Since its founding the company has expanded rapidly out of New Zealand, providing its video transfer platform to customers in Singapore, Australia, India and Indonesia.
The technology allows television advertisements to be transferred from one location to another in less than 10 minutes.
Ebus' clients include advertisers, production firms, television broadcasters, web publishers and online marketers.
Masiello, who remains chief executive of Ebus, relocated to Singapore in 2009 in order to be closer to the firm's core markets.
Chief operating officer Michael Orton is based in Auckland.
Masiello said IMD's investment would help speed up Ebus' expansion in the Asia Pacific region.
"We look forward to being supported by a shareholder that combines financial strength with an intimate understanding of what we do and who we are," he said.
IMD said the acquisition would strengthen its digital TV ad delivery service in Asia Pacific where Ebus has established "a peerless reputation as the most reliable and the fastest service in the region with the widest geographical offering".