$OII

$41.61 +$0.14 (0.34%) Close

$OII Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 99.4M shares outstanding

Who owns OII?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 56.5%

BlackRock, Inc. 16.5% · Vanguard Portfolio Management LLC 8.0%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

376

+8 vs last qtr

Net shares bought

+2.5M

by institutions in Q2 2026

New / sold out

67 / 59

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Franklin Resources Inc +2.2M
Reinhart Partners, LLC. NEW +1.6M

Biggest sellers in Q2 2026

Boston Partners SOLD OUT −854.9K
Brown Advisory Inc −821.3K

Who is planning to sell?

Notices of proposed sale, last 12 months

$14.4M

23 notices from 15 people

Shares covered

379.7K

0.38% of the company

Arranged in advance

14%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Mcdonald Martin J Officer $2.69M
Curtis Alan R Former officer $2.69M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+2.9%

+0.32% a year

Each share's claim on the business

−2.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$60.3M vs $119M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years69% 3–5 years13% 1–3 years5% Under 1 year13%

Quarterly turnover

9.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting OII on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	16.4M	16.50%	+54.4K (+0.3%)	≤2021	0.0%
Shares held by quarter Peak holding17.1M (Q4'24) Change over 8 quarters−67.5K Share of the company16.500% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	7.9M	7.97%	+348.0K (+4.6%)	≤2021	0.0%
Shares held by quarter Peak holding7.9M (Q2'26) Change over 8 quarters+7.9M Share of the company7.970% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

16.4M

% of company

16.50%

Change vs last qtr

+54.4K (+0.3%)

Held since

≤2021

Vanguard Portfolio Management LLC

7.9M

% of company

7.97%

Change vs last qtr

+348.0K (+4.6%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Oceaneering International Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting OII on Form N-PORT; together they hold 60.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$244M	6.0M	6.04%	0.22%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$128M	3.2M	3.18%	0.01%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$244M

% of company

6.04%

% of the fund

0.22%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$128M

% of company

3.18%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Oceaneering International Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
LR Larson Roderick A. Insider	642.7K	0.65%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.650% Larson Roderick A.'s insider activity →
WS Webster Steven A Insider	165.9K	0.17%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.170% Webster Steven A's insider activity →

Larson Roderick A.

Insider

642.7K

% of company

0.65%

Change vs last qtr

—

Held since

—

Webster Steven A

Insider

165.9K

% of company

0.17%

Change vs last qtr

—

Held since

—

20 more holders behind a free account

See every insider and 5%+ holder of Oceaneering International Inc.

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