Carlyle to Buy US Defense Contractor ManTech for $3.9 Billion

A general view of the lobby outside the Carlyle Group offices in Wash., on May 3, 2012. Jonathan Ernst/Reuters

ManTech International Corp on Monday agreed to a $3.93 billion all-cash deal with Carlyle Group Inc as the private equity firm strengthens its portfolio of U.S. defense contractors.

Carlyle has offered $96 per ManTech share held, representing a 17% premium to the stock’s closing on Friday. The company’s shares were up about 15% in early trading in a weak broader market.