SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Antaris logo Antaris Provides a cloud-based software platform for satellite mission design, digital twin simulation, flight software, and constellation operations vs CesiumAstro Designs, manufactures, and integrates software-defined phased array communications systems, payloads, and satellites for space, airborne, and ground platforms CesiumAstro logo
HEAD-TO-HEAD1 shared sector
Antaris CesiumAstro
Founded 2021 2017
Headquarters Los Altos, California Austin, Texas
Type private private
Status operating operating
Employees 21 318
Total funding $7.7M $710.2M
Latest round Seed Series C
Sectors Space Software & Mission Tools, Satellite Manufacturing Satellite Components & Subsystems, Satellite Communications, Satellite Manufacturing
Products listed 4 15
Federal contracts
Launches
Leaders listed Tom Barton, Karthik Govindhasamy, John Trionfo Shey Sabripour, Kenneth Smith, Chris Pappas III
News mentions 0 26
SHARED SECTORS
FREQUENTLY ASKED

How do Antaris and CesiumAstro compare?

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

Which is larger, Antaris or CesiumAstro?

CesiumAstro reports the larger workforce, with 318 employees versus 21.

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