SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Epsilon3 logo Epsilon3 Provides AI-powered procedure execution and resource management software for complex engineering, manufacturing, testing, and operations vs Portal Space Systems Manufactures solar-thermal-propelled spacecraft buses for high-delta-v, multi-orbit maneuverability and tactically responsive space operations Portal Space Systems logo
HEAD-TO-HEAD1 shared sector
Epsilon3 Portal Space Systems
Founded 2021 2021
Headquarters Los Angeles, California Bothell, Washington
Type private private
Status operating operating
Employees 29 22
Total funding $18.8M $20M
Latest round Series A Seed
Sectors Space Software & Mission Tools, Satellite Manufacturing Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion
Products listed 6 3
Federal contracts
Launches
Leaders listed Laura Crabtree, Max Mednik, Audrey Fraijo Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Epsilon3 and Portal Space Systems compare?

Both companies work in Satellite Manufacturing. Epsilon3 was founded in 2021 and Portal Space Systems in 2021.

Which is larger, Epsilon3 or Portal Space Systems?

Epsilon3 reports the larger workforce, with 29 employees versus 22.

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