COMPANY INFO
The actual company name is Phase Four, Inc. It was founded in 2015 by J. Sheehan and Simon Halpern. The company has approximately 44 employees as of 2025. The official website is https://phasefour.io. Phase Four operates in the Aerospace and Defense industry, specializing in space technology and manufacturing. The company develops satellite propulsion systems designed to economically advance space missions, focusing on small, low-mass plasma propulsion systems with a patented magnetic nozzle to direct thrust. Their technology enables clients to reduce costs and maneuver satellites into various orbits including elliptical, geostationary, and polar orbits. The company is headquartered in Hawthorne, California, USA.
Phase Four was founded in 2015 and operates in the Aerospace and Defense industry. Headquartered in Hawthorne, California, the company specializes in developing advanced satellite propulsion systems designed to make space missions more economical and agile. With a team of around 44 employees, Phase Four introduces innovative technology in the form of low-mass plasma propulsion systems featuring a patented magnetic nozzle, enabling clients to maneuver satellites into a variety of orbits, including elliptical, geostationary, and polar. Their solutions support both commercial and defense sectors in reducing costs and enhancing satellite operations.
Since inception, Phase Four has adopted a progressive funding strategy tailored to fuel consistent growth and technological advancement. To date, Phase Four funding amounts to a total of $43.6 million raised over six funding rounds. The company has passed several key milestones, advancing from initial seed investments supporting R&D, to multi-million dollar venture capital rounds aimed at scaling operations and deepening strategic partnerships. Key Phase Four investors span both prominent venture capital firms and industry-focused funds, positioning the company at the forefront of space propulsion innovation.
The Series C round was led by Artemis Group Capital and raised $12.9 million. The funds are designated for scaling manufacturing capacity, accelerating research and development, and strengthening strategic partnerships to meet growing demand in the commercial and defense aerospace sectors.
In the Series B round, Phase Four secured $26 million to support its market expansion efforts and further grow its international presence, enabling increased production and commercial deployment of its propulsion systems.
The Series A round brought in $17.57 million, focused on advancing product development and expanding the company’s technical and operational teams to accelerate market entry.
This later-stage seed round raised $9.3 million to support the early-stage development of core propulsion technologies crucial for the company’s first commercial solutions.
Phase Four’s initial seed round totaled $1.1 million and was used to launch operations and lay the groundwork for technology prototyping and validation.
A prominent venture capital firm with experience in backing aerospace innovation, Artemis Group Capital served as the lead investor in Phase Four’s Series C round. Their involvement brings significant industry expertise and access to strategic networks.
Autochrome is known for investing in advanced, high-growth technology startups. As a Phase Four investor, Autochrome contributes to the company’s expansion through both capital and industry insights.
With an emphasis on supporting early-stage deep tech ventures, Syndicate 708 participated in Phase Four funding rounds, reinforcing the company’s R&D and market outreach goals.
AFWERX, a U.S. Air Force innovation arm, provides funding and strategic partnership opportunities. Their investment in Phase Four aligns with national interests in space and defense technology.
LightSpeed Innovations is a venture capital group focused on aerospace startups, playing a critical role as a Phase Four investor, especially in the early development phases.
Leonidas Capital Partners is a venture capital fund with a strong portfolio in defense and dual-use technology companies. Their investment supports Phase Four’s growth trajectory.
Specializing in space and aerospace, Hyperspace Ventures brings not just funding but strategic advice as a Phase Four investor, accelerating technological and market milestones.
Known for its focus on science-driven companies, New Science Ventures is a significant contributor to the Phase Four investment journey, providing capital for innovative product development.
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