- A Direct Connection, Inc.
- A. Douglas Smith Jr. Lodge of Research
- A.G. Edwards and Sons, Inc., VA
- Abbott Laboratories, Ross Products Division
- Ace Electric Company Inc.
- ACE Uniform and Services of Virginia Inc.
- ACHCA
- Acorn Sales Company Inc.
- Adult Companion Care
- Advanced Foundations and Advanced Water Proofing
- Advanced Orthopedic Centers
- Advanced Solutions International, Inc.
- Advanced Technology Systems Company
- Aerospace Industries Association
- AgilQuest Corp.
- AIKO
- Air Conditioning Contractors of America
- Air Force Association
- Air Line Pilots Association International
- Air-Conditioning and Refrigeration Institute
- Airport Consultants Council
- Ajilon
- Albuquerque Convention and Visitors Bureau
- Alexandria Chapter House - American Red Cross
- Alexandria Gazette Packet
- Alexandria Toyota
- Alliance Engineering Inc.
- Allie Bowing
- Alstom Power
- Altria
- Ambassadors Services Group, Inc.
- American Academy of Audiology
- American Academy of Nephrology Pas
- American Academy of Physician Assistants
- American Apparel and Footwear Association
- American Association for the Study of Liver Disease
- American Association of Motor Vehicle Administrators
- American Association of Pastoral Counselors
- American Association of Tissue Banks
- American Board for Certification in Orthotics and Prosthetics
- American Chemistry Council
- American Chiropractic Association
- American College of Osteopathic Surgeons
- American College of Radiology
- American Composites Manufacturers Association
- American Congress of Rehabilitation Medicine
- American Diabetes Association
- American Electric Power
- American Express Financial Advisors
- American Family Fitness