- Apple Healthcare
- Apple Rehab
- Appriss
- Appriss Health
- APRN
- Arba Group
- Arbitration
- Arbor Realty Trust
- Arbor Research Collaborative for Health
- Arboreta Healthcare
- Arbors of Hop Brook
- Arbour Heights
- Arcadia Care
- Archangels
- ArchCare
- Archway Health
- Arcus Healthcare Partners
- Area Agency on Aging Association of Michigan
- Arena Analytics
- Arent Fox LLP