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 Space Forge Manufactures advanced semiconductor materials and alloys in microgravity using reusable, returnable satellite platforms for return to Earth Space Forge logo
HEAD-TO-HEAD1 shared sector
Phase Four Space Forge
Founded 2015 2018
Headquarters Hawthorne, California, USA Florida
Type private private
Status closed operating
Employees 5 64
Total funding $35.8M $51.2M
Latest round Series C Series A
Sectors Space Propulsion, Satellite Components & Subsystems In-Space Manufacturing, Satellite Components & Subsystems, Satellite Manufacturing
Products listed 4 4
Federal contracts
Launches
Leaders listed Steve Kiser, M. Umair Siddiqui, Simon Halpern Joshua Western, Andrew Bacon, Michelle Flemming
News mentions 0 43
SHARED SECTORS
FREQUENTLY ASKED

How do Phase Four and Space Forge compare?

Both companies work in Satellite Components & Subsystems. Phase Four was founded in 2015 and Space Forge in 2018.

Which is larger, Phase Four or Space Forge?

Space Forge reports the larger workforce, with 64 employees versus 5.

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