Octave Specialty GroupOSG
13F holders, Q2 2025 (June 30)146holders −29
29new positions
59sold out
6famous investors
$7.10avg. 13F price*
At the end of Q2 2025, 146 institutions reported holding Octave Specialty Group Inc. (OSG) in their 13F filings, down 29 from Q1 2025. 29 opened new positions and 59 sold out. The largest holders were BlackRock, Inc. ($32.6M), Vanguard Group Inc. ($18.2M) and Dimensional Fund Advisors LP ($17.0M). 6 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Octave Specialty Group Inc.
- Filed as
- AMBAC FINL GROUP INC (Q2 2025)
- CUSIP
- 023139884
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 29 | $15.4M |
| Exits | 59 | $19.8M |
All 13F filers, Q1 2025 → Q2 2025: 6,356,974 shares bought and 6,937,622 shares sold, net −580,648 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 146 holders
| BlackRock, Inc. | 0.00% | Reduce -6.3% | 4,588,054 | $32.6M |
| Vanguard Group Inc. | 0.00% | Reduce -3.5% | 2,568,440 | $18.2M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -6.3% | 2,395,737 | $17.0M |
| FMR LLC | 0.00% | Reduce -0.2% | 1,532,645 | $10.9M |
| Continental General Insurance Co. | 2.22% | New | 1,218,349 | $8.7M |
| Gendell Jeffrey L | 0.23% | Add +99.0% | 1,198,420 | $8.5M |
| Geode Capital Management, LLC | 0.00% | Add +2.5% | 1,122,616 | $8.0M |
| Citadel Advisors | 0.01% | Add +1.4% | 1,118,761 | $7.9M |
| Bain Capital Credit, LP | 2.86% | No change | 1,108,012 | $7.9M |
| Millennium Management | 0.01% | Add +95.8% | 996,041 | $7.1M |
| State Street Corp. | 0.00% | Reduce -7.1% | 958,855 | $6.8M |
| Susquehanna International Group, LLP | 0.01% | Reduce -20.3% | 940,583 | $6.7M |
| Prescott Group Capital Management, L.L.C. | 0.73% | Add +98.0% | 875,977 | $6.2M |
| Hotchkis & Wiley Capital Management LLC | 0.02% | Add +42.3% | 793,500 | $5.6M |
| Repertoire Partners LP | 86.09% | Reduce -38.6% | 721,188 | $5.1M |
| Wolf Hill Capital Management, LP | 0.41% | No change | 693,444 | $4.9M |
| Marshall Wace, LLP | 0.01% | Add +215.6% | 648,155 | $4.6M |
| Deutsche Bank AG | 0.00% | Reduce -10.8% | 645,360 | $4.6M |
| Third Avenue Management LLC | 0.88% | Add +64.7% | 603,391 | $4.3M |
| Bracebridge Capital, LLC | 2.27% | No change | 579,234 | $4.1M |
| Jane Street Group, LLC | 0.01% | Reduce -29.2% | 512,443 | $3.6M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -29.5% | 479,383 | $3.4M |
| Nuveen, LLC | 0.00% | Add +65.2% | 466,978 | $3.3M |
| Squarepoint Ops LLC | 0.01% | Add +100.7% | 466,369 | $3.3M |
| Morgan Stanley | 0.00% | Reduce -46.7% | 457,631 | $3.2M |
| Barclays PLC | 0.00% | Reduce -7.1% | 454,827 | $3.2M |
| American Century Companies Inc. | 0.00% | Reduce -48.8% | 438,335 | $3.1M |
| Northern Trust Corp. | 0.00% | Reduce -15.7% | 388,921 | $2.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.4% | 387,959 | $2.8M |
| UBS Group AG | 0.00% | Add +153.8% | 360,265 | $2.6M |
| Y-Intercept (Hong Kong) Ltd | 0.06% | Add +139.5% | 350,701 | $2.5M |
| D. E. Shaw & Co. | 0.00% | Reduce -18.4% | 335,647 | $2.4M |
| Group One Trading LLC | 0.07% | Reduce -5.8% | 321,724 | $2.3M |
| Bridgeway Capital Management, LLC | 0.05% | Add +4.0% | 317,249 | $2.3M |
| Trexquant Investment LP | 0.03% | Add +96.8% | 316,960 | $2.3M |
| Tudor Investment Corporation | 0.02% | Add +10.4% | 305,702 | $2.2M |
| Immersion Corp. | 1.08% | New | 300,000 | $2.1M |
| Cubist Systematic Strategies, LLC | 0.02% | Add +75.8% | 299,948 | $2.1M |
| Schonfeld Strategic Advisors LLC | 0.02% | Reduce -45.3% | 285,581 | $2.0M |
| Empowered Funds, LLC | 0.02% | Add +6.2% | 207,249 | $1.5M |
| Harbor Advisors LLC | 0.23% | No change | 196,382 | $1.4M |
| Renaissance Technologies | 0.00% | Add +8.5% | 186,100 | $1.3M |
| Caption Management, LLC | 0.12% | Reduce -51.5% | 176,074 | $1.3M |
| Invesco Ltd. | 0.00% | Reduce -5.6% | 170,436 | $1.2M |
| Bank of America Corp. | 0.00% | Reduce -9.5% | 166,265 | $1.2M |
| Ameriprise Financial Inc. | 0.00% | Add +65.5% | 164,805 | $1.2M |
| Walleye Trading LLC | 0.03% | Reduce -48.2% | 154,159 | $1.1M |
| Bank of New York Mellon Corp | 0.00% | Reduce -1.5% | 141,935 | $1.0M |
| IMC-Chicago, LLC | 0.03% | Add +48.8% | 141,026 | $1.0M |
| VELA Investment Management, LLC | 0.26% | Add +32.9% | 122,770 | $872K |
| BNP Paribas Financial Markets | 0.00% | Add +467.1% | 119,468 | $848K |
| HRT Financial LP | 0.00% | Reduce -70.3% | 119,016 | $845K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Add +255.9% | 111,053 | $788K |
| Nebula Research & Development LLC | 0.06% | Add +46.5% | 107,124 | $761K |
| HSBC Holdings PLC | 0.00% | Reduce -54.8% | 97,348 | $675K |
| Norges Bank | 0.00% | Reduce -71.5% | 75,000 | $533K |
| Rhumbline Advisers | 0.00% | Add +7.7% | 74,916 | $532K |
| Empirical Finance, LLC | 0.03% | New | 72,182 | $512K |
| Public Sector Pension Investment Board | 0.00% | No change | 72,000 | $511K |
| Wells Fargo & Company | 0.00% | Add +0.7% | 71,808 | $510K |
| Caxton Associates LLP | 0.01% | No change | 65,647 | $466K |
| Virtu Financial LLC | 0.02% | New | 62,840 | $446K |
| Aurelius Capital Management, LP | 2.92% | New | 60,546 | $430K |
| State of Wisconsin Investment Board | 0.00% | New | 59,544 | $423K |
| Royal Bank of Canada | 0.00% | Add +1633.4% | 52,209 | $371K |
| T. Rowe Price Associates Inc. | 0.00% | Add +6.8% | 52,205 | $371K |
| AQR Capital Management | 0.00% | New | 51,300 | $364K |
| Brevan Howard Capital Management LP | 0.00% | Reduce -31.8% | 50,703 | $360K |
| DLD Asset Management, LP | 0.17% | New | 50,000 | $355K |
| Centiva Capital, LP | 0.02% | New | 46,815 | $332K |
| Engineers Gate Manager LP | 0.00% | Reduce -64.0% | 46,607 | $331K |
| ExodusPoint Capital Management, LP | 0.00% | Reduce -50.5% | 46,074 | $327K |
| Two Sigma Investments, LP | 0.00% | Reduce -65.0% | 43,923 | $312K |
| First Citizens Bank & Trust Co. | 0.01% | Add +207.1% | 43,210 | $307K |
| Envestnet Portfolio Solutions, Inc. | 0.00% | Add +232.6% | 41,667 | $296K |
| Intech Investment Management LLC | 0.00% | Add +11.4% | 41,388 | $294K |
| Verition Fund Management LLC | 0.00% | Reduce -0.2% | 39,318 | $279K |
| XTX Topco Ltd | 0.01% | Reduce -67.8% | 38,524 | $274K |
| Walleye Capital LLC | 0.00% | New | 38,094 | $270K |
| Fox Run Management, L.L.C. | 0.04% | Reduce -16.1% | 37,922 | $269K |
| Qube Research & Technologies Ltd | 0.00% | New | 37,584 | $267K |
| Alliancebernstein L.P. | 0.00% | Add +34.8% | 37,530 | $266K |
| Axq Capital, LP | 0.08% | Add +27.7% | 35,439 | $252K |
| Point72 Asia (Singapore) Pte. Ltd. | 0.04% | Reduce -26.5% | 33,143 | $235K |
| Graham Capital Management, L.P. | 0.01% | New | 31,418 | $223K |
| JPMorgan Chase & Co. | 0.00% | Reduce -50.8% | 31,231 | $222K |
| Simplex Trading, LLC | 0.01% | Reduce -76.1% | 31,219 | $221K |
| Quantinno Capital Management LP | 0.00% | New | 28,826 | $205K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -2.6% | 26,281 | $187K |
| FJ Capital Management LLC | 0.02% | New | 24,677 | $175K |
| KLCM Advisors, Inc. | 0.02% | No change | 24,000 | $170K |
| Sei Investments Co. | 0.00% | Add +24.8% | 23,565 | $167K |
| Citigroup Inc. | 0.00% | Reduce -52.4% | 23,031 | $164K |
| Cresset Asset Management, LLC | 0.00% | No change | 22,193 | $158K |
| SG Americas Securities, LLC | 0.00% | Reduce -40.2% | 21,642 | $154K |
| Gator Capital Management, LLC | 0.05% | No change | 21,435 | $152K |
| Creative Planning | 0.00% | New | 20,421 | $145K |
| Mraz, Amerine & Associates, Inc. | 0.02% | Reduce -3.6% | 18,850 | $134K |
| Quantbot Technologies LP | 0.00% | Reduce -81.2% | 18,834 | $134K |
| Manufacturers Life Insurance Company, The | 0.00% | Add +9.9% | 17,993 | $128K |
"% of holder's portfolio" is OSG's weight in each manager's 13F, not the share of Octave Specialty Group Inc. the manager owns.