Exos Aerospace FAA-licensed reusable suborbital launch operator for payload testing, research, and orbital vehicle development Portal Space Systems Manufactures solar-thermal-propelled spacecraft buses for high-delta-v, multi-orbit maneuverability and tactically responsive space operations 
| Exos Aerospace | Portal Space Systems | |
|---|---|---|
| Founded | 2014 | 2021 |
| Headquarters | Greenville, Texas | Bothell, Washington |
| Type | private | private |
| Status | operating | operating |
| Employees | — | 22 |
| Total funding | $7M | $20M |
| Latest round | Series A | Seed |
| Sectors | Launch Services, Space Propulsion, Suborbital & High-Altitude | Space Transportation & Logistics, Satellite Manufacturing, Space Propulsion |
| Products listed | 7 | 3 |
| Federal contracts | — | — |
| Launches | — | — |
| Leaders listed | David Mitchell, John Quinn, Neil Milburn | Jeff Thornburg, Ian Vorbach, Prashaanth Ravindran |
| News mentions | 0 | 26 |
How do Exos Aerospace and Portal Space Systems compare?
Both companies work in Space Propulsion. Exos Aerospace was founded in 2014 and Portal Space Systems in 2021.