United Launch Alliance (ULA)

www.ulalaunch.com

A joint venture between Boeing and Lockheed Martin, ULA provides launch services for government and commercial payloads, focusing on heavy-lift rockets like Atlas V and Vulcan Centaur.

Blue Origin

www.blueorigin.com

Founded by Jeff Bezos, Blue Origin develops reusable rockets and spacecraft, including New Glenn, aiming to compete directly with SpaceX in orbital and deep space missions.

Rocket Lab

www.rocketlabusa.com

A US-New Zealand company specializing in small and medium-lift launch vehicles, notably the Electron and upcoming Neutron rockets, targeting both commercial and government markets.

Firefly Aerospace

www.fireflyspace.com

Texas-based Firefly develops launch vehicles like Alpha for small and medium payloads, with contracts from NASA and the US Space Force.

Relativity Space

www.relativityspace.com

A US startup using 3D printing to manufacture rockets such as Terran 1 and Terran R, aiming for rapid, cost-effective launch services.

Stoke Space

www.stokespace.com

A US company developing fully reusable rockets, including the Nova vehicle, with a focus on rapid turnaround and cost reduction.

Northrop Grumman

www.northropgrumman.com

A major US defense contractor providing launch services and spacecraft, including the Pegasus and Minotaur rockets, primarily for government missions.

Boeing

www.boeing.com

Aerospace giant involved in launch services (Delta rockets, CST-100 Starliner) and space infrastructure, often through partnerships like ULA.

Lockheed Martin

www.lockheedmartin.com

A leading US aerospace and defense company, co-owner of ULA, with a history in launch vehicles and space systems.

Sierra Space

www.sierraspace.com

A US company focused on spaceplanes (Dream Chaser) and orbital infrastructure, competing in space logistics and crew/cargo transport.