SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
CesiumAstro logo CesiumAstro Designs, manufactures, and integrates software-defined phased array communications systems, payloads, and satellites for space, airborne, and ground platforms vs Epsilon3 Provides AI-powered procedure execution and resource management software for complex engineering, manufacturing, testing, and operations Epsilon3 logo
HEAD-TO-HEAD1 shared sector
CesiumAstro Epsilon3
Founded 2017 2021
Headquarters Austin, Texas Los Angeles, California
Type private private
Status operating operating
Employees 318 29
Total funding $710.2M $18.8M
Latest round Series C Series A
Sectors Satellite Components & Subsystems, Satellite Communications, Satellite Manufacturing Space Software & Mission Tools, Satellite Manufacturing
Products listed 15 6
Federal contracts
Launches
Leaders listed Shey Sabripour, Kenneth Smith, Chris Pappas III Laura Crabtree, Max Mednik, Audrey Fraijo
News mentions 26 0
SHARED SECTORS
FREQUENTLY ASKED

How do CesiumAstro and Epsilon3 compare?

Both companies work in Satellite Manufacturing. CesiumAstro was founded in 2017 and Epsilon3 in 2021.

Which is larger, CesiumAstro or Epsilon3?

CesiumAstro reports the larger workforce, with 318 employees versus 29.

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