Westlake appoints new Performance segment leader

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What executive leadership change did Westlake (WLK) announce?

Who is Robert F. Buesinger and what is his new role at Westlake (WLK)?

Who is taking over as Performance & Essential Materials Segment Head at Westlake (WLK)?

When do the Westlake (WLK) leadership changes become effective?

What board action did Westlake (WLK) take regarding its Performance & Essential Materials segment?

Westlake Corporation announced a leadership transition in its Performance & Essential Materials segment.

Accepted by SEC EDGAR 04/02/2026 - 08:01 AM EDT

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Form Type

8-K

Westlake Corporation announced a leadership transition in its Performance & Essential Materials segment. Robert F. Buesinger, currently Executive Vice President and Segment Head, will move to the role of Special Advisor to the President, effective April 2, 2026.

On the same date, the Board appointed Brian Powers as Senior Vice President, Performance & Essential Materials Segment Head. This change reflects planned succession around Mr. Buesinger’s upcoming retirement and keeps him involved in an advisory capacity to support continuity.

Item 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

1 item

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

Board approval date: March 30, 2026 Effective date of role changes: April 2, 2026 Senior Notes coupon and maturity: 1.625% due 2029

3 metrics

Board approval date March 30, 2026 Board approved transition of Buesinger and appointment of Powers

Effective date of role changes April 2, 2026 Both Buesinger’s advisor role and Powers’s SVP role become effective

Senior Notes coupon and maturity 1.625% due 2029 Westlake 1.625% Senior Notes due 2029 listed on NYSE

Emerging growth company, Special Advisor to the President, Performance & Essential Materials Segment Head, Senior Vice President, +1 more

5 terms

Emerging growth company regulatory

"Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company"

An emerging growth company is a recently public or smaller public firm that qualifies for temporary, lighter regulatory and disclosure rules to reduce the cost and effort of being public. For investors, it means the company may provide less historical financial detail and face fewer reporting requirements than larger firms, so it can grow more quickly but also carries higher uncertainty—like buying a promising early-stage product with fewer user reviews.

Special Advisor to the President financial

"approved the transition of Mr. Buesinger to the role of Special Advisor to the President of the Company"

Performance & Essential Materials Segment Head financial

"Executive Vice President, Performance & Essential Materials Segment Head of Westlake Corporation"

Senior Vice President financial

"the Board appointed Brian Powers as Senior Vice President, Performance & Essential Materials Segment Head of the Company"

A senior vice president is a high-ranking executive within a company who oversees large parts of the organization and helps shape its overall strategy. They are often just below top leadership, making important decisions that can impact the company's success. For investors, this role indicates a person with significant responsibility and influence, which can affect the company's stability and growth prospects.

Senior Notes due 2029 financial

"1.625% Senior Notes due 2029 | | WLK 29 | | The New York Stock Exchange"

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Westlake announced a leadership transition in its Performance & Essential Materials segment. Robert F. Buesinger will move from Executive Vice President and Segment Head to Special Advisor to the President, while Brian Powers becomes Senior Vice President and Segment Head, both effective April 2, 2026.

Robert F. Buesinger is Executive Vice President and Performance & Essential Materials Segment Head. In connection with his upcoming retirement, he will transition to Special Advisor to the President of Westlake Corporation, effective April 2, 2026, remaining involved in the company in an advisory capacity.

Brian Powers has been appointed Senior Vice President, Performance & Essential Materials Segment Head at Westlake Corporation. His appointment becomes effective April 2, 2026, following the transition of Robert F. Buesinger to a Special Advisor role supporting the company’s president.

The leadership changes become effective April 2, 2026. On that date, Robert F. Buesinger moves to Special Advisor to the President, and Brian Powers assumes the role of Senior Vice President, Performance & Essential Materials Segment Head for Westlake Corporation.

On March 30, 2026, Westlake’s Board of Directors approved a leadership transition for its Performance & Essential Materials segment. The board endorsed Robert F. Buesinger’s move to Special Advisor and appointed Brian Powers as Senior Vice President and Segment Head, effective April 2, 2026.

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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): March 30, 2026

Westlake Corporation

(Exact name of registrant as specified in its charter)

Delaware

001-32260

76-0346924

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)


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

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

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

☐

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

☐

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

☐

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

☐

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

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


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock	WLK	The New York Stock Exchange
1.625% Senior Notes due 2029	WLK 29	The 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 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On March 30, 2026, in connection with the upcoming retirement of Robert F. Buesinger, Executive Vice President, Performance & Essential Materials Segment Head of Westlake Corporation (the “Company”), the Board of Directors of the Company (the “Board”) approved the transition of Mr. Buesinger to the role of Special Advisor to the President of the Company, effective as of April 2, 2026. In connection with the transition, the Board appointed Brian Powers as Senior Vice President, Performance & Essential Materials Segment Head of the Company, effective as of April 2, 2026.

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.

Source: View Original Filing on SEC EDGAR

WESTLAKE CORPORATION

Date: April 2, 2026

/s/ L. Benjamin Ederington

L. Benjamin Ederington

Executive Vice President, Legal and External Affairs

4 documents