crowd forming people and umbrella Brokerages have been aggressively merging to diversify, boost commissions and serve customers who increasingly want to deal with fewer intermediaries. (Photo: Shutterstock)

(Bloomberg) –Aon Plc is considering an offer to buy rival insurance brokerage Willis Towers Watson Plc, according to people familiar with the matter, in what could be the industry's largest ever merger.

Aon is preparing to submit a bid for Willis Towers in the coming weeks, said the people, who asked to not be identified because the matter isn't public. The companies have held preliminary talks, the people said.

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