<ACCESSION-NUMBER>0001193125-18-021634 <TYPE>SC 13G/A <PUBLIC-DOCUMENT-COUNT>2 <FILING-DATE>20180126 <DATE-OF-FILING-DATE-CHANGE>20180126 <GROUP-MEMBERS>WESTLAKE CHEMICAL CORP <GROUP-MEMBERS>WESTLAKE CHEMICAL INVESTMENTS, INC. <GROUP-MEMBERS>WESTLAKE OLEFINS CORP <GROUP-MEMBERS>WESTLAKE POLYMERS LLC <SUBJECT-COMPANY> <COMPANY-DATA> <CONFORMED-NAME>Westlake Chemical Partners LP <CIK>0001604665 <ASSIGNED-SIC>2860 <IRS-NUMBER>320436529 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>SC 13G/A <ACT>34 <FILE-NUMBER>005-88276 <FILM-NUMBER>18552077 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>2801 POST OAK BOULEVARD <STREET2>SUITE 600 <CITY>HOUSTON <STATE>TX <ZIP>77056 <PHONE>(713) 960-9111 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>2801 POST OAK BOULEVARD <STREET2>SUITE 600 <CITY>HOUSTON <STATE>TX <ZIP>77056 </MAIL-ADDRESS> </SUBJECT-COMPANY> <FILED-BY> <COMPANY-DATA> <CONFORMED-NAME>WPT LLC <CIK>0001262852 <IRS-NUMBER>760469048 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>SC 13G/A </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>2801 POST OAK BLVD <STREET2>SUITE 600 <CITY>HOUSTON <STATE>TX <ZIP>77056 <PHONE>713-960-9111 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>2801 POST OAK BLVD <STREET2>SUITE 600 <CITY>HOUSTON <STATE>TX <ZIP>77056 </MAIL-ADDRESS> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>WPT LP <DATE-CHANGED>20030908 </FORMER-COMPANY> </FILED-BY>