Oceaneering International market cap OII

Share price times shares outstanding: what the whole company sells for, since 2010.

Oceaneering International is worth $3.9B at the close on Oct 23, 2026, at $39.27 a share.

That is up 66% over the last year and up 188% over five years.

Its highest close in our data was $9.3B in Oct 2013.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$3.9B	$2.5B	$5.3B	+62%
2025	$2.4B	$1.7B	$2.8B	−5%
2024	$2.5B	$2B	$3B	+19%
2023	$2.1B	$1.6B	$2.6B	+22%
2022	$1.8B	$765M	$1.8B	+55%
2021	$1.1B	$839.1M	$1.8B	+43%
2020	$789.5M	$281M	$1.6B	−46%
2019	$1.5B	$1.2B	$2B	+24%
2018	$1.2B	$1.1B	$2.8B	−43%
2017	$2.1B	$1.8B	$2.8B	−25%
2016	$2.8B	$2.3B	$3.6B	−25%
2015	$3.7B	$3.6B	$6.2B	−41%
2014	$6.3B	$6.2B	$8.4B	−26%
2013	$8.5B	$6.1B	$9.3B	+50%
2012	$5.7B	$4.8B	$6.2B	+14%
2011	$5B	$3.8B	$5.2B	+25%
2010	$4B	$2.7B	$4B	n/a

Companies in Oil & Gas Equipment & Services nearest Oceaneering International's size, closest first, today.

Company	Market cap
OIIOceaneering International	$3.9B
SEISolaris Energy Infrastructure	$4.5B
WHDCactus	$5.1B
LBRTLiberty Energy	$2.5B
WFRDWeatherford International	$6.2B
NOVNOV	$7B
INVXInnovex International	$2.1B
RESRPC	$1.4B
HOSHornbeck Offshore Services	$1B
FTITechnipFMC	$27.4B
HALHalliburton	$29.1B
Peer median	$4.8B