Orbital Sciences Dulles, Va. Headquarters Building. Photo: Orbital Sciences

[Via Satellite 02-10-2015] Orbital Sciences and the aerospace and defense groups of Alliant Techsystems (ATK) have completed the merger between the two companies. This forms a new $4.5-billion space, defense and aviation systems manufacturer for which the new company will begin trading shares immediately.

“Now, with our two organizations coming together under the Orbital ATK banner, we begin operations with substantially greater technical and industrial capabilities and increased financial resources,” said Orbital ATK President and CEO David W. Thompson.

Headquartered in Dulles, Va., Orbital ATK will serve customers in the United States government, commercial, and international markets in three operating groups: the Flight Systems Group, the Defense Systems Group and the Space Systems Group.