WESTLAKE CORP

The 2023 Form 10-K, filed on February 22, 2024, contained a description of various legal proceedings in which we are involved. See Note 13 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q for an updated description of certain of those proceedings, which information is incorporated by reference herein.

From time to time, we 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 substances, including hazardous wastes. For a description of certain environmental matters involving a governmental authority as a party to the proceedings and potential monetary sanctions that we believe could exceed $1 million (which is less than one percent of our current assets on a consolidated basis as of June 30, 2024), please see the 2023 Form 10-K and Note 13 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q, in addition to the following:

•To resolve alleged violations associated with exceedances of discharge limits under the Natrium facility's National Pollutant Discharge Elimination System ("NPDES") permit, effective August 2020, we have entered into enforcement negotiations with the West Virginia Department of Environmental Protection ("WVDEP"). The resolution of this matter may involve a penalty in excess of $1 million.

•In September 2019, U.S. EPA Region 6 issued a Notice of Violation alleging certain violations of the Clean Air Act following an inspection of the Lake Charles North facility in 2019 by the National Enforcement Investigation Center. The resolution of this matter may involve a penalty in excess of $1 million.

In addition to the matters described above, we are also involved in other legal proceedings incidental to the conduct of our business. From time to time, we 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 substances, including hazardous wastes. We do not believe that any of these legal proceedings will have a material adverse effect on our financial condition, results of operations or cash flows.