Despite the successes, Powell pointed out that PwC is the country’s biggest auditor of FTSE 100 blue-chip companies, so it would be “naïve” to think it wasn’t “likely to lose some” big-name clients. KPMG, Deloitte and EY are second, third and fourth in a small gaggle of auditors that has a stranglehold on the market, which has prompted the regulator’s intervention.