SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
Apex logo Apex Designs and mass-manufactures standardized satellite bus platforms for commercial and government constellation deployments across LEO, MEO, and GEO orbits vs Phase Four Developed electrodeless radio-frequency and multi-mode electric propulsion systems for satellites Phase Four logo
HEAD-TO-HEAD1 shared sector
Apex Phase Four
Founded 2022 2015
Headquarters Los Angeles, California Hawthorne, California
Type private private
Status operating closed
Employees 234 5
Total funding $522M $35.8M
Latest round Series D Series C
Sectors Satellite Manufacturing, Satellite Components & Subsystems Space Propulsion, Satellite Components & Subsystems
Products listed 3 4
Federal contracts 1 ($22.0M)
Launches
Leaders listed Ian Cinnamon, Max Benassi, Adam Corey Steve Kiser, M. Umair Siddiqui, Simon Halpern
News mentions 0 0
SHARED SECTORS
FREQUENTLY ASKED

How do Apex and Phase Four compare?

Both companies work in Satellite Components & Subsystems. Apex was founded in 2022 and Phase Four in 2015.

Which is larger, Apex or Phase Four?

Apex reports the larger workforce, with 234 employees versus 5.

Which has more US federal contracts, Apex or Phase Four?

Apex has been awarded more, with $22.0M across 1 awards.

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