Originally founded as the American Municipal Bond Assurance Corporation, the name Ambac evolved into the official corporate title Ambac Financial Group. As a pioneer in the financial guarantee and municipal bond insurance sector, the corporation built its legacy on backing public finance instruments. Following a comprehensive multi-year strategic transformation, the company shifted away from its legacy bond insurance model to focus entirely on specialty property and casualty underwriting, eventually rebranding its corporate identity to Octave Specialty Group.