Westlake Corporation completes ACI/Perplastic compounding acquisition

Westlake Corporation has completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group.

Rhea-AI Filing Summary

Westlake Corporation has completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group. The company disclosed the closing through a press release dated January 5, 2026, which is furnished as Exhibit 99.1 under a Regulation FD disclosure. This step confirms that the transaction has moved from agreement to completion.

The furnished press release is not treated as filed for liability purposes under the Exchange Act and is not automatically incorporated into other securities law filings unless specifically identified. No purchase price or financial terms are included in this disclosure.

Insights

Chemicals and materials industry analyst

Westlake closes an acquisition in compounding solutions, but terms are not disclosed.

Westlake Corporation reports that it has completed buying the global compounding solutions businesses of the ACI/Perplastic Group. Compounding solutions typically involve blending polymers with additives to create specialized materials, so this move points to an expansion in higher value-added products, though the scale is not quantified here.

The information is provided via a Regulation FD press release furnished as an exhibit, which means it is meant to keep all investors informed at the same time. However, the excerpt does not include purchase price, revenue contribution, or expected synergies, so it is hard to judge how significant the deal is financially.

Subsequent company communications or periodic reports may provide more detail on how this acquisition affects segment revenues, margins, and integration progress, which will help clarify its long-term impact.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Westlake Corporation (WLK) announce in its latest disclosure?

Westlake Corporation announced that it completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group, as stated in a press release furnished as Exhibit 99.1.

When did Westlake complete the acquisition of the ACI/Perplastic compounding businesses?

Westlake completed the acquisition of the global compounding solutions businesses of the ACI/Perplastic Group and announced it in a press release dated January 5, 2026.

How did Westlake Corporation disclose the ACI/Perplastic acquisition closing?

Westlake Corporation disclosed the completion of the acquisition through a press release, which is furnished as Exhibit 99.1 under a Regulation FD disclosure section.

Does the Westlake (WLK) disclosure include the purchase price or financial terms?

The excerpted disclosure states that the acquisition was completed and announced in a press release, but it does not include any purchase price or detailed financial terms.

Is the Westlake ACI/Perplastic acquisition press release considered filed information?

No. The company states that the information furnished, including Exhibit 99.1, is not deemed to be "filed" for purposes of Section 18 of the Exchange Act and is not incorporated into other filings unless specifically identified.

What exhibit relates to Westlake Corporation’s ACI/Perplastic acquisition?

Exhibit 99.1 is the press release issued on January 5, 2026, in which Westlake Corporation announced completion of the acquisition of the ACI/Perplastic Group’s global compounding solutions businesses.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 01/06/2026 - 04:54 PM EST Learn about SEC filing dates

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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): January 6, 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, $0.01 par value			WLK			The New York Stock Exchange
1.625% Senior Notes due 2029			WLK29			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 7.01    Regulation FD Disclosure

On January 5, 2026, Westlake Corporation (the "Company" or "Westlake") issued a press release announcing that it completed its previously announced acquisition of the global compounding solutions businesses of the ACI/Perplastic Group. 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 (the "Exchange Act"), or otherwise subject to the liability of such section, nor shall such information be deemed incorporated by reference into any filing by the Company under the Securities Act of 1933, as amended, or the Exchange Act, unless specifically identified as being incorporated therein.

Item 9.01    Financial Statements and Exhibits.

(d) Exhibits

The following exhibit is furnished herewith:

99.1 Press release issued on January 5, 2026.

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:

January 6, 2026

By:

/s/ L. BENJAMIN EDERINGTON

L. Benjamin Ederington Executive Vice President, Legal and External Affairs