$OSG

$4.77 -$0.05 (1.04%) Close

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

Ownership

13F as of Q2 2026 · 45.1M shares outstanding

Who owns OSG?

By type of holder

Institutions 66.4% Insiders 4.5% Everyone else 29.1%

Concentration Top 10 holders own 34.8%

BlackRock, Inc. 10.2% · Western Standard LLC 5.0%

Institutional ownership

66.4%

-5.8 pts vs last qtr

Institutional holders

146

-2 vs last qtr

Net shares bought

−2.6M

by institutions in Q2 2026

New / sold out

36 / 38

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +654.7K
Zacks Investment Management NEW +590.4K

Biggest sellers in Q2 2026

Wolf Hill Capital Management, LP −990.1K
Gendell Jeffrey L −919.1K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Octave Specialty Group Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+4.0%

+0.44% a year

Each share's claim on the business

−3.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$60.4M vs $101M

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+ years47% 3–5 years7% 1–3 years21% Under 1 year25%

Quarterly turnover

18.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting OSG on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	4.6M	10.15%	+654.7K (+16.7%)	≤2021	0.0%
Shares held by quarter Peak holding8.0M (Q4'24) Change over 8 quarters−3.1M Share of the company10.150% BlackRock, Inc.'s full portfolio →
WS Western Standard LLC	2.2M	4.99%	Unchanged	Q3 '25	4.8%
Shares held by quarter Peak holding2.6M (Q3'25) Change over 8 quarters+2.0M Share of the company4.990% Western Standard LLC's full portfolio →

BlackRock, Inc.

4.6M

% of company

10.15%

Change vs last qtr

+654.7K (+16.7%)

Held since

≤2021

Western Standard LLC

2.2M

% of company

4.99%

Change vs last qtr

Unchanged

Held since

Q3 '25

28 more super investors behind a free account

See every manager holding Octave Specialty Group Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting OSG on Form N-PORT; together they hold 21.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$8.64M	1.4M	3.07%	0.00%	June 30, 2026
TA Third Avenue Small-Cap Value Fund Third Avenue Trust	$7.23M	1.3M	2.97%	3.33%	July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$8.64M

% of company

3.07%

% of the fund

0.00%

As of

June 30, 2026

Third Avenue Small-Cap Value Fund

Third Avenue Trust

Position value

$7.23M

% of company

2.97%

% of the fund

3.33%

As of

July 31, 2026

23 more funds behind a free account

See every fund holding Octave Specialty Group 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
LC LeBlanc Claude Insider	1.1M	2.38%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.380% LeBlanc Claude's insider activity →
TD Trick David Insider	267.1K	0.59%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.590% Trick David's insider activity →

LeBlanc Claude

Insider

1.1M

% of company

2.38%

Change vs last qtr

—

Held since

—

Trick David

Insider

267.1K

% of company

0.59%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Octave Specialty Group Inc.

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