| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 7.6% | -12% | $29,497,691 | -$3,891,879 | 3,535,664 | -12% | BlackRock, Inc. | 30 Sep 2025 |
| VANGUARD GROUP INC | 5.8% | -15% | $20,621,836 | -$4,302,536 | 2,660,882 | -17% | The Vanguard Group | 31 Mar 2025 |
| Western Standard LLC | 5.9% | $16,360,757 | 2,572,446 | Western Standard LLC | 20 Nov 2025 | |||
| JANE STREET GROUP, LLC | 5.4% | $15,122,515 | 2,377,754 | JANE STREET GROUP, LLC | 31 Dec 2025 | |||
| DIMENSIONAL FUND ADVISORS LP | 4.6% | $17,855,690 | 2,141,047 | Dimensional Fund Advisors LP | 30 Sep 2025 | |||
| SUSQUEHANNA SECURITIES, LLC | 2.2% | -58% | $8,484,349 | -$11,354,702 | 1,017,308 | -57% | G1 Execution Services, LLC | 30 Sep 2025 |
As of 31 Dec 2025, 104 institutional investors reported holding 28,278,506 shares of OCTAVE SPECIALTY GROUP INC - Common Stock, $0.01 par value per share (OSG). This represents 65% of the company’s total 43,823,612 outstanding shares.
The largest institutional shareholders of OCTAVE SPECIALTY GROUP INC - Common Stock, $0.01 par value per share (OSG) together control 59% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10% | 4,488,468 | -0.11% | 0% | $34,920,281 |
| VANGUARD GROUP INC | 5.7% | 2,508,395 | -1.8% | 0% | $19,515,314 |
| Western Standard LLC | 5.7% | 2,504,627 | -5.2% | 9% | $19,485,998 |
| Wolf Hill Capital Management, LP | 4.3% | 1,888,973 | +63% | 1.7% | $14,696,210 |
| DIMENSIONAL FUND ADVISORS LP | 3.8% | 1,685,627 | -21% | 0% | $13,114,300 |
| GENDELL JEFFREY L | 3.6% | 1,569,472 | -16% | 0.21% | $12,210,492 |
| JANE STREET GROUP, LLC | 3.5% | 1,520,654 | +79% | 0.01% | $11,830,688 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3% | 1,024,547 | -3.4% | 0% | $7,972,836 |
| STATE STREET CORP | 2.2% | 943,368 | -2.5% | 0% | $7,339,403 |
| MORGAN STANLEY | 2.1% | 938,712 | +384% | 0% | $7,303,178 |
| Prescott Group Capital Management, L.L.C. | 2% | 893,517 | -0.27% | 0.65% | $6,951,562 |
| Nuveen, LLC | 1.8% | 810,279 | -25% | 0% | $6,303,971 |
| THIRD AVENUE MANAGEMENT LLC | 1.8% | 782,093 | +30% | 1.1% | $6,084,684 |
| GOLDMAN SACHS GROUP INC | 1.8% | 779,975 | +49% | 0% | $6,068,205 |
| MARSHALL WACE, LLP | 1.7% | 748,572 | +64% | 0.01% | $5,823,892 |
| BARCLAYS PLC | 1.6% | 680,441 | +1.6% | 0% | $5,293,831 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 0.94% | 410,822 | 0.49% | $3,196,195 | |
| SG Americas Securities, LLC | 0.92% | 403,237 | +435% | 0% | $3,137,000 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.82% | 361,424 | -5.5% | 0% | $2,811,879 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 0.54% | 237,185 | 0.01% | $1,845,299 | |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | 0.46% | 203,011 | 0% | 0.23% | $1,579,426 |
| Harbor Advisors LLC | 0.45% | 196,382 | 0% | 0.23% | $1,527,852 |
| VELA Investment Management, LLC | 0.41% | 178,752 | -0.74% | 0.37% | $1,390,691 |
| Empowered Funds, LLC | 0.37% | 160,387 | -32% | 0.01% | $1,247,811 |
| UBS Group AG | 0.35% | 153,864 | -45% | 0% | $1,197,062 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 28,278,506 | $220,009,297 | -$1,103,977 | $7.78 | 104 |
| 2025 Q3 | 36,420,483 | $303,620,140 | +$5,517,785 | $8.34 | 126 |
| 2025 Q2 | 36,967,187 | $262,451,287 | -$6,275,007 | $7.10 | 145 |
| 2025 Q1 | 37,285,182 | $325,247,075 | -$39,529,091 | $8.75 | 170 |
| 2024 Q4 | 41,463,461 | $522,340,751 | +$15,664,277 | $12.65 | 179 |
| 2024 Q3 | 40,273,968 | $449,624,914 | +$10,695,609 | $11.21 | 179 |
| 2024 Q2 | 38,733,238 | $496,535,322 | +$10,201,544 | $12.82 | 182 |
| 2024 Q1 | 37,851,350 | $591,468,537 | -$4,976,804 | $15.63 | 172 |
| 2023 Q4 | 38,145,550 | $628,407,255 | +$31,651,145 | $16.48 | 174 |
| 2023 Q3 | 36,343,104 | $438,745,752 | -$11,313,309 | $12.06 | 166 |
| 2023 Q2 | 37,227,104 | $529,566,033 | -$22,316,812 | $14.24 | 159 |
| 2023 Q1 | 38,580,360 | $596,164,176 | +$63,723,924 | $15.48 | 156 |
| 2022 Q4 | 34,499,926 | $600,947,413 | +$62,491,641 | $17.44 | 165 |
| 2022 Q3 | 31,445,947 | $401,072,377 | -$34,274,712 | $12.75 | 148 |
| 2022 Q2 | 36,839,151 | $417,676,977 | -$31,197,327 | $11.35 | 137 |
| 2022 Q1 | 37,774,546 | $392,130,695 | -$17,253,058 | $10.40 | 140 |
| 2021 Q4 | 37,338,742 | $598,873,108 | +$13,548,357 | $16.05 | 129 |
| 2021 Q3 | 36,051,024 | $516,212,696 | -$1,311,166 | $14.32 | 126 |
| 2021 Q2 | 36,096,104 | $565,003,596 | -$9,221,478 | $15.66 | 122 |
| 2021 Q1 | 36,524,284 | $611,655,331 | -$28,313,721 | $16.74 | 135 |
| 2020 Q4 | 37,401,411 | $575,050,561 | -$4,694,044 | $15.38 | 134 |
| 2020 Q3 | 36,718,299 | $468,543,199 | -$11,638,357 | $12.77 | 127 |
| 2020 Q2 | 37,390,881 | $535,312,958 | +$19,443,291 | $14.32 | 133 |
| 2020 Q1 | 35,974,950 | $443,933,094 | -$8,960,245 | $12.34 | 120 |
| 2019 Q4 | 36,664,639 | $790,583,535 | +$9,354,161 | $21.57 | 130 |
| 2019 Q3 | 36,012,222 | $703,986,865 | -$23,174,466 | $19.55 | 124 |
| 2019 Q2 | 37,365,566 | $629,594,318 | +$17,090,478 | $16.85 | 129 |
| 2019 Q1 | 36,429,892 | $660,092,503 | -$23,814,953 | $18.12 | 151 |
| 2018 Q4 | 38,125,046 | $657,191,596 | +$41,689,872 | $17.24 | 142 |
| 2018 Q3 | 35,349,709 | $721,784,264 | -$25,492,986 | $20.42 | 153 |
| 2018 Q2 | 36,584,891 | $726,245,584 | +$52,129,757 | $19.85 | 143 |
| 2018 Q1 | 34,322,029 | $538,042,869 | +$6,516,697 | $15.68 | 111 |
| 2017 Q4 | 34,019,895 | $543,583,390 | +$14,236,661 | $15.98 | 113 |
| 2017 Q3 | 31,755,643 | $548,132,061 | -$23,887,203 | $17.26 | 117 |
| 2017 Q2 | 33,154,459 | $575,188,561 | -$6,751,505 | $17.35 | 125 |
| 2017 Q1 | 33,360,004 | $629,149,540 | +$44,338,708 | $18.86 | 142 |
| 2016 Q4 | 32,791,759 | $737,764,333 | -$6,130,280 | $22.50 | 148 |
| 2016 Q3 | 32,064,545 | $589,656,481 | -$8,127,283 | $18.39 | 118 |
| 2016 Q2 | 32,596,504 | $536,526,933 | +$9,337,208 | $16.46 | 124 |
| 2016 Q1 | 32,173,912 | $508,240,305 | -$24,875,093 | $15.80 | 114 |
| 2015 Q4 | 34,137,929 | $480,990,372 | -$6,432,182 | $14.09 | 126 |
| 2015 Q3 | 34,642,114 | $501,121,270 | -$6,297,784 | $14.47 | 124 |
| 2015 Q2 | 34,791,281 | $578,734,495 | -$43,337,961 | $16.64 | 124 |
| 2015 Q1 | 34,121,176 | $825,674,265 | -$16,973,261 | $24.20 | 121 |
| 2014 Q4 | 32,996,996 | $808,275,251 | -$51,659,995 | $24.50 | 121 |
| 2014 Q3 | 34,685,451 | $765,847,490 | -$49,754,474 | $22.10 | 116 |
| 2014 Q2 | 36,183,801 | $987,478,921 | +$8,599,045 | $27.31 | 124 |
| 2014 Q1 | 35,791,791 | $1,109,815,486 | +$86,633,202 | $31.03 | 134 |