SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Momentus logo Momentus Operates orbital service vehicles and manufactures satellite buses for in-space transportation, hosted payloads, and proximity operations vs Portal Space Systems Manufactures solar-thermal-propelled spacecraft buses for high-delta-v, multi-orbit maneuverability and tactically responsive space operations Portal Space Systems logo
HEAD-TO-HEAD2 shared sectors
Momentus Portal Space Systems
Founded 2017 2021
Headquarters San Jose, California Bothell, Washington
Type public private
Status operating operating
Employees 41 22
Total funding $20M
Latest round Seed
Sectors Space Transportation & Logistics, In-Orbit Servicing & Assembly, Satellite Manufacturing Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion
Products listed 3 3
Federal contracts
Launches
Leaders listed John C. Rood, Rob Schwarz, Lon Ensler Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Momentus and Portal Space Systems compare?

Both companies work in Space Transportation & Logistics, Satellite Manufacturing. Momentus was founded in 2017 and Portal Space Systems in 2021.

Which is larger, Momentus or Portal Space Systems?

Momentus reports the larger workforce, with 41 employees versus 22.

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