- AMITA Health Mercy Medical Center Aurora
- AMITA Health Saint Francis Hospital Evanston
- AMITA Health Saint Joseph Hospital Chicago
- AMITA Health Saint Joseph Hospital Elgin
- AMITA Health Saint Joseph Medical Center Joliet
- AMITA Health Saints Mary and Elizabeth Medical Center Chicago
- AMITA Health St. Alexius Medical Center
- AMITA Health St. Mary's Hospital Kankakee
- AMK Drives and Controls Inc.
- Ammonoosuc Community Health Services, Inc.
- AMP Management Services
- Ampco-Pittsburgh Corporation
- AMPEX
- Amplatzer Medical
- AMR Las Vegas
- AMS Incorporated
- AMU
- Amway Grand Plaza
- ANA Comp
- Anaheim Global Medical Center
- Anaheim Orange County Visitors Bureau
- Anaheim Regional Medical Center
- Analytical Computer Services
- Anasteel and Supply Co. LLC
- Anchor Glass Containers Corporation
- Anchorage Convention and Visitors Bureau
- Ancira Enterprises Inc.
- Andalusia Health
- Anderson Auto Group
- Anderson Communications
- Anderson County Government
- Anderson Regional Medical Center North
- Anderson Regional Medical Center South
- Anderson Security
- Andre's Serenity Family Mortuary and Methodist College
- Andrews
- Androscoggin Valley Hospital
- Andrus on Hudson Retirement Community
- Angel Medical Center
- Angelic Community Resource Development
- AngioScore
- Animal Welfare League of Alexandria
- AnMed Health
- AnMed Health Clemson Family Medecine
- Ann & Robert H. Lurie Children's Hospital of Chicago
- Anna Belle Rose Home Decor Store
- Anna Jaques Hospital
- Annapolis and Anne Arundel County Conference and Visitors Bureau
- Annie Jeffrey Memorial County Health Center
- AnnMed Health Cannon