Westlake Chemical Partners L.P. (NYSE:WLKP) today announced that its 2021 tax packages, including schedule K-1s, are now available online. They may be accessed online through the K-1 Tax Package Support website www.taxpackagesupport.com/wlkp . First time users will need to sign up for online account access which may also be done on the K-1 Tax Package Support website. The partnership expects to begin mailing K-1s by mid-March. We encourage unit holders to access the K-1s online through the Tax Package Support website at www.taxpackagesupport.com/wlkp for the quickest availability. For additional information, unitholders may call K-1 Tax Package Support toll free at (888) 826-8318 weekdays between 8 a.m. and 5 p.m. CT. About Westlake Chemical Partners LP Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production facilities and other qualified assets. Headquartered in Houston, the Partnership owns a 22.8%

Record annual net sales of $11.8 billion, an increase of 57% vs. 2020 net sales Record annual net income of $2.0 billion, an increase of 511% vs. 2020 net income Record annual EBITDA of $3.7 billion, an increase of 196% vs. 2020 EBITDA Transformational investments of approximately $3.8 billion in building products and Hexion's global epoxy business Integrated portfolio of diversified businesses under one unified brand with two segments – Housing and Infrastructure Products ("HIP") and Performance and Essential Materials ("PEM") Market conditions continue to look favorable Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced record fourth quarter and record full year 2021 results. SUMMARY FINANCIAL HIGHLIGHTS ($ in millions except per share data)     Three Months Ended December 31,   Twelve Months Ended December 31,     2021   2020   2021   2020                   Westlake