SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.03
Muon Space logo Muon Space Designs, builds, and operates mission-tailored LEO satellite constellations for Earth observation, climate monitoring, and national security applications. 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
Muon Space Sierra Space
Founded 2021 2021
Headquarters Mountain View, California, USA Louisville, Colorado, USA
Type private private
Status operating operating
Employees 197 1,072
Total funding 260.7M $2.2B
Latest round Series B Series C
Sectors Earth Observation & Remote Sensing, Geospatial Intelligence & Analytics, Satellite Manufacturing Satellite Manufacturing, Space Propulsion, Space Stations & Habitats
Products listed 6 7
Federal contracts 1 ($6.5M)
Launches
Leaders listed Jonny Dyer, Gregory Smirin, Pascal Stang Dan Jablonsky, Janet Kavandi, Troy Lahr
News mentions 2 0
SHARED SECTORS
FREQUENTLY ASKED

How do Muon Space and Sierra Space compare?

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

Which is larger, Muon Space or Sierra Space?

Sierra Space reports the larger workforce, with 1,072 employees versus 197.

Which has more US federal contracts, Muon Space 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.