Westlake Chemical Partners LP Filed Annual Report HOUSTON--(BUSINESS WIRE)--Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") announced that it filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 with the Securities and Exchange Commission on February 28, 2020. A copy of this 10-K may be found on the Partnership's website, www.wlkpartners.com, by selecting the "Investor Relations" tab, then "SEC 10-K Filings." Unitholders of the Partnership may receive a hard copy of its Annual Report on Form 10-K, inc