- Amazon
- Animal / Poultry Feed Manufacturing Company
- AOS Orwell Limited
- APIN Public Health Initiatives
- Apple Nigeria
- Aquada Development Corporation
- Aritoria Consulting
- Arkers Finance Company Limited
- ARM Pension Managers (PFA) Limited
- Arnergy Solar Limited
- ART X Collective
- Ascentech Services Limited
- Asseco Software Nigeria
- Asset & Resource Management Holding Company
- Astract9 Designs Limited
- atmosfair
- Aureole Consulting Limited
- Autochek Africa
- Avant Garde by Soul Chow
- Avant Halogen
- Aza Finance
- Baba-Ahmed University
- Babban Gona
- Backable Media
- Baker Hughes