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 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
CesiumAstro Portal Space Systems
Founded 2017 2021
Headquarters Austin, Texas Bothell, Washington
Type private private
Status operating operating
Employees 318 22
Total funding $710.2M $20M
Latest round Series C Seed
Sectors Satellite Components & Subsystems, Satellite Communications, Satellite Manufacturing Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion
Products listed 15 3
Federal contracts
Launches
Leaders listed Shey Sabripour, Kenneth Smith, Chris Pappas III Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran
News mentions 26 0
SHARED SECTORS
FREQUENTLY ASKED

How do CesiumAstro and Portal Space Systems compare?

Both companies work in Satellite Manufacturing. CesiumAstro was founded in 2017 and Portal Space Systems in 2021.

Which is larger, CesiumAstro or Portal Space Systems?

CesiumAstro reports the larger workforce, with 318 employees versus 22.

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