Octave Specialty Group, Inc. operates as a financial services holding company. It operates in two segments, Specialty Property and Casualty Insurance; and Insurance Distribution. The Specialty Property and Casualty Insurance segment provides specialty property and casualty program insurance with a focus on commercial and personal liability risks. The Insurance Distribution segment offers specialty property and casualty insurance distribution services, which include managing general agents, underwriters, insurance broker, and other distribution and underwriting businesses. The company was formerly known as Ambac Financial Group, Inc. and changed its name to Octave Specialty Group, Inc. in November 2025. The company was founded in 1971 and is headquartered in New York, New York.