Oceaneering International, Inc.
Oceaneering International, Inc. (OII) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · OII · as of Sep 30, 2025
Ownership Breakdown
306
Institutional Holders
▲ 14 vs Q2
$2.37B
Total Inst. Value
▲ $381.17M vs Q2
99.75M
Shares Outstanding
freeFloat 98.39%
95.58M
13F Shares Held
▼ 336,968 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
OII largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. oil & gas field services, nec | 15.67M | 15.58% | 15.58% | $388.28B | Nov 12, 2025 | ▼ 88.3K |
VANGUARD GROUP INC oil & gas field services, nec | 12.18M | 12.12% | 12.12% | $301.91B | Nov 7, 2025 | ▼ 208.1K |
BROWN ADVISORY INC oil & gas field services, nec | 7.70M | 7.66% | 7.66% | $190.86B | Nov 14, 2025 | ▲ 356.6K |
STATE STREET CORP oil & gas field services, nec | 4.43M | 4.41% | 4.41% | $109.82B | Nov 14, 2025 | ▼ 378.9K |
EARNEST PARTNERS LLC oil & gas field services, nec | 4.02M | 3.99% | 3.99% | $99.53B | Nov 14, 2025 | ▼ 202.7K |
AMERICAN CENTURY COMPANIES INC oil & gas field services, nec | 3.64M | 3.62% | 3.62% | $90.27B | Nov 12, 2025 | ▲ 272.7K |
NEUBERGER BERMAN GROUP LLC oil & gas field services, nec | 3.54M | 3.52% | 3.52% | $87.71B | Nov 12, 2025 | ▼ 81.7K |
DIMENSIONAL FUND ADVISORS LP oil & gas field services, nec | 3.29M | 3.27% | 3.27% | $81.43B | Nov 12, 2025 | ▲ 98.3K |
GREENHOUSE FUNDS LLLP oil & gas field services, nec | 2.49M | 2.48% | 2.48% | $61.75B | Nov 13, 2025 | — held |
GEODE CAPITAL MANAGEMENT, LLC oil & gas field services, nec | 2.25M | 2.24% | 2.24% | $55.84B | Nov 12, 2025 | ▲ 4.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+3.45M shares1
New Positions
first time holders24
Decreased
−2.29M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.16M
+3.45M / −2.29M
Net new holders
+1
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
OII insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
9
Buy transactions
3
Sell transactions
3.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
LARSON RODERICK A. President and CEO | May 18, 2026 | Sale | 5,000 | $38.27 | $191.4K | 397.3K | Form 4 ↗ |
Jenkins Roger W. director | May 15, 2026 | Award | 4,576 | — | — | 4.6K | Form 4 ↗ |
WEBSTER STEVEN A director | May 15, 2026 | Award | 4,576 | — | — | 165.9K | Form 4 ↗ |
Reinhardsen Jon Erik director | May 15, 2026 | Award | 4,576 | — | — | 101.2K | Form 4 ↗ |
Poddar Reema director | May 15, 2026 | Award | 4,576 | — | — | 23.0K | Form 4 ↗ |
MURPHY PAUL B JR director | May 15, 2026 | Award | 4,576 | — | — | 78.9K | Form 4 ↗ |
MCEVOY M KEVIN director | May 15, 2026 | Award | 6,729 | — | — | 137.1K | Form 4 ↗ |
GOODWIN DEANNA L director | May 15, 2026 | Award | 4,576 | — | — | 42.9K | Form 4 ↗ |
Beachy Karen H director | May 15, 2026 | Award | 4,576 | — | — | 27.4K | Form 4 ↗ |
BERRY WILLIAM B director | May 15, 2026 | Award | 4,576 | — | — | 101.2K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Oceaneering International, Inc. (OII) is primarily owned by institutional investors, who hold approximately 95.8% of total shares outstanding. Company insiders own approximately 1.61%, while retail and public investors account for the remaining 2.57%.
The largest institutional shareholder of Oceaneering International, Inc. is BLACKROCK, INC., holding approximately 15.67 million shares — equal to 15.58% of outstanding shares — as of September 30, 2025.
A total of 306 institutional investors currently hold OII stock, with a combined institutional value of approximately $2.37 billion as of the most recent 13F filing period.
Frequently asked questions
OII ownershipOceaneering International, Inc. (OII) is primarily owned by institutional investors, who hold approximately 95.8% of shares. The largest shareholder is BLACKROCK, INC. with a 15.58% stake. Company insiders hold 1.61%. Data sourced from SEC Form 13F as of September 30, 2025.