Bond's contract with Harry Nash does not expire until August, but it is believed he has been offered a substantial signing bonus to join Morton Jankel Zander.
Julia Reed, the managing director of Harry Nash, said: "It's really upsetting when you build a director and somebody offers them a better deal financially. It's about money - I'm very familiar with how the US system works."
Bond has won a raft of industry awards in the three years he has been at Harry Nash, and his most high-profile UK work includes commercials for Skoda, the Adidas "Lomu
spot, Nike and Kiss 100.
Reed continues to act as an executive producer to Bond's feature career.
She claimed: "Both Rocky (Morton) and David (Zander) have been actively after all our directors for the past year."
Last month, the US directors Spike Jonze, Dante Ariola, Tom Kuntz and Mike Maguire signed to MJZ from Propaganda/Satellite Films - which subsequently changed its name to Independent Films - for representation in the UK.
MJZ was not available to comment as Campaign went to press.