SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.03
Portal Space Systems logo Portal Space Systems Manufactures solar-thermal-propelled spacecraft buses for high-delta-v, multi-orbit maneuverability and tactically responsive space operations. 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
Portal Space Systems Zeno Power
Founded 2021 2018
Headquarters Bothell, Washington, USA Washington, District of Columbia, USA
Type private private
Status operating operating
Employees 22 79
Total funding $20M+ 94870000
Latest round Seed Series B
Sectors Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion Satellite Components & Subsystems, Lunar Services, Space Propulsion
Products listed 3 2
Federal contracts
Launches
Leaders listed Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran Tyler Bernstein, Jonathan Segal, Jacob Matthews
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Portal Space Systems and Zeno Power compare?

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

Which is larger, Portal Space Systems or Zeno Power?

Zeno Power reports the larger workforce, with 79 employees versus 22.

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