Enterprise said the agency switch was preceded by a review that had involved four media agencies, including the incumbent. The company did not wish the reveal the other participants.
"We worked with MediaVest for a decade and overall benefited from their knowledge. As our company has grown our needs have changed," a spokeswoman for Enterprise said. She declined to elaborate on what the new needs were.
PHD was not immediately available for comment, and MediaVest referred calls to the marketer.
Enterprise spent $35.7 million on measured media in 2002, according to TNS Media Intelligence/CMR.