X0508 4 2023-08-15 0 0001604665 Westlake Chemical Partners LP WLKP 0001439749 Kenner Andrew 2801 POST OAK BLVD., STE. 600 HOUSTON TX 77056 0 1 0 0 SVP, Olefin Material & Corp Pr 0 Common Units 2023-08-15 4 P 0 855 21.996 A 80855 D Common Units 2023-08-16 4 P 0 3349 22.226 A 84204 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $21.99 to $22.00, inclusive. The reporting person undertakes to provide to Westlake Corp., any security holder of Westlake Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $22.159 to $22.25, inclusive. The reporting person undertakes to provide to Westlake Corp., any security holder of Westlake Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. Mr. Kenner is an officer of Westlake Chemical Partners GP LLC, the general partner of Westlake Chemical Partners LP. Andrew Kenner by J Feng POA 2023-08-16