KPMG was named Accountancy Firm of the Year at the Global Investor Awards earlier this month.
It acknowledges the company's commitment as leading financial advisers to the investment management industry.
The awards recognise the greatest contributions to asset management and asset servicing in the past 12 months.
They are classified into three broad categories - survey winners, investment excellence and editorial awards.
The award ceremony took place at a gala dinner at the Grange City Hotel, in London, on July 6.
Managing partner of KPMG Isle of Man David McGarry said: "As a firm we are very honoured to have been recognised with such a renowned award.
"The traditional and alternative investment management world is extremely competitive so to have been acknowledged as the best in our field is an incredible achievement.
"This is a tribute to KPMG's strength in focusing on building trusted relationships and delivering quality output, whatever your investment activity, and providing an exemplary service to our clients every single day."