Wynnchurch Capital, a middle market private equity firm, completed an investment in Mattress Warehouse, an independent mattress retailer. Financial terms were not disclosed. “We are very excited about the investment in the Mattress Warehouse team by Wynnchurch Capital. With over $4bn under management, Wynnchurch brings a wide range of expertise, and a focus on accelerating growth across companies in the consumer space as we strive towards our goal to reach over 500 locations,” Bill Papettas, Mattress Warehouse CEO and President.