The new company, Adding1, which has an office in La Chasse Chambers off Colomberie, has been open since October and already employs 15 members of staff.
The company has secured a five-year renewable contract as a commercial insurance partner of AIG Europe (UK) Ltd, targeting small and medium-sized firms.
Initially it will be marketing motor fleet insurance and commercial combined insurance through a network of UK brokers.
The name at the head of the company is Julie Rodilosso, the founder and former chief executive of IT and marketing services firm Rarrigini & Rosso.
Now a Jersey resident, Ms Rodilosso sold her company in 2003 to AIM-listed Lloyds broker THB Group plc for £12 million.