- Agrolyfe
- Aideplanet Limited
- AIM Consultants Limited
- Aina Blankson
- Airtel Nigeria
- Alan & Grant
- Alex Ekwueme Federal University Teaching Hospital
- Alex Reid West Africa
- All Energy West Africa (AEWA) Nigeria Limited
- Allan & Ogunkeye Legal Practitioners
- Alltimes Water Technology
- Almondsprings School
- AltSchool Africa
- Amaiden Energy Nigeria Limited
- Amazon
- Amazon Web Services (AWS)
- American Cancer Hospital
- Anakle
- AnneMarthas Global Services Limited
- AOS Orwell Limited
- APIN Public Health Initiatives
- Apple Nigeria
- ARM Pension Managers (PFA) Limited
- Arnergy Solar Limited
- Asseco Software Nigeria