Arthur J. Gallagher, a global insurance brokerage, risk management and consulting services firm, completed the acquisition of Benchmark Commercial Insurance Services, a retail insurance agency. Financial terms were not disclosed. "Benchmark is a well-regarded, client-focused agency that enhances our growth opportunities in Southern California. I am very pleased to welcome Robert and his associates to our growing, global team," J. Patrick Gallagher, Arthur J. Gallagher & Co, Chairman, President and CEO.