X0306 4 2015-02-09 0 0000866121 ORBITAL ATK, INC. OA 0001045854 WEBSTER SCOTT L C/O ORBITAL ATK, INC. 45101 WARP DRIVE DULLES VA 20166 1 0 0 0 Common Stock 2015-02-09 4 A 0 943 A 943 D Common Stock 2015-02-09 4 A 0 18280 A 18280 I By Trust Non-Employee Director Stock Option (right to buy) 28.91 2015-02-09 4 A 0 2245 A 2007-01-03 2016-01-03 Common Stock 2245 2245 D Acquired pursuant to the Transaction Agreement among Alliant Techsystems, Inc. (renamed Orbital ATK, Inc.) ("Orbital ATK"), Vista Merger Sub Inc., Vista Outdoor Inc. (formerly known as Vista SpinCo Inc.) and Orbital Sciences Corporation ("Orbital") (the "Transaction Agreement"), pursuant to which each share of Orbital common stock was converted into 0.449 shares of Orbital ATK common stock and cash payable in lieu of fraction shares of Orbital ATK common stock. The market value of Orbital ATK common stock is $63.94 per share based on the opening price per share of Orbital ATK common stock on the first day of trading following the Merger (as defined in the Transaction Agreement). Pursuant to the Transaction Agreement, each outstanding Orbital option was converted into an option to purchase a number of shares of Orbital ATK common stock equal to the product of 0.449 multiplied by the number of shares of Orbital common stock that would have been acquired upon the exercise of such option prior to the effective time of the merger, with an exercise price equal to the exercise price for each share of Orbital common stock prior to the effective time divided by 0.449. /s/ James S. Black II, Attorney-in-Fact 2015-02-11