Ibadan · Lagos · Abuja Est. 17.09.1956
The second indigenous accountancy firm in Nigeria.
Founded on 17th September, 1956 by Dr Z. O. Ososanya, and grown over time into one of the leading firms in the Country. A member firm of HLB International.
Founded byDr Z. O. Ososanya
17 September 1956Date of establishment
70thYear of practice — founded 17 September 1956
3Offices — Ibadan, Lagos and Abuja
2ndindigenous accountancy firm in Nigeria
150+Countries across the HLB International network
What we do
What We Offer
Audit & Assurance
Independent audit and assurance that gives boards, regulators and investors confidence in the numbers.
See moreTax Consultancy
Corporate and personal tax handled across Nigerian and cross-border obligations, backed by the HLB International network.
See moreBusiness Advisory
Practical advice that improves how a business runs — from governance and structure to process, people and risk.
See moreFinancial Consulting
Corporate finance support for the moments that matter — transactions, valuations and strategic decisions.
See morePayroll & HR Services
Payroll run accurately and compliantly, so the firm's clients can focus on their own business.
See moreTechnology & Digital Solutions
Technology advisory that helps clients modernise while keeping their data and systems secure.
See moreLeadership
Our team
Babatunde J. Kolawole
Managing Partner
MScFCAFCTICRISCCISACDPSEACIS
Simon O. Awotoye
Partner
HNDFCACFEFCTI
Olufemi A. Ososanya
Consultant
BScFCAFCTICFACFECISACRISCCDPSECEH
News & Insights
The latest from the firm
31 July 2026
What membership of HLB International means for our clients
A Nigerian practice with reach into more than 150 countries — what the HLB International network is, and why it matters on a cross-border engagement.
26 July 2026
The firm's leaders, 1956 to today
Six leaderships across two eras of the practice, from Dr Z. O. Ososanya to the present Managing Partner — and the meaning behind OSEATA House.
17 July 2026
Seventy years of HLB Z. O. Ososanya & Co.
On 17th September, 2026 the Firm completes seventy years of practice. A short note on where it began, and what has carried it here.
HLB International
A member firm of HLB International.
As a member of HLB International, a prestigious global network of professional accounting firms and business advisers, we leverage international expertise to seamlessly handle cross-border engagements. With over 2,195 partners and 25,000 professionals in more than 700 offices across 150+ countries, our network ensures that our clients benefit from world-class financial solutions and specialised industry insights.
Our HLB profile2,195Partners
25,000Professionals
700+Offices
150+Countries