Oceaneering International (OII) - Market capitalization

Market cap: A$4.12 Billion

As of December 2025 Oceaneering International has a market cap of A$4.12 Billion. This makes Oceaneering International the world's 4112th 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 Oceaneering International from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	A$4.12 B	0.76%
2024	A$4.09 B	30.14%
2023	A$3.14 B	22.09%
2022	A$2.57 B	65.51%
2021	A$1.55 B	51.64%
2020	A$1.02 B	-51.27%
2019	A$2.10 B	24.48%
2018	A$1.69 B	-36.4%
2017	A$2.66 B	-30.66%
2016	A$3.83 B	-23.85%
2015	A$5.03 B	-29.6%
2014	A$7.15 B	-25.19%
2013	A$9.56 B	71.31%
2012	A$5.58 B	14.92%
2011	A$4.86 B	23.91%
2010	A$3.92 B	9.64%
2009	A$3.57 B	59%
2008	A$2.25 B	-46.97%
2007	A$4.24 B	54.75%
2006	A$2.74 B	50.49%
2005	A$1.82 B	46.31%
2004	A$1.24 B	35.57%
2003	A$0.91 B	-14.61%
2002	A$1.07 B	4.42%
2001	A$1.03 B	28.62%
2000	A$0.80 B	54.59%
1999	A$0.51 B	-6.56%
1998	A$0.55 B	-20.15%
1997	A$0.69 B	48.67%
1996	A$0.46 B

End of Day market cap according to different sources

On Dec 4th, 2025 the market cap of Oceaneering International was reported to be:

A$4.10 Billion

by Nasdaq

A$4.12 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Helix Energy Solutions HLX	A$1.66 B	-59.53%	🇺🇸 USA
Tetra Technologies TTI	A$1.78 B	-56.69%	🇺🇸 USA
Halliburton HAL	A$35.86 B	769.26%	🇺🇸 USA
Forum Energy Technologies FET	A$0.62 B	-84.85%	🇺🇸 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 Oceaneering International (OII)

Market cap: A$4.12 Billion