Octave Specialty Group Inc
OSG- Exchange
- NYSE
- Industry
- Surety Insurance
- SEC CIK
- 0000874501
No open-market purchases or sales by Octave Specialty Group Inc insiders were filed in the last 90 days; 147 institutions reported holding it in 13F filings for Q2 2026, worth $187.6M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Octave Specialty Group Inc as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 148
- +6 vs. Q4 2025
- Shares held
- 32.5M
- +418.0K (+1.3%) vs. Q4 2025
- Total value
- $151.4M
- −$98.5M (−39.4%) vs. Q4 2025
- New holders
- 39
- 32 more added
- Sold out
- 33
- 55 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting OSG on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 147 | $187.6M |
| Q1 2026 | 148 | $151.4M |
| Q4 2025 | 144 | $270.0M |
| Q3 2025 | 130 | $303.6M |
| Q2 2025 | 147 | $262.5M |
| Q1 2025 | 176 | $327.5M |
| Q4 2024 | 181 | $522.4M |
| Q3 2024 | 180 | $449.6M |
| Q2 2024 | 182 | $495.9M |
| Q1 2024 | 172 | $591.5M |
| Q4 2023 | 174 | $628.4M |
| Q3 2023 | 167 | $438.7M |
| Q2 2023 | 160 | $529.6M |
| Q1 2023 | 160 | $596.2M |
| Q4 2022 | 167 | $600.4M |
| Q3 2022 | 154 | $400.7M |
| Q2 2022 | 141 | $386.6M |
| Q1 2022 | 150 | $392.1M |
| Q4 2021 | 135 | $598.9M |
| Q3 2021 | 133 | $516.2M |
| Q2 2021 | 126 | $565.0M |
| Q1 2021 | 140 | $611.7M |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Octave Specialty Group Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Empowered Funds, LLC | 114,004 | $530.1K | 0.00% | +114,004 | New |
| Ameriprise Financial Inc | 115,045 | $535.0K | 0.00% | +115,045 | New |
| XTX Topco Ltd | 116,911 | $543.6K | 0.01% | +85,853+276.4% | Added |
| American Century Companies Inc | 120,540 | $560.5K | 0.00% | −3,059−2.5% | Reduced |
| Bank of New York Mellon Corp | 130,471 | $606.7K | 0.00% | −7,702−5.6% | Reduced |
| Legato Capital Management LLC | 130,760 | $608.0K | 0.06% | −1,860−1.4% | Reduced |
| Millennium Management LLC | 135,088 | $628.2K | 0.00% | −168,194−55.5% | Reduced |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | 139,168 | $647.1K | 0.94% | −63,843−31.4% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 144,301 | $671.0K | 0.00% | +75,528+109.8% | Added |
| Invesco Ltd. | 151,042 | $702.3K | 0.00% | −5,462−3.5% | Reduced |
| SEI Investments Co | 156,078 | $725.8K | 0.00% | +89,360+133.9% | Added |
| Tudor Investment Corp Et Al | 159,963 | $743.8K | 0.00% | +159,963 | New |
| Russell Investments Group, Ltd. | 181,271 | $842.9K | 0.00% | −164,987−47.6% | Reduced |
| Bridgeway Capital Management, LLC | 182,504 | $848.6K | 0.02% | −62,883−25.6% | Reduced |
| Harbor Advisors LLC | 196,382 | $913.2K | 0.13% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 227,726 | $1.06M | 0.00% | +202,568+805.2% | Added |
| Morgan Stanley | 235,246 | $1.09M | 0.00% | −703,466−74.9% | Reduced |
| Bank of America Corp | 256,110 | $1.19M | 0.00% | −74,791−22.6% | Reduced |
| UBS Group AG | 264,280 | $1.23M | 0.00% | +110,416+71.8% | Added |
| JPMorgan Chase & Co | 268,434 | $1.24M | 0.00% | +115,739+75.8% | Added |
| Vanguard Fiduciary Trust Co | 274,562 | $1.28M | 0.00% | +274,562 | New |
| Charles Schwab Investment Management Inc | 295,344 | $1.37M | 0.00% | −66,080−18.3% | Reduced |
| Vanguard Portfolio Management LLC | 295,900 | $1.38M | 0.00% | +295,900 | New |
| Northern Trust Corp | 322,348 | $1.50M | 0.00% | −798−0.2% | Reduced |
| Skopos Labs, Inc. | 325,351 | $1.51M | 0.05% | +325,351 | New |
| IPG Investment Advisors LLC | 325,616 | $1.51M | 0.26% | +325,616 | New |
| Goldman Sachs Group Inc | 346,293 | $1.61M | 0.00% | −433,682−55.6% | Reduced |
| Susquehanna International Group, LLP | 390,193 | $1.81M | 0.00% | −136,395−25.9% | Reduced |
| Essex Investment Management Co LLC | 418,203 | $1.94M | 0.31% | +7,381+1.8% | Added |
| Citadel Advisors LLC | 431,809 | $2.01M | 0.00% | +144,526+50.3% | Added |
| RIHO Partners, LLC | 546,569 | $2.54M | 1.60% | +546,569 | New |
| Bracebridge Capital, LLC | 579,234 | $2.69M | 0.48% | 00.0% | Unchanged |
| Caption Management, LLC | 642,597 | $2.99M | 0.14% | −428,497−40.0% | Reduced |
| Jane Street Group, LLC | 764,384 | $3.55M | 0.00% | −756,270−49.7% | Reduced |
| Nuveen, LLC | 800,253 | $3.72M | 0.00% | −10,026−1.2% | Reduced |
| Jacobs Levy Equity Management, Inc | 884,272 | $4.11M | 0.02% | +647,087+272.8% | Added |
| State Street Corp | 941,404 | $4.38M | 0.00% | −1,964−0.2% | Reduced |
| Geode Capital Management, LLC | 1,022,438 | $4.76M | 0.00% | −2,109−0.2% | Reduced |
| Marshall Wace, LLP | 1,065,335 | $4.95M | 0.01% | +316,763+42.3% | Added |
| Bain Capital Credit, LP | 1,108,012 | $5.15M | 1.70% | 00.0% | Unchanged |
| Dimensional Fund Advisors LP | 1,310,132 | $6.09M | 0.00% | −375,495−22.3% | Reduced |
| Third Avenue Management LLC | 1,341,211 | $6.24M | 1.01% | +559,118+71.5% | Added |
| Gendell Jeffrey L | 1,413,212 | $6.57M | 0.09% | −156,260−10.0% | Reduced |
| Wolf Hill Capital Management, LP | 1,470,334 | $6.84M | 0.97% | −418,639−22.2% | Reduced |
| Prescott Group Capital Management, L.L.C. | 1,592,587 | $7.41M | 0.74% | +699,070+78.2% | Added |
| Vanguard Capital Management LLC | 1,945,076 | $9.04M | 0.00% | +1,945,076 | New |
| Western Standard LLC | 2,247,591 | $10.5M | 5.50% | −257,036−10.3% | Reduced |
| BlackRock, Inc. | 3,917,798 | $18.2M | 0.00% | −570,670−12.7% | Reduced |
| VELA Investment Management, LLC | 0 | $0 | 0.00% | −178,752−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −169,824−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −109,765−100.0% | Sold out |
| Creative Planning | 0 | $0 | 0.00% | −68,537−100.0% | Sold out |
| Diametric Capital, LP | 0 | $0 | 0.00% | −66,478−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −65,647−100.0% | Sold out |
| DLD Asset Management, LP | 0 | $0 | 0.00% | −60,421−100.0% | Sold out |
| Calamos Advisors LLC | 0 | $0 | 0.00% | −49,089−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −45,044−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −43,781−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −42,917−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −42,354−100.0% | Sold out |
| PEAK6 LLC | 0 | $0 | 0.00% | −30,478−100.0% | Sold out |
| Oxford Asset Management LLP | 0 | $0 | 0.00% | −25,413−100.0% | Sold out |
| Aquatic Capital Management LLC | 0 | $0 | 0.00% | −23,067−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −21,219−100.0% | Sold out |
| Intech Investment Management LLC | 0 | $0 | 0.00% | −21,038−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −19,235−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −15,103−100.0% | Sold out |
| nVerses Capital, LLC | 0 | $0 | 0.00% | −12,181−100.0% | Sold out |
| Cerity Partners LLC | 0 | $0 | 0.00% | −11,332−100.0% | Sold out |
| Voleon Capital Management LP | 0 | $0 | 0.00% | −11,204−100.0% | Sold out |
| Inscription Capital, LLC | 0 | $0 | 0.00% | −10,800−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −10,643−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −10,158−100.0% | Sold out |
| Kemnay Advisory Services Inc. | 0 | $0 | 0.00% | −8,059−100.0% | Sold out |
| Versant Capital Management, Inc | 0 | $0 | 0.00% | −1,823−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −1,297−100.0% | Sold out |
| Torren Management, LLC | 0 | $0 | 0.00% | −1,024−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −257−100.0% | Sold out |
| Signaturefd, LLC | 0 | $0 | 0.00% | −180−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −81−100.0% | Sold out |
| True Wealth Design, LLC | 0 | $0 | 0.00% | −45−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Norges Bank | – | – | – | – | Not filed |