The Big Four firm gained six new clients in the three months to August across the total stock market, with 406 contracts, according to Adviser Rankings' Q3 guide in association with Crowe Clark Whitehill.
PwC remained in second place with 369 total clients, while Deloitte stayed third despite losing four of its 255 clients. BDO retained 5th position with 199 clients, after a gain of one.
While PwC came in second overall the firm held a higher number of clients than KPMG in the FTSE 350 market, small caps and in the consumer goods and health care sectors.
In the FTSE 350 space Deloitte, EY and BDO held a total of 251, 234 and 199 clients respectively.
According to Adviser Rankings, PwC had 72 FTSE 250 clients and 35 clients within the FTSE 100 group.
KPMG came in second in both tables, with 70 FTSE 250 clients and 27 FTSE 100 companies. Deloitte and EY came in third and forth place.
While Grant Thornton audits three FTSE 250 companies, the mid-tier firm did not secure any FTSE 100 clients. BDO was the only non-Big Four firm to a secure blue chip contract.
The report noted that, despite the introduction of the mandatory audit rotation in June, “there is little evidence to suggest that blue chips are hiring outside the Big Four at this stage”.
In the small cap group, PwC held its number one spot with 98 clients, followed by KPMG, EY, Deloitte and Grant Thornton.
Meanwhile, KPMG remained most popular auditor in the AIM market with 152 clients and BDO held second position with 142.
Grant Thornton, PwC and Deloitte rounded out the top five for AIM, with 130, 107 and 68 clients each. EY, the remaining Big Four firm, came in 7th with 56 AIM clients.
The financial sector provided another big win for KPMG, where it held 145 clients. By comparison, PwC had 133 clients in financial service, followed by EY with 110 and Deloitte with 84. Grant Thornton also retained its top position within technology clients.