| Phase Four | Sierra Space | |
|---|---|---|
| Founded | 2015 | 2021 |
| Headquarters | Hawthorne, California | Louisville, Colorado |
| Type | private | private |
| Status | closed | operating |
| Employees | 5 | 1,072 |
| Total funding | $35.8M | $2.2B |
| Latest round | Series C | Series C |
| Sectors | Space Propulsion, Satellite Components & Subsystems | Satellite Manufacturing, Space Propulsion, Space Stations & Habitats |
| Products listed | 4 | 7 |
| Federal contracts | — | 1 ($6.5M) |
| Launches | — | — |
| Leaders listed | Steve Kiser, M. Umair Siddiqui, Simon Halpern | Dan Jablonsky, Janet Kavandi, Troy Lahr |
| News mentions | 0 | 0 |
How do Phase Four and Sierra Space compare?
Both companies work in Space Propulsion. Phase Four was founded in 2015 and Sierra Space in 2021.
Which is larger, Phase Four or Sierra Space?
Sierra Space reports the larger workforce, with 1,072 employees versus 5.
Which has more US federal contracts, Phase Four or Sierra Space?
Sierra Space has been awarded more, with $6.5M across 1 awards.