WLK

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 24, 2026

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On February 24, 2026, Westlake Corporation (the "Company") issued a press release announcing its 2025 fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on February 24, 2026 to discuss its 2025 fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2025 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on February 24, 2026. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:February 24, 2026By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President, Chief Executive Officer and Director

wlk-20251030false000126282300012628232025-10-302025-10-300001262823us-gaap:CommonStockMember2025-10-302025-10-300001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2025-10-302025-10-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 30, 2025

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On October 30, 2025, Westlake Corporation (the "Company"), issued a press release announcing its 2025 third quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on October 30, 2025 to discuss its 2025 third quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2025 third quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on October 30, 2025. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:October 30, 2025By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20250805false000126282300012628232025-08-052025-08-050001262823us-gaap:CommonStockMember2025-08-052025-08-050001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2025-08-052025-08-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 5, 2025

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On August 5, 2025, Westlake Corporation (the "Company"), issued a press release announcing its 2025 second quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on August 5, 2025 to discuss its 2025 second quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2025 second quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on August 5, 2025. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:August 5, 2025By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20250502false000126282300012628232025-05-022025-05-020001262823us-gaap:CommonStockMember2025-05-022025-05-020001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2025-05-022025-05-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 2, 2025

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On May 2, 2025, Westlake Corporation (the "Company"), issued a press release announcing its 2025 first quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on May 2, 2025 to discuss its 2025 first quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2025 first quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on May 2, 2025. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:May 2, 2025By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20250224false000126282300012628232025-02-242025-02-240001262823us-gaap:CommonStockMember2025-02-242025-02-240001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2025-02-242025-02-24

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 24, 2025

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On February 24, 2025, Westlake Corporation (the "Company") issued a press release announcing its 2024 fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on February 24, 2025 to discuss its 2024 fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2024 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on February 24, 2025. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:February 24, 2025By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20241105false000126282300012628232024-11-052024-11-050001262823us-gaap:CommonStockMember2024-11-052024-11-050001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2024-11-052024-11-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 5, 2024

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On November 5, 2024, Westlake Corporation (the "Company"), issued a press release announcing its 2024 third quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on November 5, 2024 to discuss its 2024 third quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2024 third quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on November 5, 2024. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:November 5, 2024By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20240806false000126282300012628232024-08-062024-08-060001262823us-gaap:CommonStockMember2024-08-062024-08-060001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2024-08-062024-08-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 6, 2024

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On August 6, 2024, Westlake Corporation (the "Company"), issued a press release announcing its 2024 second quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on August 6, 2024 to discuss its 2024 second quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2024 second quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on August 6, 2024. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:August 6, 2024By:/S/ JEAN-MARC GILSON

Jean-Marc Gilson

President and Chief Executive Officer

wlk-20240501false000126282300012628232024-05-012024-05-010001262823us-gaap:CommonStockMember2024-05-012024-05-010001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2024-05-012024-05-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 1, 2024

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On May 1, 2024, Westlake Corporation (the "Company"), issued a press release announcing its 2024 first quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on May 1, 2024 to discuss its 2024 first quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2024 first quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on May 1, 2024. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:May 1, 2024By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20240220false000126282300012628232024-02-202024-02-200001262823us-gaap:CommonStockMember2024-02-202024-02-200001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2024-02-202024-02-20

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 20, 2024

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On February 20, 2024, Westlake Corporation (the "Company") issued a press release announcing its 2023 fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on February 20, 2024 to discuss its 2023 fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2023 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on February 20, 2024. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:February 20, 2024By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20240206false000126282300012628232024-02-062024-02-060001262823us-gaap:CommonStockMember2024-02-062024-02-060001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2024-02-062024-02-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 6, 2024

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common StockWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. As previously disclosed, Westlake Corporation (the “Company”) was involved in lawsuits relating to the September 2021 flash fire at the quench tower of its Petro 2 facility (the “Petro 2 Flash Fire”) and the January 2022 ethylene dichloride storage tank explosion at one of its Lake Charles, Louisiana complexes (the “EDC Storage Tank Explosion”). Settlements have been reached to fully resolve the lawsuits relating to the Petro 2 Flash Fire and the EDC Storage Tank Explosion. The settlements totaling approximately $382 million in the aggregate were reached with all of the plaintiffs to resolve the lawsuits, but payment by the Company and the insurance carriers has not yet been completed. Certain of the Company’s excess insurers have taken the position that there has been insufficient exhaustion of the retention levels beneath their respective attachment points to obligate them to cover these events. As a result, approximately $150 million of the $382 million total final settlement amount is currently not being covered by the insurers. The Company disagrees with the insurers’ coverage position, and is pursuing recovery of the approximately $150 million and any other amount that it may be entitled to. As a result, the Company expects to record a charge of approximately $150 million in the fourth quarter of 2023 to reflect the portion of the $382 million total settlement amount that is currently subject to dispute with the insurers. The information furnished pursuant to this Current Report on Form 8-K shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by the Company under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein.

Forward-Looking Statements

The statements in this Current Report on Form 8-K that are not historical facts, including statements regarding the applicability of insurance coverage and the likelihood of recovery, are forward-looking statements within the meaning of the U.S. securities laws. These forward-looking statements are subject to significant risks and uncertainties, many of which are beyond the Company’s control. Actual results could differ materially, based on factors including, but not limited to: the willingness and ability of the insurance carriers to provide coverage; legal challenges involving the relevant insurance policies; and other risks and uncertainties. For more detailed information about the factors that could cause actual results to differ materially, please refer to Westlake’s Annual Report on Form 10-K for the year ended December 31, 2022, which was filed with the SEC in February 2023, a

wlk-20231102false000126282300012628232023-11-022023-11-020001262823us-gaap:CommonStockMember2023-11-022023-11-020001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2023-11-022023-11-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 2, 2023

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On November 2, 2023, Westlake Corporation (the "Company"), issued a press release announcing its 2023 third quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on November 2, 2023 to discuss its 2023 third quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2023 third quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on November 2, 2023. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:November 2, 2023By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20230803false000126282300012628232023-08-032023-08-030001262823us-gaap:CommonStockMember2023-08-032023-08-030001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2023-08-032023-08-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 3, 2023

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On August 3, 2023, Westlake Corporation (the "Company"), issued a press release announcing its 2023 second quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on August 3, 2023 to discuss its 2023 second quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2023 second quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on August 3, 2023. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:August 3, 2023By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20230504false000126282300012628232023-05-042023-05-040001262823us-gaap:CommonStockMember2023-05-042023-05-040001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2023-05-042023-05-04

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 4, 2023

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On May 4, 2023, Westlake Corporation (the "Company"), issued a press release announcing its 2023 first quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on May 4, 2023 to discuss its 2023 first quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2023 first quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on May 4, 2023. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:May 4, 2023By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20230221false000126282300012628232023-02-212023-02-210001262823us-gaap:CommonStockMember2023-02-212023-02-210001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2023-02-212023-02-21

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 21, 2023

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On February 21, 2023, Westlake Corporation (the "Company") issued a press release announcing its 2022 fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on February 21, 2023 to discuss its 2022 fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2022 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on February 21, 2023. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CORPORATION

Date:February 21, 2023By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20221103false000126282300012628232022-11-032022-11-030001262823us-gaap:CommonStockMember2022-11-032022-11-030001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2022-11-032022-11-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 3, 2022

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On November 3, 2022, Westlake Corporation (the "Company"), issued a press release announcing its 2022 third quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on November 3, 2022 to discuss its 2022 third quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2022 third quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on November 3, 2022. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:November 3, 2022By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20220802false000126282300012628232022-08-022022-08-020001262823us-gaap:CommonStockMember2022-08-022022-08-020001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2022-08-022022-08-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 2, 2022

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On August 2, 2022, Westlake Corporation, formerly known as Westlake Chemical Corporation (the "Company"), issued a press release announcing its 2022 second quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on August 2, 2022 to discuss its 2022 second quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2022 second quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on August 2, 2022. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:August 2, 2022By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20220503false000126282300012628232022-05-032022-05-030001262823us-gaap:CommonStockMember2022-05-032022-05-030001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2022-05-032022-05-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): May 3, 2022

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On May 3, 2022, Westlake Corporation, formerly known as Westlake Chemical Corporation (the "Company"), issued a press release announcing its 2022 first quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on May 3, 2022 to discuss its 2022 first quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2022 first quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on May 3, 2022. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:May 3, 2022By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20220222false000126282300012628232022-02-222022-02-220001262823us-gaap:CommonStockMember2022-02-222022-02-220001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2022-02-222022-02-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): February 22, 2022

Westlake Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard,Suite 600 Houston,Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On February 22, 2022, Westlake Chemical Corporation (the "Company") issued a press release announcing its 2021 fourth quarter and full year results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Chemical Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on February 22, 2022 to discuss its 2021 fourth quarter and full year results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2021 fourth quarter and full year results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on February 22, 2022. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:February 22, 2022By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20211102false000126282300012628232021-11-022021-11-020001262823us-gaap:CommonStockMember2021-11-022021-11-020001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2021-11-022021-11-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): November 2, 2021

Westlake Chemical Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On November 2, 2021, Westlake Chemical Corporation (the "Company") issued a press release announcing its 2021 third quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Chemical Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on November 2, 2021 to discuss its 2021 third quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2021 third quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on November 2, 2021. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:November 2, 2021By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer

wlk-20210803false000126282300012628232021-08-032021-08-030001262823us-gaap:CommonStockMember2021-08-032021-08-030001262823wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain2021-08-032021-08-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 3, 2021

Westlake Chemical Corporation (Exact name of registrant as specified in its charter)

Delaware001-3226076-0346924 (State or other jurisdiction of incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

2801 Post Oak Boulevard, Suite 600 Houston, Texas77056 (Address of principal executive offices)(Zip Code)

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

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

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.01 par valueWLKThe New York Stock Exchange 1.625% Senior Notes due 2029WLK29The New York Stock Exchange

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

Emerging growth company ☐

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

Item 2.02. Results of Operations and Financial Condition. On August 3, 2021, Westlake Chemical Corporation (the "Company") issued a press release announcing its 2021 second quarter results. A copy of the press release is furnished with this Current Report as Exhibit 99.1. The information furnished pursuant to this Current Report, including Exhibit 99.1, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and will not be incorporated by reference into any registration statement filed by Westlake Chemical Corporation under the Securities Act of 1933, as amended, unless specifically identified as being incorporated therein. Item 7.01. Regulation FD Disclosure. The Company is holding a conference call on August 3, 2021 to discuss its 2021 second quarter results. Information about the call can be found in the press release furnished with this Current Report as Exhibit 99.1. In addition, the Company made available an investor presentation regarding its 2021 second quarter results, which is furnished with this Current Report as Exhibit 99.2. Item 9.01. Financial Statements and Exhibits. (d) Exhibits The following exhibits are furnished herewith: 99.1    Press release issued on August 3, 2021. 99.2    Investor Presentation. 104    The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.

SIGNATURE

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

WESTLAKE CHEMICAL CORPORATION

Date:August 3, 2021By:/S/ ALBERT CHAO Albert Chao President and Chief Executive Officer