Westlake Growth & Investment Strategy

• Westlake's History of Delivering Strong Financial Results Sales Ten Year CAGR Performance EBITDA Free Cash Flow Per Share Higher Sales, Margins and Returns Attributable to: Focused Bottom Line Growth • Asset Quality · Operating Rate Advantages • ⚫ Chain Integration Leading Market Positions • Specialty & Downstream Focus Advantaged Feedstock ~14% CAGR $11.8B $3.6B 2012 2021 -19% CAGR $3.7B $0.7B 2012 2021 EBITDA Margin 20.9% 31.4% Ten Year Average of Returns and Margins (2012-2021) Westlake average 10% 25% 20% 15% 10% 5% 0% 9 Source: FactSet: Chemical peers includes: EMN, HUN, OLN, LYB, DOW Building products peer includes: JHX, FBHS, MAS, PGTI, DOOR, CNR, JELD Westlake average 16% -26% CAGR $13.57 $1.65 2012 2021 Westlake average 24% Return on Assets Return on Capital Employed EBITDA Margin Westlake ■Westlake Chemical Peers Building Peers

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