Our Profile

SIAO is a merger of four Firms. The combined Firms are Smith Sule and Associates, Ighodalo & Associates, OA Financial Consulting Limited and Robert Ade Odiachi & Co.

The name of the Firm was coined out of the first letter of the surnames of each of the founding Partners. S-Smith, I-Ighodalo, A-Adewale (a retired partner), O-Odiachi.

It is an independent Nigerian professional services firm which boasts a crop of seasoned professionals with local and international experience positioned to providing excellent financial advisory services and business assurance. Specifically, the Firm is managed by Alumni of KPMG, PWC, EY, PKF Professional Services and Grant Thornton.

With a professional staff strength of over 100 highly qualified and dedicated personnel, we pride ourselves as being Nigeria’s largest indigenous professional services firm.

Our professional competence has seen us audited and consulted for various sectors of the economy such as Engineering, Oil and Gas, Finance, Public Sector, Telecommunications and Manufacturing amongst others.

We pride ourselves in always being at a high level of responsiveness and commitment to our client’s needs. This distinguishes us from our competitors and also guarantees excellent results for repeat business.

Our Vision

The vision of SIAO is to be the Go-to professional services firm in the whole of Africa.

Our Mission

Our mission is to provide our clients with flawless services and consistently be a reliable source of financial advisory.

Our Core Values

  • Innovative
  • Consistency
  • Client Focused
  • Reliability
  • Bespoke Solutions

Helping businesses just like yours

For expert guidance and know-how you can trust SIAO
Browse SIAO

SIAO is an independent Nigerian professional services firm, providing Audit & Assurance, Accounting, Tax, International Financial Reporting Standards Advisory, Human Resource, and Financial Advisory Services.


BOI House,
Plot 256, Zone A
Off Herbert Macaulay Way
Behind Unity Bank Building
Central Business District

Tel: +23492912462,
Tel: +23492912463


18b Olu Holloway Road,
(Former Temple Road),
Off Kingsway Road,

Tel- +234(802)1810043