SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.03
Epsilon3 logo Epsilon3 Provides AI-powered procedure execution and resource management software for complex engineering, manufacturing, testing, and 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
Epsilon3 Sierra Space
Founded 2021 2021
Headquarters Los Angeles, California, USA Louisville, Colorado, USA
Type private private
Status operating operating
Employees 29 1,072
Total funding $18.8M $2.2B
Latest round Series A Series C
Sectors Space Software & Mission Tools, Satellite Manufacturing Satellite Manufacturing, Space Propulsion, Space Stations & Habitats
Products listed 6 7
Federal contracts 1 ($6.5M)
Launches
Leaders listed Laura Crabtree, Max Mednik, Audrey Fraijo Dan Jablonsky, Janet Kavandi, Troy Lahr
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Epsilon3 and Sierra Space compare?

Both companies work in Satellite Manufacturing. Epsilon3 was founded in 2021 and Sierra Space in 2021.

Which is larger, Epsilon3 or Sierra Space?

Sierra Space reports the larger workforce, with 1,072 employees versus 29.

Which has more US federal contracts, Epsilon3 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.