Spital Netz Bern AG operates hospitals. It comprises five public hospitals: Aarberg, Münsingen, Riggisberg, Tiefenau, and Ziegler; Belp Hospital and Retirement Home; and Elfenau Care Center, a residential care center. Spital Netz Bern AG is based in Bern, Switzerland. As of June 18, 2015, Spital Netz Bern AG operates as a subsidiary of Inselspital, University Hospital Bern. Spital Netz Bern AG changed its name to Insel Gruppe AG as a result of this acquisition.