Spital Netz Bern AG operates hospitals. It encompasses five public hospitals, Aarberg, Münsingen, Riggisberg, Tiefenau, Ziegler; Spital und Altersheim Belp, a hospital and retirement home; and Pflegezentrum Elfenau, a residential care centre. Spital Netz Bern AG is based in Bern, Switzerland. As of June 18, 2015, Spital Netz Bern AG operates as a subsidiary of Inselspital, Universitätsspital Bern. Spital Netz Bern AG changed its name to Insel Gruppe AG as a result of acquisition.