Week in Space Data, every Friday.
Hermeus is developing hypersonic aircraft and reusable space access vehicles powered by turbine-based combined cycle engines, spanning defense and commercial applications.
ACTIVEHermeus is developing hypersonic aircraft and reusable space access vehicles powered by its turbine-based combined cycle engine technology. The company bridges the gap between high-speed atmospheric flight and space access for both defense and commercial applications.
Hermeus Corporation is a venture-backed aerospace startup developing hypersonic aircraft capable of Mach 5+ speeds using its proprietary Chimera turbine-based combined cycle (TBCC) engine. The company's Quarterhorse and Darkhorse autonomous aircraft programs are designed for rapid global strike, ISR, and eventually point-to-point hypersonic transport. Hermeus has secured contracts with the U.S. Air Force and DARPA, and its engine technology has potential applications for reusable space access vehicles that could transition from air-breathing to rocket propulsion for orbital insertion.
Latest funding round
Growth · $350M
Apr 7, 2026 · led by Khosla Ventures
Turbine-based combined cycle engine capable of transitioning from subsonic turbofan to ramjet mode, enabling Mach 5+ flight with potential space access applications.
Autonomous hypersonic aircraft demonstrator designed to validate Chimera engine technology at Mach 5+ speeds.
| Hermeus Headquarters & Test Facility | headquarters | Atlanta, United States |
Checking for a discussion…
Compiled Sep 28, 2026 from 6 public records. Every figure links the record it comes from.
Form D notices
4 offerings reported on Form D
Latest filed Apr 14, 2026; first sale Aug 29, 2025; 1 of them last updated by an amendment (D/A)
Each offering counts once: a later amendment (Form D/A) replaces its original. Form D names no round label and no investors. Filings for a merger or SPAC deal are left out.
Latest sourced round
Growth: $350.0M
Lead recorded as Khosla Ventures
Source: TechCrunch
Announced Apr 7, 2026
Sourced rounds on record
5 rounds, $729.4M disclosed
Every round has a disclosed amount; we hold 1 more round with no source link, not counted here
Published rounds with a source link only, on the same rules as the funding tracker. Each round links the source that states its figure; amounts in other currencies are converted to dollars at the rate shown on the funding tracker.
Khosla Ventures
Recorded as lead of Growth (Apr 7, 2026)
TechCrunch, Apr 7, 2026
APA
SpaceNexus. (2026, September 28). Hermeus: Company dossier [Data set]. Retrieved September 28, 2026, from https://spacenexus.us/company-profiles/hermeus
Chicago
SpaceNexus. "Hermeus: Company dossier." Data as of September 28, 2026. Accessed September 28, 2026. https://spacenexus.us/company-profiles/hermeus.
BibTeX
@misc{spacenexus_hermeus_2026,
author = {{SpaceNexus}},
title = {{Hermeus}: Company dossier},
year = {2026},
month = sep,
howpublished = {\url{https://spacenexus.us/company-profiles/hermeus}},
url = {https://spacenexus.us/company-profiles/hermeus},
urldate = {2026-09-28},
note = {Data as of 2026-09-28; each fact links its primary source}
}