SIAO

SIAO is a leading accounting and finance firm in Ikoyi and Victoria Island, Lagos, serving ambitious businesses, investors, and institutions that require dependable financial insight in a fast-evolving market. From its office at 18b Olu Holloway Road (Former Temple Road, Off Kingsway Road, Ikoyi, Lagos), SIAO supports clients across Nigeria who need clarity around risk, compliance, growth, and performance in a complex regulatory and economic landscape.

With over two decades of experience and a professional staff strength of more than 250 specialists, SIAO has become a trusted partner to organisations in engineering, oil and gas, finance, public sector, telecommunications, and manufacturing. The firm blends deep local knowledge with international best practices, helping clients navigate Nigeria’s dynamic business environment with structured, data-backed advice. Whether you are scaling a growing company, managing a large corporate portfolio, or overseeing public sector finances, SIAO provides the specialist support needed to make informed decisions.

SIAO primarily serves corporate clients, investors, and institutions that demand rigorous audit, tax, and advisory services. The team understands that each client has unique goals and challenges, so they focus on tailored solutions rather than one-size-fits-all templates. From complex deal structures to everyday compliance, SIAO’s role is to make difficult financial processes simpler, clearer, and more manageable for decision-makers across Lagos State and beyond.

Specialties

As a full-service accounting and finance firm in Lagos, SIAO offers a comprehensive portfolio that spans audit and assurance, tax advisory, financial advisory, risk, and consulting. Its audit and assurance services are designed to give stakeholders confidence in financial reporting, strengthen internal controls, and provide a solid foundation for strategic decisions. Through structured audit methodologies and sector-specific understanding, SIAO helps clients improve transparency and meet regulatory expectations.

Beyond core audit, SIAO’s financial advisory and business development services cover strategic planning, financial modelling, valuation, project evaluation, and business engineering. These services are particularly valuable for organisations planning expansion, restructuring, capital raising, or mergers and acquisitions. SIAO’s financial risk and advisory services help businesses identify, measure, and manage financial risk, ensuring that growth is supported by robust risk frameworks and sound governance.

The firm also offers specialised tax advisory and compliance, human resource consulting, and legal and compliance services. Clients rely on SIAO for tax structuring, regulatory compliance, and ongoing tax management, reducing exposure to penalties and inefficiencies. Through human resource consulting, SIAO supports organisations in building capable, motivated teams that align with broader business strategy. Its legal and compliance solutions add another layer of protection, helping clients address regulatory requirements and maintain sound corporate governance. Underpinning all of this is a thoughtful approach to Environmental, Social, and Governance (ESG) considerations and a structured consulting practice that connects financial performance with sustainability and long-term value.

Why Choose SIAO

• Over 20 years of experience serving diverse sectors in Nigeria’s economy, from oil and gas to public sector and telecommunications
• Broad, integrated service offering that covers audit, tax, advisory, risk, HR consulting, ESG, and legal and compliance under one roof
• Large multidisciplinary team of more than 250 professionals, providing depth, continuity, and specialist expertise across accounting and finance
• Tailored, research-driven solutions built on detailed analysis, financial modelling, and a clear understanding of each client’s unique context
• Strong understanding of the Nigerian market, regulation, and business environment, particularly within Lagos, Ikoyi, and Victoria Island
• Client-focused approach that simplifies complex financial and compliance challenges, making them easier for leadership teams to act on with confidence

Location & Accessibility

SIAO operates from 18b Olu Holloway Road (Former Temple Road, Off Kingsway Road, Ikoyi, Lagos), a strategic location that connects easily to both Ikoyi and Victoria Island, two of Lagos’s key business districts. The office sits within a recognised commercial corridor, with nearby corporate offices and financial institutions that make it convenient for clients already conducting business in the area. Landmarks such as major oil and gas companies and financial firms are within reach, and the location is accessible by road from central Lagos and surrounding neighbourhoods, offering a professional environment suited to high-level business engagements.

Get in Touch

Organisations seeking a reliable accounting and finance partner in Ikoyi or Victoria Island, Lagos can connect with SIAO to discuss their audit, tax, advisory, or risk management needs. To learn more about the firm’s services or to schedule a consultation, visit [http://siao.ng/](http://siao.ng/) and reach out to the team for tailored support.