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.
ARK Space Exploration & Innovation ETF
ARK Space Exploration & Innovation ETF is probably a Top Space Fund thanks to the ARK brand but is more aerospace than space
RocketLab
Rocket Lab Inc. as a space investment has many large backers; space funds and tech investors large and small.
Virgin Galactic
Virgin Galactic is one of the few space tourism stocks that has survived years of development. Space Planes are a long time coming!
Intuitive Machines
An investment in Intuitive Machines gives you space exploration coverage, and is focussed on the Moon and CisLunar missons.