- 7Eleven Consultancy Services
- A 24/7 Online Food Delivery Services Company
- A.G Leventis Nigeria Limited
- Abakaliki (AEFUTHA)
- Abodes Lagos
- Absa Group
- Abuja Electricity Distribution Company (AEDC Plc)
- Accion International
- ACDI/VOCA
- Achieving Health Nigeria Initiative (AHNi)
- ACI Worldwide
- Acronis International GmbH
- Acumen West Africa
- Ad Dynamo International
- Adeeva Capital Limited
- Adkan Construction Company Limited
- Adventus.io
- Afconrecruit Limited
- Africa Law Practice (ALP)
- African Union (AU)
- Africhange (AF) Technologies Limited
- Afrilearn International Limited
- AG Vision Construction Nigerian Limited
- Agbeyewa Farms
- Agrolyfe