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Rule 10b5-1 Trading Arrangements.
−Removed: During the three months ended March 31, 2026, no director or officer of the Partnership's general partner adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K.
+Added: During the three months ended June 30, 2026, no director or officer of the Partnership's general partner adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K.
3.1 Certificate of Limited Partnership of Westlake Chemical Partners LP (incorporated by reference to Exhibit 3.1 to Westlake Chemical Partners LP's Registration Statement on Form S-1 (File No.
12 unchanged sentences
01-36567) filed on March 1, 2018).
+Added: 10.1† Third Amendment to Amended and Restated Senior Unsecured Revolving Credit Agreement dated as of July 8, 2026
+Added: 10.2† Fifth Amendment to Senior Unsecured Revolving Credit Agreement dated as of July 8, 2026
31.1† Rule 13a – 14(a) / 15d – 14(a) Certification (Principal Executive Officer)
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WESTLAKE CHEMICAL PARTNERS LP
−Removed: May 6, 2026 By:
+Added: August 5, 2026 By:
/ S / J EAN -M ARC G ILSON
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(Principal Executive Officer)
−Removed: May 6, 2026 By:
−Removed: S TEVEN B ENDER
−Removed: Steven Bender
−Removed: Executive Vice President, Chief Financial Officer and
+Added: August 5, 2026 By:
+Added: / S / J ONATHAN B AKSHT
+Added: Jonathan Baksht
+Added: Senior Vice President, Chief Financial Officer and
Director of Westlake Chemical Partners GP LLC
1 unchanged sentence
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.