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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,917,798 | $18.2M | 0.00% | −570,670−12.7% | Reduced |
| Western Standard LLC | 2,247,591 | $10.5M | 5.50% | −257,036−10.3% | Reduced |
| Vanguard Capital Management LLC | 1,945,076 | $9.04M | 0.00% | +1,945,076 | New |
| Prescott Group Capital Management, L.L.C. | 1,592,587 | $7.41M | 0.74% | +699,070+78.2% | Added |
| Wolf Hill Capital Management, LP | 1,470,334 | $6.84M | 0.97% | −418,639−22.2% | Reduced |
| Gendell Jeffrey L | 1,413,212 | $6.57M | 0.09% | −156,260−10.0% | Reduced |
| Third Avenue Management LLC | 1,341,211 | $6.24M | 1.01% | +559,118+71.5% | Added |
| Dimensional Fund Advisors LP | 1,310,132 | $6.09M | 0.00% | −375,495−22.3% | Reduced |
| Bain Capital Credit, LP | 1,108,012 | $5.15M | 1.70% | 00.0% | Unchanged |
| Marshall Wace, LLP | 1,065,335 | $4.95M | 0.01% | +316,763+42.3% | Added |
| Geode Capital Management, LLC | 1,022,438 | $4.76M | 0.00% | −2,109−0.2% | Reduced |
| State Street Corp | 941,404 | $4.38M | 0.00% | −1,964−0.2% | Reduced |
| Jacobs Levy Equity Management, Inc | 884,272 | $4.11M | 0.02% | +647,087+272.8% | Added |
| Nuveen, LLC | 800,253 | $3.72M | 0.00% | −10,026−1.2% | Reduced |
| Jane Street Group, LLC | 764,384 | $3.55M | 0.00% | −756,270−49.7% | Reduced |
| Caption Management, LLC | 642,597 | $2.99M | 0.14% | −428,497−40.0% | Reduced |
| Bracebridge Capital, LLC | 579,234 | $2.69M | 0.48% | 00.0% | Unchanged |
| RIHO Partners, LLC | 546,569 | $2.54M | 1.60% | +546,569 | New |
| Citadel Advisors LLC | 431,809 | $2.01M | 0.00% | +144,526+50.3% | Added |
| Essex Investment Management Co LLC | 418,203 | $1.94M | 0.31% | +7,381+1.8% | Added |
| Susquehanna International Group, LLP | 390,193 | $1.81M | 0.00% | −136,395−25.9% | Reduced |
| Goldman Sachs Group Inc | 346,293 | $1.61M | 0.00% | −433,682−55.6% | Reduced |
| IPG Investment Advisors LLC | 325,616 | $1.51M | 0.26% | +325,616 | New |
| Skopos Labs, Inc. | 325,351 | $1.51M | 0.05% | +325,351 | New |
| Northern Trust Corp | 322,348 | $1.50M | 0.00% | −798−0.2% | Reduced |
| Vanguard Portfolio Management LLC | 295,900 | $1.38M | 0.00% | +295,900 | New |
| Charles Schwab Investment Management Inc | 295,344 | $1.37M | 0.00% | −66,080−18.3% | Reduced |
| Vanguard Fiduciary Trust Co | 274,562 | $1.28M | 0.00% | +274,562 | New |
| JPMorgan Chase & Co | 268,434 | $1.24M | 0.00% | +115,739+75.8% | Added |
| UBS Group AG | 264,280 | $1.23M | 0.00% | +110,416+71.8% | Added |
| Bank of America Corp | 256,110 | $1.19M | 0.00% | −74,791−22.6% | Reduced |
| Morgan Stanley | 235,246 | $1.09M | 0.00% | −703,466−74.9% | Reduced |
| Renaissance Technologies LLC | 227,726 | $1.06M | 0.00% | +202,568+805.2% | Added |
| Harbor Advisors LLC | 196,382 | $913.2K | 0.13% | 00.0% | Unchanged |
| Bridgeway Capital Management, LLC | 182,504 | $848.6K | 0.02% | −62,883−25.6% | Reduced |
| Russell Investments Group, Ltd. | 181,271 | $842.9K | 0.00% | −164,987−47.6% | Reduced |
| Tudor Investment Corp Et Al | 159,963 | $743.8K | 0.00% | +159,963 | New |
| SEI Investments Co | 156,078 | $725.8K | 0.00% | +89,360+133.9% | Added |
| Invesco Ltd. | 151,042 | $702.3K | 0.00% | −5,462−3.5% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 144,301 | $671.0K | 0.00% | +75,528+109.8% | Added |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | 139,168 | $647.1K | 0.94% | −63,843−31.4% | Reduced |
| Millennium Management LLC | 135,088 | $628.2K | 0.00% | −168,194−55.5% | Reduced |
| Legato Capital Management LLC | 130,760 | $608.0K | 0.06% | −1,860−1.4% | Reduced |
| Bank of New York Mellon Corp | 130,471 | $606.7K | 0.00% | −7,702−5.6% | Reduced |
| American Century Companies Inc | 120,540 | $560.5K | 0.00% | −3,059−2.5% | Reduced |
| XTX Topco Ltd | 116,911 | $543.6K | 0.01% | +85,853+276.4% | Added |
| Ameriprise Financial Inc | 115,045 | $535.0K | 0.00% | +115,045 | New |
| Empowered Funds, LLC | 114,004 | $530.1K | 0.00% | +114,004 | New |
| Point72 Asset Management, L.P. | 113,656 | $528.5K | 0.00% | +10,112+9.8% | Added |
| Cruiser Capital Advisors, LLC | 108,798 | $505.9K | 0.20% | +1,658+1.5% | Added |
| HSBC Holdings PLC | 102,430 | $476.3K | 0.00% | +10,390+11.3% | Added |
| Price T Rowe Associates Inc | 101,965 | $475.0K | 0.00% | +31,024+43.7% | Added |
| Engineers Gate Manager LP | 100,416 | $466.9K | 0.01% | +18,831+23.1% | Added |
| Squarepoint Ops LLC | 76,907 | $357.6K | 0.00% | +76,907 | New |
| Jump Financial, LLC | 70,598 | $328.3K | 0.00% | −14,615−17.2% | Reduced |
| Prudential Financial Inc | 70,110 | $326.0K | 0.00% | +15,770+29.0% | Added |
| Public Employees Retirement System of Ohio | 68,805 | $319.9K | 0.00% | +68,805 | New |
| Walleye Capital LLC | 67,134 | $312.2K | 0.00% | −21,150−24.0% | Reduced |
| Alliancebernstein L.P. | 37,530 | $292.0K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 56,969 | $264.9K | 0.00% | −623,472−91.6% | Reduced |
| Wells Fargo & Company | 55,324 | $257.3K | 0.00% | −30,410−35.5% | Reduced |
| Rhumbline Advisers | 53,547 | $249.0K | 0.00% | −3,924−6.8% | Reduced |
| HRT Financial LP | 50,974 | $237.0K | 0.00% | −60,728−54.4% | Reduced |
| AQR Capital Management LLC | 49,828 | $231.7K | 0.00% | −20,300−28.9% | Reduced |
| Quantinno Capital Management LP | 48,700 | $226.5K | 0.00% | −29,978−38.1% | Reduced |
| Acadian Asset Management LLC | 42,930 | $199.0K | 0.00% | +19,877+86.2% | Added |
| Quantbot Technologies LP | 38,708 | $180.0K | 0.01% | +19,467+101.2% | Added |
| GWN Securities Inc. | 36,404 | $169.3K | 0.03% | +36,404 | New |
| Deutsche Bank AG | 30,590 | $142.2K | 0.00% | +4,943+19.3% | Added |
| Lazard Asset Management LLC | 29,220 | $135.9K | 0.00% | +29,220 | New |
| Commonwealth Financial Services, LLC | 29,008 | $134.9K | 0.02% | +29,008 | New |
| State of Wyoming | 28,784 | $133.8K | 0.02% | +9,535+49.5% | Added |
| Raymond James Financial Inc | 25,656 | $119.3K | 0.00% | +25,656 | New |
| KLCM Advisors, Inc. | 23,900 | $111.1K | 0.01% | 00.0% | Unchanged |
| CIBC Asset Management Inc | 23,893 | $111.1K | 0.00% | 00.0% | Unchanged |
| Empirical Asset Management, LLC | 23,440 | $109.0K | 0.03% | +23,440 | New |
| State of Wisconsin Investment Board | 23,144 | $107.6K | 0.00% | +23,144 | New |
| Mraz, Amerine & Associates, Inc. | 21,450 | $99.7K | 0.01% | +2,500+13.2% | Added |
| Gator Capital Management, LLC | 21,435 | $99.7K | 0.02% | +21,435 | New |
| Park Capital Management, LLC | 21,262 | $98.9K | 0.10% | +21,262 | New |
| SG Americas Securities, LLC | 18,817 | $87.0K | 0.00% | −384,420−95.3% | Reduced |
| Vanguard Global Advisers, LLC | 18,651 | $86.7K | 0.00% | +18,651 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 18,273 | $85.0K | 0.00% | −879−4.6% | Reduced |
| Brevan Howard Capital Management LP | 18,197 | $84.6K | 0.00% | −2,836−13.5% | Reduced |
| Quotient Wealth Partners, LLC | 16,896 | $78.6K | 0.00% | +16,896 | New |
| Anchyra Partners LLC | 16,328 | $75.9K | 0.02% | +16,328 | New |
| Centiva Capital, LP | 16,085 | $74.8K | 0.00% | +16,085 | New |
| Axq Capital, LP | 15,436 | $71.8K | 0.01% | −24,938−61.8% | Reduced |
| Able Wealth Management LLC | 15,246 | $70.9K | 0.02% | +15,246 | New |
| Daymark Wealth Partners, LLC | 14,596 | $67.9K | 0.00% | +14,596 | New |
| Metis Global Partners, LLC | 14,334 | $66.7K | 0.00% | −10,802−43.0% | Reduced |
| Mercer Global Advisors Inc | 13,504 | $62.8K | 0.00% | +13,504 | New |
| Verition Fund Management LLC | 13,500 | $62.8K | 0.00% | −4,000−22.9% | Reduced |
| Aire Advisors, LLC | 13,446 | $62.5K | 0.01% | +13,446 | New |
| Graham Capital Management, L.P. | 13,053 | $60.7K | 0.00% | +13,053 | New |
| D. E. Shaw & Co., Inc. | 12,864 | $59.8K | 0.00% | −31,262−70.8% | Reduced |
| State Board of Administration of Florida Retirement System | 12,630 | $58.7K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 12,249 | $57.0K | 0.00% | +5,151+72.6% | Added |
| Group One Trading, L.P. | 11,948 | $55.6K | 0.00% | +11,948 | New |
| Police & Firemen's Retirement System of New Jersey | 11,825 | $55.0K | 0.00% | 00.0% | Unchanged |