SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Epsilon3 logo Epsilon3 Provides AI-powered procedure execution and resource management software for complex engineering, manufacturing, testing, and operations vs Momentus Operates orbital service vehicles and manufactures satellite buses for in-space transportation, hosted payloads, and proximity operations Momentus logo
HEAD-TO-HEAD1 shared sector
Epsilon3 Momentus
Founded 2021 2017
Headquarters Los Angeles, California San Jose, California
Type private public
Status operating operating
Employees 29 41
Total funding $18.8M
Latest round Series A
Sectors Space Software & Mission Tools, Satellite Manufacturing Space Transportation & Logistics, In-Orbit Servicing & Assembly, Satellite Manufacturing
Products listed 6 3
Federal contracts
Launches
Leaders listed Laura Crabtree, Max Mednik, Audrey Fraijo John C. Rood, Rob Schwarz, Lon Ensler
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Epsilon3 and Momentus compare?

Both companies work in Satellite Manufacturing. Epsilon3 was founded in 2021 and Momentus in 2017.

Which is larger, Epsilon3 or Momentus?

Momentus reports the larger workforce, with 41 employees versus 29.

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