614		$	28,551		$	85,856		$	78,654
Vinyls	2,130			341			2,719			1,098
	$	32,744		$	28,892		$	88,575		$	79,752
Income (loss) from operations
Olefins	$	118,475		$	196,703		$	408,274		$	608,744
Vinyls	22,235			67,779			136,559			202,831
Corporate and other	(94,147		)	(10,454		)	(116,056		)	(32,893		)
	$	46,563		$	254,028		$	428,777		$	778,682
Depreciation and amortization
Olefins	$	36,649		$	27,678		$	95,582		$	82,240
Vinyls	56,136			33,432			128,691			97,615
Corporate and other	1,444			138			2,920			374
	$	94,229		$	61,248		$	227,193		$	180,229
Other income (expense), net
Olefins	$	1,101		$	1,323		$	3,706		$	3,770
Vinyls	(1,226		)	10			1,722			6,927
Corporate and other	41,390			1,303			46,663			23,093
	$	41,265		$	2,636		$	52,091		$	33,790
Provision for (benefit from) income taxes
Olefins	$	31,956		$	45,865		$	136,429		$	186,534
Vinyls	(3,912		)	15,812			29,655			55,270
Corporate and other	(34,596		)	(1,644		)	(36,752		)	(4,980		)
	$	(6,552	)	$	60,033		$	129,332		$	236,824
Capital expenditures
Olefins	$	96,469		$	69,885		$	285,359		$	206,719
Vinyls	83,523			53,510			180,392			114,935
Corporate and other	178			1,909			1,579			7,582
	$	180,170		$	125,304		$	467,330		$	329,236

Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Income from operations	$	46,563		$	254,028		$	428,777		$	778,682
Interest expense	(24,366		)	(8,211		)	(36,966		)	(26,760		)
Other income, net	41,265			2,636			52,091			33,790
Income before income taxes	$	63,462		$	248,453		$	443,902		$	785,712

Total Assets

	September 30, 2016		December 31, 2015
Total assets
Olefins	$	2,094,163	$	1,869,888
Vinyls	8,262,971		2,638,833
Corporate and other	539,915		1,060,564
	$	10,897,049	$	5,569,285

XML

Guarantor Disclosures (Tables)

9 Months Ended

Sep. 30, 2016

Guarantees [Abstract]

Condensed Consolidating Financial Information Balance Sheet

Condensed Consolidating Financial Information as of September 30, 2016

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	144,899	$	1,884	$	233,736	$	—		$	380,519
Accounts receivable, net	1,457		2,838,917		765,949		(2,535,822		)	1,070,501
Inventories	—		329,233		415,303		—			744,536
Prepaid expenses and other current assets	8,257		16,264		43,741		(13,394		)	54,868
Restricted cash	—		—		169,320		—			169,320
Total current assets	154,613		3,186,298		1,628,049		(2,549,216		)	2,419,744
Property, plant and equipment, net	—		1,538,148		4,912,799		—			6,450,947
Other assets, net	9,074,810		418,588		1,695,970		(9,163,010		)	2,026,358
Total assets	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049
Current liabilities
Accounts and notes payable	$	2,172,989	$	466,907	$	387,807	$	(2,524,315	)	$	503,388
Accrued liabilities	12,022		162,645		402,815		(24,901		)	552,581
Term loan	—		—		148,681		—			148,681
Total current liabilities	2,185,011		629,552		939,303		(2,549,216		)	1,204,650
Long-term debt, net	3,586,684		775,995		2,199,812		(2,881,906		)	3,680,585
Deferred income taxes	—		596,928		1,022,226		(12,070		)	1,607,084
Pension and other liabilities	—		48,837		531,756		—			580,593
Total liabilities	5,771,695		2,051,312		4,693,097		(5,443,192		)	7,072,912
Total Westlake Chemical Corporation stockholders' equity	3,457,728		3,091,722		3,177,312		(6,269,034		)	3,457,728
Noncontrolling interests	—		—		366,409		—			366,409
Total equity	3,457,728		3,091,722		3,543,721		(6,269,034		)	3,824,137
Total liabilities and equity	$	9,229,423	$	5,143,034	$	8,236,818	$	(11,712,226	)	$	10,897,049

Condensed Consolidating Financial Information as of December 31, 2015

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	303,131	$	6,818	$	352,576	$	—		$	662,525
Marketable securities	520,144		—		—		—			520,144
Accounts receivable, net	10,943		2,474,963		190,384		(2,167,758		)	508,532
Inventories	—		287,114		146,946		—			434,060
Prepaid expenses and other current assets	2,201		10,186		4,981		(2,879		)	14,489
Deferred income taxes	702		28,325		6,412		—			35,439
Total current assets	837,121		2,807,406		701,299		(2,170,637		)	2,175,189
Property, plant and equipment, net	—		1,476,642		1,527,425		—			3,004,067
Other assets, net	5,003,096		914,823		1,442,436		(6,970,326		)	390,029
Total assets	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285
Current liabilities
Accounts payable	$	1,817,963	$	374,468	$	185,931	$	(2,143,033	)	$	235,329
Accrued liabilities	9,117		163,167		142,633		(27,604		)	287,313
Total current liabilities	1,827,080		537,635		328,564		(2,170,637		)	522,642
Long-term debt, net	747,259		744,405		—		(733,516		)	758,148
Deferred income taxes	—		513,692		68,478		(6,567		)	575,603
Pension and other liabilities	—		49,202		101,759		—			150,961
Total liabilities	2,574,339		1,844,934		498,801		(2,910,720		)	2,007,354
Total Westlake Chemical Corporation stockholders' equity	3,265,878		3,353,937		2,876,306		(6,230,243		)	3,265,878
Noncontrolling interests	—		—		296,053		—			296,053
Total equity	3,265,878		3,353,937		3,172,359		(6,230,243		)	3,561,931
Total liabilities and equity	$	5,840,217	$	5,198,871	$	3,671,160	$	(9,140,963	)	$	5,569,285

Condensed Consolidating Financial Information Statement Of Operations

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	775,474		$	823,238		$	(319,684	)	$	1,279,028
Cost of sales	—			677,085			714,365			(314,555		)	1,076,895
Gross profit	—			98,389			108,873			(5,129		)	202,133
Selling, general and administrative expenses	2,092			31,180			44,586			(5,129		)	72,729
Transaction and integration-related costs	—			35,379			47,462			—			82,841
(Loss) income from operations	(2,092		)	31,830			16,825			—			46,563
Interest expense	(22,130		)	(10,247		)	(9,117		)	17,128			(24,366		)
Other income (expense), net	35,405			(8,622		)	31,610			(17,128		)	41,265
Income before income taxes	11,183			12,961			39,318			—			63,462
(Benefit from) provision for income taxes	(2,088		)	18,987			(23,451		)	—			(6,552		)
Equity in net income of subsidiaries	52,391			—			—			(52,391		)	—
Net income (loss)	65,662			(6,026		)	62,769			(52,391		)	70,014
Net income attributable to noncontrolling interests	—			—			4,352			—			4,352
Net income (loss) attributable to Westlake Chemical Corporation	$	65,662		$	(6,026	)	$	58,417		$	(52,391	)	$	65,662
Comprehensive income (loss) attributable to Westlake Chemical Corporation	$	39,637		$	(5,923	)	$	45,945		$	(40,022	)	$	39,637

Condensed Consolidating Financial Information for the Three Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	901,006		$	596,860	$	(309,829	)	$	1,188,037
Cost of sales	—			712,681			469,137		(305,057		)	876,761
Gross profit	—			188,325			127,723		(4,772		)	311,276
Selling, general and administrative expenses	804			37,156			24,060		(4,772		)	57,248
(Loss) income from operations	(804		)	151,169			103,663		—			254,028
Interest expense	(10,405		)	(5,711		)	—		7,905			(8,211		)
Other income, net	1,239			203			9,099		(7,905		)	2,636
(Loss) income before income taxes	(9,970		)	145,661			112,762		—			248,453
(Benefit from) provision for income taxes	(3,249		)	53,131			10,151		—			60,033
Equity in net income of subsidiaries	190,325			—			—		(190,325		)	—
Net income	183,604			92,530			102,611		(190,325		)	188,420
Net income attributable to noncontrolling interests	—			—			4,816		—			4,816
Net income attributable to Westlake Chemical Corporation	$	183,604		$	92,530		$	97,795	$	(190,325	)	$	183,604
Comprehensive income attributable to Westlake Chemical Corporation	$	181,663		$	92,781		$	96,062	$	(188,843	)	$	181,663

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,357,769		$	1,945,866		$	(963,359	)	$	3,340,276
Cost of sales	—			2,018,282			1,570,669			(947,759		)	2,641,192
Gross profit	—			339,487			375,197			(15,600		)	699,084
Selling, general and administrative expenses	3,648			104,488			87,221			(15,600		)	179,757
Transaction and integration-related costs	—			43,088			47,462			—			90,550
(Loss) income from operations	(3,648		)	191,911			240,514			—			428,777
Interest expense	(43,228		)	(19,051		)	(9,117		)	34,430			(36,966		)
Other income (expense), net	40,807			(12,057		)	57,771			(34,430		)	52,091
(Loss) income before income taxes	(6,069		)	160,803			289,168			—			443,902
(Benefit from) provision for income taxes	(8,268		)	136,856			744			—			129,332
Equity in net income of subsidiaries	297,715			—			—			(297,715		)	—
Net income	299,914			23,947			288,424			(297,715		)	314,570
Net income attributable to noncontrolling interests	—			—			14,656			—			14,656
Net income attributable to Westlake Chemical Corporation	$	299,914		$	23,947		$	273,768		$	(297,715	)	$	299,914
Comprehensive income attributable to Westlake Chemical Corporation	$	321,080		$	24,356		$	293,859		$	(318,215	)	$	321,080

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	2,677,773		$	1,727,561	$	(928,764	)	$	3,476,570
Cost of sales	—			2,078,730			1,362,710		(913,873		)	2,527,567
Gross profit	—			599,043			364,851		(14,891		)	949,003
Selling, general and administrative expenses	1,617			115,400			68,195		(14,891		)	170,321
(Loss) income from operations	(1,617		)	483,643			296,656		—			778,682
Interest expense	(31,726		)	(18,353		)	—		23,319			(26,760		)
Other income (expense), net	17,627			(4,743		)	44,225		(23,319		)	33,790
(Loss) income before income taxes	(15,716		)	460,547			340,881		—			785,712
(Benefit from) provision for income taxes	(5,226		)	222,743			19,307		—			236,824
Equity in net income of subsidiaries	545,531			—			—		(545,531		)	—
Net income	535,041			237,804			321,574		(545,531		)	548,888
Net income attributable to noncontrolling interests	—			—			13,847		—			13,847
Net income attributable to Westlake Chemical Corporation	$	535,041		$	237,804		$	307,727	$	(545,531	)	$	535,041
Comprehensive income attributable to Westlake Chemical Corporation	$	492,609		$	238,433		$	264,542	$	(502,975	)	$	492,609

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	299,914		$	23,947		$	288,424		$	(297,715	)	$	314,570
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	747			98,658			128,806			—			228,211
Deferred income taxes	(5,178		)	111,795			(707		)	—			105,910
Net changes in working capital and other	(314,423		)	93,280			(181,103		)	297,715			(104,531		)
Net cash (used for) provided by operating activities	(18,940		)	327,680			235,420			—			544,160
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			(2,437,829		)	—			(2,437,829		)
Additions to cost method investment	—			—			(4,000		)	—			(4,000		)
Additions to property, plant and equipment	—			(163,579		)	(303,751		)	—			(467,330		)
Proceeds from disposition of assets	—			48			165			—			213
Proceeds from sales and maturities of securities	658,338			—			4,600			—			662,938
Purchase of securities	(138,422		)	—			—			—			(138,422		)
Settlements of derivative instruments	—			(4,655		)	—			—			(4,655		)
Net cash provided by (used for) investing activities	519,916			(168,186		)	(2,740,815		)	—			(2,389,085		)
Cash flows from financing activities
Intercompany financing	(2,242,604		)	(366,639		)	2,609,243			—			—
Capitalized debt issuance costs	(33,617		)	—			(1,590		)	—			(35,207		)
Dividends paid	(71,933		)	—			—			—			(71,933		)
Distributions paid	—			202,211			(214,511		)	—			(12,300		)
Proceeds from debt issuance	1,428,512			—			—			—			1,428,512
Proceeds from exercise of stock options	1,650			—			—			—			1,650
Proceeds from issuance of notes payable	—			—			5,597			—			5,597
Proceeds from term loan and drawdown of revolver	450,000			—			150,000			—			600,000
Restricted cash associated with term loan	—			—			(154,000		)	—			(154,000		)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations		Consolidated
Repayment of notes payable	—			—			(10,602		)	—		(10,602		)
Repayment of revolver	(125,000		)	—			—			—		(125,000		)
Repurchase of common stock for treasury	(67,406		)	—			—			—		(67,406		)
Windfall tax benefits from share-based payment arrangements	1,190			—			—			—		1,190
Net cash (used for) provided by financing activities	(659,208		)	(164,428		)	2,384,137			—		1,560,501
Effect of exchange rate changes on cash and cash equivalents	—			—			2,418			—		2,418
Net decrease in cash and cash equivalents	(158,232		)	(4,934		)	(118,840		)	—		(282,006		)
Cash and cash equivalents at beginning of period	303,131			6,818			352,576			—		662,525
Cash and cash equivalents at end of period	$	144,899		$	1,884		$	233,736		$	—	$	380,519

Condensed Consolidating Financial Information for the Nine Months Ended September 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	535,041		$	237,804		$	321,574		$	(545,531	)	$	548,888
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	1,504			81,770			98,459			—			181,733
Deferred income taxes	87			3,972			3,526			—			7,585
Net changes in working capital and other	(567,137		)	110,574			14,126			545,531			103,094
Net cash (used for) provided by operating activities	(30,505		)	434,120			437,685			—			841,300
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(137,844		)	(191,392		)	—			(329,236		)
Proceeds from disposition of assets	—			—			17			—			17
Proceeds from disposition of equity method investment	—			27,865			—			—			27,865
Proceeds from sales and maturities of securities	16,056			—			—			—			16,056
Purchase of securities	(282,542		)	—			—			—			(282,542		)
Settlements of derivative instruments	—			(1,535		)	—			—			(1,535		)
Net cash used for investing activities	(266,486		)	(111,514		)	(175,593		)	—			(553,593		)
Cash flows from financing activities
Intercompany financing	467,360			(570,217		)	102,857			—			—
Dividends paid	(67,852		)	—			—			—			(67,852		)
Distributions paid	—			249,999			(260,981		)	—			(10,982		)
Proceeds from exercise of stock options	984			—			—			—			984
Proceeds from issuance of notes payable	—			—			19,483			—			19,483
Repayment of notes payable	—			—			(32,954		)	—			(32,954		)
Repurchase of common stock for treasury	(114,254		)	—			—			—			(114,254		)
Windfall tax benefits from share-based payment arrangements	2,452			—			—			—			2,452
Net cash provided by (used for) financing activities	288,690			(320,218		)	(171,595		)	—			(203,123		)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries		Non- Guarantor Subsidiaries			Eliminations		Consolidated
Effect of exchange rate changes on cash and cash equivalents	—			—		(3,260		)	—		(3,260		)
Net (decrease) increase in cash and cash equivalents	(8,301		)	2,388		87,237			—		81,324
Cash and cash equivalents at beginning of period	655,947			3,047		221,607			—		880,601
Cash and cash equivalents at end of period	$	647,646		$	5,435	$	308,844		$	—	$	961,925

XML

Basis of Financial Statements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred charges and other assets, net	$ 310,456	$ 176,625
Previously reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred charges and other assets, net		173,384
Accounting Standards Update 2015-03 [Member] | Other assets, net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net		176,625
Accounting Standards Update 2015-03 [Member] | Other assets, net [Member] | Previously reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net		173,384
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net		758,148
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member] | Previously reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net		$ 764,115

XML

Acquisition (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Aug. 31, 2016	Aug. 30, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Aug. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Transaction and integration-related costs				$ 82,841	$ 0		$ 90,550	$ 0
Goodwill			$ 925,700	925,700			925,700		$ 62,016
Axiall Corporation [Member]
Business Acquisition [Line Items]
Equity interest in acquiree held prior to combination, shares		3.1
Offer price per share (usd per share)	$ 33.00
Purchase price	$ 2,526,080
Contribution to net sales			257,407
Contribution to net loss			(47,164)
Divestitures						$ 26,666
Restructuring						22,881
Legal and settlement claims, net						$ 23,376
Transaction and integration-related costs							90,550
Professional fees			$ 43,895	$ 43,895			43,895
Change-in-control severance and other benefit costs							$ 46,655
Goodwill	$ 863,144

XML

Acquisition (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Business Combinations [Abstract]
Net sales	$ 5,345,365	$ 6,053,330
Net income	284,324	595,442
Net income (loss) attributable to noncontrolling interest	16,404	(5,953)
Net income attributable to Westlake Chemical Corporation	$ 267,920	$ 601,395
Basic (in dollars per share)	$ 2.06	$ 4.54
Diluted (in dollars per share)	$ 2.05	$ 4.52

XML

Acquisition (Allocation of Purchase Consideration) (Details) - Axiall Corporation [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Aug. 31, 2016	Aug. 30, 2016
Business Acquisition [Line Items]
Offer price per share (usd per share)	$ 33.00
Multiplied by number of shares outstanding at acquisition	67,277
Fair value of Axiall shares outstanding purchased by the Company	$ 2,220,141
Axiall debt repaid at acquisition	247,135
Fair value of Axiall share-based awards attributed to pre-combination service	11,346
Seller's transaction costs paid by the Company	47,458
Purchase price	2,526,080
Fair value of previously held equity interest in Axiall	102,300
Total fair value allocated to net assets acquired	2,628,380
Equity interest in acquiree held prior to combination, shares		3,100
Step acquisition, equity interest in acquiree, remeasurement gain (loss), net	$ 49,080

XML

Acquisition (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 925,700	$ 62,016
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average useful life	10 years 8 months 12 days
Trade Name [Member]
Business Acquisition [Line Items]
Weighted average useful life	6 years 9 months 18 days
Technology [Member]
Business Acquisition [Line Items]
Weighted average useful life	5 years 4 months 24 days
Supply Contracts and Leases [Member]
Business Acquisition [Line Items]
Weighted average useful life	6 years
Axiall Corporation [Member]
Business Acquisition [Line Items]
Cash	$ 88,251
Accounts receivable	422,023
Income tax receivable	48,398
Inventories	302,868
Prepaid expenses and other current assets	48,435
Property, plant and equipment	3,189,582
Other assets	105,214
Total assets acquired	4,882,981
Accounts and notes payable	253,967
Interest payable	8,154
Income tax payable	1,921
Accrued compensation	30,057
Accrued liabilities	165,793
Deferred income taxes	973,799
Tax reserve non-current	3,130
Pension and other post retirement obligations	311,106
Other liabilities	114,528
Long-term debt	1,187,290
Total liabilities assumed	3,049,745
Total identifiable net assets acquired	1,833,236
Noncontrolling interest	(68,000)
Goodwill	863,144
Total purchase consideration	2,628,380
Axiall Corporation [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	560,000
Axiall Corporation [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	50,000
Axiall Corporation [Member] | Technology [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	41,500
Axiall Corporation [Member] | Supply Contracts and Leases [Member]
Business Acquisition [Line Items]
Finite-lived intangibles	$ 26,710

XML

Financial Instruments (Cash Equivalents) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Cash Equivalents [Line Items]
Restricted cash	$ 195,705	$ 0
Current	169,320	0
Noncurrent	26,385
Held-to-maturity Securities [Member]
Cash Equivalents [Line Items]
Cash equivalents	$ 1,942	$ 221,918

XML

Financial Instruments (Marketable Securities) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Investments, Debt and Equity Securities [Abstract]
Current	$ 520,144
Non-current	48,081
Total available-for-sale securities	$ 568,225

XML

Financial Instruments (Available-for-sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost					$ 576,021
Gross Unrealized Gains					525
Gross Unrealized Losses					(8,321)
Fair Value					568,225
Net unrealized gains (losses) on available-for-sale securities					(4,995)
Proceeds from sales and maturities of securities	$ 360,506	$ 1,019	$ 662,938	$ 16,056
Gross realized gains	52,414	0	53,755	3,795
Gross realized losses	$ 13	$ 0	$ 35	$ 0
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost					54,371
Gross Unrealized Gains					466
Gross Unrealized Losses					(6,756)
Fair Value					48,081
Corporate bond securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost					336,665
Gross Unrealized Gains					55
Gross Unrealized Losses					(1,076)
Fair Value					335,644
US government debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost					135,226
Gross Unrealized Gains					2
Gross Unrealized Losses					(374)
Fair Value					134,854
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost					49,759
Gross Unrealized Gains					2
Gross Unrealized Losses					(115)
Fair Value					49,646
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net of income tax expense (benefit) on available for sales securities					$ (2,801)

XML

Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accounts Receivable, Net [Abstract]
Trade customers	$ 923,499	$ 438,538
Allowance for doubtful accounts	(15,322)	(14,095)
Accounts receivable from trade customers, net	908,177	424,443
Federal and state taxes	134,733	60,748
Other	27,591	23,341
Accounts receivable, net	$ 1,070,501	$ 508,532

XML

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished products	$ 466,165	$ 253,338
Feedstock, additives and chemicals	199,827	106,435
Materials and supplies	78,544	74,287
Inventories	$ 744,536	$ 434,060

XML

Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	$ 6,450,947		$ 6,450,947		$ 3,004,067
Depreciation expense on property, plant and equipment	$ 75,143	$ 52,208	$ 189,114	$ 153,129

XML

Other Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other assets, net [Member]
Other Assets [Line Items]
Amortization expense	$ 19,175	$ 9,419	$ 38,340	$ 28,235

XML

Other Assets (Changes in Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 62,016
Goodwill acquired during the period	863,144
Effects of changes in foreign exchange rates	540
Ending Balance	925,700
Olefins [Member]
Goodwill [Roll Forward]
Beginning Balance	29,990
Goodwill acquired during the period	0
Effects of changes in foreign exchange rates	0
Ending Balance	29,990
Vinyls [Member]
Goodwill [Roll Forward]
Beginning Balance	32,026
Goodwill acquired during the period	863,144
Effects of changes in foreign exchange rates	540
Ending Balance	$ 895,710

XML

Accounts and Notes Payable (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 502,378	$ 229,219
Notes payable to banks	1,010	6,110
Accounts and notes payable	$ 503,388	$ 235,329

XML

Term Loan (Narrative) (Details) - USD ($)		2 Months Ended
	Aug. 10, 2016	Sep. 30, 2016	Sep. 10, 2016	Sep. 09, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Restricted cash		$ 195,705,000			$ 0
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150,000,000
Interest rate on outstanding term loan		2.82%
Restricted cash	$ 150,000,000
Percent increase In restricted cash based on non-u.s. dollar based deposits	5.00%
Percent of pledged membership interests	65.00%
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	2.00%
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	1.00%
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] | Bank of America, N.A. [Member]
Line of Credit Facility [Line Items]
Restricted cash			$ 75,000,000	$ 50,000,000
Period to increase bank deposits	30 days

XML

Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 07, 2016	Sep. 06, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Deferred charges and other assets, net	$ 310,456			$ 176,625
Principal Amount	3,677,889			764,889
Unamortized Discount and Debt Issuance Costs,	2,696			(6,741)
Long-term debt, net	3,680,585			758,148
Unamortized debt issuance costs	21,286			5,967
Previously reported [Member]
Debt Instrument [Line Items]
Deferred charges and other assets, net				173,384
Long-term debt, net				764,115
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal Amount				0
Unamortized Discount and Debt Issuance Costs,	0			0
Long-term debt, net	325,000			0
Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	10,889			10,889
Unamortized Discount and Debt Issuance Costs,	0			0
Long-term debt, net	10,889			10,889
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member]
Debt Instrument [Line Items]
Principal Amount	624,793			0
Unamortized Discount and Debt Issuance Costs,	28,463			0
Long-term debt, net	$ 653,256			0
Maturity date	2021
Stated interest rate (percent)	4.625%
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member]
Debt Instrument [Line Items]
Principal Amount	$ 63,207	$ 624,793	$ 688,000	0
Unamortized Discount and Debt Issuance Costs,	3,036			0
Long-term debt, net	$ 66,243			0
Maturity date	2021
Stated interest rate (percent)	4.625%		4.625%
Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Principal Amount	$ 250,000			250,000
Unamortized Discount and Debt Issuance Costs,	(1,976)			(2,232)
Long-term debt, net	$ 248,024			247,768
Maturity date	2022
Stated interest rate (percent)	3.60%
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member]
Debt Instrument [Line Items]
Principal Amount	$ 433,793			0
Unamortized Discount and Debt Issuance Costs,	13,958			0
Long-term debt, net	$ 447,751			0
Maturity date	2023
Stated interest rate (percent)	4.875%	4.875%
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member]
Debt Instrument [Line Items]
Principal Amount	$ 16,207	$ 433,793	$ 450,000	0
Unamortized Discount and Debt Issuance Costs,	562			0
Long-term debt, net	$ 16,769			0
Maturity date	2023
Stated interest rate (percent)	4.875%
Senior Notes [Member] | 3.6% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Principal Amount	$ 750,000			0
Unamortized Discount and Debt Issuance Costs,	(10,918)			0
Long-term debt, net	$ 739,082			0
Maturity date	2026
Stated interest rate (percent)	3.60%
Senior Notes [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member]
Debt Instrument [Line Items]
Maturity date	2027
Senior Notes [Member] | 6 1/2% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Principal Amount	$ 100,000			100,000
Unamortized Discount and Debt Issuance Costs,	(934)			(989)
Long-term debt, net	$ 99,066			99,011
Maturity date	2029
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 6 3/4% Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Principal Amount	$ 250,000			250,000
Unamortized Discount and Debt Issuance Costs,	(1,913)			(2,002)
Long-term debt, net	$ 248,087			247,998
Maturity date	2032
Stated interest rate (percent)	6.75%
Senior Notes [Member] | 2035 GO Zone 6 1/2% Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 89,000			89,000
Unamortized Discount and Debt Issuance Costs,	(851)			(884)
Long-term debt, net	$ 88,149			88,116
Maturity date	2035
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 2035 IKE Zone 6 1/2% Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 65,000			65,000
Unamortized Discount and Debt Issuance Costs,	(610)			(634)
Long-term debt, net	$ 64,390			64,366
Maturity date	2035
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 5% Senior Notes Due 2046 [Member]
Debt Instrument [Line Items]
Principal Amount	$ 700,000			0
Unamortized Discount and Debt Issuance Costs,	(26,121)			0
Long-term debt, net	$ 673,879			$ 0
Maturity date	2046
Stated interest rate (percent)	5.00%

XML

Long-Term Debt (Revolving Credit Facility) (Details) - USD ($)	Sep. 30, 2016	Aug. 23, 2016	Jul. 21, 2016	Aug. 22, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Principal amount	$ 3,677,889,000				$ 764,889,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Term of revolving credit facility			5 years
Line of Credit [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Increase in credit facility borrowings		$ 25,000,000
Line of Credit [Member] | Maximum {Member]
Line of Credit Facility [Line Items]
Increase in credit facility borrowings		$ 500,000,000
Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,000,000,000
Revolving credit facility, amount outstanding	$ 325,000,000
Line of Credit Facility, Interest Rate at Period End	2.05%
Letters of credit outstanding	$ 76,581,000
Remaining borrowing capacity	$ 598,419,000
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage of commitment on borrowing availability	0.10%
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum {Member]
Line of Credit Facility [Line Items]
Percentage of commitment on borrowing availability	0.25%
Line of Credit [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	1.00%
Line of Credit [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum {Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	1.75%
Line of Credit [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.00%
Line of Credit [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum {Member]
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.75%
Line of Credit [Member] | Senior Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 400,000,000
Line of Credit [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			150,000,000
Line of Credit [Member] | Bridge Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 50,000,000

XML

Long-Term Debt (Senior Notes) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Aug. 10, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 3,677,889		$ 764,889
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 10,889		$ 10,889
Senior Notes [Member] | 3.60% Percentage Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Principal amount		$ 750,000
Stated interest rate (percent)		3.60%
Senior Notes [Member] | 5.0% Percentage Senior Notes Due 2046 [Member]
Debt Instrument [Line Items]
Principal amount		$ 700,000
Stated interest rate (percent)		5.00%

XML

Long-Term Debt (Exchange Offers) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 07, 2016	Sep. 06, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 3,677,889			$ 764,889
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	10,889			10,889
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member]
Debt Instrument [Line Items]
Principal amount	$ 63,207	$ 624,793	$ 688,000	0
Stated interest rate (percent)	4.625%		4.625%
Debt premium		33,540
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member]
Debt Instrument [Line Items]
Principal amount	$ 16,207	433,793	$ 450,000	0
Stated interest rate (percent)	4.875%
Debt premium		$ 15,750
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member]
Debt Instrument [Line Items]
Principal amount	$ 433,793			0
Stated interest rate (percent)	4.875%	4.875%
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member]
Debt Instrument [Line Items]
Principal amount	$ 624,793			$ 0
Stated interest rate (percent)	4.625%

XML

Long-Term Debt (Bridge Financing Agreement) (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
	Aug. 26, 2016	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Short-term Debt [Line Items]
Debt issuance costs			$ 35,207	$ 0
Expense structuring and other fees	$ 8,900		$ 1,018	$ 1,504
Axiall Corporation [Member]
Short-term Debt [Line Items]
Bridge facility		$ 1,765,000
Debt issuance costs		$ 9,700

XML

Pension and Post-Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 315	$ 0	$ 315	$ 29
Expected administrative expenses	730	0	730	0
Interest cost	2,191	487	1,553	1,519
Expected return on plan assets	(3,800)	(712)	(5,260)	(2,237)
Amortization of net loss	338	333	978	942
Net periodic benefit (income) cost	(226)	108	(1,684)	253
Non-US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	318	416	777	1,248
Expected administrative expenses	0	0	0	0
Interest cost	622	528	1,763	1,585
Expected return on plan assets	(50)	0	(50)	0
Amortization of net loss	0	263	0	789
Net periodic benefit (income) cost	890	1,207	2,490	3,622
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	72	6	81	17
Interest cost	250	149	540	448
Amortization of net loss	31	96	94	288
Net periodic benefit (income) cost	353	$ 251	715	$ 753
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1		1
Interest cost	3		3
Amortization of net loss	0		0
Net periodic benefit (income) cost	$ 4		$ 4

XML

Pension and Post-Retirement Benefits (Additional Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 0	$ 349
Non-US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year	$ 200

XML

Stockholders' Equity (Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			$ 3,561,931	$ 3,201,888
Net income	$ 70,014	$ 188,420	314,570	548,888
Pension and other post- retirement benefits liability			409	1,190
Foreign currency translation adjustments			15,758	(43,746)
Net unrealized holding gains on investments			4,999	124
Common stock repurchased			(66,725)	(122,249)
Shares issued—stock- based compensation			1,650	984
Stock-based compensation, net of tax on stock options exercised			7,778	9,996
Dividends paid			(71,933)	(67,852)
Distributions to noncontrolling interests			(12,300)	(10,982)
Noncontrolling interest in acquired business			68,000	1,597
Amount, ending balance	3,824,137	3,519,838	3,824,137	3,519,838
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			1,347	1,347
Shares issued—stock- based compensation			0	0
Amount, ending balance	1,347	1,347	1,347	1,347
Common Stock, Held in Treasury [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			(258,312)	(96,372)
Common stock repurchased			(66,725)	(122,249)
Shares issued—stock- based compensation			5,057	1,079
Amount, ending balance	(319,980)	(217,542)	(319,980)	(217,542)
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			542,148	530,441
Shares issued—stock- based compensation			(3,407)	(95)
Stock-based compensation, net of tax on stock options exercised			7,778	9,996
Amount, ending balance	546,519	540,342	546,519	540,342
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			3,109,987	2,555,528
Net income			299,914	535,041
Dividends paid			(71,933)	(67,852)
Amount, ending balance	3,337,968	3,022,717	3,337,968	3,022,717
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			(129,292)	(79,433)
Pension and other post- retirement benefits liability			409	1,190
Foreign currency translation adjustments			15,758	(43,746)
Net unrealized holding gains on investments			4,999	124
Amount, ending balance	(108,126)	(121,865)	(108,126)	(121,865)
Noncontrolling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount, beginning balance			296,053	290,377
Net income			14,656	13,847
Distributions to noncontrolling interests			(12,300)	(10,982)
Noncontrolling interest in acquired business			68,000	1,597
Amount, ending balance	$ 366,409	$ 294,839	$ 366,409	$ 294,839

XML

Stockholders' Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount, beginning balance			$ 3,561,931	$ 3,201,888
Other comprehensive (loss) income before reclassifications			73,056	(41,318)
Amounts reclassified from accumulated other comprehensive loss (income)	$ (51,477)	$ 451	(51,890)	(1,114)
Other comprehensive (loss) income	(26,025)	(1,941)	21,166	(42,432)
Amount, ending balance	3,824,137	3,519,838	3,824,137	3,519,838
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount, beginning balance			(129,292)	(79,433)
Amount, ending balance	(108,126)	(121,865)	(108,126)	(121,865)
Benefits Liability, Net of Tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount, beginning balance			(8,607)	(23,442)
Other comprehensive (loss) income before reclassifications			(252)	(128)
Amounts reclassified from accumulated other comprehensive loss (income)	228	451	661	1,318
Other comprehensive (loss) income			409	1,190
Amount, ending balance	(8,198)	(22,252)	(8,198)	(22,252)
Cumulative Foreign Currency Exchange, Net of Tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount, beginning balance			(115,690)	(56,224)
Other comprehensive (loss) income before reclassifications			15,758	(43,746)
Amounts reclassified from accumulated other comprehensive loss (income)			0	0
Other comprehensive (loss) income			15,758	(43,746)
Amount, ending balance	(99,932)	(99,970)	(99,932)	(99,970)
Net Unrealized Holdings Gains (Losses) on Investments, Net of Tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount, beginning balance			(4,995)	233
Other comprehensive (loss) income before reclassifications			57,550	2,556
Amounts reclassified from accumulated other comprehensive loss (income)			(52,551)	(2,432)
Other comprehensive (loss) income			4,999	124
Amount, ending balance	$ 4	$ 357	$ 4	$ 357

XML

Stockholders' Equity (Reclassifications in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes, investments	$ 6,552	$ (60,033)	$ (129,332)	$ (236,824)
Total reclassifications for the period	51,477	(451)	51,890	1,114
Benefits Liability, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassifications for the period	(228)	(451)	(661)	(1,318)
Net Unrealized Holdings Gains on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (loss), including portion attributable to noncontrolling interest	51,705	0	52,551	2,432
Total reclassifications for the period			52,551	2,432
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of pension and other post-retirement items, net loss	(369)	(692)	(1,072)	(2,019)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Benefits Liability, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes, defined benefit plan	141	241	411	701
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Holdings Gains on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income, net	52,401	0	53,720	3,795
Provision for income taxes, investments	$ (696)	$ 0	$ (1,169)	$ (1,363)

XML

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Aug. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,502	$ 2,639	$ 6,588	$ 7,544
Axiall Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	34,915		34,915
Axiall Corporation [Member] | Transaction and Integration Related Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 32,644		$ 32,644
Axiall Corporation [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in usd per share)					$ 33.00

XML

Derivative Instruments (Fair Values of Derivative Instruments in Consolidated Balance Sheets) (Details) - Not Designated as Hedging Instrument [Member] - Commodity Forward Contracts [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 5,895	$ 5,553
Fair value of derivative liabilities	10,007	21,762
Accounts receivable, net [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	2,221	3,465
Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	3,674	2,088
Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	3,196	9,325
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 6,811	$ 12,437

XML

Derivative Instruments (Impact of Derivative Instruments on Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Not Designated as Hedging Instrument [Member] | Commodity Forward Contracts [Member] | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ (7,840)	$ (9,314)	$ 7,784	$ (4,478)

XML

Derivative Instruments Derivative Commodity Instruments (Offsetting Asset) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Offsetting Assets [Line Items]
Derivative assets subject to enforceable master netting arrangements	$ 0	$ 0
Derivative assets not subject to enforceable master netting arrangements	3,560	462
Total derivative assets	3,560	462
Commodity Forward Contracts [Member]
Offsetting Assets [Line Items]
Derivative assets subject to enforceable master netting arrangements	0	0
Gross amounts of recognized assets	2,335	5,091
Gross amount offset in the consolidated balance sheet	$ (2,335)	$ (5,091)

XML

Derivative Instruments Derivative Commodity Instruments (Offsetting Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Offsetting Liabilities [Line Items]
Derivative liabilities not subject to enforceable master netting arrangements	$ 5,782	$ 10,868
Gross amounts not offset in the consolidated balance sheet	1,889	5,803
Total derivative liabilities	7,671	16,671
Commodity Forward Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts not offset in the consolidated balance sheet	0	0
Gross amounts of recognized liabilities	4,224	10,894
Total derivative liabilities	1,889	5,803
Gross amounts offset in the consolidated balance sheet	(2,335)	(5,091)
Derivative liability, net amount offset against collateral	1,889	5,803
Counterparty A [Member] | Commodity Forward Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts not offset in the consolidated balance sheet	0	0
Total derivative liabilities	1,889	5,564
Derivative liability, net amount offset against collateral	1,889	5,564
Counterparty B [Member] | Commodity Forward Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts not offset in the consolidated balance sheet	0	0
Total derivative liabilities	0	239
Derivative liability, net amount offset against collateral	$ 0	$ 239

XML

Fair Value Measurements (Summary of Assets and Liabilities Accounted at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 568,225
Commodity Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	$ 2,335	5,091
Risk management liabilities - Commodity forward contracts	(4,224)	(10,894)
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		568,225
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		48,081
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		520,144
Recurring [Member] | Commodity Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	5,895	5,553
Risk management liabilities - Commodity forward contracts	(10,007)	(21,762)
Recurring [Member] | Commodity Forward Contracts [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	1,551	5,553
Risk management liabilities - Commodity forward contracts	(8,091)	(11,648)
Recurring [Member] | Commodity Forward Contracts [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	4,344	0
Risk management liabilities - Commodity forward contracts	$ (1,916)	$ (10,114)

XML

Fair Value Measurements (Summary of Carrying and Fair Values of Long Term Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 07, 2016	Sep. 06, 2016	Dec. 31, 2015
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2021
Stated interest rate (percent)	4.625%
Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2021
Stated interest rate (percent)	4.625%		4.625%
Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2022
Stated interest rate (percent)	3.60%
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2023
Stated interest rate (percent)	4.875%	4.875%
Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2023
Stated interest rate (percent)	4.875%
Senior Notes [Member] | 3.6% Senior Notes Due 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2026
Stated interest rate (percent)	3.60%
Senior Notes [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2027
Senior Notes [Member] | 6 1/2% Senior Notes Due 2029 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2029
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 6 3/4% Senior Notes Due 2032 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2032
Stated interest rate (percent)	6.75%
Senior Notes [Member] | 2035 GO Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2035
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 2035 IKE Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2035
Stated interest rate (percent)	6.50%
Senior Notes [Member] | 5% Senior Notes Due 2046 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity date	2046
Stated interest rate (percent)	5.00%
Carrying Value [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 10,889			$ 10,889
Carrying Value [Member] | Line of Credit [Member] | Unsecured Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility	325,000			0
Carrying Value [Member] | Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	653,256			0
Carrying Value [Member] | Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	66,243			0
Carrying Value [Member] | Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	248,024			247,768
Carrying Value [Member] | Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	447,751			0
Carrying Value [Member] | Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	16,769			0
Carrying Value [Member] | Senior Notes [Member] | 3.6% Senior Notes Due 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	739,082			0
Carrying Value [Member] | Senior Notes [Member] | 6 1/2% Senior Notes Due 2029 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	99,066			99,011
Carrying Value [Member] | Senior Notes [Member] | 6 3/4% Senior Notes Due 2032 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	248,087			247,998
Carrying Value [Member] | Senior Notes [Member] | 2035 GO Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	88,149			88,116
Carrying Value [Member] | Senior Notes [Member] | 2035 IKE Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	64,390			64,366
Carrying Value [Member] | Senior Notes [Member] | 5% Senior Notes Due 2046 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	673,879			0
Fair Value [Member] | Loan related to tax-exempt waste disposal revenue bonds due 2027 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	10,889			10,889
Fair Value [Member] | Line of Credit [Member] | Unsecured Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility	325,000			0
Fair Value [Member] | Senior Notes [Member] | 4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	653,715			0
Fair Value [Member] | Senior Notes [Member] | 4.625% Senior Notes Due 2021 (Existing Axiall 2021 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	66,058			0
Fair Value [Member] | Senior Notes [Member] | 3.60% Senior Notes Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	251,480			244,828
Fair Value [Member] | Senior Notes [Member] | 4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	454,151			0
Fair Value [Member] | Senior Notes [Member] | 4.875% Senior Notes Due 2023 (Existing Axiall 2023 Notes) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	16,954			0
Fair Value [Member] | Senior Notes [Member] | 3.6% Senior Notes Due 2026 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	752,055			0
Fair Value [Member] | Senior Notes [Member] | 6 1/2% Senior Notes Due 2029 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	117,726			117,153
Fair Value [Member] | Senior Notes [Member] | 6 3/4% Senior Notes Due 2032 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	265,383			268,490
Fair Value [Member] | Senior Notes [Member] | 2035 GO Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	105,298			106,491
Fair Value [Member] | Senior Notes [Member] | 2035 IKE Zone 6 1/2% Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	76,837			76,741
Fair Value [Member] | Senior Notes [Member] | 5% Senior Notes Due 2046 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 705,985			$ 0

XML

Income Taxes (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	(10.30%)	24.20%	29.10%	30.10%
U.S. federal statutory income tax rate			35.00%	35.00%
Unrecognized tax benefits	$ 8,818		$ 8,818			$ 0
Accrued interest and penalties on tax	$ 206		$ 206
Scenario, Forecast [Member]
Income Tax Examination [Line Items]
Undistributed earnings of foreign subsidiaries					$ 204,154
Unremitted foreign earnings income tax expense					32,272
Deferred tax liability					1,837
Scenario, Forecast [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Deferred tax liability					1,169
Scenario, Forecast [Member] | Taiwan [Member]
Income Tax Examination [Line Items]
Deferred tax liability					$ 668

XML

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2016 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 0
Amounts attributable to Axiall pre-acquistion	5,471
Additions during the three months ended September 30, 2016	3,444
Reduction during the three months ended September 30, 2016 due to expiration of statute of limitations	(92)
Foreign currency translation	(5)
Ending Balance	$ 8,818

XML

Earnings per Share (Schedule of Net Income Attributable to Common Stockholders) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income attributable to Westlake Chemical Corporation	$ 65,662	$ 183,604	$ 299,914	$ 535,041
Less: Net income attributable to participating securities	(294)	(195)	(1,347)	(653)
Net income attributable to common shareholders	$ 65,368	$ 183,409	$ 298,567	$ 534,388

XML

Earnings per Share (Reconciliation of Denominator for Basic and Diluted Earnings Per Share) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted average common shares—basic	128,793,661	131,664,296	129,519,577	132,301,814
Incremental shares from assumed exercise of options	586,295	456,939	584,320	484,720
Weighted average common shares-diluted	129,379,956	132,121,235	130,103,897	132,786,534
Earnings per share: Basic (usd per share)	$ 0.51	$ 1.39	$ 2.31	$ 4.04
Earnings per share: Diluted (usd per share)	$ 0.51	$ 1.39	$ 2.29	$ 4.02

XML

Earnings per Share (Additional Information) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Number of options excluded from computation of diluted earnings per share	620,010	315,285	577,254	295,825

XML

Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued liabilities	$ 552,581		$ 552,581		$ 287,313
Accrued rebates	73,798		73,798		$ 46,460
Other Income, Net [Abstract]
Interest income	537	$ 1,631	6,899	$ 3,383
Dividend income	868	0	5,142	3,328
Acquisition-related financing costs	(11,420)	0	(12,220)	0
Foreign exchange currency (losses) gains, net	(1,281)	(731)	(2,435)	1,140
Impairment of equity method investment	0	0	0	(4,925)
Gain realized on previously held shares of Axiall common stock	49,080	0	49,080	0
Gain on acquisition and related expenses, net	0	0	0	20,430
Gain from sales of equity securities	3,321	0	4,640	3,795
Other	160	1,736	985	6,639
Other income, net	$ 41,265	$ 2,636	$ 52,091	$ 33,790

XML

Insurance Recovery (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Insurance Recovery [Abstract]
Insurance recovery	$ 2,670	$ 7,809

XML

Commitments and Contingencies (Additional Information) (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) settlement	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual	$ 60,693	$ 1,095
Settled Litigation [Member]
Loss Contingencies [Line Items]
Payments for environmental loss contingencies			$ 449
Number of claims settled | settlement	2
Amount of settlement for compliance violations	$ 192
Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought	167
LDEQ [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought	$ 100
Axiall Corporation [Member] | Settled Litigation [Member]
Loss Contingencies [Line Items]
Amount of settlement for compliance violations		$ 900

XML

Segment Information (Additional Information) (Detail)	9 Months Ended
	Sep. 30, 2016 Segment
Segment Reporting [Abstract]
Number of segments	2

XML

Segment Information (Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net external sales	$ 1,279,028	$ 1,188,037	$ 3,340,276	$ 3,476,570
Income (loss) from operations	46,563	254,028	428,777	778,682
Depreciation and amortization	94,229	61,248	227,193	180,229
Other income (expense), net	41,265	2,636	52,091	33,790
Provision for (benefit from) income taxes	(6,552)	60,033	129,332	236,824
Capital expenditures	180,170	125,304	467,330	329,236
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net external sales	1,279,028	1,188,037	3,340,276	3,476,570
Capital expenditures	178	1,909	1,579	7,582
Operating Segments [Member] | Olefins [Member]
Segment Reporting Information [Line Items]
Net external sales	497,365	588,097	1,422,869	1,792,052
Income (loss) from operations	118,475	196,703	408,274	608,744
Depreciation and amortization	36,649	27,678	95,582	82,240
Other income (expense), net	1,101	1,323	3,706	3,770
Provision for (benefit from) income taxes	31,956	45,865	136,429	186,534
Capital expenditures	96,469	69,885	285,359	206,719
Operating Segments [Member] | Vinyls [Member]
Segment Reporting Information [Line Items]
Net external sales	781,663	599,940	1,917,407	1,684,518
Income (loss) from operations	22,235	67,779	136,559	202,831
Depreciation and amortization	56,136	33,432	128,691	97,615
Other income (expense), net	(1,226)	10	1,722	6,927
Provision for (benefit from) income taxes	(3,912)	15,812	29,655	55,270
Capital expenditures	83,523	53,510	180,392	114,935
Operating Segments [Member] | Polyethylene [Member] | Olefins [Member]
Segment Reporting Information [Line Items]
Net external sales	380,810	423,631	1,098,500	1,283,545
Operating Segments [Member] | Ethylene, Styrene And Other [Member] | Olefins [Member]
Segment Reporting Information [Line Items]
Net external sales	116,555	164,466	324,369	508,507
Operating Segments [Member] | PVC, Caustic Soda And Other [Member] | Vinyls [Member]
Segment Reporting Information [Line Items]
Net external sales	599,276	468,235	1,492,650	1,315,101
Operating Segments [Member] | Building Products [Member] | Vinyls [Member]
Segment Reporting Information [Line Items]
Net external sales	182,387	131,705	424,757	369,417
Corporate and other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(94,147)	(10,454)	(116,056)	(32,893)
Depreciation and amortization	1,444	138	2,920	374
Other income (expense), net	41,390	1,303	46,663	23,093
Provision for (benefit from) income taxes	(34,596)	(1,644)	(36,752)	(4,980)
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Net external sales	32,744	28,892	88,575	79,752
Intersegment sales [Member] | Olefins [Member]
Segment Reporting Information [Line Items]
Net external sales	30,614	28,551	85,856	78,654
Intersegment sales [Member] | Vinyls [Member]
Segment Reporting Information [Line Items]
Net external sales	$ 2,130	$ 341	$ 2,719	$ 1,098

XML

Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting [Abstract]
Income from operations	$ 46,563	$ 254,028	$ 428,777	$ 778,682
Interest expense	(24,366)	(8,211)	(36,966)	(26,760)
Other income, net	41,265	2,636	52,091	33,790
Income before income taxes	$ 63,462	$ 248,453	$ 443,902	$ 785,712

XML

Segment Information (Total Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 10,897,049	$ 5,569,285
Operating Segments [Member] | Olefins [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,094,163	1,869,888
Operating Segments [Member] | Vinyls [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	8,262,971	2,638,833
Corporate and other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 539,915	$ 1,060,564

XML

Pending Acquisition (Details) - Axiall Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands	Aug. 31, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Offer price per share (usd per share)	$ 33.00
Transaction value	$ 1,833,236
Bridge facility		$ 1,765,000

XML

Guarantor Disclosures (Additional Information) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Condensed Financial Statements, Captions [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
3.60% Senior Notes Due 2022 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate (percent)	3.60%
Maturity date	2022
Minimum debt amount guaranteed by subsidiaries	$ 5,000

XML

Guarantor Disclosures (Condensed Consolidating Financial Information Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 380,519	$ 662,525	$ 961,925	$ 880,601
Marketable securities	0	520,144
Accounts receivable, net	1,070,501	508,532
Inventories	744,536	434,060
Prepaid expenses and other current assets	54,868	14,489
Restricted cash	169,320
Deferred income taxes	0	35,439
Total current assets	2,419,744	2,175,189
Property, plant and equipment, net	6,450,947	3,004,067
Other assets, net	2,026,358	390,029
Total assets	10,897,049	5,569,285
Accounts payable		235,329
Accounts and notes payable	503,388	235,329
Accrued liabilities	552,581	287,313
Term loan	148,681	0
Total current liabilities	1,204,650	522,642
Long-term debt, net	3,680,585	758,148
Deferred income taxes	1,607,084	575,603
Pension and other liabilities	580,593	150,961
Total liabilities	7,072,912	2,007,354
Total Westlake Chemical Corporation stockholders' equity	3,457,728	3,265,878
Noncontrolling interests	366,409	296,053
Total equity	3,824,137	3,561,931	3,519,838	3,201,888
Total liabilities and equity	10,897,049	5,569,285
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Marketable securities		0
Accounts receivable, net	(2,535,822)	(2,167,758)
Inventories	0	0
Prepaid expenses and other current assets	(13,394)	(2,879)
Restricted cash	0
Deferred income taxes		0
Total current assets	(2,549,216)	(2,170,637)
Property, plant and equipment, net	0	0
Other assets, net	(9,163,010)	(6,970,326)
Total assets	(11,712,226)	(9,140,963)
Accounts payable		(2,143,033)
Accounts and notes payable	(2,524,315)
Accrued liabilities	(24,901)	(27,604)
Term loan	0
Total current liabilities	(2,549,216)	(2,170,637)
Long-term debt, net	(2,881,906)	(733,516)
Deferred income taxes	(12,070)	(6,567)
Pension and other liabilities	0	0
Total liabilities	(5,443,192)	(2,910,720)
Total Westlake Chemical Corporation stockholders' equity	(6,269,034)	(6,230,243)
Noncontrolling interests	0	0
Total equity	(6,269,034)	(6,230,243)
Total liabilities and equity	(11,712,226)	(9,140,963)
Westlake Chemical Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	144,899	303,131	647,646	655,947
Marketable securities		520,144
Accounts receivable, net	1,457	10,943
Inventories	0	0
Prepaid expenses and other current assets	8,257	2,201
Restricted cash	0
Deferred income taxes		702
Total current assets	154,613	837,121
Property, plant and equipment, net	0	0
Other assets, net	9,074,810	5,003,096
Total assets	9,229,423	5,840,217
Accounts payable		1,817,963
Accounts and notes payable	2,172,989
Accrued liabilities	12,022	9,117
Term loan	0
Total current liabilities	2,185,011	1,827,080
Long-term debt, net	3,586,684	747,259
Deferred income taxes	0	0
Pension and other liabilities	0	0
Total liabilities	5,771,695	2,574,339
Total Westlake Chemical Corporation stockholders' equity	3,457,728	3,265,878
Noncontrolling interests	0	0
Total equity	3,457,728	3,265,878
Total liabilities and equity	9,229,423	5,840,217
100% Owned Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	1,884	6,818	5,435	3,047
Marketable securities		0
Accounts receivable, net	2,838,917	2,474,963
Inventories	329,233	287,114
Prepaid expenses and other current assets	16,264	10,186
Restricted cash	0
Deferred income taxes		28,325
Total current assets	3,186,298	2,807,406
Property, plant and equipment, net	1,538,148	1,476,642
Other assets, net	418,588	914,823
Total assets	5,143,034	5,198,871
Accounts payable		374,468
Accounts and notes payable	466,907
Accrued liabilities	162,645	163,167
Term loan	0
Total current liabilities	629,552	537,635
Long-term debt, net	775,995	744,405
Deferred income taxes	596,928	513,692
Pension and other liabilities	48,837	49,202
Total liabilities	2,051,312	1,844,934
Total Westlake Chemical Corporation stockholders' equity	3,091,722	3,353,937
Noncontrolling interests	0	0
Total equity	3,091,722	3,353,937
Total liabilities and equity	5,143,034	5,198,871
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	233,736	352,576	$ 308,844	$ 221,607
Marketable securities		0
Accounts receivable, net	765,949	190,384
Inventories	415,303	146,946
Prepaid expenses and other current assets	43,741	4,981
Restricted cash	169,320
Deferred income taxes		6,412
Total current assets	1,628,049	701,299
Property, plant and equipment, net	4,912,799	1,527,425
Other assets, net	1,695,970	1,442,436
Total assets	8,236,818	3,671,160
Accounts payable		185,931
Accounts and notes payable	387,807
Accrued liabilities	402,815	142,633
Term loan	148,681
Total current liabilities	939,303	328,564
Long-term debt, net	2,199,812	0
Deferred income taxes	1,022,226	68,478
Pension and other liabilities	531,756	101,759
Total liabilities	4,693,097	498,801
Total Westlake Chemical Corporation stockholders' equity	3,177,312	2,876,306
Noncontrolling interests	366,409	296,053
Total equity	3,543,721	3,172,359
Total liabilities and equity	$ 8,236,818	$ 3,671,160

XML

Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 1,279,028	$ 1,188,037	$ 3,340,276	$ 3,476,570
Cost of sales	1,076,895	876,761	2,641,192	2,527,567
Gross profit	202,133	311,276	699,084	949,003
Selling, general and administrative expenses	72,729	57,248	179,757	170,321
Transaction and integration-related costs	82,841	0	90,550	0
Income from operations	46,563	254,028	428,777	778,682
Interest expense	(24,366)	(8,211)	(36,966)	(26,760)
Other income, net	41,265	2,636	52,091	33,790
Income before income taxes	63,462	248,453	443,902	785,712
(Benefit from) provision for income taxes	(6,552)	60,033	129,332	236,824
Equity in net income of subsidiaries	0	0	0	0
Net income	70,014	188,420	314,570	548,888
Net income attributable to noncontrolling interests	4,352	4,816	14,656	13,847
Net income attributable to Westlake Chemical Corporation	65,662	183,604	299,914	535,041
Comprehensive income attributable to Westlake Chemical Corporation	39,637	181,663	321,080	492,609
Westlake Chemical Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	2,092	804	3,648	1,617
Transaction and integration-related costs	0		0
Income from operations	(2,092)	(804)	(3,648)	(1,617)
Interest expense	(22,130)	(10,405)	(43,228)	(31,726)
Other income, net	35,405	1,239	40,807	17,627
Income before income taxes	11,183	(9,970)	(6,069)	(15,716)
(Benefit from) provision for income taxes	(2,088)	(3,249)	(8,268)	(5,226)
Equity in net income of subsidiaries	52,391	190,325	297,715	545,531
Net income	65,662	183,604	299,914	535,041
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Westlake Chemical Corporation	65,662	183,604	299,914	535,041
Comprehensive income attributable to Westlake Chemical Corporation	39,637	181,663	321,080	492,609
100% Owned Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	775,474	901,006	2,357,769	2,677,773
Cost of sales	677,085	712,681	2,018,282	2,078,730
Gross profit	98,389	188,325	339,487	599,043
Selling, general and administrative expenses	31,180	37,156	104,488	115,400
Transaction and integration-related costs	35,379		43,088
Income from operations	31,830	151,169	191,911	483,643
Interest expense	(10,247)	(5,711)	(19,051)	(18,353)
Other income, net	(8,622)	203	(12,057)	(4,743)
Income before income taxes	12,961	145,661	160,803	460,547
(Benefit from) provision for income taxes	18,987	53,131	136,856	222,743
Equity in net income of subsidiaries	0	0	0	0
Net income	(6,026)	92,530	23,947	237,804
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Westlake Chemical Corporation	(6,026)	92,530	23,947	237,804
Comprehensive income attributable to Westlake Chemical Corporation	(5,923)	92,781	24,356	238,433
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	823,238	596,860	1,945,866	1,727,561
Cost of sales	714,365	469,137	1,570,669	1,362,710
Gross profit	108,873	127,723	375,197	364,851
Selling, general and administrative expenses	44,586	24,060	87,221	68,195
Transaction and integration-related costs	47,462		47,462
Income from operations	16,825	103,663	240,514	296,656
Interest expense	(9,117)	0	(9,117)	0
Other income, net	31,610	9,099	57,771	44,225
Income before income taxes	39,318	112,762	289,168	340,881
(Benefit from) provision for income taxes	(23,451)	10,151	744	19,307
Equity in net income of subsidiaries	0	0	0	0
Net income	62,769	102,611	288,424	321,574
Net income attributable to noncontrolling interests	4,352	4,816	14,656	13,847
Net income attributable to Westlake Chemical Corporation	58,417	97,795	273,768	307,727
Comprehensive income attributable to Westlake Chemical Corporation	45,945	96,062	293,859	264,542
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	(319,684)	(309,829)	(963,359)	(928,764)
Cost of sales	(314,555)	(305,057)	(947,759)	(913,873)
Gross profit	(5,129)	(4,772)	(15,600)	(14,891)
Selling, general and administrative expenses	(5,129)	(4,772)	(15,600)	(14,891)
Transaction and integration-related costs	0		0
Income from operations	0	0	0	0
Interest expense	17,128	7,905	34,430	23,319
Other income, net	(17,128)	(7,905)	(34,430)	(23,319)
Income before income taxes	0	0	0	0
(Benefit from) provision for income taxes	0	0	0	0
Equity in net income of subsidiaries	(52,391)	(190,325)	(297,715)	(545,531)
Net income	(52,391)	(190,325)	(297,715)	(545,531)
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Westlake Chemical Corporation	(52,391)	(190,325)	(297,715)	(545,531)
Comprehensive income attributable to Westlake Chemical Corporation	$ (40,022)	$ (188,843)	$ (318,215)	$ (502,975)

XML

Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net income	$ 70,014	$ 188,420	$ 314,570	$ 548,888
Depreciation and amortization			228,211	181,733
Deferred income taxes			105,910	7,585
Net changes in working capital and other			(104,531)	103,094
Net cash provided by operating activities			544,160	841,300
Acquisition of business, net of cash acquired			(2,437,829)	15,782
Additions to cost method investment			(4,000)	0
Additions to property, plant and equipment	(180,170)	(125,304)	(467,330)	(329,236)
Proceeds from disposition of assets			213	17
Proceeds from disposition of equity method investment			0	27,865
Proceeds from sales and maturities of securities			662,938	16,056
Purchase of securities			(138,422)	(282,542)
Settlements of derivative instruments			(4,655)	(1,535)
Net cash used for investing activities			(2,389,085)	(553,593)
Intercompany financing			0	0
Debt issuance costs			(35,207)	0
Dividends paid			(71,933)	(67,852)
Distributions to noncontrolling interests			(12,300)	(10,982)
Proceeds from debt issuance			(1,428,512)	0
Proceeds from exercise of stock options			1,650	984
Proceeds from issuance of notes payable			5,597	19,483
Proceeds from term loan and drawdown of revolver			600,000	0
Restricted cash associated with term loan			(154,000)	0
Repayment of notes payable			(10,602)	(32,954)
Repayment of revolver			(125,000)	0
Repurchase of common stock for treasury			(67,406)	(114,254)
Windfall tax benefits from share-based payment arrangements			1,190	2,452
Net cash provided by (used for) financing activities			1,560,501	(203,123)
Effect of exchange rate changes on cash and cash equivalents			2,418	(3,260)
Net (decrease) increase in cash and cash equivalents			(282,006)	81,324
Cash and cash equivalents at beginning of period			662,525	880,601
Cash and cash equivalents at end of period	380,519	961,925	380,519	961,925
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(52,391)	(190,325)	(297,715)	(545,531)
Depreciation and amortization			0	0
Deferred income taxes			0	0
Net changes in working capital and other			297,715	545,531
Net cash provided by operating activities			0	0
Acquisition of business, net of cash acquired			0	0
Additions to cost method investment			0
Additions to property, plant and equipment			0	0
Proceeds from disposition of assets			0	0
Proceeds from disposition of equity method investment				0
Proceeds from sales and maturities of securities			0	0
Purchase of securities			0	0
Settlements of derivative instruments			0	0
Net cash used for investing activities			0	0
Intercompany financing			0	0
Debt issuance costs			0
Dividends paid			0	0
Distributions to noncontrolling interests			0	0
Proceeds from exercise of stock options			0	0
Proceeds from issuance of notes payable			0	0
Proceeds from term loan and drawdown of revolver			0
Restricted cash associated with term loan			0
Repayment of notes payable			0	0
Repayment of revolver			0
Repurchase of common stock for treasury			0	0
Windfall tax benefits from share-based payment arrangements			0	0
Net cash provided by (used for) financing activities			0	0
Effect of exchange rate changes on cash and cash equivalents			0	0
Net (decrease) increase in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Westlake Chemical Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	65,662	183,604	299,914	535,041
Depreciation and amortization			747	1,504
Deferred income taxes			(5,178)	87
Net changes in working capital and other			(314,423)	(567,137)
Net cash provided by operating activities			(18,940)	(30,505)
Acquisition of business, net of cash acquired			0	0
Additions to cost method investment			0
Additions to property, plant and equipment			0	0
Proceeds from disposition of assets			0	0
Proceeds from disposition of equity method investment				0
Proceeds from sales and maturities of securities			658,338	16,056
Purchase of securities			(138,422)	(282,542)
Settlements of derivative instruments			0	0
Net cash used for investing activities			519,916	(266,486)
Intercompany financing			(2,242,604)	467,360
Debt issuance costs			(33,617)
Dividends paid			(71,933)	(67,852)
Distributions to noncontrolling interests			0	0
Proceeds from debt issuance			(1,428,512)
Proceeds from exercise of stock options			1,650	984
Proceeds from issuance of notes payable			0	0
Proceeds from term loan and drawdown of revolver			450,000
Restricted cash associated with term loan			0
Repayment of notes payable			0	0
Repayment of revolver			(125,000)
Repurchase of common stock for treasury			(67,406)	(114,254)
Windfall tax benefits from share-based payment arrangements			1,190	2,452
Net cash provided by (used for) financing activities			(659,208)	288,690
Effect of exchange rate changes on cash and cash equivalents			0	0
Net (decrease) increase in cash and cash equivalents			(158,232)	(8,301)
Cash and cash equivalents at beginning of period			303,131	655,947
Cash and cash equivalents at end of period	144,899	647,646	144,899	647,646
100% Owned Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(6,026)	92,530	23,947	237,804
Depreciation and amortization			98,658	81,770
Deferred income taxes			111,795	3,972
Net changes in working capital and other			93,280	110,574
Net cash provided by operating activities			327,680	434,120
Acquisition of business, net of cash acquired			0	0
Additions to cost method investment			0
Additions to property, plant and equipment			(163,579)	(137,844)
Proceeds from disposition of assets			48	0
Proceeds from disposition of equity method investment				27,865
Proceeds from sales and maturities of securities			0	0
Purchase of securities			0	0
Settlements of derivative instruments			(4,655)	(1,535)
Net cash used for investing activities			(168,186)	(111,514)
Intercompany financing			(366,639)	(570,217)
Debt issuance costs			0
Dividends paid			0	0
Distributions to noncontrolling interests			202,211	249,999
Proceeds from exercise of stock options			0	0
Proceeds from issuance of notes payable			0	0
Proceeds from term loan and drawdown of revolver			0
Restricted cash associated with term loan			0
Repayment of notes payable			0	0
Repayment of revolver			0
Repurchase of common stock for treasury			0	0
Windfall tax benefits from share-based payment arrangements			0	0
Net cash provided by (used for) financing activities			(164,428)	(320,218)
Effect of exchange rate changes on cash and cash equivalents			0	0
Net (decrease) increase in cash and cash equivalents			(4,934)	2,388
Cash and cash equivalents at beginning of period			6,818	3,047
Cash and cash equivalents at end of period	1,884	5,435	1,884	5,435
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	62,769	102,611	288,424	321,574
Depreciation and amortization			128,806	98,459
Deferred income taxes			(707)	3,526
Net changes in working capital and other			(181,103)	14,126
Net cash provided by operating activities			235,420	437,685
Acquisition of business, net of cash acquired			(2,437,829)	15,782
Additions to cost method investment			(4,000)
Additions to property, plant and equipment			(303,751)	(191,392)
Proceeds from disposition of assets			165	17
Proceeds from disposition of equity method investment				0
Proceeds from sales and maturities of securities			4,600	0
Purchase of securities			0	0
Settlements of derivative instruments			0	0
Net cash used for investing activities			(2,740,815)	(175,593)
Intercompany financing			2,609,243	102,857
Debt issuance costs			(1,590)
Dividends paid			0	0
Distributions to noncontrolling interests			(214,511)	(260,981)
Proceeds from exercise of stock options			0	0
Proceeds from issuance of notes payable			5,597	19,483
Proceeds from term loan and drawdown of revolver			150,000
Restricted cash associated with term loan			(154,000)
Repayment of notes payable			(10,602)	(32,954)
Repayment of revolver			0
Repurchase of common stock for treasury			0	0
Windfall tax benefits from share-based payment arrangements			0	0
Net cash provided by (used for) financing activities			2,384,137	(171,595)
Effect of exchange rate changes on cash and cash equivalents			2,418	(3,260)
Net (decrease) increase in cash and cash equivalents			(118,840)	87,237
Cash and cash equivalents at beginning of period			352,576	221,607
Cash and cash equivalents at end of period	$ 233,736	$ 308,844	$ 233,736	$ 308,844