The audit market is firmly in the spotlight, with a series of apparent auditing failures leading to increasingly loud questioning of the dominance of the Big Four. Regulatory measures such as mandatory audit firm rotation (MAFR) have undoubtedly made the market more competitive between the Big Four but have done little to break their dominance. Across the eight major markets that Source Global Research analysed in its latest study of the market, the Big Four still have a 94% market share.