Company · Ownership research

OCTAVE SPECIALTY GROUP INC OSG

CIK 0000874501 · CUSIP 023139884

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 023139884 (OSG), not CUSIP 023139904 (OSG), CUSIP 023139954 (OSG), and does not merge CUSIPs.

This page lists the top 20 of 148 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$18.22M 3,917,798 shares	0.00%	-570.67K(-12.70%)Reduced	SEC filing ↗ May 13, 2026	▾
02	Western Standard LLC CIK 1517666 · View history	$10.45M 2,247,591 shares	5.50%	-257.04K(-10.30%)Reduced	SEC filing ↗ May 5, 2026	▾
03	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$9.04M 1,945,076 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
04	Prescott Group Capital Management, L.L.C. CIK 1166152 · View history	$7.41M 1,592,587 shares	0.74%	+699.07K(+78.20%)Added	SEC filing ↗ May 7, 2026	▾
05	Wolf Hill Capital Management, LP CIK 1785988 · View history	$6.84M 1,470,334 shares	0.97%	-418.64K(-22.20%)Reduced	SEC filing ↗ May 14, 2026	▾
06	GENDELL JEFFREY L CIK 1056581 · View history	$6.57M 1,413,212 shares	0.09%	-156.26K(-10.00%)Reduced	SEC filing ↗ May 15, 2026	▾
07	THIRD AVENUE MANAGEMENT LLC CIK 1099281 · View history	$6.24M 1,341,211 shares	1.01%	+559.12K(+71.50%)Added	SEC filing ↗ May 13, 2026	▾
08	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$6.09M 1,310,132 shares	0.00%	-375.50K(-22.30%)Reduced	SEC filing ↗ May 7, 2026	▾
09	Bain Capital Credit, LP CIK 1317947 · View history	$5.15M 1,108,012 shares	1.70%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2026	▾
10	MARSHALL WACE, LLP CIK 1318757 · View history	$4.95M 1,065,335 shares	0.01%	+316.76K(+42.30%)Added	SEC filing ↗ May 15, 2026	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$4.76M 1,022,438 shares	0.00%	-2.11K(-0.20%)Reduced	SEC filing ↗ May 15, 2026	▾
12	STATE STREET CORP CIK 93751 · View history	$4.38M 941,404 shares	0.00%	-1.96K(-0.20%)Reduced	SEC filing ↗ May 15, 2026	▾
13	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$4.11M 884,272 shares	0.02%	+647.09K(+272.80%)Added	SEC filing ↗ May 15, 2026	▾
14	Nuveen, LLC CIK 1871926 · View history	$3.72M 800,253 shares	0.00%	-10.03K(-1.20%)Reduced	SEC filing ↗ Apr 30, 2026	▾
15	JANE STREET GROUP, LLC CIK 1595888 · View history	$3.55M 764,384 shares	0.00%	-756.27K(-49.70%)Reduced	SEC filing ↗ May 12, 2026	▾
16	Caption Management, LLC CIK 1706766 · View history	$2.99M 642,597 shares	0.14%	-428.50K(-40.00%)Reduced	SEC filing ↗ May 15, 2026	▾
17	Bracebridge Capital, LLC CIK 1426486 · View history	$2.69M 579,234 shares	0.48%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
18	RIHO Partners, LLC CIK 2112884 · Amended · View history	$2.54M 546,569 shares	1.60%	+546.57KNew	SEC filing ↗ May 18, 2026	▾
19	CITADEL ADVISORS LLC CIK 1423053 · View history	$2.01M 431,809 shares	0.00%	+144.53K(+50.30%)Added	SEC filing ↗ May 15, 2026	▾
20	ESSEX INVESTMENT MANAGEMENT CO LLC CIK 201772 · View history	$1.94M 418,203 shares	0.31%	+7.38K(+1.80%)Added	SEC filing ↗ May 11, 2026	▾

Showing 20 / 148 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

148

Cancelled or null records excluded

Disclosed shares

32,538,881

Not deduplicated across managers

Disclosed value

$151.41M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

OCTAVE SPECIALTY GROUP INC · Q1 2026

Explore all 148 reporting institutions.

This page includes 20 of 148 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.