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Portal Space Systems competitors & alternatives
The 12 closest competitors and alternatives to Portal Space Systems among aerospace companies — ranked by similarity to what Portal Space Systems actually does, not by market-cap band.
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About Portal Space Systems
Portal Space Systems Inc. is headquartered in Bothell, Washington, and develops spacecraft propulsion and mobility technologies. Its flagship spacecraft, Supernova, is designed to enable rapid space maneuverability and high delta-v capabilities.
Portal Space Systems at a glance
Portal Space Systems is an aerospace company headquartered in United States. It has raised at least $79M across the 2 funding rounds on record. Its most recent funding round, Series A, raised $61.5M in March 2026. Xcout tracks 13 named people at Portal Space Systems, including Jeff Thornburg (CEO and CTO). Xcout recorded 39 job postings from Portal Space Systems in the last 90 days, naming tools such as Datadog, Fortinet, Grafana.
Portal Space Systems leadership
- Jeff ThornburgCEO and CTO
- Jeffery ThornburgChief Executive Officer
- Ian VorbachPresident and CRO
- Jeff ThornburgCEO and founder
- Kimberly PetittExecutive Assistant to the CEO
- Mark BittermanVP of Government Affairs
7 more named people on record for Portal Space Systems, with roles, board committees and tenure — see the full roster →
Portal Space Systems funding rounds
At least $79M raised across the 2 rounds on record. Every round on record:
| Date | Round | Amount | Investors |
|---|---|---|---|
| Series A | $61.5M | 7 named | |
| Series A | $17.5M | 6 named |
Who invested in each round, lead investors, valuations and the co-investor graph — open the full funding history →
Hiring at Portal Space Systems
Xcout recorded 39 job postings from Portal Space Systems in the last 90 days, from a hiring record Xcout has kept since August 2026.
Tools named in Portal Space Systems's job postings
The weekly hiring trend, the roles and locations behind it — see Portal Space Systems's hiring signals →
Top 12 Portal Space Systems competitors
Ranked by semantic similarity — how close each company is to Portal Space Systems by what it does, using Xcout's live company graph. Click any company for its full profile, or its competitor set.
Aerospace & Defense
Radian Aerospace Inc. is an aerospace technology company headquartered in Bellevue, Washington, developing advanced reusable spaceplane technology.
Similar aerospace company
Gravitics is a defense and space manufacturing company headquartered in Seattle, Washington. The firm specializes in developing commercial space station modules, cargo and logistics carriers, and orbital infrastructure using a modular 4-meter diameter form factor.
Similar aerospace company
Constellation Space Corp is a company headquartered in Seattle, Washington, that builds ConstellationOS. This operating system is designed as an AI operating system for mega-scale satellite networks.
Similar aerospace company
Momentus Inc. is an American commercial space company headquartered in San Jose, California, that designs and manufactures in-space infrastructure, offering transportation and related in-space services.
Aerospace & Satellite Services
Katalyst Space Technologies develops robotic spacecraft and dynamic space operations solutions for satellite servicing and orbital management. Its flagship product, Nexus, provides capabilities such as orbital maneuvering, docking, robotic servicing, and on-orbit hardware upgrades for government and commercial space operators.
Similar aerospace company
GATE Space builds high-thrust chemical propulsion systems and mobility solutions powered by patented rocket engines and green propellants. Their products enable satellites, capsules, and landing vehicles to perform rapid maneuvers and precise orbit and attitude control.
Similar aerospace company
Revolution Space is an aerospace company based in Boston (Charlestown), Massachusetts, that develops advanced space systems for the 21st century.
Similar aerospace company
Outpost Space, also known as Outpost Technologies Corporation, is a defense and space manufacturing company headquartered in Los Angeles that builds fully-reusable orbital shipping containers for through-space delivery anywhere on Earth.
Similar aerospace company
Millennium Space Systems designs and manufactures high-performing small satellite systems and constellations for defense and commercial customers. The company provides agile, autonomous spacecraft and mission solutions across low, medium, geosynchronous, very-low Earth, and cis-lunar orbits for applications including missile warning, tactical intelligence, surveillance, reconnaissance, and communications.
Aerospace, Space Technology
Exotrail provides end-to-end space mobility solutions, including electric propulsion systems and in-orbit services for satellite operators. The company helps manage satellite positioning, collision avoidance, and end-of-life deorbiting to support secure and sustainable space operations.
Similar aerospace company
Arkadia Space is a Spanish aerospace company developing propulsion systems for satellites and spacecraft, including thrusters and propulsion subsystems based on more sustainable or “green” propellants. It serves satellite manufacturers and space missions requiring compact in-space propulsion solutions.
Similar aerospace company
Sophia Space, Inc. is an orbital space computing company headquartered in Pasadena, California, and a portfolio company of Mandala Space Ventures. The company develops advanced in-space computing technologies and power systems, collaborating with research institutions like Caltech.
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