PwC and EY Tie for Top Spot in Nigeria Audit Market
PwC and EY have tied for the top position in Nigeria's corporate audit market, underscoring the enduring dominance of the Big Four in a sector where global reach remains the deciding factor for major companies.
PricewaterhouseCoopers and Ernst & Young each audited 23 of Nigeria's 128 largest listed and unlisted companies in 2025, capturing a 17.97% market share apiece. The dead heat for first place leaves the two firms jointly commanding nearly 36% of the reviewed market.
The broader audit landscape remains firmly in the grip of the Big Four. Deloitte & Touche secured the third position with 17 companies, down from 18 the prior year, while KPMG Professional Services followed with 13, a drop from 15 in 2024. Together, these four global networks audited 76 of the 128 firms analyzed, accounting for 59.38% of the total market share.
The leaders are winning on both volume and the prestige of their mandates. PwC’s portfolio includes Dangote Sugar Refinery, Stanbic IBTC Holdings and Seplat Energy. EY audits Guaranty Trust Holding Company, MTN Nigeria and Nestlé Nigeria. These client lists span banking, telecommunications, energy and consumer goods, demonstrating that Nigeria's largest corporates overwhelmingly favor global networks for statutory audits.
Despite this high concentration, the top tier is not static. Minor client migrations heavily influence the annual rankings because the leading firms are separated by only a handful of engagements. Eterna Plc shifted from Deloitte to PwC, while Nigerian Breweries moved from Deloitte to KPMG. Sterling Bank switched from EY to Deloitte, illustrating how a single mandate can alter the competitive balance among closely matched rivals.
Outside the dominant quartet, PKF Professional Services leads the mid-tier with 10 engagements, representing 7.81% of the sample. Baker Tilly Nigeria and BDO Professional Services each hold five audits, including BDO's mandate for Oando Plc. However, fifteen smaller audit practices held just one engagement each, highlighting a highly fragmented lower market.
For investors and market professionals, the 2025 data confirms that auditor selection in Nigeria is driven by global reputation and sector capacity rather than cost. The significant gap between the Big Four and mid-tier competitors suggests that smaller firms will struggle to break into the upper echelons of corporate reporting without expanding their operational scale.
