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 September 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.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 3.3M | 22.6% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.8M | 19.2% |
| REINHART PARTNERS, LLC. | 1.7M | 11.3% |
| Fisher Asset Management, LLC | 701.5K | 4.8% |
| Bank of New York Mellon Corp | 690.4K | 4.7% |
| PRINCIPAL FINANCIAL GROUP INC | 606.8K | 4.2% |
| Ranger Investment Management, L.P. | 549.0K | 3.8% |
| Boston Trust Walden Corp | 452.7K | 3.1% |
| KEATING INVESTMENT COUNSELORS INC | 331.1K | 2.3% |
| Granite Investment Partners, LLC | 282.5K | 1.9% |
| HENNESSY ADVISORS INC | 243.4K | 1.7% |
| Russell Investments Group, Ltd. | 200.5K | 1.4% |
| Concurrent Investment Advisors, LLC | 196.6K | 1.3% |
| LEUTHOLD GROUP, LLC | 155.4K | 1.1% |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 146.5K | 1.0% |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM | 131.3K | 0.9% |
| Squarepoint Ops LLC | 101.0K | 0.7% |
| DEUTSCHE BANK AG\ | 98.3K | 0.7% |
| ISTHMUS PARTNERS, LLC | 91.6K | 0.6% |
| Creative Planning | 90.6K | 0.6% |
| HARBOR CAPITAL ADVISORS, INC. | 81.7K | 0.6% |
| Mitsubishi UFJ Asset Management Co., Ltd. | 76.1K | 0.5% |
| Spire Wealth Management | 72.4K | 0.5% |
| OPPENHEIMER ASSET MANAGEMENT INC. | 66.7K | 0.5% |
| Thrivent Financial for Lutherans | 63.3K | 0.4% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Bank of New York Mellon Corp | Reduced | 1.1M | 690.4K | -436.4K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 3.5M | 3.3M | -254.9K |
| Ranger Investment Management, L.P. | Reduced | 777.6K | 549.0K | -228.7K |
| Spire Wealth Management | New | 0 | 72.4K | +72.4K |
| Fisher Asset Management, LLC | Increased | 635.1K | 701.5K | +66.3K |
| Concurrent Investment Advisors, LLC | Increased | 131.5K | 196.6K | +65.2K |
| Russell Investments Group, Ltd. | Reduced | 258.1K | 200.5K | -57.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 2.8M | 2.8M | -48.5K |
| Granite Investment Partners, LLC | Reduced | 328.4K | 282.5K | -45.9K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 40.2K | +40.2K |
| Squarepoint Ops LLC | Increased | 62.0K | 101.0K | +39.0K |
| CITIGROUP INC | Reduced | 72.1K | 35.0K | -37.2K |
| SummerHaven Investment Management, LLC | Sold Out | 36.2K | 0 | -36.2K |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM | Reduced | 159.5K | 131.3K | -28.2K |
| BARCLAYS PLC | Increased | 16.7K | 40.8K | +24.1K |
| HENNESSY ADVISORS INC | Reduced | 267.1K | 243.4K | -23.7K |
| Tower View Wealth Management LLC | New | 0 | 23.3K | +23.3K |
| Sigma Planning Corp | Increased | 11.4K | 30.4K | +19.0K |
| Riverwater Partners LLC | Increased | 25.8K | 43.7K | +17.9K |
| FIFTH THIRD BANCORP | Increased | 30.2K | 48.0K | +17.8K |
| RFG Advisory, LLC | New | 0 | 17.6K | +17.6K |
| CWA Asset Management Group, LLC | Reduced | 29.6K | 12.1K | -17.5K |
| State of Alaska, Department of Revenue | Reduced | 36.5K | 19.5K | -17.0K |
| IMC-Chicago, LLC | Sold Out | 16.2K | 0 | -16.2K |
| Creative Planning | Increased | 74.8K | 90.6K | +15.8K |
| Ethic Inc. | New | 0 | 15.2K | +15.2K |
| SIMPLEX TRADING, LLC | Sold Out | 14.8K | 0 | -14.8K |
| Diversified Trust Co | Increased | 20.7K | 34.3K | +13.6K |
| PRINCIPAL FINANCIAL GROUP INC | Increased | 593.6K | 606.8K | +13.2K |
| Veracity Capital LLC | New | 0 | 13.2K | +13.2K |
| LEUTHOLD GROUP, LLC | Increased | 142.9K | 155.4K | +12.5K |
| Boston Trust Walden Corp | Reduced | 464.8K | 452.7K | -12.2K |
| Kestra Advisory Services, LLC | Reduced | 48.6K | 36.5K | -12.1K |
| Cambridge Investment Research Advisors, Inc. | Reduced | 22.8K | 11.0K | -11.8K |
| VIRGINIA RETIREMENT SYSTEMS ET Al | Increased | 6.6K | 17.3K | +10.7K |
| Tannin Capital LLC | Sold Out | 10.1K | 0 | -10.1K |
| HARBOR CAPITAL ADVISORS, INC. | Increased | 71.7K | 81.7K | +10.0K |
| SteelPeak Wealth, LLC | Reduced | 16.5K | 6.5K | -10.0K |
| State of Wyoming | Increased | 7.8K | 17.4K | +9.7K |
| VERUS CAPITAL PARTNERS, LLC | Increased | 5.4K | 15.1K | +9.7K |
| STRS OHIO | Increased | 27.1K | 36.1K | +9.0K |
| ZIONS BANCORPORATION, NATIONAL ASSOCIATION /UT/ | Reduced | 17.9K | 9.9K | -8.0K |
| Maryland State Retirement & Pension System | Increased | 14.5K | 22.1K | +7.6K |
| Sumitomo Mitsui Trust Group, Inc. | Reduced | 26.8K | 19.4K | -7.4K |
| Annex Advisory Services, LLC | Reduced | 67.3K | 60.0K | -7.3K |
| NorthCrest Asset Manangement, LLC | Sold Out | 6.8K | 0 | -6.8K |
| DEUTSCHE BANK AG\ | Reduced | 104.7K | 98.3K | -6.4K |
| State of New Jersey Common Pension Fund D | Reduced | 41.6K | 35.4K | -6.3K |
| MACKENZIE FINANCIAL CORP | Sold Out | 6.3K | 0 | -6.3K |
| StoneX Group Inc. | New | 0 | 5.8K | +5.8K |
| NISA INVESTMENT ADVISORS, LLC | Reduced | 16.5K | 11.1K | -5.4K |
| ESSEX INVESTMENT MANAGEMENT CO LLC | Reduced | 151.5K | 146.5K | -5.0K |
| COMPASS FINANCIAL MANAGEMENT LLC | Reduced | 5.0K | 29 | -5.0K |
| HERITAGE INVESTORS MANAGEMENT CORP | New | 0 | 4.9K | +4.9K |
| NOESIS CAPITAL MANGEMENT CORP | New | 0 | 4.9K | +4.9K |
| QUADRANT CAPITAL GROUP LLC | Reduced | 6.8K | 1.9K | -4.8K |
| Mitsubishi UFJ Asset Management Co., Ltd. | Increased | 71.3K | 76.1K | +4.8K |
| Thrivent Financial for Lutherans | Reduced | 67.6K | 63.3K | -4.3K |
| Legacy Capital Group California, Inc. | Reduced | 14.2K | 10.0K | -4.2K |
| ISTHMUS PARTNERS, LLC | Reduced | 95.8K | 91.6K | -4.1K |
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.