Sedgwick Group will acquire Crump Cos.

The London-based firm, one of the world’s largest insurance brokerage companies, will buy all of the Memphis, Tenn.-based company for $33 a share cash, or a total of $307 million. The deal, which was approved by the boards of both firms, is expected to be completed by the end of the year. Sedgwick acquired Fred S. James, a New York insurance brokerage, a year ago.