Based in El Segundo, California, Phase Four is enabling the exponential growth of satellite constellations by solving the satellite’s costliest problem, the propulsion system. The company’s electrodeless RF thruster is the smallest plasma propulsion system available today, and can be scaled for use from CubeSat to SmallSat to school bus-sized satellites. By eliminating the most common failure points in incumbent technologies – electrodes, high-voltage electronics, and complex fabrication – Phase Four has built a system that is reliable and offers high-performance with baked-in manufacturability. Designed with tomorrow’s satellites and constellations in mind, the P4 RF thruster brings SmallSats the same performance levels of large satellites, in a simpler form factor. Visit us at:


We are: Phase Four, P4, PHASE FOUR

We are not: Phase4, PhaseFour, PHASEFOUR, pf, P4ASE FOUR


Consistent use of the Phase Four logo is essential in creating a united brand identity.  The master logo is supplied as artwork and should never be altered, distorted or re-created in any way.

For all permitted uses of the Phase Four brand mark, you may NOT:

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  • Use or mix colors that are not part of the brand color
  • Recreate the font in another typeface
  • Tilt, twist, stretch or bend the logo
  • Use tints of the approved logo colors