Hermeus

HardwareAtlanta, USAFounded 2018· One of 1818 Hardware companies tracked by AMPulse

Developing reusable Mach 5 hypersonic aircraft for defense and commercial applications, capable of taking off and landing on existing airport infrastructure.

CEO / Founder: Zach Shore
Team Size: 201-500
Stage: Growth Stage
Total Funding: $500.0M
Latest Round: Series C
Key Investors: Sam Altman, Khosla Ventures, Founders Fund, Canaan Partners, RTX Ventures, Cox Enterprises, Socium Ventures, Destiny Tech100, Georgia Tech Foundation, 137 Ventures, GSBackers, In-Q-Tel, Bling Capital

Technology & Products

Key Products

Quarterhorse (Autonomous flight test vehicle for high-speed validation), Darkhorse (Uncrewed hypersonic military aircraft for ISR and strike missions), Halcyon (Commercial hypersonic passenger aircraft designed for Mach 5 travel), Chimera & Chimera II (Turbine-Based Combined Cycle propulsion systems), HEAT (High Enthalpy Air-Breathing Test Facility for engine testing)

Technological Advantage

Employs a 'Silicon Valley' approach to aerospace by using rapid iterative hardware development, heavy integration of metal additive manufacturing (3D printing), and hardware-in-the-loop testing to reduce development costs and timelines.

Differentiation

Value Proposition

Radically reducing global travel times and providing high-speed tactical advantages through reusable hypersonic platforms that integrate with existing aviation infrastructure.

How They Differentiate

Proprietary Turbine-Based Combined Cycle (TBCC) engine (Chimera) allows for takeoff and landing on existing airport runways; rapid hardware-rich iterative development approach.

Market & Competition

Target Customers

U.S. Department of Defense (Air Force), NASA, and future commercial airline operators.

Industry Verticals

Aerospace, Defense, National Security, Commercial Aviation

Competitors

Boom, Spike Aerospace, Venus Aerospace

Growth & Milestones

Growth Metrics

Reached Unicorn status with a $1B+ valuation following Series C.

Major Milestones

Successful ground test of Chimera engine (Turbojet to Ramjet transition) in 2022, Rollout of Quarterhorse Mk 1 flight test vehicle in 2024, Achievement of Unicorn status following $350M Series C in Apr 2026, FAA grants Special Airworthiness Certificate for Quarterhorse Mk 2.1 (Mar 2026), First unmanned supersonic flight achieved (May 2026), Zach Shore appointed CEO, AJ Piplica transitions to Executive Chairman (June 2026)

Notable Customers

U.S. Air Force, NASA

https://www.hermeus.com

Why this company matters

AMPulse analysis, not a company disclosure

Hermeus is developing reusable hypersonic aircraft capable of Mach 5 flight while operating from existing airport infrastructure. The company's core differentiator is its proprietary Turbine-Based Combined Cycle (TBCC) engine architecture, which uses a turbojet for runway takeoff and landing before transitioning to a ramjet for sustained hypersonic cruise. This eliminates the need for rocket-boosted launch systems and positions Hermeus to serve both defense and commercial aviation markets.

The company's product line includes the Quarterhorse autonomous flight test vehicle, the Darkhorse uncrewed military aircraft for intelligence, surveillance, and reconnaissance (ISR) and strike missions, and the Halcyon commercial passenger aircraft. Propulsion is provided by the Chimera and Chimera II TBCC engines, with the latter integrating F100 engine cores from Pratt & Whitney. Hermeus also operates the HEAT test facility for high-enthalpy engine validation.

Metal additive manufacturing is central to Hermeus's rapid iterative development approach. The company partners with Velo3D for advanced metal AM production of engine and airframe components, enabling faster design-build-test cycles than traditional aerospace programs. This 'Silicon Valley' hardware-rich methodology has attracted significant government and venture backing, including collaboration with the U.S. Air Force through AFWERX and Edwards AFB, as well as technical exchange with NASA.

Hermeus reached unicorn status with a $1B+ valuation following a $350M Series C in November 2024. Key investors include Sam Altman, Khosla Ventures, Founders Fund, Canaan Partners, RTX Ventures, Cox Enterprises, and In-Q-Tel. The company faces competition from Boom Supersonic, Spike Aerospace, and Venus Aerospace, but its TBCC engine and runway-operable hypersonic platform represent a distinct technical path. Open questions include the timeline to operational military deployment and the commercial viability of Mach 5 passenger travel given regulatory and noise constraints.