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Oceaneering International OII

US equityMarket cap rank #2177
$45.66 +$1.34 (+3.02%)
Market closed · Oct 5, 11:50 pm ET · Last extended-hours $45.00 -1.45%
Open$44.20
Prev close$44.32
Day range$43.95 – $46.50
Volume842.2K
Market cap$4.54B
P/E (TTM)13.2
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership106.0%-0.39 pts vs. prior quarter
Institutions holding444+0 vs. prior quarter
Insider trades (recent)15 buys / 35 sellsNet selling
Short interest7.57% of floatDays to cover 9.1 · as of 15 Sep 2026
Short-sale volume share22.0%5-day average of daily volume

Short-sale volume as % of daily volume

14%20%26%32%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$9.44M (5 inflow days, 15 outflow days).

The five largest holders on file together own 39.7% of shares outstanding.

Largest holders

  • BlackRock16.48%
  • Vanguard Portfolio Management, LLC7.96%
  • Vanguard Capital Management, LLC5.22%
  • State Street Global Advisors5.02%
  • Brown Advisory Incorporated4.99%
  • American Century Investment Management4.04%
  • EARNEST Partners, LLC3.56%
  • Dimensional Fund Advisors3.56%

By investor type

  • Mutual Fund97.42%
  • Hedge Fund4.10%
  • Public Company2.23%
  • Individual/Insider1.53%
  • Government Pension Fund1.29%
  • Private Company0.29%
  • Family Office/Trust0.23%
  • Insurance Company0.19%

Reported short interest has risen from 6.05% to 7.57% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 7,536,785 7.6% 9.1
31 Aug 2026 6,464,202 6.5% 6.4
14 Aug 2026 6,178,918 6.2% 8.8
31 Jul 2026 6,040,613 6.1% 4.3
15 Jul 2026 6,556,236 6.6% 7.6
30 Jun 2026 6,037,861 6.1% 3.6

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