Northrop Grumman partners with Apex on space-based interceptors for Golden Dome

WASHINGTON — Northrop Grumman has partnered with satellite manufacturing startup Apex to develop space-based interceptors for the Golden Dome missile defense program.

The companies announced the partnership June 1. Northrop Grumman is one of 12 firms selected by the U.S. Space Force to develop concepts for space-based interceptors, one of the most ambitious elements of the Trump administration’s Golden Dome missile defense initiative. These are weapons that would operate in orbit and engage adversary missiles during flight. 

Golden Dome is a proposed layered missile defense architecture intended to defend the United States against ballistic, cruise and hypersonic missile threats.

Los Angeles-based Apex manufactures standardized satellite buses designed to be produced more quickly and at lower cost than traditional government spacecraft. 

The announcement follows a series of industry pairings emerging across the space-based interceptor program. Raytheon has disclosed a partnership with Rocket Lab, while Anduril Industries has assembled a team that includes several commercial space companies. The arrangements reflect a deliberate effort by the Pentagon to encourage collaboration between established defense contractors and newer entrants to the space sector.

The partnerships seek to address a question repeatedly raised by Gen. Michael Guetlein, the Pentagon official overseeing Golden Dome: whether space-based interceptors can be built affordably and in sufficient quantities to support a large-scale homeland defense architecture.

“Manufacturing readiness empowers rapid development and deployment of next-gen space-based missile defense,” Northrop Grumman said in a statement. The company described Apex as one of its industry collaborators and has not identified other partners.

“We’re combining our advanced missile defense technologies and commercial partnerships to demonstrate next generation space-based interceptor capabilities in support of our nation’s Golden Dome priorities,” said Ryan Tintner, vice president and general manager of Northrop Grumman’s space superiority systems division.

Tintner said the company has completed key ground tests this year and is on track to demonstrate an on-orbit capability in 2027. He added that the partnership with Apex is intended to help accelerate development and support affordable production at larger scale.

Apex co-founder and chief executive Ian Cinnamon said the collaboration is intended to support what he described as “operational, constellation-scale space-based missile defense” and enable the companies to respond quickly to emerging government requirements.

The Space Force is pursuing the interceptor effort through Other Transaction Authority agreements, a contracting approach designed to encourage competition and rapid prototyping. Companies selected for the program are expected to also invest their own capital during early development, with the prospect of larger follow-on awards if technologies prove viable.

Whether commercial approaches can substantially change the economics of space-based missile defense remains a central question for the program. Recent estimates from the Congressional Budget Office concluded that space-based interceptors would likely be the most expensive element of a Golden Dome architecture, potentially accounting for hundreds of billions of dollars in costs over the life of the program.