JANE STREET GROUP, LLC - 31 Dec 2025 SCHEDULE 13G Report for OCTAVE SPECIALTY GROUP INC Common stock par value $0.01 per share (OSG)

Filing Manager
JANE STREET GROUP, LLC
Reporting Manager
JANE STREET GROUP, LLC
Security
OCTAVE SPECIALTY GROUP INC Common stock par value $0.01 per share
Symbol
OSG
Shares outstanding
44,032,481 shares
Disclosed Ownership
2,377,754 shares
Ownership
5.4%
Form type
SCHEDULE 13G
Filing time
11 Feb 2026, 16:51:26 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

Reporting Managers (4)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
JANE STREET GROUP, LLC 5.4% 2,377,754 0 2,377,754 /s/ Jeremy Kahn Jeremy Kahn (Authorized Signatory)
Jane Street Capital, LLC 1.5% 634,716 0 634,716 /s/ Jeremy Kahn Jeremy Kahn (Authorized Signatory)
Jane Street Options, LLC 3.4% 1,472,859 0 1,472,859 /s/ Jeremy Kahn Jeremy Kahn (Authorized Signatory)
Jane Street Global Trading, LLC 0.6% 270,179 0 270,179 /s/ Jeremy Kahn Jeremy Kahn (Authorized Signatory)