Oceaneering International Inc (OII) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

100,407,042Shares Outstanding

469,651Shares held by institutions

$15,197,906Value of institutional holdings

99.11%Institutional ownership %

6.19%Shares Changed QoQ

296No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 296 institutions have reported a stake in Oceaneering International Inc (NYSE:OII) as of December 2025, according to recent 13F filings with the SEC.

The percentage of Oceaneering International owned by institutions changed from 95.5% in September 2025 to 99.1% in December 2025, marking a slight up trend.
The company experienced a 6.19% quarterly change in institutional shares held, alongside an increase of 3.86% in total owners annually.
A review of institutional activity for Oceaneering International shows 150 of 296 filers increasing their positions, while 103 reduced their stake, and 43 remained unchanged.
The aggregate institutional position in Oceaneering International now stands at 99.51Mn shares as of December 2025, after investors increased their holdings (up by 5.80Mn shares quarter on quarter which is down 1.24Mn shares year over year).
The top institutional stake in Oceaneering International as of December 31, 2025 belongs to BlackRock, Inc., which owns 16.00Mn shares, or 15.94% of the company.
Among the most significant buyers of Oceaneering International during December 2025 were Morgan Stanley Institutional Investment Advisors LLC (3.95Mn), Point72 Asset Management, L.P. (581.71K), Qube Research & Technologies Ltd (466.56K), AGF MANAGEMENT LTD (374.72K), BlackRock, Inc. (334.42K).
Leading sellers of Oceaneering International stock in December 2025 included FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ (445.15K), Aristotle Capital Boston, LLC (393.49K), Edgestream Partners, L.P. (282.53K), BROWN ADVISORY INC (275.28K), FRANKLIN RESOURCES INC (256.54K).
The top 10 institutional holders of Oceaneering International for the quarter ending December 2025 included BlackRock, Inc. (16.00Mn), VANGUARD GROUP INC (12.37Mn), BROWN ADVISORY INC (7.43Mn), STATE STREET CORP (4.65Mn), Morgan Stanley Institutional Investment Advisors LLC (3.95Mn), EARNEST PARTNERS LLC (3.79Mn), AMERICAN CENTURY COMPANIES INC (3.61Mn), DIMENSIONAL FUND ADVISORS LP (3.48Mn), Neuberger Berman Group LLC (3.34Mn), Greenhouse Funds LLLP (2.47Mn).

296 Institutional Holders

469,651 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	16,003,350	334,417	2.13%	$384,560,495.00
VANGUARD GROUP INC	31 Dec, 2025	12,371,147	187,707	1.54%	$297,278,664.00
BROWN ADVISORY INC	31 Dec, 2025	7,426,981	-275,282	-3.57%	$178,470,371.00
STATE STREET CORP	31 Dec, 2025	4,647,252	215,366	4.86%	$111,673,466.00
Morgan Stanley Institutional Investment Advisors LLC	31 Dec, 2025	3,947,022	3,947,022	0.00%	$94,846,948.00
EARNEST PARTNERS LLC	31 Dec, 2025	3,791,599	-225,099	-5.60%	$91,112,124.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	3,608,090	-34,783	-0.95%	$86,702,403.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	3,477,068	191,117	5.82%	$83,556,317.00
Neuberger Berman Group LLC	31 Dec, 2025	3,335,121	-204,437	-5.78%	$80,142,958.00
Greenhouse Funds LLLP	31 Dec, 2025	2,468,260	-23,543	-0.94%	$59,312,288.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,304,738	51,871	2.30%	$55,396,372.00
LOOMIS SAYLES & CO L P	31 Dec, 2025	1,831,434	-65,603	-3.46%	$44,009,359.00
VAN ECK ASSOCIATES CORP	31 Dec, 2025	1,500,057	170,762	12.85%	$36,047.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	1,442,874	25,451	1.80%	$34,672,262.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	1,273,669	-151,709	-10.64%	$30,606,266.00
ROYAL BANK OF CANADA	31 Dec, 2025	1,221,789	-67,116	-5.21%	$29,360,000.00
NORTHERN TRUST CORP	31 Dec, 2025	1,216,859	84,952	7.51%	$29,241,121.00
Qube Research & Technologies Ltd	31 Dec, 2025	1,165,936	466,556	66.71%	$28,017,442.00
MORGAN STANLEY	31 Dec, 2025	1,041,053	26,200	2.58%	$25,016,523.00
FORT WASHINGTON INVESTMENT ADVISORS INC /OH/	31 Dec, 2025	856,644	-445,148	-34.20%	$20,585,155.00

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