Octave Specialty OSG Institutional Ownership

NYSE OSG

$4.55 +0.04 (+0.89%)

At close: Aug 21, 2026 · 4:00 PM EDT

Institutions by Trading Activity

147 Institutions

Increased 70 47.6%

Unchanged 20 13.6%

Reduced 57 38.8%

Ownership Statistics

13F · as of 31 Mar, 2026

Institutional Ownership

71.83%

▼-3.83 pp QoQ

Shares Held by Institutions

32.54Mn

of 45.30Mn outstanding

▲+1.99% QoQ

Shares Outstanding

45.30Mn

12.76Mn held outside 13F filers

Institutional Investors

147

filed 13F for Mar 2026

▲+4 vs prior quarter

Net Shares Added (QoQ)

+634.27K

accumulated since last quarter

Value of Holdings

$149.35Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 31 Mar, 2026

Octave Specialty Group Inc (NYSE:OSG) showed up in the 13F filings of 147 institutional investors as of March 2026.

Their combined ownership stood at 71.8% of outstanding shares in March 2026, down from 75.7% in December 2025.
Their total shares held in OSG increased 1.99% from the prior quarter, while the number of investors in Octave Specialty decreased 16.95% year over year.
Of these 147 funds, 70 grew their exposure to Octave Specialty, 57 cut back, and 20 maintained positions.
The aggregate institutional position in Octave Specialty amounted to 32.54Mn shares as of March 2026, up by 634.27K shares quarter on quarter, and down 8.37Mn shares year over year.
BlackRock, Inc. holds the largest position in OSG at 3.92Mn shares as of March 31, 2026, or 8.65% of shares outstanding.
Leading buyers of Octave Specialty shares for the quarter ending March 2026 were VANGUARD CAPITAL MANAGEMENT LLC (1.95Mn), PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. (699.07K), JACOBS LEVY EQUITY MANAGEMENT, INC (647.09K), THIRD AVENUE MANAGEMENT LLC (559.12K), RIHO Partners, LLC (546.57K).
The largest sales of OSG for the quarter ending March 2026 came from Goldman Sachs Group Inc (1.21Mn), JANE STREET GROUP, LLC (756.27K), Morgan Stanley (703.47K), Barclays Plc (623.47K), BlackRock, Inc. (570.67K).
Per Business Quant, the top 10 investors in OSG for the quarter ending March 2026 include BlackRock, Inc. (3.92Mn), Western Standard LLC (2.25Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.95Mn), PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. (1.59Mn), Wolf Hill Capital Management, LP (1.47Mn), GENDELL JEFFREY L (1.41Mn), THIRD AVENUE MANAGEMENT LLC (1.34Mn), DIMENSIONAL FUND ADVISORS LP (1.31Mn), Bain Capital Credit, LP (1.11Mn), MARSHALL WACE, LLP (1.07Mn).

Form 13F Holdings

147 Institutional Holders

Report period 31 Mar, 2026

Total shares held 32.54Mn

Of outstanding 71.83%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	3,917,798	8.65%	▼570,670	-12.71%	$18.22Mn
2	Western Standard LLC	0001517666	2,247,591	4.96%	▼257,036	-10.26%	$10.45Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,945,076	4.29%	▲1,945,076	0.00%	$9.04Mn
4	PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.	0001166152	1,592,587	3.52%	▲699,070	+78.24%	$7.41Mn
5	Wolf Hill Capital Management, LP	0001785988	1,470,334	3.25%	▼418,639	-22.16%	$6.84Mn
6	GENDELL JEFFREY L	0001056581	1,413,212	3.12%	▼156,260	-9.96%	$6.57Mn
7	THIRD AVENUE MANAGEMENT LLC	0001099281	1,341,211	2.96%	▲559,118	+71.49%	$6.24Mn
8	DIMENSIONAL FUND ADVISORS LP	0000354204	1,310,132	2.89%	▼375,495	-22.28%	$6.09Mn
9	Bain Capital Credit, LP	0001317947	1,108,012	2.45%	0	0.00%	$5.15Mn
10	MARSHALL WACE, LLP	0001318757	1,065,335	2.35%	▲316,763	+42.32%	$4.95Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,022,438	2.26%	▼2,109	-0.21%	$4.76Mn
12	State Street Corp	0000093751	941,404	2.08%	▼1,964	-0.21%	$4.38Mn
13	JACOBS LEVY EQUITY MANAGEMENT, INC	0000884414	884,272	1.95%	▲647,087	+272.82%	$4.11Mn
14	Nuveen, LLC	0001871926	800,253	1.77%	▼10,026	-1.24%	$3.72Mn
15	JANE STREET GROUP, LLC	0001595888	764,384	1.69%	▼756,270	-49.73%	$3.55Mn
16	Caption Management, LLC	0001706766	642,597	1.42%	▼428,497	-40.01%	$2.99Mn
17	Bracebridge Capital, LLC	0001426486	579,234	1.28%	0	0.00%	$2.69Mn
18	RIHO Partners, LLC	0002112884	546,569	1.21%	▲546,569	0.00%	$2.54Mn
19	CITADEL ADVISORS LLC	0001423053	431,809	0.95%	▲144,526	+50.31%	$2.01Mn
20	ESSEX INVESTMENT MANAGEMENT CO LLC	0000201772	418,203	0.92%	▲7,381	+1.80%	$1.94Mn

Showing 1 to 20 of 147 holders