The Eastern Alliance is aiming to extend its membership and appoint a new shareholding company.
Chief executive Grant Taylor said he wanted to "stir the pot and bring some different strategies" to the East Anglia-based network.
Formed in 1999, the network's seven founding members were each appointed as shareholders.
Taylor said it was now ready to extend into the South East.
He added that he had no plans to cap the number of members, but said: "We must give each member the right geographical spread because we have no anti-competition agreement."
Taylor said he was looking for commercial-focused brokers with annual GWP of between £10m and £20m, adding that members would retain their independence.
