• Adrian Lee & Partners

• Advanced Field Solutions Ltd

• Advanced IT Innovations

• Advanced Manufacturing Control Systems Ltd (AMCS)

• Advanced Network Solutions (ANS)

• Advanced Technology Products

• Aerospace Software Developments Limited

• AFR

• Aircraft Management Technologies

• airG

• Alexander Mann Solutions (AMS)

• All Ireland Institute for Hospice and Palliative C

• Allegis Group

• Allen Recruitment

• Allianz Worldwide Care

• Allied World Assurance Company

• Amazon Services Europe

• Amazon Web Services (AWS)

• Ambient Displays Ltd t/a RetailCP

• AMCS

• Amdocs

• Amicus Search & Recruitment

• Amigo Media Ltd

• Ampersand Executive