SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Eta Space logo Eta Space Develops cryogenic propellant management systems for in-space storage, transfer, and refueling, and liquid hydrogen infrastructure for terrestrial energy applications vs Relativity Space Manufactures reusable medium-to-heavy-lift launch vehicles using large-scale metal 3D printing and autonomous robotics Relativity Space logo
HEAD-TO-HEAD1 shared sector
Eta Space Relativity Space
Founded 2019 2015
Headquarters Rockledge, Florida Long Beach, California
Type private private
Status operating operating
Employees 10 1,285
Total funding $27.2M $1.4B
Latest round Grant Series F
Sectors Space Transportation & Logistics, Lunar Services, Space Propulsion Launch Services, Space Propulsion
Products listed 6 4
Federal contracts
Launches 3 (0%)
Leaders listed Dr. William Notardonato Eric Schmidt, Maria Seferian, Kevin Wu
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Eta Space and Relativity Space compare?

Both companies work in Space Propulsion. Eta Space was founded in 2019 and Relativity Space in 2015.

Which is larger, Eta Space or Relativity Space?

Relativity Space reports the larger workforce, with 1,285 employees versus 10.

Which has more launches, Eta Space or Relativity Space?

Relativity Space leads with 3 tracked launches (0% success rate).

Numbers refresh on every render against the live Space Index database. Federal contract data from USAspending.gov; launches from LaunchLibrary2.