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 Solstar Space Provides commercial Wi-Fi access points, space communicators, and persistent connectivity services for spacecraft, space stations, and lunar missions Solstar Space logo
HEAD-TO-HEAD1 shared sector
Phase Four Solstar Space
Founded 2015 2017
Headquarters Hawthorne, California, USA Santa Fe, New Mexico, USA
Type private private
Status closed operating
Employees 5 9
Total funding $35.8M $3.4M
Latest round Series C Grant
Sectors Space Propulsion, Satellite Components & Subsystems Satellite Communications, Satellite Components & Subsystems
Products listed 4 7
Federal contracts
Launches
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern M. Brian Barnett, Tony Colucci, Emmanuel Thomas
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and Solstar Space compare?

Both companies work in Satellite Components & Subsystems. Phase Four was founded in 2015 and Solstar Space in 2017.

Which is larger, Phase Four or Solstar Space?

Solstar Space reports the larger workforce, with 9 employees versus 5.

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