Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in OII held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 16.4M | $664.7M | +0.3% | 16.481% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.9M | $321.2M | +4.6% | 7.964% | 0.01% |
| 3 | STATE STREET CORP | 5.0M | $202.4M | -0.8% | 5.018% | 0.00% |
| 4 | BROWN ADVISORY INC | 5.0M | $201.3M | -14.2% | 4.991% | 0.31% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 4.5M | $181.7M | +0.1% | 4.506% | 0.00% |
| 6 | AMERICAN CENTURY COMPANIES INC | 4.0M | $163.1M | +6.8% | 4.043% | 0.07% |
| 7 | EARNEST PARTNERS LLC | 3.5M | $143.7M | -3.7% | 3.564% | 0.52% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 3.5M | $143.7M | +2.5% | 3.564% | 0.03% |
| 9 | Neuberger Berman Group LLC | 3.2M | $130.8M | +0.3% | 3.244% | 0.04% |
| 10 | Morgan Stanley Institutional Investment Advisors LLC | 3.1M | $124.2M | -11.2% | 3.080% | 11.60% |
| 11 | FRANKLIN RESOURCES INC | 3.1M | $124.0M | +269.5% | 3.075% | 0.03% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 2.8M | $115.1M | +19.5% | 2.853% | 0.01% |
| 13 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | 2.3M | $92.1M | +60.0% | 2.284% | 0.28% |
| 14 | Greenhouse Funds LLLP | 1.9M | $76.8M | -6.7% | 1.905% | 3.93% |
| 15 | VAN ECK ASSOCIATES CORP | 1.8M | $75.0M | -10.3% | 1.859% | 0.05% |
| 16 | REINHART PARTNERS, LLC. | 1.6M | $66.8M | — | 1.656% | 1.53% |
| 17 | LOOMIS SAYLES & CO L P | 1.6M | $65.1M | -5.5% | 1.614% | 0.08% |
| 18 | NORTHERN TRUST CORP | 1.4M | $55.6M | +8.2% | 1.378% | 0.01% |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3M | $54.3M | -3.1% | 1.346% | 0.01% |
| 20 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.3M | $53.9M | — | 1.336% | 0.08% |
| 21 | MORGAN STANLEY | 1.2M | $48.9M | +16.1% | 1.213% | 0.00% |
| 22 | Bank of New York Mellon Corp | 1.1M | $45.7M | +49.2% | 1.132% | 0.01% |
| 23 | GOLDMAN SACHS GROUP INC | 1.1M | $43.6M | +7.7% | 1.082% | 0.00% |
| 24 | ROYAL BANK OF CANADA | 932K | $37.8M | -11.1% | 0.937% | 0.01% |
| 25 | Ranger Investment Management, L.P. | 778K | $31.5M | -2.4% | 0.781% | 1.99% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in OII — a direct measure of their conviction.
Filings activity in OII during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new OII position in Q2 2026
Institutions that fully closed their OII position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 382 | +3.0% | 105.06% | +2.48 pp | $4.14B | +19% |
| Q1 2026 | 371 | +20% | 102.58% | +1.66 pp | $3.48B | +49% |
| Q4 2025 | 310 | +4.4% | 100.92% | +4.44 pp | $2.34B | +1.3% |
| Q3 2025 | 297 | +4.2% | 96.48% | +0.43 pp | $2.31B | +20% |
| Q2 2025 | 285 | +1.8% | 96.05% | 0.19 pp | $1.92B | 3.2% |
| Q1 2025 | 280 | 0.7% | 96.24% | 4.77 pp | $1.98B | 19% |
| Q4 2024 | 282 | +11% | 101.01% | +0.02 pp | $2.46B | +4.7% |
| Q3 2024 | 253 | — | 100.99% | — | $2.35B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying OII stock.
Based on Q2 2026 13F filings, institutional ownership of Oceaneering International, Inc. stands at 105.1%, held across 382 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OII, with approximately 16,403,230 shares worth $0.66B as of Q2 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of OII.
Our composite Smart Money Score for OII is 48 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
58 institutions opened new positions in OII during Q2 2026, while 51 fully exited. 267 added to existing positions and 46 trimmed.
OII institutional ownership rose by 2.48 percentage points quarter-over-quarter, with a net change of +11 holders.
The top 10 institutions account for 55.0% of all reported 13F value in OII, and the top 25 account for 78.8%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Oceaneering International, Inc. (OII) Institutional Ownership