Top ten firm BDO has improved its lead in the Adviser Rankings again this quarter after it gained one more client.

BDO has continued its leading streak in auditing more Alternative Investment Market (AIM) companies than any other firm.

The firm’s recent addition means its total AIM clients now number 145.

Big Four firm KPMG currently holds the number two spot as it increased its total number of AIM clients by nine in this quarter to make 139.

AIM was established in 1995 for growing businesses who want the benefit of public quotation as well as a flexible regulatory approach. Since then it has become the most successful growth market of its type in the world.

BDO also leads other categories including basic materials clients, oil and gas clients, and consumer services clients, where it has now stormed ahead of KPMG, with whom it used to share the lead.

BDO also overtook KPMG for industrial clients and now sits in second behind Grant Thornton.

KPMG continues to lead the financial clients category, as well as dominating the FTSE AIM 100, the stock market index of the top 100 companies on the London Stock Exchange’s Alternative Investment Market.

BDO ranked sixth in this table while Grant Thornton, which was previously tied with other Big Four firm Deloitte, gained two clients in the last quarter to take third place outright.

The ranking differed considerably when it came to the FTSE AIM UK 50, with PwC up at the top with 13 clients and Deloitte second with eight. BDO is tied fourth with EY and Grant Thornton.

Grant Thornton came third overall for AIM clients and first for technology clients. Even though it lost a client during this quarter, now having 27 in total, it still has eight more than second place firm KPMG, and over double the number of BDO, which lies in third with 13.

When it came to health care clients, BDO made progress once again. The firm’s additional client propelled it into joint fourth place with Deloitte, while PwC remained first and KPMG second.

Outside of the top six accounting firms, Mazars improved in the Total AIM Clients table to be joint twelfth and joint tenth for customer services clients. Whitely Penn entered the rankings for FTSE AIM 100 Clients in joint ninth place and Crowe improved in financial clients to be ranked tenth.

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