For more than 100 years, Calhoun Companies has helped small- to medium-sized businesses leverage their assets and realize their goals through its business brokerage, commercial real estate, mergers and acquisitions, and business valuation services. mrs nellie nelsonIn 1908, Nellie Mason, one of the nation’s first female real estate brokers, founded Calhoun Companies with an emphasis on integrity and service. The emphasis proved successful: We grew to become the leading business brokerage firm in the Midwest. As our reputation has grown, so has our reach – Calhoun Companies has expanded to serve clients across the globe.