OCEANEERING INTL INC (OII) Institutional Shareholders
OCEANEERING INTL INC (OII) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $3.48B in OII holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OII tracked by InsiderSet, reporting ownership valued at approximately $579.89M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $797.50M, representing an estimated gain of +37.52% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 58% of the total disclosed OII value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Brown Advisory Inc, and several other long-term asset managers with concentrated positions in OCEANEERING INTL INC (OII).
This page ranks the largest institutional OII shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
358
Total Reported Value
$3.48B
Largest Holder
Blackrock, Inc.
Largest Position
$579.89M
Insider Transactions (90d)
4
Latest Filing Quarter
Q2 2026
New Institutional Positions
90
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 16,348,842 | $579,893,415 | $797,496,513 | +$217,603,098 | +37.52% | |
| Vanguard Portfolio Management Llc | 0.01% | 7,578,921 | $268,824,328 | $369,699,766 | +$100,875,438 | +37.52% | |
| Brown Advisory Inc | 0.34% | 5,788,601 | $205,321,688 | $282,367,957 | +$77,046,269 | +37.52% | |
| State Street Corp | 0.01% | 5,034,196 | $178,562,932 | $245,568,081 | +$67,005,149 | +37.52% | |
| Vanguard Capital Management Llc | 0.00% | 4,478,763 | $158,861,724 | $218,474,059 | +$59,612,335 | +37.52% | |
| American Century Companies Inc | 0.07% | 3,766,674 | $133,603,927 | $183,738,358 | +$50,134,431 | +37.52% | |
| Earnest Partners Llc | 0.54% | 3,684,313 | $130,682,582 | $179,720,788 | +$49,038,206 | +37.52% | |
| Dimensional Fund Advisors Lp | 0.03% | 3,461,749 | $122,780,112 | $168,864,116 | +$46,084,004 | +37.53% | |
| Morgan Stanley Institutional Investment Advisors Llc | 11.81% | 3,453,005 | $122,478,102 | $168,437,584 | +$45,959,482 | +37.52% | |
| Neuberger Berman Group Llc | 0.09% | 3,218,259 | $114,151,647 | $156,986,674 | +$42,835,027 | +37.52% | |
| Geode Capital Management, Llc | 0.01% | 2,376,461 | $84,308,259 | $115,923,768 | +$31,615,509 | +37.50% | |
| Greenhouse Funds Lllp | 3.42% | 2,032,489 | $72,092,385 | $99,144,813 | +$27,052,428 | +37.52% | |
| Reinhart Partners, Llc. | 1.53% | 1,648,423 | $66,794,700 | $80,410,074 | +$13,615,374 | +20.38% | |
| Loomis Sayles & Co L P | 0.08% | 1,700,289 | $60,309,251 | $82,940,097 | +$22,630,846 | +37.52% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.17% | 1,420,954 | $50,401,238 | $69,314,136 | +$18,912,898 | +37.52% | |
| Charles Schwab Investment Management Inc | 0.01% | 1,383,124 | $49,059,408 | $67,468,789 | +$18,409,381 | +37.52% | |
| Northern Trust Corp | 0.01% | 1,267,928 | $44,973,405 | $61,849,528 | +$16,876,123 | +37.52% | |
| Royal Bank Of Canada | 0.01% | 1,048,210 | $37,180,000 | $51,131,684 | +$13,951,684 | +37.52% | |
| Morgan Stanley | 0.00% | 1,040,333 | $36,900,630 | $50,747,444 | +$13,846,814 | +37.52% | |
| Goldman Sachs Group Inc | 0.00% | 999,891 | $35,466,134 | $48,774,683 | +$13,308,549 | +37.52% | |
| Boston Partners | 0.03% | 854,941 | $30,335,854 | $41,704,022 | +$11,368,168 | +37.47% | |
| Franklin Resources Inc | 0.01% | 828,372 | $29,382,354 | $40,407,986 | +$11,025,632 | +37.52% | |
| Ranger Investment Management, L.P. | 2.04% | 796,595 | $28,255,225 | $38,857,904 | +$10,602,679 | +37.52% | |
| Fisher Asset Management, Llc | 0.01% | 792,269 | $28,101,780 | $38,646,882 | +$10,545,102 | +37.52% | |
| Bank Of New York Mellon Corp | 0.00% | 755,271 | $26,789,460 | $36,842,119 | +$10,052,659 | +37.52% | |
| Goehring & Rozencwajg Associates, Llc | 1.36% | 713,586 | $25,310,895 | $34,808,725 | +$9,497,830 | +37.52% | |
| Invesco Ltd. | 0.00% | 701,665 | $24,888,057 | $34,227,219 | +$9,339,162 | +37.52% | |
| Old West Investment Management, Llc | 2.68% | 697,193 | $24,729,435 | $34,009,075 | +$9,279,640 | +37.52% | |
| Vanguard Fiduciary Trust Co | 0.01% | 690,608 | $24,495,866 | $33,687,858 | +$9,191,992 | +37.52% | |
| Federated Hermes, Inc. | 0.04% | 688,220 | $24,411,164 | $33,571,372 | +$9,160,208 | +37.52% | |
| Massachusetts Financial Services Co | 0.01% | 681,600 | $24,176,352 | $33,248,448 | +$9,072,096 | +37.52% | |
| Schroder Investment Management Group | 0.02% | 604,219 | $21,431,648 | $29,473,803 | +$8,042,155 | +37.52% | |
| Qube Research & Technologies Ltd | 0.03% | 588,323 | $20,867,817 | $28,698,396 | +$7,830,579 | +37.52% | |
| Principal Financial Group Inc | 0.01% | 585,358 | $20,762,648 | $28,553,763 | +$7,791,115 | +37.52% | |
| Boston Trust Walden Corp | 0.14% | 464,819 | $18,834,465 | $22,673,871 | +$3,839,406 | +20.39% | |
| Panagora Asset Management Inc | 0.06% | 482,776 | $17,124,065 | $23,549,813 | +$6,425,748 | +37.52% | |
| Sei Investments Co | 0.01% | 440,691 | $15,631,312 | $21,496,907 | +$5,865,595 | +37.52% | |
| First Trust Advisors Lp | 0.01% | 435,176 | $15,435,692 | $21,227,885 | +$5,792,193 | +37.52% | |
| Nuveen, Llc | 0.00% | 435,150 | $15,434,771 | $21,226,617 | +$5,791,846 | +37.52% | |
| Aqr Capital Management Llc | 0.01% | 392,150 | $13,909,561 | $19,129,077 | +$5,219,516 | +37.52% | |
| Keating Investment Counselors Inc | 3.71% | 333,778 | $13,524,685 | $16,281,691 | +$2,757,006 | +20.38% | |
| Agf Management Ltd | 0.06% | 365,938 | $12,979,821 | $17,850,456 | +$4,870,635 | +37.52% | |
| Public Sector Pension Investment Board | 0.04% | 356,983 | $12,662,187 | $17,413,631 | +$4,751,444 | +37.52% | |
| Fmr Llc | 0.00% | 345,532 | $12,256,009 | $16,855,051 | +$4,599,042 | +37.52% | |
| Gamco Investors, Inc. Et Al | 0.12% | 338,298 | $11,999,430 | $16,502,176 | +$4,502,746 | +37.52% | |
| Granite Investment Partners, Llc | 0.71% | 327,053 | $11,600,570 | $15,953,645 | +$4,353,075 | +37.52% | |
| Ubs Group Ag | 0.00% | 315,828 | $11,202,419 | $15,406,090 | +$4,203,671 | +37.52% | |
| Hennessy Advisors Inc | 0.35% | 267,086 | $10,822,325 | $13,028,455 | +$2,206,130 | +20.38% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 299,573 | $10,625,854 | $14,613,171 | +$3,987,317 | +37.52% | |
| Barclays Plc | 0.00% | 298,709 | $10,595,209 | $14,571,025 | +$3,975,816 | +37.52% |
Frequently asked questions about OII
Who owns the most OII stock?
The largest holders of OII are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for OCEANEERING INTL INC (OII).
Is OII widely held by superinvestors?
Many widely followed stocks like OII appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly OII is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.