OSG Octave Specialty Group, Inc.
Octave Specialty Group, Inc. (OSG) Institutional Ownership
What the institutions did with OSG last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 4.6M | 15.2% |
| Western Standard LLC | 2.2M | 7.5% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | 6.6% |
| Prescott Group Capital Management, L.L.C. | 1.6M | 5.5% |
| THIRD AVENUE MANAGEMENT LLC | 1.3M | 4.5% |
| Bain Capital Credit, LP | 1.1M | 3.7% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1M | 3.7% |
| STATE STREET CORP | 898.7K | 3.0% |
| DIMENSIONAL FUND ADVISORS LP | 716.9K | 2.4% |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 649.5K | 2.2% |
| MARSHALL WACE, LLP | 601.8K | 2.0% |
| ZACKS INVESTMENT MANAGEMENT | 590.4K | 2.0% |
| Bracebridge Capital, LLC | 579.2K | 1.9% |
| MORGAN STANLEY | 569.6K | 1.9% |
| GOLDMAN SACHS GROUP INC | 560.8K | 1.9% |
| RIHO Partners, LLC | 554.8K | 1.8% |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 539.3K | 1.8% |
| GENDELL JEFFREY L | 494.1K | 1.6% |
| Wolf Hill Capital Management, LP | 480.2K | 1.6% |
| Nuveen, LLC | 428.2K | 1.4% |
| CITADEL ADVISORS LLC | 422.8K | 1.4% |
| Caption Management, LLC | 419.1K | 1.4% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 392.4K | 1.3% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 377.9K | 1.3% |
| NORTHERN TRUST CORP | 352.7K | 1.2% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Wolf Hill Capital Management, LP | Reduced | 1.5M | 480.2K | -990.1K |
| GENDELL JEFFREY L | Reduced | 1.4M | 494.1K | -919.1K |
| BlackRock, Inc. | Increased | 3.9M | 4.6M | +654.7K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 1.3M | 716.9K | -593.2K |
| ZACKS INVESTMENT MANAGEMENT | New | 0 | 590.4K | +590.4K |
| JANE STREET GROUP, LLC | Reduced | 764.4K | 278.7K | -485.7K |
| MARSHALL WACE, LLP | Reduced | 1.1M | 601.8K | -463.5K |
| Nuveen, LLC | Reduced | 800.3K | 428.2K | -372.1K |
| MORGAN STANLEY | Increased | 235.2K | 569.6K | +334.3K |
| AYAL Capital Advisors Ltd | New | 0 | 280.0K | +280.0K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | 390.2K | 136.7K | -253.5K |
| JPMORGAN CHASE & CO | Reduced | 268.4K | 18.7K | -249.8K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | 884.3K | 649.5K | -234.7K |
| Caption Management, LLC | Reduced | 642.6K | 419.1K | -223.5K |
| GOLDMAN SACHS GROUP INC | Increased | 346.3K | 560.8K | +214.5K |
| RAYMOND JAMES FINANCIAL INC | Increased | 25.7K | 239.7K | +214.0K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 49.8K | 229.9K | +180.1K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 144.3K | 302.9K | +158.6K |
| PRUDENTIAL FINANCIAL INC | Increased | 70.1K | 226.0K | +155.9K |
| GSA CAPITAL PARTNERS LLP | New | 0 | 143.6K | +143.6K |
| Quantinno Capital Management LP | Increased | 48.7K | 190.3K | +141.6K |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | Sold Out | 139.2K | 0 | -139.2K |
| BANK OF AMERICA CORP /DE/ | Reduced | 256.1K | 131.4K | -124.8K |
| ESSEX INVESTMENT MANAGEMENT CO LLC | Increased | 418.2K | 539.3K | +121.1K |
| Diametric Capital, LP | New | 0 | 118.4K | +118.4K |
| UBS Group AG | Reduced | 264.3K | 147.2K | -117.1K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 135.1K | 19.6K | -115.5K |
| Point72 Asset Management, L.P. | Sold Out | 113.7K | 0 | -113.7K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 227.7K | 117.2K | -110.5K |
| Cruiser Capital Advisors, LLC | Sold Out | 108.8K | 0 | -108.8K |
| LONE PEAK GLOBAL INVESTORS LLC | New | 0 | 107.7K | +107.7K |
| XTX Topco Ltd | Reduced | 116.9K | 18.7K | -98.3K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 295.9K | 392.4K | +96.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.0M | 1.1M | +83.9K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 295.3K | 377.9K | +82.5K |
| Squarepoint Ops LLC | Sold Out | 76.9K | 0 | -76.9K |
| Engineers Gate Manager LP | Reduced | 100.4K | 25.5K | -74.9K |
| Walleye Capital LLC | Sold Out | 67.1K | 0 | -67.1K |
| Man Group plc | New | 0 | 66.6K | +66.6K |
| WELLS FARGO & COMPANY/MN | Increased | 55.3K | 116.7K | +61.4K |
| Empowered Funds, LLC | Reduced | 114.0K | 54.0K | -60.0K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | 182.5K | 122.5K | -60.0K |
| Jump Financial, LLC | Reduced | 70.6K | 11.6K | -59.0K |
| FJ Capital Management LLC | New | 0 | 57.9K | +57.9K |
| AMERIPRISE FINANCIAL INC | Reduced | 115.0K | 58.5K | -56.5K |
| TUDOR INVESTMENT CORP ET AL | Increased | 160.0K | 216.4K | +56.4K |
| Prescott Group Capital Management, L.L.C. | Increased | 1.6M | 1.6M | +55.2K |
| HRT FINANCIAL LP | Sold Out | 51.0K | 0 | -51.0K |
| Legato Capital Management LLC | Increased | 130.8K | 181.0K | +50.3K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Increased | 148 | 47.9K | +47.7K |
| SEI INVESTMENTS CO | Reduced | 156.1K | 109.4K | -46.7K |
| Vanguard Global Advisers, LLC | Increased | 18.7K | 63.1K | +44.5K |
| ACADIAN ASSET MANAGEMENT LLC | Sold Out | 42.9K | 0 | -42.9K |
| STATE STREET CORP | Reduced | 941.4K | 898.7K | -42.7K |
| Quantbot Technologies LP | Sold Out | 38.7K | 0 | -38.7K |
| Mariner, LLC | New | 0 | 30.6K | +30.6K |
| NORTHERN TRUST CORP | Increased | 322.3K | 352.7K | +30.3K |
| AMERICAN CENTURY COMPANIES INC | Reduced | 120.5K | 91.0K | -29.5K |
| Commonwealth Financial Services, LLC | Sold Out | 29.0K | 0 | -29.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.9M | 2.0M | +27.5K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.