Octave Specialty Group (NYS: OSG)

Ambac Financial Group is an insurance company based in New York City, New York. Established in 1971, the company is a provider of financial guarantee products and other financial services to clients in the public and private sectors worldwide. Its subsidiaries include Ambac Assurance Corporation, a guarantor of public finance and structured finance obligations in a run-off. The assets of the company are managed by the executive team.