Oceaneering International, Inc. (OII) Ownership
OII ownership summary
as of October 18, 2026- Institutions
- 108.2% of shares outstanding
- Insiders
- 1.28% of shares outstanding
- Shares outstanding
- 99.5M
- Float
- 98.0M shares available to trade
- Short interest
- 9.68% 6.9M shares short
- Days to cover
- 7.52 short interest up 7.1% vs prior month
- Institutions 108.18%
- Insiders 1.28%
OII top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 16.48% | 16.4M | $718.3M | +54,388 (+0.3%) | June 30, 2026 |
| 2 | Vanguard Portfolio Management, LLC | 7.96% | 7.9M | $347.1M | +348,017 (+4.6%) | June 30, 2026 |
| 3 | State Street Corp | 5.02% | 5.0M | $218.7M | −39,793 (−0.8%) | June 30, 2026 |
| 4 | Brown Advisory Holdings Inc | 4.99% | 5.0M | $217.5M | −821,294 (−14.2%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.51% | 4.5M | $196.4M | +6,505 (+0.1%) | June 30, 2026 |
| 6 | American Century Companies Inc | 4.04% | 4.0M | $176.2M | +257,320 (+6.8%) | June 30, 2026 |
| 7 | Earnest Partners LLC | 3.56% | 3.5M | $155.3M | −137,018 (−3.7%) | June 30, 2026 |
| 8 | Dimensional Fund Advisors, Inc. | 3.56% | 3.5M | $155.3M | +85,159 (+2.5%) | June 30, 2026 |
| 9 | Neuberger Berman Group LLC | 3.24% | 3.2M | $141.4M | +10,376 (+0.3%) | June 30, 2026 |
| 10 | Morgan Stanley Institutional Investment Advisors LLC | 3.08% | 3.1M | $134.3M | −386,990 (−11.2%) | June 30, 2026 |
| 11 | Franklin Templeton Inc | 3.08% | 3.1M | $134.0M | +2.2M (+269.5%) | June 30, 2026 |
| 12 | Geode Capital Management, LLC | 2.85% | 2.8M | $124.3M | +463,093 (+19.5%) | June 30, 2026 |
| 13 | Barrow Hanley Mewhinney & Strauss LLC | 2.28% | 2.3M | $99.5M | +851,995 (+60.0%) | June 30, 2026 |
| 14 | Greenhouse Funds LLLP | 1.91% | 1.9M | $83.0M | −136,146 (−6.7%) | June 30, 2026 |
| 15 | Van Eck Associates Corporation | 1.86% | 1.8M | $81.0M | −211,561 (−10.3%) | June 30, 2026 |
| 16 | Reinhart Mahoney Capital Management Inc | 1.66% | 1.7M | $72.3M | +2,053 (+0.1%) | September 30, 2026 |
| 17 | Loomis, Sayles & Company LP | 1.61% | 1.6M | $70.3M | −94,194 (−5.5%) | June 30, 2026 |
| 18 | Northern Trust Corp | 1.38% | 1.4M | $60.1M | +103,543 (+8.2%) | June 30, 2026 |
| 19 | Charles Schwab Investment Management Inc | 1.35% | 1.3M | $58.7M | −43,533 (−3.1%) | June 30, 2026 |
| 20 | Delaware Management Holdings Inc | 1.34% | 1.3M | $58.2M | +1.3M (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 5.7M shares and 8 cut 1.9M.
OII top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.96% | 5.9M | $259.6M | +1,305 (+0.0%) | September 30, 2026 |
| 2 | Avantis US Small Cap Value ETF | 3.77% | 3.8M | $164.4M | +5,160 (+0.1%) | September 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.19% | 3.2M | $138.9M | −4,279 (−0.1%) | August 31, 2026 |
| 4 | iShares Russell 2000 ETF | 2.63% | 2.6M | $114.5M | −30,144 (−1.1%) | September 30, 2026 |
| 5 | Vanguard Small Cap Index | 2.25% | 2.2M | $98.2M | −53,852 (−2.3%) | September 30, 2026 |
| 6 | Neuberger Genesis Inv | 1.72% | 1.7M | $74.8M | −227,537 (−11.8%) | September 30, 2026 |
| 7 | VanEck Oil Services ETF | 1.26% | 1.3M | $54.8M | — | September 30, 2026 |
| 8 | Vanguard MStar Small Cap Growth Indx Inv | 1.25% | 1.2M | $54.6M | −70,427 (−5.3%) | September 30, 2026 |
| 9 | Harbor Small Cap Value Instl | 1.19% | 1.2M | $51.8M | −194,047 (−14.1%) | September 30, 2026 |
| 10 | Franklin Small Cap Value A | 1.19% | 1.2M | $51.8M | −590,041 (−33.3%) | August 31, 2026 |
| 11 | Fidelity Small Cap Index | 1.11% | 1.1M | $48.2M | +9,208 (+0.8%) | July 31, 2026 |
| 12 | Franklin DynaTech Fund A | 1.00% | 1.0M | $43.8M | — | August 31, 2026 |
| 13 | T. Rowe Price New Horizons | 0.93% | 922K | $40.4M | — | September 30, 2026 |
| 14 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 905K | $39.6M | — | September 30, 2026 |
| 15 | iShares Russell 2000 Growth ETF | 0.87% | 862K | $37.8M | −1,092 (−0.1%) | September 30, 2026 |
| 16 | Invesco S&P SmallCap Momentum ETF | 0.81% | 805K | $35.3M | — | September 30, 2026 |
| 17 | Loomis Sayles Small Cap Growth Instl | 0.79% | 786K | $34.4M | +53,197 (+7.3%) | August 31, 2026 |
| 18 | Vanguard Explorer Inv | 0.68% | 675K | $29.5M | +147,983 (+28.1%) | June 30, 2026 |
| 19 | Vanguard Tax-Managed Small Cap Adm | 0.68% | 672K | $29.4M | −16,061 (−2.3%) | September 30, 2026 |
| 20 | Principal SmallCap Growth I Instl | 0.66% | 659K | $28.9M | +31,037 (+4.9%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
OII insider transactions
latest 10| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-26 | Benjamin Laura | Sell | $36.88 | 5,106 | $188,309 |
| 2026-02-26 | Holly Kriendler | Sell | $37.31 | 5,798 | $216,323 |
| 2026-02-25 | Benjamin Laura | Sell | $37.51 | 33,176 | $1.2M |
| 2026-02-25 | Christopher J Dyer | Sell | $38.08 | 6,000 | $228,480 |
| 2026-02-25 | Earl Childress | Sell | $37.41 | 22,518 | $842,398 |
| 2026-02-25 | Holly Kriendler | Sell | $37.73 | 19,007 | $717,134 |
| 2026-02-25 | Jennifer Fremont Simons | Sell | $38.96 | 10,284 | $400,665 |
| 2026-02-25 | Karen H Beachy | Sell | $37.41 | 9,800 | $366,618 |
| 2026-01-05 | Jennifer Fremont Simons | Sell | $26.35 | 29,155 | $768,234 |
| 2025-08-27 | Alan R Curtis | Sell | $24.36 | 14,840 | $361,502 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
OII shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns OII
Institutional investors own 108.2% of Oceaneering International's shares and insiders 1.28%. The largest holder is BlackRock Inc with 16.48% of the shares (16.4M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 9.68% of the float, or 7.52 days of average trading volume. The share count fell 3.0% since 2014.
Related: OII analyst forecast, OII key metrics. See the OII stock overview for the latest quote and news.
OII ownership FAQ
Who owns the most Oceaneering International stock?
The largest shareholders of Oceaneering International are BlackRock Inc (16.48%), Vanguard Portfolio Management, LLC (7.96%), State Street Corp (5.02%), Brown Advisory Holdings Inc (4.99%), Vanguard Capital Management, LLC (4.51%).
What percentage of Oceaneering International is owned by institutions?
Institutions hold 108.2% of Oceaneering International's shares outstanding; insiders hold 1.28%.
Which funds own Oceaneering International?
The largest fund holders of Oceaneering International are iShares Core S&P Small-Cap ETF (5.96%), Avantis US Small Cap Value ETF (3.77%), Vanguard MStar Total Stk Mkt Idx Invest (3.19%), iShares Russell 2000 ETF (2.63%), Vanguard Small Cap Index (2.25%).
What is Oceaneering International's short interest?
6.9M shares of Oceaneering International were sold short, 9.68% of the float; at the average daily volume it would take 7.52 days to cover.
Are insiders buying or selling Oceaneering International?
Of the latest 10 reported insider transactions in Oceaneering International (since August 27, 2025), 0 were purchases and 10 were sales.
How many shares of Oceaneering International are outstanding?
Oceaneering International has 99.5M shares outstanding, of which 98.0M are in the public float.