Octave Specialty Group Inc

OSG

Exchange: NYSE
Industry: Surety Insurance
SEC CIK: 0000874501

SEC filings (opens in a new tab)

No open-market purchases or sales by Octave Specialty Group Inc insiders were filed in the last 90 days; 147 institutions reported holding it in 13F filings for Q2 2026, worth $187.6M in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Octave Specialty Group Inc changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of OSG: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	130	2	144	+16
Shares	37.6M	23.2K	34.7M	−2.92M (−7.8%)
Value	$303.6M	$222.5K	$270.0M	−$33.4M (−11.0%)

2 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (31)

Institutions that held Octave Specialty Group Inc at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to OSG in Q4 2025
Institution	Shares	Value	% of portfolio
Essex Investment Management Co LLC	410,822	$3.20M	0.49%
Jacobs Levy Equity Management, Inc	237,185	$1.85M	0.01%
Legato Capital Management LLC	132,620	$1.03M	0.09%
HRT Financial LP	111,702	$869.0K	0.00%
Point72 Asset Management, L.P.	103,544	$805.6K	0.00%
Walleye Capital LLC	88,284	$686.9K	0.00%
Jump Financial, LLC	85,213	$663.0K	0.01%
Engineers Gate Manager LP	81,585	$634.7K	0.01%
Norges Bank	75,000	$583.5K	0.00%
SEI Investments Co	66,718	$519.1K	0.00%
Calamos Advisors LLC	49,089	$381.9K	0.00%
Two Sigma Investments, LP	45,044	$350.4K	0.00%
Fox Run Management, L.L.C.	42,354	$329.5K	0.05%
Axq Capital, LP	40,374	$314.1K	0.07%
XTX Topco Ltd	31,058	$241.6K	0.01%
PEAK6 LLC	30,478	$237.1K	0.01%
Oxford Asset Management LLP	25,413	$197.7K	0.07%
Metis Global Partners, LLC	25,136	$195.6K	0.00%
CIBC Asset Management Inc	23,893	$185.9K	0.00%
Acadian Asset Management LLC	23,053	$179.0K	0.00%
Quadrature Capital Ltd	21,219	$165.1K	0.00%
Virtu Financial LLC	19,235	$150.0K	0.01%
Quantbot Technologies LP	19,241	$149.7K	0.00%
nVerses Capital, LLC	12,181	$94.8K	0.21%
Voleon Capital Management LP	11,204	$87.2K	0.00%
Crown Wealth Group, LLC	11,162	$86.8K	0.02%
Inscription Capital, LLC	10,800	$84.0K	0.01%
Quest Partners LLC	10,158	$79.0K	0.00%
Kemnay Advisory Services Inc.	8,059	$62.7K	0.01%
Torren Management, LLC	1,024	$7.97K	0.00%
Los Angeles Capital Management LLC	148	$1.26K	0.00%

Sold out (15)

Institutions that held Octave Specialty Group Inc at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of OSG in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Continental General Insurance Co	2,068,349	$17.3M
Empowered Funds, LLC	234,493	$1.96M
Squarepoint Ops LLC	175,017	$1.46M
Trexquant Investment LP	136,696	$1.14M
Tudor Investment Corp Et Al	125,155	$1.04M
Empirical Finance, LLC	72,182	$602.0K
Sender Co & Partners, Inc.	70,890	$591.2K
Cresset Asset Management, LLC	22,193	$185.1K
Gator Capital Management, LLC	21,435	$178.8K
Group One Trading, L.P.	20,449	$170.5K
Ieq Capital, LLC	13,702	$114.3K
FNY Investment Advisers, LLC	11,207	$93.0K
National Bank of Canada	385	$3.21K
Principal Securities, Inc.	120	$1.00K
Essential Partners LLC	14	$117

Not filed for Q4 2025 yet (2)

Institutions that held Octave Specialty Group Inc at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding OSG in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Wolverine Trading, LLC	21,298	$207.0K
Cove Street Capital, LLC	1,861	$15.5K