Security key
023139884
OCTAVE SPECIALTY GROUP INC - Common Stock (OSG)
CUSIP: 023139884
Q3 2025 13F Holders as of 30 Sep 2025
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 36,420,483
- Total 13F value
- $303,620,140
- Share change
- +233,567
- Put/Call ratio
- 10%
- SEC-reported price per share
- $8.34
- Number of holders
- 126
- Value change
- +$5,517,493
- Number of buys
- 63
- Number of sells
- 80
- Shares outstanding
- 45,039,266
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
126
Top holders
10
OSG full security history
Ownership snapshot
Full 13F holder table
OCTAVE SPECIALTY GROUP INC SEC filings
OCTAVE SPECIALTY GROUP INC company facts
Broader feeds
Ownership snapshot
Top reported holders of OSG - OCTAVE SPECIALTY GROUP INC - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
15/15
Latest evidence
30 Sep 2025
13F
13D/G
Lead comparable stake: 7.6%
13D/G row: BlackRock, Inc.
Showing 1-6 of 15 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 7.6%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
7.6%
DIMENSIONAL FUND ADVISORS LP
4.6%
SUSQUEHANNA SECURITIES, LLC
2.2%
VANGUARD GROUP INC
5.7%
FMR LLC
3.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
7.6%
from 13D/G
|
$32,575,182
4,588,054 shares
|
— | 30 Jun 2025 |
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
4.6%
|
$17,855,690
2,141,047 shares
|
$0 | 30 Sep 2025 |
| SUSQUEHANNA SECURITIES, LLC |
13D/G
G1 Execution Services, LLC
|
2.2%
|
$8,484,349
1,017,308 shares
|
-$11,354,702 | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
Company
|
5.7%
|
$18,235,924
2,568,440 shares
|
— | 30 Jun 2025 |
| FMR LLC |
13F
Company
|
3.4%
|
$10,881,778
1,532,645 shares
|
— | 30 Jun 2025 |
| CONTINENTAL GENERAL INSURANCE CO |
13F
Company
|
2.7%
|
$8,650,278
1,218,349 shares
|
— | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
126
Shares
36,420,483
Rows available
126
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
145
Q3 2025 holders
126
Holder diff
-19
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|