SCHEDULE 13G 0001388814 XXXXXXXX LIVE Com Unit RP LP 06/30/2025 0001604665 Westlake Chemical Partners LP 960417103 2801 Post Oak Boulevard Suite 600 Houston TX 77056 Rule 13d-1(b) Energy Income Partners, LLC a DE 403727.00 1370817.00 403727.00 1370817.00 1774544.00 N 5.04 IA James J. Murchie a FL 403727.00 1370817.00 403727.00 1370817.00 1774544.00 N 5.04 HC Eva Pao a CT 403727.00 1370817.00 403727.00 1370817.00 1774544.00 N 5.04 HC Saul Ballesteros a CT 403727.00 1370817.00 403727.00 1370817.00 1774544.00 N 5.04 HC John K. Tysseland a CT 403727.00 1370817.00 403727.00 1370817.00 1774544.00 N 5.04 HC Westlake Chemical Partners LP 2801 Post Oak Boulevard Suite 600 Houston, TX, 77056 Energy Income Partners, LLC James Murchie Eva Pao Saul Ballesteros John Tysseland 10 Wright Street Westport, Connecticut 06880 Energy Income Partners, LLC is a Delaware limited liability company James Murchie is a citizen of the United States of America Eva Pao is a citizen of the United States of America Saul Ballesteros is a citizen of the United States of America John Tysseland is a citizen of the United States of America N IA OO 1774544 5.04 403727 1370817 403727 1370817 Y Y Y N A description of the group membership has been filed as an exhibit. Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. A description of the group membership has been filed as an exhibit. Energy Income Partners, LLC /s/ Nandita Hogan 08/14/2025 James J. Murchie /s/ James J. Murchie 08/14/2025 Eva Pao Eva Pao 08/14/2025 Saul Ballesteros /s/ Saul Ballesteros 08/14/2025 John K. Tysseland John K. Tysseland 08/14/2025