Lockheed Martin
Lockheed Martin is an undisputed big dog of the space stocks, they have a massive aerospace business and a space technology division.
Terran Orbital
Terran Orbital develops space tech from CubeSats, to small satellites, and is a developer and operator of ground stations.
AirBus
Airbus, a European aerospace company with a large space division. Their share price is steady, and they pay a dividend.