Orbital ATK’s Board of Directors Declares $0.26 Per Share Quarterly Dividend and Increases Authorized Amount of Share Repurchase Program

Orbital ATK, Inc. (NYSE: OA), a global leader in aerospace and defense technologies, today announced that its Board of Directors has declared a quarterly cash dividend of $0.26 per share. The dividend will be payable September 24, 2015 to stockholders of record as of September 2, 2015.

Orbital ATK’s Board also authorized an increase in the aggregate amount of common stock that may be purchased under the company’s stock repurchase program for calendar year 2015, from the previously announced level of the lesser of $75 million or 1 million shares to the lesser of $100 million or 1.4 million shares. As previously announced, shares of common stock may be purchased from time to time in the open market, subject to compliance with applicable laws and regulations and the company’s debt covenants and other agreements, depending upon market conditions and other factors.

“I am very pleased our Board approved management’s recommendation to expand the 2015 share repurchase program,” said David W. Thompson, Orbital ATK’s President and Chief Executive Officer. “Our Board is very supportive of a balanced capital allocation plan that includes dividends, share repurchases and required debt repayment, together with investments in research and development and capital equipment to propel future revenue growth and increased profitability.”

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 more than 12,000 people in 18 states across the U.S. and in several international locations. For more information, visit www.orbitalatk.com.