SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.03
CesiumAstro logo CesiumAstro Designs, manufactures, and integrates software-defined phased array communications systems, payloads, and satellites for space, airborne, and ground platforms. vs Sierra Space Designs and manufactures satellite platforms, reusable spaceplanes, expandable habitats, and propulsion systems for national security and civil space Sierra Space logo
HEAD-TO-HEAD1 shared sector
CesiumAstro Sierra Space
Founded 2017 2021
Headquarters Austin, Texas, USA Louisville, Colorado, USA
Type private private
Status operating operating
Employees 318 1,072
Total funding $710.2M $2.2B
Latest round Series C Series C
Sectors Satellite Components & Subsystems, Satellite Communications, Satellite Manufacturing Satellite Manufacturing, Space Propulsion, Space Stations & Habitats
Products listed 15 7
Federal contracts 1 ($6.5M)
Launches
Leaders listed Shey Sabripour, Kenneth Smith, Chris Pappas III Dan Jablonsky, Janet Kavandi, Troy Lahr
News mentions 26 0
SHARED SECTORS
FREQUENTLY ASKED

How do CesiumAstro and Sierra Space compare?

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

Which is larger, CesiumAstro or Sierra Space?

Sierra Space reports the larger workforce, with 1,072 employees versus 318.

Which has more US federal contracts, CesiumAstro or Sierra Space?

Sierra Space has been awarded more, with $6.5M across 1 awards.

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