SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Phase Four logo Phase Four Developed electrodeless radio-frequency and multi-mode electric propulsion systems for satellites vs Ursa Major Technologies Designs and manufactures liquid rocket engines, solid rocket motors, and hypersonic propulsion systems for commercial launch and U.S. defense applications Ursa Major Technologies logo
HEAD-TO-HEAD2 shared sectors
Phase Four Ursa Major Technologies
Founded 2015 2015
Headquarters Hawthorne, California Colorado
Type private private
Status closed operating
Employees 5 291
Total funding $35.8M $549.4M
Latest round Series C Debt
Sectors Space Propulsion, Satellite Components & Subsystems Space Propulsion, Satellite Components & Subsystems, Space Defense Systems
Products listed 4 6
Federal contracts
Launches
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern Chris Spagnoletti, Bill Nash, Justin Siebert
News mentions 0 18
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and Ursa Major Technologies compare?

Both companies work in Space Propulsion, Satellite Components & Subsystems. Phase Four was founded in 2015 and Ursa Major Technologies in 2015.

Which is larger, Phase Four or Ursa Major Technologies?

Ursa Major Technologies reports the larger workforce, with 291 employees versus 5.

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