Westlake Corporation (WLK) - Market capitalization

Market cap: NZ$20.05 Billion

As of May 2026 Westlake Corporation has a market cap of NZ$20.05 Billion. This makes Westlake Corporation the world's 1800th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of Westlake Corporation from 2004 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	NZ$20.05 B	22.79%
2025	NZ$16.33 B	-37.37%
2024	NZ$26.08 B	-8.04%
2023	NZ$28.35 B	37.68%
2022	NZ$20.59 B	13.32%
2021	NZ$18.17 B	25.84%
2020	NZ$14.44 B	8.01%
2019	NZ$13.37 B	5.52%
2018	NZ$12.67 B	-34.56%
2017	NZ$19.36 B	85.87%
2016	NZ$10.41 B	0.81%
2015	NZ$10.33 B	-0.25%
2014	NZ$10.36 B	4.63%
2013	NZ$9.90 B	53.55%
2012	NZ$6.44 B	87.8%
2011	NZ$3.43 B	-8.02%
2010	NZ$3.73 B	64.85%
2009	NZ$2.26 B	22.88%
2008	NZ$1.84 B	13.52%
2007	NZ$1.62 B	-44.16%
2006	NZ$2.90 B	5.91%
2005	NZ$2.74 B	-9.64%
2004	NZ$3.03 B

End of Day market cap according to different sources

On May 18th, 2026 the market cap of Westlake Corporation was reported to be:

NZ$20.06 Billion

by Nasdaq

NZ$20.05 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Albemarle ALB	NZ$35.47 B	76.87%	🇺🇸 USA
Celanese CE	NZ$10.46 B	-47.83%	🇺🇸 USA
Dow DOW	NZ$47.56 B	137.17%	🇺🇸 USA
Eastman Chemical EMN	NZ$13.88 B	-30.77%	🇺🇸 USA
Phillips 66 PSX	NZ$123.38 B	515.18%	🇺🇸 USA
Exxon Mobil XOM	NZ$1.138 T	5,576.87%	🇺🇸 USA
Honeywell HON	NZ$235.59 B	1,074.66%	🇺🇸 USA
Olin Corporation OLN	NZ$5.27 B	-73.69%	🇺🇸 USA
Huntsman Corporation HUN	NZ$4.14 B	-79.33%	🇺🇸 USA

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of Westlake Corporation (WLK)

Market cap: NZ$20.05 Billion