Item 4. CONTROLS AND PROCEDURES

As of September 30, 2025, with the participation of our management, our Chief Executive Officer (principal executive officer) and our Chief Financial Officer (principal financial officer) carried out an evaluation, pursuant to Rule 13a-15(b) of the Securities Exchange Act of 1934, as amended (the “Act”), of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) of the Act). Based upon that evaluation, our Chief Executive Officer and our Chief Financial Officer concluded that our disclosure controls and procedures were effective as of September 30, 2025.

There have been no changes in our internal controls over financial reporting, as defined in Rule 13a-15(f) of the Act, in the period covered by this report, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1. LEGAL PROCEEDINGS

Environmental Matters

From time to time, we and our joint ventures receive notices or inquiries from government entities regarding alleged violations of environmental laws and regulations pertaining to, among other things, the disposal, emission and storage of chemical and petroleum substances, including hazardous wastes. U.S. Securities and Exchange Commission rules require disclosure of certain environmental matters when a governmental authority is a party to the proceedings and the proceedings involve potential monetary sanctions that we reasonably believe could exceed $300,000. The matters below are disclosed solely pursuant to that requirement and we do not believe that any of these proceedings will have a material impact on the Company’s Consolidated Financial Statements.

In April 2025, the State of Texas filed suit against Equistar Chemicals, L.P., a subsidiary of LyondellBasell N.V., in Travis County District Court seeking civil penalties and injunctive relief for violations of the Texas Clean Air Act related to several alleged emission events between May 2018 and April 2021.

In May 2025, the Texas Commission on Environmental Quality issued a proposed Agreed Order to Equistar Chemicals, L.P., a subsidiary of LyondellBasell N.V., to resolve alleged air permitting exceedances at the La Porte Complex between 2020 and 2022.

Litigation and Other Matters

Information regarding our litigation and legal proceedings can be found in Note 11 to the Consolidated Financial Statements, which is incorporated into this Item 1 by reference.