The Group, which was established 17 years ago, employed 56 members of staff at its headquarters in Thurmaston, Leicester, 48 of which have been made redundant with immediate effect.
KPMG Restructuring has been called in to handle the administration.
"The business has been suffering due to the decline in spending in the corporate entertainment sector," said joint administrator and KPMG partner Richard Philpott. "Unfortunately it cannot continue to trade in its current format and we will now be exploring options for the company."
THA also has offices in France and Germany. The Group's sister company Quorn Business Travel continues to trade.
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