MediaCom has acquired Brilliant Media, along with its business and assets with immediate effect.
The MediaCom Regional network will be further strengthened by the addition of the Manchester, Leeds, and Birmingham operations of Brilliant Media.
"The sale to MediaCom guarantees that Brilliant's loyal customer base will continue to receive a high level of personalised service across all three offices. Additionally, it will now have the benefit of being part of the wider MediaCom network," a WPP statement said.
Brilliant Media, led by managing director Chris Broadbent, launched in September 1999 as a result of the merger of Media Lane and DMS.