What is Phase Four?
Founded in 2015, Phase Four has established itself as a disruptive force in the space industry. The company's core innovation, the radio-frequency thruster (RFT), represents a fundamental shift in satellite propulsion architecture. By prioritizing miniaturized power electronics and high-performance capabilities, Phase Four addresses the critical bottlenecks faced by small satellite operators. The successful flight heritage of the Maxwell turn-key propulsion system in 2021 served as a pivotal milestone, validating the company's technical roadmap and its ability to deliver reliable, flight-ready hardware to a competitive global market.
How much funding has Phase Four raised?
Phase Four has raised a total of $33M across 4 funding rounds:
Debt
$350K
Debt
$359K
Series B
$26M
Other Financing Round
$6.3M
Debt (2020): $350K with participation from PPP
Debt (2021): $359K led by PPP
Series B (2021): $26M supported by New Science Ventures
Other Financing Round (2024): $6.3M featuring Leonid
Key Investors in Phase Four
Leonid
Leonid Capital Partners is a private equity firm focused on middle-market businesses, providing growth capital and strategic investments to drive long-term value creation.
New Science Ventures
New Science Ventures is a venture capital firm that invests in early and late-stage companies utilizing novel scientific approaches in life sciences and information technology.
PPP
Public-Private Partnership
What's next for Phase Four?
Looking ahead, the strategic deployment of this recent capital will likely focus on scaling production capacity to support the growing backlog of satellite constellation projects. As the industry shifts toward more frequent, high-density launches, Phase Four's ability to provide scalable, efficient propulsion will be a key differentiator. The company is expected to leverage this financial runway to further refine its RFT architecture, potentially exploring new propellant configurations and enhancing the integration capabilities of its Maxwell system. By maintaining its focus on performance and cost-efficiency, Phase Four is poised to remain a critical supplier in the evolving landscape of orbital logistics and space infrastructure.
See full Phase Four company page