Who owns OCTAVE SPECIALTY GROUP INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of OSG from SEC Form 13F filings across 147 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 147 institutions disclosed 30.1M shares of OCTAVE SPECIALTY GROUP INC worth $187.6M — about 66.2% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
147
13F holders
$187.6M
value, 2026 filers
66.2%
of shares outstanding (30.1M sh)
37
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of OSG's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.6M | $28.5M | 0.0% | 10.1% | +16.7% |
| 2 | Western Standard LLC | 2.2M | $14.0M | 4.8% | 5% | 0.0% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | $12.3M | 0.0% | 4.3% | +1.4% |
| 4 | Prescott Group Capital Management, L.L.C. | 1.6M | $10.3M | 0.9% | 3.6% | +3.5% |
| 5 | THIRD AVENUE MANAGEMENT LLC | 1.3M | $8.4M | 1.3% | 3% | 0.0% |
| 6 | Bain Capital Credit, LP | 1.1M | $6.9M | 1.9% | 2.4% | 0.0% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $6.9M | 0.0% | 2.4% | +8.2% |
| 8 | STATE STREET CORP | 898,673 | $5.6M | 0.0% | 2% | -4.5% |
| 9 | DIMENSIONAL FUND ADVISORS LP | 716,947 | $4.5M | 0.0% | 1.6% | -45.3% |
| 10 | JACOBS LEVY EQUITY MANAGEMENT, INC | 649,530 | $4.1M | 0.0% | 1.4% | -26.5% |
| 11 | MARSHALL WACE, LLP | 601,796 | $3.8M | 0.0% | 1.3% | -43.5% |
| 12 | ZACKS INVESTMENT MANAGEMENTNEW | 590,370 | $3.7M | 0.0% | 1.3% | new |
| 13 | Bracebridge Capital, LLC | 579,234 | $3.6M | 0.1% | 1.3% | 0.0% |
| 14 | MORGAN STANLEY | 569,563 | $3.6M | 0.0% | 1.3% | +142.1% |
| 15 | GOLDMAN SACHS GROUP INC | 560,756 | $3.5M | 0.0% | 1.2% | +61.9% |
| 16 | RIHO Partners, LLC | 554,818 | $3.5M | 1.9% | 1.2% | +1.5% |
| 17 | ESSEX INVESTMENT MANAGEMENT CO LLC | 539,289 | $3.4M | 0.4% | 1.2% | +29.0% |
| 18 | GENDELL JEFFREY L | 494,092 | $3.1M | 0.0% | 1.1% | -65.0% |
| 19 | Wolf Hill Capital Management, LP | 480,187 | $3.0M | 0.3% | 1.1% | -67.3% |
| 20 | Nuveen, LLC | 428,165 | $2.7M | 0.0% | 0.9% | -46.5% |
| 21 | CITADEL ADVISORS LLC | 422,777 | $2.6M | 0.0% | 0.9% | -2.1% |
| 22 | Caption Management, LLC | 419,136 | $2.6M | 0.0% | 0.9% | -34.8% |
| 23 | VANGUARD PORTFOLIO MANAGEMENT LLC | 392,350 | $2.4M | 0.0% | 0.9% | +32.6% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 377,869 | $2.4M | 0.0% | 0.8% | +27.9% |
| 25 | NORTHERN TRUST CORP | 352,680 | $2.2M | 0.0% | 0.8% | +9.4% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.