SanStone ???

Who is SanStone, and what do they actually do. You see their advertising on WLOS tv in Asheville. I have been looking at these people for a long time. The Hendersonville Times News says Pardee Hospital sold Pardee Care Center to Hendersonville Physicians and Associates. The associates part is the Sprenger family from Ohio.
 According to Medicare.gov, the operating company is Ardent Health and Rehabilitation. The Ownership is a long list of Sprengers , Flat Rock Management Company , BSH , Bluesky Healthcare , Hendersonville Physicians and associates, and a long list of names , some of them recognizable as local doctors. So who is SanStone? There is no mention of SanStone on the Medicare.gov website.
From what I can find, SanStone has nothing to with Hendersonville Health and Rehabilitation. Yet they spend all that money advertising for them? There is nothing listed on the NC Secretary of State website about SanStone health and Rehabilitation. There is a SanStone aviation and a SanStone hosiery. I'm somewhat confused as to why they are advertising for something that doesn't even exist.
 In their ads, they tell you how great their facilities are, and how they treat you like family. I guess that means you get partial ownership interest in the facility?
If they are so great, how come no one admits to ownership? How come Christopher Sprenger and Michael Deloach are listed as managing employees? My guess would be that they are drawing a salary from each of the SanStone facilities. But wait who is SanStone?