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 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
Antaris Sierra Space
Founded 2021 2021
Headquarters Los Altos, California Louisville, Colorado
Type private private
Status operating operating
Employees 21 1,072
Total funding $7.7M $2.2B
Latest round Seed Series C
Sectors Space Software & Mission Tools, Satellite Manufacturing Satellite Manufacturing, Space Propulsion, Space Stations & Habitats
Products listed 4 7
Federal contracts 1 ($6.5M)
Launches
Leaders listed Tom Barton, Karthik Govindhasamy, John Trionfo Dan Jablonsky, Janet Kavandi, Troy Lahr
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Antaris and Sierra Space compare?

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

Which is larger, Antaris or Sierra Space?

Sierra Space reports the larger workforce, with 1,072 employees versus 21.

Which has more US federal contracts, Antaris 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.