Carlyle, an investment firm, is purchasing ManTech International Corp., a provider of security technologies, in a transaction with a value of $4.2 billion.

ManTech provides mission-focused technology services for U.S. defense, intelligence and federal civilian agencies.

“ManTech’s talented employees and leadership team have built a remarkable Company with strong market positions across the federal government,” said Dayne Baird, a managing director on Carlyle’s Aerospace & Government Services team. “Through this partnership, we look forward to leveraging our sector expertise and resources to accelerate growth and innovation and to drive greater value for customers.”

Goldman Sachs & Co. LLC is serving as exclusive financial advisor and King & Spalding LLP is serving as legal counsel to ManTech. Robert W. Baird & Co. is serving as financial advisor and Latham & Watkins LLP is serving as legal advisor to Carlyle.