SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Sierra Space logo Sierra Space Designs and manufactures satellite platforms, reusable spaceplanes, expandable habitats, and propulsion systems for national security and civil space vs Zeno Power Develops radioisotope power systems that convert heat from decaying isotopes into years of reliable electricity for lunar surface and seabed missions Zeno Power logo
HEAD-TO-HEAD1 shared sector
Sierra Space Zeno Power
Founded 2021 2018
Headquarters Louisville, Colorado Washington, District of Columbia
Type private private
Status operating operating
Employees 1,072 79
Total funding $2.2B $94.9M
Latest round Series C Series B
Sectors Satellite Manufacturing, Space Propulsion, Space Stations & Habitats Satellite Components & Subsystems, Lunar Services, Space Propulsion
Products listed 7 2
Federal contracts 1 ($6.5M)
Launches
Leaders listed Dan Jablonsky, Janet Kavandi, Troy Lahr Tyler Bernstein, Jonathan Segal, Jacob Matthews
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Sierra Space and Zeno Power compare?

Both companies work in Space Propulsion. Sierra Space was founded in 2021 and Zeno Power in 2018.

Which is larger, Sierra Space or Zeno Power?

Sierra Space reports the larger workforce, with 1,072 employees versus 79.

Which has more US federal contracts, Sierra Space or Zeno Power?

Sierra Space has been awarded more, with $6.5M across 1 awards.

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