- American Red Cross
- American Red Cross Bay Area Chapter
- American Red Cross of Southeast Michigan
- American Registry for Internet Numbers
- American River College Health Center
- American Security Group
- American Society For Clinical Pathology
- American Society for Clinical Pharmacology and Therapeutics
- American Society for Investigative Pathology
- American Society for Parenteral and Enteral Nutrition
- American Society for Quality, Section 1205
- American Society for Surgery of the Hand
- American Society for Therapeutic Radiology and Oncology
- American Society of Association Executives
- American Society of Consultant Pharmacists
- American Society of Health System Pharmacists
- American Society of Mechanical Engineers
- American Society of Nephrology
- American Society of Pediatric Nephrology
- American Society of Pension Professionals and Actuaries
- American Society of Safety Professionals
- American Society of Transplant Surgeons
- American Society of Transplantation
- American Society on Aging
- American Solar Energy Society
- American Soybean Association
- American Sportscaster
- American Standard
- American Statistical Association
- American Subcontractors Association
- American Trust and Savings Bank
- American Urological Association
- American Viet League Hiep Hoi My Viet)
- American Water Resources Association
- American Water Works Association
- American Water Works, Inc
- American Way Van and Storage, Inc.
- American Wind Energy Association
- AmericaWorkVisa AWV)
- Americna Management Association San Francisco
- Americo, Inc.
- Amerigroup
- Ameritex Linen, Inc.
- AMETEK, Inc.
- AMGEN, Inc.
- Ami Adini
- AMITA Health Adventist Hospital Hinsdale
- AMITA Health Adventist Medical Center Bolingbrook
- AMITA Health Adventist Medical Center GlenOaks
- AMITA Health Adventist Medical Center La Grange