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A4S is an independent audit, advisory, assurance and assessment firm. We turn ISO standards into governance that holds up — under audit, under regulation, and under pressure

A4S – Audit, Advisory, Assurance and Assessment Services Limited – is a Nigerian-based professional services firm with over 15 years of experience supporting more than 500 clients across various industries.

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  • +234 911 238 8137
    +233-24-472-0138
  • [email protected]
  • 2 Bamishile Street, Off Allen Avenue, Ikeja, Lagos.
  • C789/3 Mango Tree Avenue, Asylum Down, Accra, Ghana 0272733.

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