Oceaneering International, Inc. (OII) ownership: Top institutional holder: BlackRock, Inc. ($579.89M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 16348842.00 | $579.89M | 2026-03-31 |
| VANGUARD GROUP INC | 12371147.00 | $297.28M | 2025-12-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7578921.00 | $268.82M | 2026-03-31 |
| BROWN ADVISORY INC | 5788601.00 | $205.32M | 2026-03-31 |
| STATE STREET CORP | 5034196.00 | $178.56M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4478763.00 | $158.86M | 2026-03-31 |
| AMERICAN CENTURY COMPANIES INC | 3766674.00 | $133.60M | 2026-03-31 |
| EARNEST PARTNERS LLC | 3684313.00 | $130.68M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-18 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 | |
| Sell | null | 2026-05-15 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.