13F reference period
Q3 2026
Security Snapshot
OCTAVE SPECIALTY GROUP INC - Common Stock (OSG) Institutional Ownership
CUSIP: 023139884
13F Institutional Holders and Ownership History from Q1 2014 to Q3 2026
Institutions Reporting
60
Shares (Excl. Options)
13.5M
Full value: 13,497,092 · shares · 30 Sep 2026Price
$4.14
The headline uses the Q3 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended.
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- Security type / class
- Equity / Common Stock
- Symbol
- OSG on NYSE
- All holders as of 30 Sep 2026
- Q3 2026
- Total 13F shares
- 13,497,092
- Total 13F value
- $55,908,905
- Portfolio coverage rank
- 0%
- Share change
- -2,107,314
- Value change
- -$12,764,744
- Number of holders
- 60
- Shares outstanding
- 45,066,646
- SEC-reported price per share
- $4.14
- Insider filing price
- $4.14
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- OSG - OCTAVE SPECIALTY GROUP INC - Common Stock is tracked under CUSIP 023139884.
- 60 institutions reported positions in Q3 2026.
- 7 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 147 to 60 between Q2 2026 and Q3 2026.
- SEC-reported value moved from to
$187.56M
Full value: $187,560,530 · USD · 30 Jun 2026.$55.91M
Full value: $55,908,905 · USD · 30 Sep 2026
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 60 institutions filings for Q3 2026.
Security key
023139884
13F reference period
Q3 2026
13F holders
60
13D/G owners
7
CIK / CUSIP context first
Open Q3 2026 holders
OSG full holder history
OCTAVE SPECIALTY GROUP INC SEC filings
OCTAVE SPECIALTY GROUP INC company facts
OCTAVE SPECIALTY GROUP INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 023139884:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
7
Security
OSG
| 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 |
| BlackRock Portfolio Management LLC | 6.5% | $12,166,784 | 2,938,198 | BlackRock Portfolio Management LLC | 30 Sep 2026 | |||
| Western Standard LLC | 5% | -15% | $10,451,298 | -$1,510,576 | 2,247,591 | -13% | Western Standard LLC | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.8% | -4.8% | $8,957,158 | -$442,144 | 2,163,199 | -4.7% | Vanguard Capital Management | 30 Sep 2026 |
| 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 |
| JANE STREET GROUP, LLC | 1.7% | -74% | $3,586,936 | -$7,469,620 | 771,384 | -68% | JANE STREET GROUP, LLC | 31 Mar 2026 |
As of 30 Sep 2026,
60
institutional investors reported holding
shares of
OCTAVE SPECIALTY GROUP INC - Common Stock (OSG).
This represents
30%
of the company’s total
outstanding shares.
13.5M
Full value: 13,497,092 · shares · 30 Sep 202645.07M
Full value: 45,066,646 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
29%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Western Standard LLC | 5% | 2,247,591 | 0% | 2.4% | $9,305,027 |
| Prescott Group Capital Management, L.L.C. | 4.3% | 1,930,145 | +17% | 0.72% | $7,990,800 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.2% | 1,876,593 | -4.9% | 0% | $7,769,095 |
| THIRD AVENUE MANAGEMENT LLC | 3% | 1,341,879 | 0% | 0.93% | $5,555,379 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 932,067 | -16% | 0% | $3,859,881 |
| STATE STREET CORP | 2% | 910,834 | +1.4% | 0% | $3,770,853 |
| DIMENSIONAL FUND ADVISORS LP | 1.1% | 495,068 | -31% | 0% | $2,049,421 |
| MORGAN STANLEY | 1% | 449,701 | -21% | 0% | $1,861,763 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.88% | 398,626 | +1.6% | 0% | $1,650,312 |
| MARSHALL WACE, LLP | 0.87% | 390,938 | -35% | 0% | $1,618,485 |
| Connor, Clark & Lunn Investment Management Ltd. | 0.83% | 376,036 | +24% | 0% | $1,556,789 |
| IPG Investment Advisors LLC | 0.66% | 299,427 | -1.5% | 0.18% | $1,239,628 |
| VANGUARD FIDUCIARY TRUST CO | 0.63% | 284,908 | -3.7% | 0% | $1,179,519 |
| RAYMOND JAMES FINANCIAL INC | 0.51% | 230,366 | -3.9% | 0% | $953,715 |
| LPL Financial LLC | 0.48% | 214,990 | 0% | $890,059 | |
| RENAISSANCE TECHNOLOGIES LLC | 0.37% | 164,800 | +41% | 0% | $682,272 |
| Quantinno Capital Management LP | 0.33% | 149,060 | -22% | 0% | $617,108 |
| Invesco Ltd. | 0.24% | 106,208 | -17% | 0% | $439,701 |
| Vanguard Global Advisers, LLC | 0.24% | 106,081 | +68% | 0% | $439,175 |
| Empowered Funds, LLC | 0.22% | 98,448 | +82% | 0% | $407,575 |
| AMERICAN CENTURY COMPANIES INC | 0.2% | 91,008 | +0.01% | 0% | $376,773 |
| BNP PARIBAS FINANCIAL MARKETS | 0.11% | 47,808 | 0% | $197,925 | |
| IMC-Chicago, LLC | 0.08% | 36,347 | 0% | $150,477 | |
| DEUTSCHE BANK AG\ | 0.08% | 35,258 | -13% | 0% | $145,968 |
| LOS ANGELES CAPITAL MANAGEMENT LLC | 0.06% | 28,836 | -40% | 0% | $119,381 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
51
Headline period
Q3 2026
Rows shown
1-25 of 51
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 13,497,092 | $55,908,905 | -$12,764,744 | $4.14 | 60 |
| 2026 Q2 | 30,067,995 | $187,560,530 | -$12,044,401 | $6.24 | 147 |
| 2026 Q1 | 32,501,333 | $151,121,884 | -$13,743,220 | $4.65 | 146 |
| 2025 Q4 | 34,704,270 | $270,000,146 | -$15,016,916 | $7.78 | 144 |
| 2025 Q3 | 36,420,483 | $303,620,140 | +$5,517,493 | $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 |