IML, which was acquired by Computershare in 2005, has more than 1,000 global clients and provides technology tools enabling audience interaction through conversation, texting, voting and content sharing.
The company then captures and analyses data generated through this interaction, providing insight for clients at events.
Richard Taylor, chief executive of Lumi Mobile, who was the former head of IML for four years until 2011, said: "This is a unique opportunity to bring together two exceptional technology companies with patented processes that complement each other enormously.
"This acquisition underlines the versatility of Lumi’s mobile solutions and creates an integrated technology business defined by global scale, market penetration and high-quality client service across our key sectors of market research and live meetings and events."
As part of the move, Taylor will remain as chief executive for the enlarged group.
Earlier this year, Lumi Mobile expanded into the meetings and events market with the launch of Join In, a communications app based on the company’s patented, real-time Lumi Live platform.
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