Oceaneering International OII Institutional Ownership

NYSE OII

$36.67 -7.42 (-16.83%)

As of: Oct 22, 2026 · 3:59 PM EDT

Institutions by Trading Activity

376 Institutions

Increased 217 57.7%

Unchanged 50 13.3%

Reduced 109 29.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

—

13F totals exceed reported shares outstanding

Shares Held by Institutions

104.16Mn

of 99.67Mn outstanding

▲+2.42% QoQ

Shares Outstanding

99.67Mn

Institutional Investors

376

filed 13F for Jun 2026

▲+14 vs prior quarter

Net Shares Added (QoQ)

+2.46Mn

accumulated since last quarter

Value of Holdings

$4.58Bn

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

Updated Oct 21, 2026

Oceaneering International Inc (NYSE:OII) appeared in the 13F filings of 376 institutional investors for the quarter ended June 30, 2026.

Total shares held in Oceaneering International rose 2.42% from Q1 2026, while the number of holders rose 32.86% from Q2 2025.
Of the 376 holders, 217 added to their positions, 109 reduced their stakes and 50 left their positions unchanged in Q2 2026.
Institutional investors held 104.16Mn shares of Oceaneering International in total at the end of Q2 2026, up 2.46Mn from the prior quarter and up 13.61Mn from a year earlier.
As of June 30, 2026, BlackRock, Inc. held the largest stake in Oceaneering International with 16.4Mn shares.
Among holders that already owned Oceaneering International, the biggest buyers in Q2 2026 were Franklin Templeton Inc (+2.23Mn shares), Barrow Hanley Mewhinney & Strauss LLC (+852K shares), Geode Capital Management, LLC (+463.09K shares), Bank of New York Mellon Corp (+371.52K shares) and Vanguard Portfolio Management LLC (+348.02K shares).
The largest position reductions in OII for Q2 2026 were by Brown Advisory Inc (-821.29K shares), Algert Global LLC (-399.09K shares), Morgan Stanley Institutional Investment Advisors LLC (-386.99K shares), Barclays PLC (-281.98K shares) and Van Eck Associates Corp (-211.56K shares).
According to Business Quant data, the leading holders of OII for Q2 2026 were BlackRock, Inc. (16.4Mn shares), Vanguard Portfolio Management LLC (7.93Mn shares), State Street Corp (4.99Mn shares), Brown Advisory Inc (4.97Mn shares), Vanguard Capital Management LLC (4.49Mn shares), American Century Companies Inc (4.02Mn shares), Earnest Partners LLC (3.55Mn shares), Dimensional Fund Advisors LP (3.55Mn shares), Neuberger Berman Group LLC (3.23Mn shares) and Morgan Stanley Institutional Investment Advisors LLC (3.07Mn shares).

Form 13F Holdings

377 Institutional Holders

Report period 30 Jun, 2026

Total shares held 104.16Mn

Of outstanding —

#	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	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	1,339,591	1.34%	▼43,533	-3.15%	$54.28Mn
20	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	0000921739	1,330,080	1.33%	▲1,330,080	0.00%	$53.90Mn

Showing 1 to 20 of 377 holders