Northrop Grumman Corporation, a leading global security company, and Orbital ATK, Inc., a global leader in aerospace and defense technologies, said Monday they have entered into a definitive agreement under which Northrop Grumman will acquire Orbital ATK for approximately $7.8 billion in cash, plus the assumption of $1.4 billion in net debt.

Upon completion of the acquisition, Northrop Grumman plans to establish Orbital ATK as a new, fourth business sector to ensure a strong focus on operating performance and a smooth transition into Northrop Grumman, the company said in a statement.

“The acquisition of Orbital ATK is an exciting strategic step as we continue to invest for profitable growth. Through our combination, customers will benefit from expanded capabilities, accelerated innovation and greater competition in critical global security domains,” said Wes Bush, chairman, chief executive officer and president of Northrop Grumman.

Orbital ATK is a global leader in aerospace and defense technologies.  The company designs, builds and delivers space, defense and aviation systems for customers around the world, both as a prime contractor and merchant supplier.  Its main products include launch vehicles and related propulsion systems; missile products, subsystems and defense electronics; precision weapons, armament systems and ammunition; satellites and associated space components and services; and advanced aerospace structures.

The transaction is expected to close in the first half of 2018 and is subject to customary closing conditions, including regulatory and Orbital ATK shareholder approval.