Occidental Petroleum (OXY) - Market capitalization

Market cap: £44.40 Billion

As of September 2026 Occidental Petroleum has a market cap of £44.40 Billion. This makes Occidental Petroleum the world's 426th 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 Occidental Petroleum from 1996 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£44.40 B	52.33%
2025	£29.15 B	-19.71%
2024	£36.31 B	-11.72%
2023	£41.13 B	-13.09%
2022	£47.32 B	135.93%
2021	£20.05 B	69.62%
2020	£11.82 B	-57.91%
2019	£28.09 B	-22.46%
2018	£36.23 B	-13.12%
2017	£41.70 B	-5.46%
2016	£44.11 B	26.61%
2015	£34.84 B	-12.68%
2014	£39.89 B	-13.06%
2013	£45.89 B	20.2%
2012	£38.18 B	-21.98%
2011	£48.93 B	-5.25%
2010	£51.65 B	26.55%
2009	£40.81 B	23.13%
2008	£33.14 B	3.23%
2007	£32.11 B	53.15%
2006	£20.96 B	12.54%
2005	£18.63 B	54.49%
2004	£12.06 B	31.96%
2003	£9.13 B	36.32%
2002	£6.70 B	-2.06%
2001	£6.84 B	13.88%
2000	£6.01 B	22.09%
1999	£4.92 B	39.53%
1998	£3.52 B	-42.03%
1997	£6.08 B	35.44%
1996	£4.49 B

End of Day market cap according to different sources

On Sep 6th, 2026 the market cap of Occidental Petroleum was reported to be:

£44.40 Billion

by Nasdaq

£44.40 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
APA Corporation APA	£11.08 B	-75.03%	🇺🇸 USA
ConocoPhillips COP	£119.34 B	168.74%	🇺🇸 USA
EOG Resources EOG	£56.34 B	26.89%	🇺🇸 USA
Marathon Oil MRO	£11.81 B	-73.39%	🇺🇸 USA
Williams Companies WMB	£67.10 B	51.12%	🇺🇸 USA
Exxon Mobil XOM	£485.17 B	992.55%	🇺🇸 USA
Chevron CVX	£302.76 B	581.78%	🇺🇸 USA
Devon Energy DVN	£39.11 B	-11.92%	🇺🇸 USA
Hess HES	£34.08 B	-23.24%	🇺🇸 USA
Southwestern Energy SWN	£5.80 B	-86.93%	🇺🇸 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 Occidental Petroleum (OXY)

Market cap: £44.40 Billion