Hermeus, an Atlanta-based developer of high-Mach and hypersonic aircraft for the U.S. Department of Defense, has raised $350M in Series C funding led by Khosla Ventures. The round, which includes $200M in equity and $150M in debt, values the company at $1B and will scale the Quarterhorse unmanned flight test program and production. This unicorn milestone follows two successful first flights in nine months and FAA certification for the latest prototype.
Hypersonic Funding Matches DoD Budget Surge
Hermeus' raise aligns with a wave of defense tech investments, including Castelion's $350M Series B for hypersonic missiles in July 2025 and Hypersonix's $46M Series A in October 2025. The U.S. DoD requested $6.5B for hypersonic weapons in FY2026, reenergizing efforts against adversaries. Competitors like Venus Aerospace ($106M+) and Destinus ($430M) target similar speeds but rely on rocket or hydrogen propulsion, while Hermeus uses turbine-based engines for runway takeoffs.
Adversaries Advance While U.S. Lags
Geopolitical tensions drive urgency, as China and Russia deploy hypersonic systems faster than U.S. counterparts. Traditional aerospace development spans decades, creating infrastructure shortages for testing. Hermeus addresses this by compressing timelines through hardware-rich iteration, delivering prototypes in months.
Iterative Prototypes Accelerate to Mach 5
The Quarterhorse program builds unmanned high-speed testbeds: Mk 0 prototype, Mk 1 first flight planned for 2025, and Mk 2.1 supersonic demonstrator with Pratt & Whitney F100 engine, which achieved first flight in March 2026. Darkhorse follows as a multi-mission reusable hypersonic UAS, powered by the Chimera turbine-based combined cycle engine that transitions turbine to ramjet. This approach—unlike rocket-dependent rivals—enables reusable operations from conventional runways.
As CEO AJ Piplica noted:
"We build a lot of hardware… if we can finance a large portion of our spend non-dilutively, it’s absolutely the way to do it."
Debt Mix Signals Manufacturing Push
Khosla Ventures led the equity portion, with debt funding non-dilutive manufacturing expansion, including the new Jacksonville HEAT hypersonic test facility. Government contracts exceed $60M, validating the dual military (Darkhorse) and potential civilian (Halcyon) paths. The investor blend underscores conviction in Hermeus' SpaceX-like rapid prototyping for national security.
$782M Market Grows Amid Competition
The hypersonic flight market stood at $782M in 2023 and projects to reach $1.15B by 2030 per MarketsandMarkets. Alternative estimates peg it at $14.46B with 26.51% CAGR via Precedence Research. Boom Supersonic has raised $1B for Mach 1.7 airliners, while Venus and Destinus chase Mach 5+ with different engines. Hermeus leads U.S. startups with actual flights and TBCC engine progress.
Founders Bring Hypersonic Pedigree
Co-founders hail from Generation Orbit's USAF X-60A hypersonic program: CEO AJ Piplica led overall development, Chief Technologist Glenn Case handled propulsion and structures, and Chief Product Officer Mike Smayda directed systems engineering. Additional experience includes SpaceX Falcon aerodynamics (Smayda) and Blue Origin engines (Case), enabling rapid iteration across airframes and engines.
Scaling Production and Teams
Post-funding, Hermeus nears 300 employees across Atlanta, Los Angeles, Jacksonville, and DC, hiring aggressively in engineering, manufacturing, and test operations. The company plans dozens of Darkhorse drones annually, national facility expansions, and supersonic envelope tests with Mk 2.1 toward hypersonic Darkhorse deployment.