Orbital ATK to Report Fourth Quarter 2017 Financial Results on February 22

Orbital ATK, Inc. (NYSE: OA), a global leader in aerospace and defense technologies, today announced that it will issue a press release at approximately 6:00 a.m. (EST) on February 22, 2018 to report its fourth quarter 2017 financial results. Due to the announced acquisition of Orbital ATK by Northrop Grumman, the company will not conduct a conference call to discuss the quarterly results.

About Orbital ATK

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. Headquartered in Dulles, Virginia, Orbital ATK employs approximately 13,000 people across the U.S. and in several international locations. For more information, visit www.orbitalatk.com.