SCHEDULE 13G/A

Octave Specialty Group Inc

Common Stock, $0.01 par value per share · CUSIP: 023139884

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• G1 Execution Services, LLC

  Shares: 1,017,308 · Class: 2.2%

• SIG Brokerage, LP

  Shares: 1,017,308 · Class: 2.2%

• Susquehanna Securities, LLC

  Shares: 1,017,308 · Class: 2.2%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.