Oceaneering International OII Institutional Ownership

NYSE OII

$44.40 +0.77 (+1.78%)

As of: Oct 1, 2026 · 3:59 PM EDT

Institutions by Trading Activity

377 Institutions

Increased 217 57.6%

Unchanged 51 13.5%

Reduced 109 28.9%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

105.84%

▲+3.67 pp QoQ

Shares Held by Institutions

105.50Mn

of 99.67Mn outstanding

▲+7.52% QoQ

Shares Outstanding

99.67Mn

-5.82Mn held outside 13F filers

Institutional Investors

377

filed 13F for Jun 2026

▲+14 vs prior quarter

Net Shares Added (QoQ)

+7.38Mn

accumulated since last quarter

Value of Holdings

$4.60Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Oceaneering International Inc (NYSE:OII) appears in 377 institutional 13F filings for the quarter ending June 2026.

Collectively, these holders controlled 105.8% of Oceaneering International's outstanding shares in June 2026, up from 102.2% in March 2026.
They increased total shares held in Oceaneering International by 7.52% from last quarter, and the number of investors in OII increased 32.75% annually.
Of these 377 funds, 217 grew their exposure to Oceaneering International, 109 cut back, and 51 maintained positions.
The aggregate institutional position in Oceaneering International amounted to 105.5Mn shares as of June 2026, up by 7.38Mn shares quarter on quarter, and up 14.95Mn shares year over year.
BlackRock, Inc. holds the largest position in OII at 16.4Mn shares as of June 30, 2026, or 16.46% of shares outstanding.
Leading buyers of Oceaneering International shares for the quarter ending June 2026 were Franklin Templeton Inc (2.23Mn), REINHART PARTNERS, LLC. (1.65Mn), Sixth Street Partners Management Company, L.P. (1.34Mn), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (1.33Mn), BARROW HANLEY MEWHINNEY & STRAUSS LLC (852.0K).
The biggest sellers of Oceaneering International for the quarter ending June 2026 included BROWN ADVISORY INC (821.29K), ALGERT GLOBAL LLC (399.09K), Morgan Stanley Institutional Investment Advisors LLC (386.99K), Barclays Plc (281.98K), VAN ECK ASSOCIATES CORP (211.56K).
Per Business Quant, the top 10 investors in OII for the quarter ending June 2026 include BlackRock, Inc. (16.4Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (7.93Mn), State Street Corp (4.99Mn), BROWN ADVISORY INC (4.97Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.49Mn), AMERICAN CENTURY COMPANIES INC (4.02Mn), EARNEST PARTNERS LLC (3.55Mn), DIMENSIONAL FUND ADVISORS LP (3.55Mn), Neuberger Berman Group LLC (3.23Mn), Morgan Stanley Institutional Investment Advisors LLC (3.07Mn).

Form 13F Holdings

377 Institutional Holders

Report period 30 Jun, 2026

Total shares held 105.50Mn

Of outstanding 105.84%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	16,403,230	16.46%	▲54,388	+0.33%	$664.66Mn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	7,926,938	7.95%	▲348,017	+4.59%	$321.20Mn
3	State Street Corp	0000093751	4,994,403	5.01%	▼39,793	-0.79%	$202.37Mn
4	BROWN ADVISORY INC	0001345929	4,967,307	4.98%	▼821,294	-14.19%	$201.28Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	4,485,268	4.50%	▲6,505	+0.15%	$181.74Mn
6	AMERICAN CENTURY COMPANIES INC	0000748054	4,023,994	4.04%	▲257,320	+6.83%	$163.05Mn
7	EARNEST PARTNERS LLC	0001102578	3,547,295	3.56%	▼137,018	-3.72%	$143.74Mn
8	DIMENSIONAL FUND ADVISORS LP	0000354204	3,546,908	3.56%	▲85,159	+2.46%	$143.71Mn
9	Neuberger Berman Group LLC	0001465109	3,228,635	3.24%	▲10,376	+0.32%	$130.82Mn
10	Morgan Stanley Institutional Investment Advisors LLC	0002026079	3,066,015	3.08%	▼386,990	-11.21%	$124.23Mn
11	Franklin Templeton Inc	0000038777	3,060,961	3.07%	▲2,232,589	+269.52%	$124.03Mn
12	GEODE CAPITAL MANAGEMENT, LLC	0001214717	2,839,554	2.85%	▲463,093	+19.49%	$115.08Mn
13	BARROW HANLEY MEWHINNEY & STRAUSS LLC	0000313028	2,272,949	2.28%	▲851,995	+59.96%	$92.10Mn
14	Greenhouse Funds LLLP	0001626220	1,896,343	1.90%	▼136,146	-6.70%	$76.84Mn
15	VAN ECK ASSOCIATES CORP	0000869178	1,849,926	1.86%	▼211,561	-10.26%	$74.96Mn
16	REINHART PARTNERS, LLC.	0001080298	1,648,423	1.65%	▲1,648,423	0.00%	$66.79Mn
17	LOOMIS SAYLES & CO L P	0000312348	1,606,095	1.61%	▼94,194	-5.54%	$65.08Mn
18	Northern Trust Corp	0000073124	1,371,471	1.38%	▲103,543	+8.17%	$55.57Mn
19	Sixth Street Partners Management Company, L.P.	0001812095	1,339,591	1.34%	▲1,339,591	0.00%	$54.28Mn
19	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	1,339,591	1.34%	▼43,533	-3.15%	$54.28Mn

Showing 1 to 20 of 377 holders