On October 2, 2012, private equity firm Advent International acquired a majority interest in AOT Bedding Super Holdings (now Serta Simmons Holdings, LLC), the parent company of Simmons and Serta. Ares Management and the Ontario Teachers' Pension Plan continued to own a "significant" share of company equity. At the time of the Advent acquisition, Simmons and Serta together held a 34 percent share of the U.S. mattress market. Simmons and Serta retained separate sales, marketing, research and development, and merchandising departments, and continue to remain separate.