SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.03
Phase Four logo Phase Four Developed electrodeless radio-frequency and multi-mode electric propulsion systems for satellites vs UARX Space Provides in-space logistics, orbital transfer vehicles, and satellite deployment systems for small satellites from LEO to the Moon UARX Space logo
HEAD-TO-HEAD1 shared sector
Phase Four UARX Space
Founded 2015 2020
Headquarters Hawthorne, California, USA Rúa do Labrego, 4, Building 1A, 36350 - Nigrán, Pontevedra, Spain
Type private private
Status closed operating
Employees 5 14
Total funding $35.8M
Latest round Series C
Sectors Space Propulsion, Satellite Components & Subsystems Space Transportation & Logistics, Lunar Services, Satellite Components & Subsystems
Products listed 4 10
Federal contracts
Launches
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern Yanina Hallak, Andrés Villa Granata, Juan Pablo Franco
News mentions 0 37
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and UARX Space compare?

Both companies work in Satellite Components & Subsystems. Phase Four was founded in 2015 and UARX Space in 2020.

Which is larger, Phase Four or UARX Space?

UARX Space reports the larger workforce, with 14 employees versus 5.

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