Westlake Growth & Investment Strategy

Growth Fueled by Consistent Capital Discipline Major Investment History Ten Year Average of Returns and Margins Acquisitions Expansions Vinnolit (2014) Axiall (2016) NAKAN (2019) Lake Charles Ethylene (2014) Calvert City Ethylene (2014) Calvert City PVC (2014) 25% 20% DaVinci (2019) Lake Charles Ethylene (2016) LACC (2019) Calvert City (2017) 15% LASCO (2021) Geismar Chlor-Alkali (2019) 2012-2021 avg. of 10% vs. peer avg. of 6% Dimex (2021) Geismar PVC (2019) Boral (2021) Plaquemine PVC (2020) 10% Epoxy (2022) Gendorf VCM & C-A (2021) Significant investment optionality focused on: 5% . Increased margins due to integration • Operating rate advantages • Feedstock advantages • Asset quality Product mix • Strategic growth 2012-2021 avg. of 16% vs. peer avg. of 12% 2012-2021 avg. of 24% vs. peer avg. of 14% 0% Return on Assets Return on Capital Employed EBITDA Margin ■ Westlake ■Chemical Peers ■Building Peers Resulting in outsized returns and margins 92 22 Source: Bloomberg, Peer averages as of latest available year Chemical peers includes: EMN, HUN, OLN, LYB, DOW 35+ Year Record of Value Creative Capital Allocation Building products peer includes: JHX, FBHS, MAS, PGTI, DOOR, CNR, JELD Westlake

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