The deal could be completed as soon as Thursday following clearance by the EU competition authority late last week (July 13).
It follows similar approval by regulators in Russia and the US.
Hogg Robinson, valued at around £400 million, specialises in B2B travel management services.
“The combined group is expected to offer clients and travellers a wider range of products and services, bringing together the best of both businesses including technology, people and a comprehensive geographic footprint,” said GBT in a statement.
David Radcliffe, Hogg Robinson Group chief executive, will join the GBT board following its acquisition of the TMC.
