Who Owns Northrop Grumman Space Systems?

The sector's lineage combines three distinct space legacies. TRW, acquired by Northrop in 2002 for approximately $7.8 billion, built satellites and rocket propulsion dating to the earliest U.S. space programs. Orbital Sciences, part of the Orbital ATK combination acquired in 2018, pioneered small launch vehicles and commercial satellites and developed the Cygnus spacecraft under NASA's Commercial Orbital Transportation Services program. Northrop's own space business had built the Apollo-era tracking and classified payloads for decades.

Cygnus first flew to the ISS in 2013 under Orbital Sciences and has continued flying resupply missions under Northrop ownership, launched on rockets including Antares, Atlas V, Falcon 9, and now the larger Cygnus XL variant that debuted in 2025. The spacecraft is one of NASA's two commercial cargo vehicles alongside SpaceX's Dragon.

In September 2020 the Air Force awarded Northrop the Engineering and Manufacturing Development contract for the Ground Based Strategic Deterrent, renamed Sentinel, worth an initial $13.3 billion. The program to replace the Minuteman III ICBM is the sector's largest undertaking and one of the biggest weapons programs in the Pentagon portfolio.

Sentinel ran into trouble. In July 2024 the program exceeded its cost baseline enough to trigger a critical Nunn-McCurdy breach, driven mainly by the command-and-launch infrastructure of silos and cables across five states. The Pentagon certified the program's continuation and restructured it in 2025, with Northrop retained as prime contractor at significantly higher projected cost.

Elsewhere, the sector won Space Development Agency contracts for the Proliferated Warfighter Space Architecture, including an approximately $764 million award in December 2025 for Tranche 3 Tracking Layer satellites. Its solid rocket motor business produces the GEM 63XL boosters flown on United Launch Alliance's Vulcan rocket.