OII Oceaneering International Inc.
Oceaneering International Inc. (OII) Institutional Ownership
What the institutions did with OII last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 16.4M | 15.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.9M | 7.3% |
| STATE STREET CORP | 5.0M | 4.6% |
| BROWN ADVISORY INC | 5.0M | 4.6% |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 4.7M | 4.3% |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5M | 4.1% |
| AMERICAN CENTURY COMPANIES INC | 4.0M | 3.7% |
| EARNEST PARTNERS LLC | 3.5M | 3.3% |
| DIMENSIONAL FUND ADVISORS LP | 3.5M | 3.3% |
| NEUBERGER BERMAN GROUP LLC | 3.2M | 3.0% |
| Morgan Stanley Institutional Investment Advisors LLC | 3.1M | 2.8% |
| FRANKLIN RESOURCES INC | 3.1M | 2.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.8M | 2.6% |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | 2.3M | 2.1% |
| Greenhouse Funds LLLP | 1.9M | 1.7% |
| VAN ECK ASSOCIATES CORP | 1.8M | 1.7% |
| REINHART PARTNERS, LLC. | 1.6M | 1.5% |
| LOOMIS SAYLES & CO L P | 1.6M | 1.5% |
| NORTHERN TRUST CORP | 1.4M | 1.3% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3M | 1.2% |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.3M | 1.2% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.3M | 1.2% |
| MORGAN STANLEY | 1.2M | 1.1% |
| Bank of New York Mellon Corp | 1.1M | 1.0% |
| GOLDMAN SACHS GROUP INC | 1.1M | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | Increased | 119.6K | 4.7M | +4.6M |
| FRANKLIN RESOURCES INC | Increased | 828.4K | 3.1M | +2.2M |
| REINHART PARTNERS, LLC. | New | 0 | 1.6M | +1.6M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | New | 0 | 1.3M | +1.3M |
| Boston Partners | Sold Out | 854.9K | 0 | -854.9K |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Increased | 1.4M | 2.3M | +852.0K |
| BROWN ADVISORY INC | Reduced | 5.8M | 5.0M | -821.3K |
| Qube Research & Technologies Ltd | Sold Out | 588.3K | 0 | -588.3K |
| FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ | Sold Out | 526.0K | 0 | -526.0K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 2.4M | 2.8M | +463.1K |
| ALGERT GLOBAL LLC | Reduced | 452.9K | 53.8K | -399.1K |
| Morgan Stanley Institutional Investment Advisors LLC | Reduced | 3.5M | 3.1M | -387.0K |
| Bank of New York Mellon Corp | Increased | 755.3K | 1.1M | +371.5K |
| AGF MANAGEMENT LTD | Sold Out | 365.9K | 0 | -365.9K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 7.6M | 7.9M | +348.0K |
| BESSEMER GROUP INC | Increased | 1.9K | 331.2K | +329.3K |
| BARCLAYS PLC | Reduced | 298.7K | 16.7K | -282.0K |
| HENNESSY ADVISORS INC | New | 0 | 267.1K | +267.1K |
| AMERICAN CENTURY COMPANIES INC | Increased | 3.8M | 4.0M | +257.3K |
| VAN ECK ASSOCIATES CORP | Reduced | 2.1M | 1.8M | -211.6K |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Reduced | 604.2K | 399.7K | -204.6K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 207.3K | 24.2K | -183.1K |
| MORGAN STANLEY | Increased | 1.0M | 1.2M | +167.2K |
| Fisher Asset Management, LLC | Reduced | 792.3K | 635.1K | -157.1K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 154.7K | +154.7K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.