The acquisition, expected to close by the fourth quarter, will add 20-30 new clients to Tech Mahindra, Chief Executive Officer C P Gurnani said.
He also said all of Lightbridge's 5,700 employees would join Tech Mahindra, taking the company's total headcount to about 100,000.
"We expect network services to be a major growth engine for our organisation," Executive Vice Chairman Vineet Nayyar said in a statement. As of now, the telecommunications business accounts for around 45 percent of the company's revenue.
Tech Mahindra did not say how much its revenue will be boosted by the deal.