Hermeus Secures $350 Million to Develop World’s Fastest Unmanned Aircraft
Hermeus Secures $350 Million in Series C Funding
Hermeus, an Atlanta-based defense aviation company focused on developing high-Mach unmanned aircraft, has successfully closed a $350 million Series C funding round, bringing its total valuation to $1 billion. The announcement was made today, with Khosla Ventures leading the investment. This funding increases Hermeus’ total capital raised to over $500 million.
The Series C round consists of $200 million in equity and $150 million in debt. Existing investors, including Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, and In-Q-Tel, participated in this round, alongside new investors such as Cox Enterprises, Destiny Tech100, Georgia Tech Foundation, 137 Ventures, and GSBackers. Debt financing was provided by Silicon Valley Bank, Pinegrove Venture Partners, Hercules Capital, and Trinity Capital.
Aircraft Development and Future Goals
Hermeus is advancing its production plans with a fleet of three distinct aircraft, each designed to explore the supersonic and hypersonic flight envelope. The Quarterhorse Mk 2.1, which completed its first flight in February 2026 at Spaceport America, is powered by a Pratt & Whitney F100 engine equipped with Hermeus’ proprietary precooler. It received its FAA Special Airworthiness Certificate on March 12. The next variant, the Mk 2.2, is anticipated to become the fastest unmanned aircraft globally, followed by the Mk 3, which will utilize Hermeus’ Chimera turbine-based combined-cycle engine.
The long-term objective is to exceed the Lockheed SR-71 Blackbird’s air-breathing speed record of Mach 3.32, established in 1976, with aspirations to eventually reach Mach 5. This capability aligns with the Department of Defense’s interests, which have been supported through various contracts, including the Defense Innovation Unit’s HyCAT initiative and a $60 million deal with the Air Force in 2021.
Operational Expansion and Strategic Focus
To accommodate the new funding, Hermeus is establishing a new headquarters in El Segundo, California, aimed at enhancing its prototyping capabilities. The existing facility in Atlanta will concentrate on production. This dual-site strategy is similar to approaches taken by other defense technology startups transitioning from prototype to operational delivery.
Hermeus refers to the “Department of War” in its communications, reflecting its mission focus. Beyond the Quarterhorse, the company aims to develop Darkhorse, a reusable hypersonic unmanned aerial system (UAS) intended for intelligence, surveillance, and reconnaissance (ISR) missions in contested airspace.
Trends in Defense Technology Funding
Hermeus’ valuation of $1 billion places it within a competitive landscape of venture-backed defense companies seeking funding from the Pentagon. Notable examples include Anduril, which is reportedly raising $4 billion at a valuation of $60 billion, and Chaos Industries, which raised $510 million in November 2025 at a valuation of $4.5 billion for its counter-drone radar systems. Neros Technologies has also gained attention, securing $121 million and winning contracts with the Army and Marine Corps for FPV drones.
What distinguishes Hermeus is its focus on speed. Most current U.S. Air Force unmanned programs, such as the General Atomics YFQ-42 and the Kratos XQ-58 Valkyrie, operate at subsonic speeds. Hermeus is unique in actively flight-testing an unmanned aircraft designed for supersonic and hypersonic capabilities, addressing a gap identified by the Pentagon.
In contrast, China is developing its own hypersonic drone carrier, which aims to deploy drone swarms at Mach 5, highlighting the competitive nature of high-Mach unmanned capabilities.
Conclusion
The recent funding round for Hermeus underscores a clear trend in defense technology funding, shifting from smaller autonomous systems to larger, faster platforms. The company’s progress, including the successful flight of the Quarterhorse Mk 2.1 and its plans for future variants, positions it as a key player in the development of high-Mach unmanned aircraft. The involvement of significant investors, such as In-Q-Tel and RTX Ventures, indicates strong interest in Hermeus’ potential to meet the Pentagon’s needs for advanced ISR platforms.