The core activity of the Stiftung Rosenau company consists of the sponsorship and operation of old-age and nursing homes, in particular the old-age and nursing home Rosenau (APH Rosenau), which, however, has been continued by Bethesda Alterszentren AG since the beginning of 2015. The Stiftung Rosenau now focuses on ensuring the pastoral mandate and promoting Catholic teaching and understanding in the field of elderly and nursing care.