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 Skyroot Aerospace Develops small-lift launch vehicles for the small satellite market using solid-fuel boosters, 3D-printed liquid engines, and cryogenic propulsion Skyroot Aerospace logo
HEAD-TO-HEAD1 shared sector
Phase Four Skyroot Aerospace
Founded 2015 2018
Headquarters Hawthorne, California, USA Hyderabad, Telangana, India
Type private private
Status closed operating
Employees 5 500
Total funding $35.8M $99.8M
Latest round Series C Series B
Sectors Space Propulsion, Satellite Components & Subsystems Launch Services, Space Propulsion
Products listed 4 3
Federal contracts
Launches 1 (0%)
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern Pawan Kumar Chandana, Naga Bharath Daka, Kishore Tallam
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and Skyroot Aerospace compare?

Both companies work in Space Propulsion. Phase Four was founded in 2015 and Skyroot Aerospace in 2018.

Which is larger, Phase Four or Skyroot Aerospace?

Skyroot Aerospace reports the larger workforce, with 500 employees versus 5.

Which has more launches, Phase Four or Skyroot Aerospace?

Skyroot Aerospace leads with 1 tracked launches (0% success rate).

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