- Alcoa Technical Center
- Alcona Citizens for Health, Inc.
- Alegent Health
- Alenza
- Alert Alarm of Hawaii
- Alexandria Chapter House - American Red Cross
- Alexandria Gazette Packet
- Alexandria Toyota
- Alexandria VA Health Care System
- Alexian Brothers Medical Center
- Alhambra Hospital Medical Center
- Alhambra Investments
- Alice Peck Day Memorial Hospital
- All Hours Computer Solutions, Inc.
- ALL Masonry Construction Company Inc.
- All Systems Communications
- Allegan County United Way
- Allegan General Hospital
- Allegany County Department of Tourism
- Allegany County United Way
- Allegheny County Bar Association
- Allegheny General Hospital
- Allegheny General Hospital-Suburban Campus
- Allegheny Intermediate Unit
- Allegheny Valley Hospital
- Allen and Partners, Inc.
- Allen Parish Hospital
- Allergy Partners
- Allfirst Bank
- Alliance Benefits and Compensation, LLC
- Alliance Data Systems
- Alliance Engineering Inc.
- Alliance for Donation, Transplantation, Awareness and Support ADTAS)
- Alliance for Donation-Donate Life New York State
- Alliance for Organ Donation and Transplantation
- Alliance for Telecommunications Industry Solutions ATIS)
- Alliance for Unity
- Alliance Healthcare
- Alliance of Automobile Manufacturers
- Alliance-Carolina Tool and Mold Corporation
- AllianceHealth Durant
- AllianceHealth Ponca City
- Alliant Energy
- Alliant Techsystems
- Allie Bowing
- Allied Purchasing Co.
- Allies In Caring, Inc.
- Allograft Resources
- Allsteel
- Allsteel