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 Volta Space Technologies Develops wireless optical power transmission systems for lunar surface operations, delivering energy from orbit via laser beaming satellites Volta Space Technologies logo
HEAD-TO-HEAD1 shared sector
Phase Four Volta Space Technologies
Founded 2015 2020
Headquarters Hawthorne, California, USA Montréal, Quebec, Canada
Type private private
Status closed operating
Employees 5 15
Total funding $35.8M
Latest round Series C Seed
Sectors Space Propulsion, Satellite Components & Subsystems Lunar Services, Satellite Components & Subsystems
Products listed 4 2
Federal contracts
Launches
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern Justin Zipkin, Paolo Pino, PhD, Paul Damphousse
News mentions 0 9
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and Volta Space Technologies compare?

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

Which is larger, Phase Four or Volta Space Technologies?

Volta Space Technologies reports the larger workforce, with 15 employees versus 5.

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