ATK and Orbital Sciences on Monday completed their $5 billion all-stock merger clearing the way for the aerospace and defense company to begin operations on Tuesday as Orbital ATK [OA].

Orbital ATK Chief David Thompson. Photo: Orbital ATK
Orbital ATK Chief David Thompson. Photo: Orbital ATK

Immediately before the completion of the transaction, ATK spun-off its Sporting Group business into a newly formed company named Vista Outdoor Inc. [VSTO], which like Orbital ATK begins trading on the New York Stock Exchange on Tuesday.

Orbital ATK will be led by David Thompson, who is Orbital’s current chairman and CEO.