Within Nigeria’s largest listed and privately held companies, the company secretary functions as the institutional memory of the organization.
Their role has evolved beyond documentation and minute-taking.
Today, they serve as strategic advisers to boards, ensuring that decisions are not only profitable but defensible, ethical, and aligned with regulatory expectations.
Behind every major resolution, merger, compliance filing, or board transition lies a trail of meticulous coordination led by these individuals.
The company secretaries of the top ten listed companies by market capitalisation operate at the core of institutions that collectively account for N86.95 trillion in market capitalisation.
That figure is not just a measure of corporate size, it is a reflection of the weight they carry daily. Every decision they guide, every process they validate all tie directly to companies that move markets and shape investor confidence.
Reaching this level requires more than technical expertise. As Nigerian companies expand across borders and attract global investors, governance standards are under sharper scrutiny. This shift is elevating the role of the company secretary from a support function to a central pillar of corporate leadership.
Here are the company secretaries of Nigeria’s largest firms, by market CAP in Q1 2026.
- Market CAP: N3.93 trillion
Michael Osilama Otu is the Company Secretary/Legal Adviser of Zenith Bank Plc. The bank recorded a market capitalisation of N3.93 trillion as of Q1 2026.
Otu joined Zenith Bank on July 14, 1997 and became the Company Secretary/Legal Adviser in February, 2002.
He graduated with a Second Class Honours (Upper Division) in Law in 1992 from Ambrose Alli University (then Bendel State University) and attended the Nigerian Law School, Lagos, between 1992 and 1993, where he was called to the Nigerian Bar in 1993. He later obtained an LL.M from University of Lagos in 1996.
During his academic and law school years, he received several awards, including Best Graduating Student in Banking, Insurance and Negotiable Instruments, as well as multiple prizes in legal drafting and conveyancing.
He began his professional career in 1993 as a Legal Officer at Crystal Bank of Africa Limited (now UBA Plc). He also served as General Counsel and Deputy Head of Chambers at Vincent Omegba & Co.
He is a member of the Nigerian Bar Association, Nigerian Society of International Law, and the International Bar Association. He is also a Senior Honourary Member of the Chartered Institute of Bankers of Nigeria and a Fellow of the Chartered Institute of Arbitrators, and serves as a resource person for the Financial Institutions Training Centre and the Chartered Institute of Bankers of Nigeria.
