Octave Specialty GroupOSG
13F holders, Q3 2025 (September 30)130holders −16
22new positions
35sold out
6famous investors
$14.33avg. 13F price*
At the end of Q3 2025, 130 institutions reported holding Octave Specialty Group Inc. (OSG) in their 13F filings, down 16 from Q2 2025. 22 opened new positions and 35 sold out. The largest holders were Manufacturers Life Insurance Company, The ($232.0M), BlackRock, Inc. ($37.5M) and Western Standard LLC ($22.0M). 6 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Octave Specialty Group Inc.
- Filed as
- AMBAC FINL GROUP INC (Q3 2025)
- CUSIP
- 023139884
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 22 | $27.8M |
| Exits | 35 | $19.1M |
All 13F filers, Q2 2025 → Q3 2025: 9,337,266 shares bought and 7,757,240 shares sold, net +1,580,026 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 130 holders
| Manufacturers Life Insurance Company, The | 0.19% | Add +6604.6% | 1,206,350 | $232.0M |
| BlackRock, Inc. | 0.00% | Reduce -2.1% | 4,493,331 | $37.5M |
| Western Standard LLC | 11.78% | New | 2,641,351 | $22.0M |
| Vanguard Group Inc. | 0.00% | Reduce -0.5% | 2,555,181 | $21.3M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -10.6% | 2,141,047 | $17.9M |
| Continental General Insurance Co. | 3.35% | Add +69.8% | 2,068,349 | $17.3M |
| Gendell Jeffrey L | 0.29% | Add +55.6% | 1,864,512 | $15.6M |
| FMR LLC | 0.00% | Reduce -0.5% | 1,525,423 | $12.7M |
| Wolf Hill Capital Management, LP | 0.92% | Add +67.0% | 1,158,197 | $9.7M |
| Caption Management, LLC | 0.57% | Add +536.8% | 1,121,179 | $9.4M |
| Bain Capital Credit, LP | 2.91% | No change | 1,108,012 | $9.2M |
| Nuveen, LLC | 0.00% | Add +131.1% | 1,079,328 | $9.0M |
| Geode Capital Management, LLC | 0.00% | Reduce -5.5% | 1,060,594 | $8.8M |
| State Street Corp. | 0.00% | Add +0.9% | 967,188 | $8.1M |
| Prescott Group Capital Management, L.L.C. | 0.79% | Add +2.3% | 895,977 | $7.5M |
| Jane Street Group, LLC | 0.01% | Add +65.7% | 849,182 | $7.1M |
| Millennium Management | 0.00% | Reduce -29.6% | 700,895 | $5.8M |
| Barclays PLC | 0.00% | Add +47.2% | 669,513 | $5.6M |
| Third Avenue Management LLC | 0.92% | No change | 603,391 | $4.9M |
| Bracebridge Capital, LLC | 2.11% | No change | 579,234 | $4.8M |
| Schonfeld Strategic Advisors LLC | 0.03% | Add +92.0% | 548,442 | $4.6M |
| Deutsche Bank AG | 0.00% | Reduce -17.5% | 532,138 | $4.4M |
| Goldman Sachs Group Inc. | 0.00% | Add +9.5% | 524,890 | $4.4M |
| Marshall Wace, LLP | 0.00% | Reduce -29.8% | 455,074 | $3.8M |
| Franklin Resources Inc. | 0.00% | Add +60.0% | 17,080 | $3.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -1.4% | 382,572 | $3.2M |
| Northern Trust Corp. | 0.00% | Reduce -6.9% | 362,021 | $3.0M |
| Bridgeway Capital Management, LLC | 0.06% | Add +0.7% | 319,493 | $2.7M |
| UBS Group AG | 0.00% | Reduce -22.4% | 279,489 | $2.3M |
| Susquehanna International Group, LLP | 0.00% | Reduce -70.8% | 274,310 | $2.3M |
| Empowered Funds, LLC | 0.02% | Add +13.2% | 234,493 | $2.0M |
| Bank of America Corp. | 0.00% | Add +22.2% | 203,202 | $1.7M |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | 2.52% | New | 203,011 | $1.7M |
| Harbor Advisors LLC | 0.25% | No change | 196,382 | $1.6M |
| Morgan Stanley | 0.00% | Reduce -57.6% | 194,124 | $1.6M |
| VELA Investment Management, LLC | 0.43% | Add +46.7% | 180,089 | $1.5M |
| Squarepoint Ops LLC | 0.00% | Reduce -62.5% | 175,017 | $1.5M |
| Citadel Advisors | 0.00% | Reduce -84.7% | 171,543 | $1.4M |
| Invesco Ltd. | 0.00% | Reduce -3.7% | 164,081 | $1.4M |
| Y-Intercept (Hong Kong) Ltd | 0.03% | Reduce -57.1% | 150,489 | $1.3M |
| Bank of New York Mellon Corp | 0.00% | Reduce -2.3% | 138,687 | $1.2M |
| Trexquant Investment LP | 0.01% | Reduce -56.9% | 136,696 | $1.1M |
| American Century Companies Inc. | 0.00% | Reduce -69.7% | 132,648 | $1.1M |
| Tudor Investment Corporation | 0.01% | Reduce -59.1% | 125,155 | $1.0M |
| D. E. Shaw & Co. | 0.00% | Reduce -64.6% | 118,725 | $990K |
| Cruiser Capital Advisors, LLC | 0.93% | New | 111,800 | $932K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Reduce -5.0% | 105,465 | $880K |
| HSBC Holdings PLC | 0.00% | Add +6.5% | 103,668 | $828K |
| IMC-Chicago, LLC | 0.01% | Reduce -30.9% | 97,422 | $812K |
| Creative Planning | 0.00% | Add +342.2% | 90,303 | $753K |
| Renaissance Technologies | 0.00% | Reduce -52.1% | 89,200 | $744K |
| BNP Paribas Financial Markets | 0.00% | Reduce -25.4% | 89,147 | $743K |
| AQR Capital Management | 0.00% | Add +60.9% | 82,562 | $689K |
| Balyasny Asset Management L.P. | 0.00% | New | 81,221 | $677K |
| DLD Asset Management, LP | 0.28% | Add +58.6% | 79,300 | $661K |
| SG Americas Securities, LLC | 0.00% | Add +248.5% | 75,415 | $629K |
| Wells Fargo & Company | 0.00% | Add +2.9% | 73,857 | $616K |
| Empirical Finance, LLC | 0.03% | No change | 72,182 | $602K |
| T. Rowe Price Associates Inc. | 0.00% | Add +35.9% | 70,941 | $592K |
| Sender Co & Partners, Inc. | 0.23% | New | 70,890 | $591K |
| Rhumbline Advisers | 0.00% | Reduce -10.3% | 67,170 | $560K |
| Caxton Associates LLP | 0.01% | No change | 65,647 | $547K |
| Diametric Capital, LP | 0.20% | New | 64,626 | $539K |
| Prudential Financial Inc. | 0.00% | New | 56,625 | $472K |
| Quantinno Capital Management LP | 0.00% | Add +40.0% | 40,353 | $337K |
| Alliancebernstein L.P. | 0.00% | No change | 37,530 | $313K |
| Brevan Howard Capital Management LP | 0.00% | Reduce -30.0% | 35,485 | $296K |
| JPMorgan Chase & Co. | 0.00% | Add +10.6% | 34,555 | $288K |
| Quarry LP | 0.06% | Add +1572.0% | 26,000 | $217K |
| Wolverine Trading, LLC | 0.00% | New | 21,298 | $207K |
| KLCM Advisors, Inc. | 0.02% | No change | 24,000 | $200K |
| Intech Investment Management LLC | 0.00% | Reduce -45.6% | 22,520 | $188K |
| Cresset Asset Management, LLC | 0.00% | No change | 22,193 | $185K |
| Gator Capital Management, LLC | 0.05% | No change | 21,435 | $179K |
| Simplex Trading, LLC | 0.00% | Reduce -33.1% | 20,878 | $174K |
| Verition Fund Management LLC | 0.00% | Reduce -47.8% | 20,533 | $171K |
| Group One Trading LLC | 0.01% | Reduce -93.6% | 20,449 | $171K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -23.7% | 20,052 | $167K |
| MetLife Investment Management, LLC | 0.00% | New | 18,353 | $153K |
| Mraz, Amerine & Associates, Inc. | 0.02% | Reduce -3.2% | 18,250 | $152K |
| Prelude Capital Management, LLC | 0.01% | New | 17,878 | $149K |
| ExodusPoint Capital Management, LP | 0.00% | Reduce -69.3% | 14,159 | $118K |
| Ieq Capital, LLC | 0.00% | Add +0.3% | 13,702 | $114K |
| State Board of Administration of Florida Retirement System | 0.00% | No change | 12,630 | $105K |
| Aquatic Capital Management LLC | 0.00% | New | 12,588 | $105K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +28.5% | 11,825 | $99K |
| Cerity Partners LLC | 0.00% | Reduce -3.0% | 11,490 | $96K |
| FNY Investment Advisers, LLC | 0.03% | New | 11,207 | $93K |
| New York State Common Retirement Fund | 0.00% | No change | 10,073 | $84K |
| Citigroup Inc. | 0.00% | Reduce -59.4% | 9,341 | $78K |
| Cwm, LLC | 0.00% | Add +75.7% | 6,961 | $58K |
| Arax Advisory Partners | 0.00% | New | 6,614 | $55K |
| Russell Investments Group, Ltd. | 0.00% | Add +613.5% | 4,916 | $41K |
| Federated Hermes, Inc. | 0.00% | Reduce -15.5% | 4,420 | $37K |
| Legal & General Group Plc | 0.00% | Reduce -10.8% | 3,839 | $32K |
| Ameritas Investment Partners, Inc. | 0.00% | Reduce -20.4% | 3,648 | $30K |
| Sterling Capital Management LLC | 0.00% | Add +144.1% | 2,978 | $25K |
| California State Teachers Retirement System | 0.00% | New | 2,974 | $25K |
| State of Wyoming | 0.00% | Reduce -82.2% | 2,589 | $22K |
| Quadrant Capital Group LLC | 0.00% | New | 2,483 | $21K |
"% of holder's portfolio" is OSG's weight in each manager's 13F, not the share of Octave Specialty Group Inc. the manager owns.