Octave Specialty Group

Octave Specialty Group (NYSE: OSG, formerly Ambac Financial Group) is a publicly traded global specialty insurance holding company headquartered in New York City that builds, buys, and scales niche insurance distribution and underwriting businesses through its portfolio of managing general agents (MGAs) and specialty underwriting platforms. With a focus on operational excellence, disciplined growth, and innovation, Octave operates a harmonized portfolio of specialty insurance companies across the U.S. and U.K., including accident and health MGUs and specialty property and casualty lines. The company completed its transformation from a legacy financial guarantee insurer into a pure-play MGA and specialty insurance platform in 2025 following the sale of its legacy Ambac Assurance businesses to Oaktree Capital Management.