Who owns Oceaneering International (OII)
Which tracked institutional funds hold OII, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OII company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
126 tracked funds added or opened OII while 66 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
OII’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes OII more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in OII divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 351 tracked filers holding OII, 202 increased or opened the position and 181 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in OII between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 24
- REINHART PARTNERS, LLC.$67M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$54M
- HENNESSY ADVISORS INC$11M
- Jupiter Topco LLC$6M
- MILLENNIUM MANAGEMENT LLC$6M
- MARSHALL WACE, LLP$4M
Full exits 37
- Boston Partners$30M
- Qube Research & Technologies Ltd$21M
- FORT WASHINGTON INVESTMENT ADVISORS INC /OH/$19M
- AGF MANAGEMENT LTD$13M
- JANUS HENDERSON GROUP PLC$8M
- NEW YORK STATE TEACHERS RETIREMENT SYSTEM$6M
Largest adds
- BlackRock, Inc.$272M
- FRANKLIN RESOURCES INC$95M
- VANGUARD PORTFOLIO MANAGEMENT LLC$52M
- BARROW HANLEY MEWHINNEY & STRAUSS LLC$42M
- GEODE CAPITAL MANAGEMENT, LLC$31M
- AMERICAN CENTURY COMPANIES INC$29M
Largest trims
- ALGERT GLOBAL LLC$14M
- BARCLAYS PLC$10M
- BNP PARIBAS FINANCIAL MARKETS$6M
- SCHRODER INVESTMENT MANAGEMENT GROUP$6M
- BNP PARIBAS ASSET MANAGEMENT Holding S.A.$4M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$4M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 16,403,230 | $665M | 16.4% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 7,926,938 | $321M | 7.9% | 2026-Q2 |
| STATE STREET CORP trimmed | 4,994,403 | $202M | 5.0% | 2026-Q2 |
| BROWN ADVISORY INC trimmed | 4,967,307 | $201M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 4,485,268 | $182M | 4.5% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 4,023,994 | $163M | 4.0% | 2026-Q2 |
| EARNEST PARTNERS LLC trimmed | 3,547,295 | $144M | 3.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 3,546,908 | $144M | 3.5% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 3,228,635 | $131M | 3.2% | 2026-Q2 |
| Morgan Stanley Institutional Investment Advisors LLC trimmed | 3,066,015 | $124M | 3.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 3,060,961 | $124M | 3.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,839,554 | $115M | 2.8% | 2026-Q2 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC added | 2,272,949 | $92M | 2.3% | 2026-Q2 |
| Greenhouse Funds LLLP trimmed | 1,896,343 | $77M | 1.9% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP trimmed | 1,849,926 | $75M | 1.8% | 2026-Q2 |
| REINHART PARTNERS, LLC. new | 1,648,423 | $67M | 1.6% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 1,606,095 | $65M | 1.6% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,371,471 | $56M | 1.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,339,591 | $54M | 1.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new | 1,330,080 | $54M | 1.3% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,320,910 | $54M | 1.3% | 2026-Q2 |
| MORGAN STANLEY added | 1,207,487 | $49M | 1.2% | 2026-Q2 |
| Bank of New York Mellon Corp added | 1,126,793 | $46M | 1.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,076,557 | $44M | 1.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 932,192 | $38M | 0.9% | 2026-Q2 |
| Ranger Investment Management, L.P. trimmed | 777,643 | $32M | 0.8% | 2026-Q2 |
| Goehring & Rozencwajg Associates, LLC added | 775,476 | $31M | 0.8% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 757,311 | $31M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 711,899 | $29M | 0.7% | 2026-Q2 |
| Old West Investment Management, LLC trimmed | 693,549 | $28M | 0.7% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 666,525 | $27M | 0.7% | 2026-Q2 |
| Invesco Ltd. added | 638,880 | $26M | 0.6% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 635,141 | $26M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 593,561 | $24M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 500,375 | $20M | 0.5% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 485,013 | $20M | 0.5% | 2026-Q2 |
| Boston Trust Walden Corp trimmed | 464,819 | $19M | 0.5% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 449,040 | $18M | 0.4% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 421,475 | $17M | 0.4% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 399,661 | $16M | 0.4% | 2026-Q2 |
| STOREBRAND ASSET MANAGEMENT AS | 366,188 | $15M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 364,827 | $15M | 0.4% | 2026-Q2 |
| FMR LLC added | 349,342 | $14M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 342,697 | $14M | 0.3% | 2026-Q2 |
| KEATING INVESTMENT COUNSELORS INC trimmed | 333,778 | $14M | 0.3% | 2026-Q2 |
| Granite Investment Partners, LLC added | 328,414 | $13M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 314,092 | $13M | 0.3% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 310,197 | $13M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 307,461 | $12M | 0.3% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL trimmed | 303,898 | $12M | 0.3% | 2026-Q2 |
| Sagefield Capital LP added | 284,724 | $12M | 0.3% | 2026-Q2 |
| HENNESSY ADVISORS INC trimmed | 267,086 | $11M | 0.3% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 258,066 | $10M | 0.3% | 2026-Q2 |
| UBS Group AG trimmed | 254,309 | $10M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 246,569 | $10M | 0.2% | 2026-Q2 |
| Aristotle Capital Boston, LLC trimmed | 245,180 | $10M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 242,503 | $10M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 236,766 | $10M | 0.2% | 2026-Q2 |
| Curi Capital, LLC added | 208,552 | $8M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 208,057 | $8M | 0.2% | 2026-Q2 |
| Archon Capital Management LLC | 208,000 | $8M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 202,234 | $7M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 199,448 | $8M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 196,196 | $8M | 0.2% | 2026-Q2 |
| GABELLI FUNDS LLC added | 194,079 | $8M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 162,283 | $7M | 0.2% | 2026-Q2 |
| Manatuck Hill Partners, LLC | 160,600 | $7M | 0.2% | 2026-Q2 |
| Jupiter Topco LLC new | 156,318 | $6M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 154,688 | $6M | 0.2% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 151,463 | $6M | 0.2% | 2026-Q2 |
| LEUTHOLD GROUP, LLC trimmed | 142,936 | $6M | 0.1% | 2026-Q2 |
| Empowered Funds, LLC added | 134,103 | $5M | 0.1% | 2026-Q2 |
| Concurrent Investment Advisors, LLC added | 131,457 | $5M | 0.1% | 2026-Q2 |
| Cannell & Spears LLC trimmed | 121,769 | $5M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 116,278 | $5M | 0.1% | 2026-Q2 |
| Vident Advisory, LLC added | 106,691 | $4M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 104,778 | $4M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 104,689 | $4M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 102,088 | $4M | 0.1% | 2026-Q2 |
| ISTHMUS PARTNERS, LLC trimmed | 95,786 | $4M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 95,768 | $4M | 0.1% | 2026-Q2 |
| EFG International AG trimmed | 91,994 | $4M | 0.1% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 90,020 | $4M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 79,314 | $3M | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC added | 78,820 | $3M | 0.1% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 76,280 | $3M | 0.1% | 2026-Q2 |
| Creative Planning added | 74,796 | $3M | 0.1% | 2026-Q2 |
| Glenorchy Capital Ltd added | 74,354 | $3M | 0.1% | 2026-Q2 |
| Legato Capital Management LLC added | 72,601 | $3M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 72,139 | $3M | 0.1% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. trimmed | 71,302 | $3M | 0.1% | 2026-Q2 |
| OPPENHEIMER ASSET MANAGEMENT INC. added | 70,143 | $3M | 0.1% | 2026-Q2 |
| GeoSphere Capital Management, LLC trimmed | 69,689 | $3M | 0.1% | 2026-Q2 |
| Annex Advisory Services, LLC added | 67,302 | $3M | 0.1% | 2026-Q2 |
| Edgestream Partners, L.P. trimmed | 65,581 | $3M | 0.1% | 2026-Q2 |
| Pathstone Holdings, LLC trimmed | 65,026 | $3M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC added | 62,023 | $3M | 0.1% | 2026-Q2 |
| JENNISON ASSOCIATES LLC added | 60,963 | $2M | 0.1% | 2026-Q2 |
| Integrated Quantitative Investments LLC trimmed | 59,747 | $2M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 58,718 | $2M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.