The buyout sees the merged agency move to a North London base and a shrunken staff count of 15, with the rest believed to have been made redundant.
Probe Media has retained all of its clients which include Heart 106.2FM, Konami, EMI and Warner Music.
"The acquisition of Probe Media means that its clients will benefit from access to greater resources and services," said Nick Gillette, managing director, Tangent Labs.