Octave Specialty Group, Inc. (OSG)
SURETY INSURANCE
Octave Specialty Group, Inc. (OSG) is listed on the New York Stock Exchange, where it has traded since August 25, 1989.
- Listed On
- the New York Stock Exchange
- Listed Since
- August 25, 1989
- Employees
- 275
- Market Cap
- $189M
About Octave Specialty Group, Inc.
Octave Specialty Group Inc is a world-wide specialty insurance firm that provides strategic direction, risk oversight, data and technology solutions, and capital support to MGA businesses operating across the U.S., U.K., and Bermuda. The company operates in two segments: Specialty Property and Casualty Insurance and ID.
Institutional ownership
In 13F filings for the quarter ended June 30, 2026, 144 institutions reported holding OSG, with 30.1 million shares worth $187.6 million in aggregate. The largest reported holder was BlackRock, with 4.6 million shares worth $28.5 million. Of the 5 largest holders listed below, 4 added shares and 1 held its position unchanged during the quarter.
| Institution | Shares | Value | Quarter change |
|---|---|---|---|
| BlackRock | 4,572,516 | $29M | Added 16.71% |
| Vanguard | 2,723,930 | $17M | Added 7.49% |
| Western Standard | 2,247,591 | $14M | Unchanged |
| Prescott Group Capital Management, | 1,647,793 | $10M | Added 3.47% |
| Third Avenue Management | 1,341,879 | $8M | Added 0.05% |
Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.
Frequently asked questions
What is OSG?
Octave Specialty Group, Inc. (OSG) is listed on the New York Stock Exchange, where it has traded since August 25, 1989.
Who are the largest institutional holders of OSG?
In 13F filings for the quarter ended June 30, 2026, the largest reported holders of OSG were BlackRock, Vanguard and Western Standard.
How many institutions own OSG?
144 institutions reported a position in OSG for the quarter ended June 30, 2026, worth $187.6 million in total.
Did institutions buy or sell OSG last quarter?
Of the 5 largest reported holders, 4 added shares and 1 held its position unchanged during the quarter. Every reported holder and its change is on the SentiSense ownership page for OSG.
Every reported institutional holder, plus insider and congressional trades in OSG, on SentiSense.