| Phase Four | Portal Space Systems | |
|---|---|---|
| Founded | 2015 | 2021 |
| Headquarters | Hawthorne, California | Bothell, Washington |
| Type | private | private |
| Status | closed | operating |
| Employees | 5 | 22 |
| Total funding | $35.8M | $20M |
| Latest round | Series C | Seed |
| Sectors | Space Propulsion, Satellite Components & Subsystems | Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion |
| Products listed | 4 | 3 |
| Federal contracts | — | — |
| Launches | — | — |
| Leaders listed | Steve Kiser, M. Umair Siddiqui, Simon Halpern | Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran |
| News mentions | 0 | 0 |
How do Phase Four and Portal Space Systems compare?
Both companies work in Space Propulsion. Phase Four was founded in 2015 and Portal Space Systems in 2021.
Which is larger, Phase Four or Portal Space Systems?
Portal Space Systems reports the larger workforce, with 22 employees versus 5.