WHITE PLAINS, N.Y.--(BUSINESS WIRE)--Marsh & McLennan Agency LLC (MMA), a subsidiary of Marsh, today announced it has acquired St. Louis, Missouri-based J.W. Terrill, one of the largest independent agencies in the Midwest. Terms of the transaction were not disclosed. With this acquisition, MMA expands its growing national footprint into Missouri and reinforces its commitment to building one of the nation’s preeminent insurance agencies serving the risk management and employee benefits needs