Ambac Financial Group rebrands as Octave Specialty Group

Ambac Financial Group has rebranded to Octave Specialty Group. The company will begin trading under its new ticker symbol “NYSE: OSG” on November 20, 2025.

The rebrand follows the sale of the company’s legacy financial guarantee business and signals Octave’s singular focus on building and acquiring high-performing MGA businesses across the U.S., U.K., and Bermuda.

As part of the rebrand, the company’s holding entity will operate as Octave Specialty Group. Its subsidiaries Cirrata Group and Beat Capital Partners will be rebranded to Octave Partners, and Octave Ventures, respectively. The company’s MGAs and its hybrid fronting carrier, Everspan Group, will continue to operate under their existing brands.

“Octave represents both the culmination of our multi-year transformation and the beginning of a bold new journey. We are now a dynamic, diversified specialty insurance enterprise – harmonizing entrepreneurial, high-performing businesses under one shared vision. Octave captures who we are today — a family of unique, entrepreneurial businesses working in concert to deliver sustainable growth and long-term value.” – Claude LeBlanc, President and Chief Executive Officer of Octave Specialty Group.