Grant Thornton UK retains its position as the
auditor with most AIM clients despite impressive gains from rival
BDO in the past year, according to the Morningstar Professional
Services Rankings Guide.

The latest rankings show a worrying trend of
firms losing an average of 15 clients in the past four years.

In the past quarter, Grant Thornton lost three
clients and has 175 overall, ahead of second placed BDO which
gained 24 clients to 144.

Crowe Clark Whitehill, placed ninth on the
list, has had the largest gain over four years with 29 new clients.
The firm has grown its AIM client base for the past six

PwC leads the AIM 100 with 21 clients, while
PwC and Deloitte audit the most AIM 50 clients with 11 each.