Broker Stuart Alexander has acquired Weymouth-based Weysure for an undisclosed sum.
Only three members of the six-strong Weysure team will join Stuart Alexander's Bournemouth office.
As a result of the acquisition, the Bournemouth office will have a premium income of £4.5m, with the Weysure team contributing around 25%.
Stuart Alexander joint managing director Stuart Reid said: "Weysure's strength in commercial business was particularly attractive to us."
The Weysure deal is Stuart Alexander's twelfth acquisition in five years, and Reid refused to rule out further deals.
"We're talking to a few other brokers on the South Coast," he said.
"I think we will see a lot more activity in the broker market because many smaller brokers are concerned about FSA compliance issues."