- A Ride Across America
- Abbot Vascular
- Abbott
- Academy of Motion Picture Arts and Science
- AccessClosure
- Adventist Health and Rideout
- Adventist Health Bakersfield
- Adventist Health Delano
- Adventist Health Feather River
- Adventist Health Glendale
- Adventist Health Hanford
- Adventist Health Medical Office - Hanford
- Adventist Health Reedley
- Adventist Health Selma
- Adventist Health Simi Valley
- Adventist Health Specialty Bakersfield
- Adventist Health St. Helena Hospital
- Adventist Health Tehachapi
- Adventist Health White Memorial
- Adventist Medical Center Central Valley Network
- Adventure Christian Church
- Aera Energy LLC
- Agfa Corporation
- Agilent Technologies Inc.
- Ainahau O Kaleponi Hawaiian Civic Club
- AIS
- Alameda Health System
- Alameda Hospital
- Alhambra Hospital Medical Center
- Alliance for Donation, Transplantation, Awareness and Support ADTAS)
- Alta Bates Summit Medical Center
- Alvarado Hospital Medical Center
- Alvarion
- Amed
- American Association for International Aging
- American Association of Critical-Care Nurses
- American Business Machines
- American Massage Therapy Association
- American Plastic Council
- American Press Service and Feature Syndicate
- American Red Cross Bay Area Chapter
- American River College Health Center
- American Society on Aging
- American Viet League Hiep Hoi My Viet)
- Americna Management Association San Francisco
- Ami Adini
- AMS Incorporated
- ANA Comp
- Anaheim Global Medical Center
- Anaheim Regional Medical Center