Across the board, the group worked for 1,148 clients last year, compared to 1,207 in 2000.
A statement from Chime said: 'Despite a much-chronicled weakness in the PR market, this has not been our experience.'
Major acquisitions for Chime last year included US-based technology agency LNS Communications.
It also acquired German PR business MMK in October, launched Smithfield Financial in Frankfurt and in December acquired corporate social responsibility specialist agency The Smart Company.
The company statement added that the group saw CSR as a growth area.