The following are prominent businesses beginning with the letter A.
- Alpha Natural Resources
- Abercrombie & Fitch Co.
- Anne Klein & Company
- Access Midstream Partners
- APMEX
- Amazon
- Aspect
- Aflac Incorporated
- ACE Group Ltd
- Avid
- ACI Worldwide
- Arch Capital Group Ltd
- Advance Auto Parts
- Access Business Group LLC
- Activision Blizzard, Inc.
- Arbonne International, LLC
- Adobe
- AvalonBay Communities, Inc.
- American Capital Ltd.
- Archer Daniels Midland
- Anacomp Inc.
- Adapteva Inc.
- AMAX
- Altair Engineering
- Appirio
- AkzoNobel
- Affinia Group Inc.
- Atlas Travel & Technology LTD
- Assurant, Inc.
- Avo Construction