LOS ANGELES, — April 8, 2026 : Hermeus, a defense aviation company developing high-Mach unmanned aircraft, announced on April 7, 2026, that it has closed a $350 million Series C financing round, bringing its post-money valuation to $1 billion.The funding is intended to support the company’s transition from prototype testing to the development and production of mission-ready platforms.
The Series C round was led by Khosla Ventures and includes participation from existing investors Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, and In-Q-Tel. New investors in the round include Cox Enterprises through its venture arm Socium Ventures, Destiny Tech100, Georgia Tech Foundation, 137 Ventures, and GSBackers. In addition to equity financing, the round also includes debt participation from Silicon Valley Bank, Pinegrove Venture Partners, Hercules Capital, and Trinity Capital.
Funding Structure and Capital Deployment
The $350 million financing package consists of $200 million in equity and $150 million in structured debt, increasing the company’s total capital raised to more than $500 million since its founding in 2018. According to the company, the funds will be used to accelerate development timelines, scale manufacturing capacity, and enable simultaneous production of multiple aircraft systems.
Hermeus stated that the investment will support its shift toward operational platforms designed for national security missions, while also advancing development of high-speed unmanned aircraft systems capable of reaching supersonic and eventually hypersonic speeds.
Quarterhorse Program Progress
A key milestone in the company’s development roadmap was achieved on March 2, 2026, when Hermeus completed the first flight of its Quarterhorse Mk 2.1 test aircraft. The flight took place at Spaceport America in New Mexico, operating over White Sands Missile Range airspace, and was conducted remotely from a ground-based flight deck.
The flight validated multiple aspects of the aircraft, including system performance, handling characteristics, and operational procedures. It also marked the second successful first flight conducted by the company in less than a year.
The Quarterhorse Mk 2.1 is comparable in size to an F-16 fighter aircraft and incorporates a delta-wing configuration along with a variable inlet design. It is powered by a Pratt & Whitney F100-229 engine and represents a significant scale-up from its predecessor, being nearly three times larger and four times heavier than the Mk 1 variant.
Company officials confirmed that the Quarterhorse program is now approaching supersonic flight capability. As part of its next phase, Hermeus plans to expand to a fleet of three aircraft of similar size to support continued testing, integration of mission-specific payloads, and further progress toward sustained high-Mach operations.
Long-Term Development Goals
Hermeus’ broader development roadmap includes achieving speeds of up to Mach 3 with its current platform evolution and progressing toward ramjet-powered propulsion systems. The company is also pursuing a longer-term objective of developing a hypersonic aircraft, referred to as Darkhorse, with a target speed of Mach 5.
The company’s approach emphasizes a hardware-first development model aimed at reducing iteration cycles by building and testing physical systems in rapid succession.
Operational Expansion
To support increased production and development activities, Hermeus is expanding its operational footprint. The company is establishing a new headquarters in El Segundo, California, which will serve as a central hub for engineering and program management activities.
At the same time, its existing facility in Atlanta, Georgia, will transition toward a primary focus on production activities. The company expects more than 200 employees to be based at the El Segundo site by mid-2027.
Executive and Investor Commentary
AJ Piplica, founder and chief executive officer of Hermeus, stated that the newly secured funding will enable parallel development and manufacturing efforts.
“Speed is life for us,” Piplica said. “This new funding lets us build multiple aircraft at the same time and scale our manufacturing capabilities, adding more hardware richness and robustness to our program. That accelerates our path to ramjet-powered flight.”
He added that the company’s development model is structured to reduce timelines through iterative hardware testing. “We are grateful for the support of our long-term partners who share our vision of building fast planes fast. Together, we’re bringing scalable, asymmetric capabilities to our national security customers,” Piplica said.
Vinod Khosla, founder of Khosla Ventures, said the firm’s continued investment reflects confidence in Hermeus’ execution and trajectory.
“We’ve been believers in Hermeus from the start, and we couldn’t be happier to lead this Series C,” Khosla said. “The team is on a clear trajectory to solve a critical capability gap for their customers by building, flying, and iterating at a pace that matches the modern battlefield.”
Andrew Davis, managing partner at Socium Ventures, described the financing round as a significant milestone in the company’s development.
“We’ve had a front-row seat to watch this team execute at the pace and precision this mission demands,” Davis said. “This Series C marks an important inflection point for the company. Cox Enterprises and our venture fund, Socium Ventures, are proud to support them as they accomplish significant milestones this year.”
Strategic Outlook
Hermeus stated that the funding will be used to deliver high-speed aviation capabilities aligned with emerging defense requirements, particularly for the U.S. Department of Defense. The company’s focus remains on rapid development and deployment of advanced unmanned systems designed for high-speed, long-range missions in contested environments.
Founded in 2018, Hermeus continues to position itself within the defense sector as a developer of high-Mach and future hypersonic aircraft systems, with ongoing efforts centered on scaling production and advancing flight capabilities.
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