Key Takeaways
- • Hermeus closes $350M Series C round (structured as $200M equity + $150M debt) led by Khosla Ventures, achieving $1B valuation with total capital raised of $500M; round includes participation from Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, In-Q-Tel, Cox Enterprises, and Destiny Tech100.
- • Strategic engine partnership with RTX subsidiary: Hermeus shifted from developing proprietary engines to collaborating with Pratt & Whitney (RTX subsidiary) to modify the F100 engine for hypersonic aircraft power, reducing capital burn and accelerating development timelines.
- • Headquarters relocation to Los Angeles area: Company moving from Atlanta to El Segundo, California, while maintaining manufacturing operations in Atlanta; capital will fund multi-aircraft simultaneous production and scaled manufacturing capabilities.
- • Recent prototype validation: Hermeus tested Quarterhorse Mk 2.1 aircraft (F-16 sized) at White Sands Missile Range in March 2026; aircraft currently powered by conventional F100 engine with future ramjet upgrades planned for hypersonic capability.
- • Broader hypersonics funding momentum: Hermeus raise reflects $800M+ in defense and advanced technology capital deployed across multiple late-stage rounds in April 2026, signaling sustained institutional and venture appetite for next-generation defense platforms alongside nuclear energy and AI infrastructure investments.
Summary
Hermeus, a Los Angeles-based hypersonics startup, has secured $350 million in Series C funding, propelling the defense aviation company to unicorn status with a $1 billion valuation. The round comprises $200 million in equity financing and $150 million in debt, bringing total capitalization to $500 million. Khosla Ventures led the equity raise, joined by existing investors Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, and In-Q-Tel. New capital partners include Cox Enterprises (the media conglomerate's venture fund), Destiny Tech100, Socium Ventures, Georgia Tech Foundation, 137 Ventures, and GSBackers.
CEO AJ Piplica attributed the fundraising success partly to a technical pivot the company executed in recent years. Rather than bearing the full cost and complexity of developing a proprietary hypersonic engine, Hermeus shifted strategy to partner with Pratt & Whitney, an RTX Corporation subsidiary, to modify the aerospace company's proven F100 engine for hypersonic aircraft applications. This non-dilutive approach—particularly the $150 million debt component—allows the startup to preserve equity ownership while funding substantial hardware manufacturing expansion. According to Piplica, the capital will enable simultaneous construction of multiple aircraft and scaled production capabilities.
The company is advancing its Quarterhorse platform, a hypersonic unmanned military aircraft roughly equivalent in size to an F-16 fighter jet. In March 2026, Hermeus successfully tested the Quarterhorse Mk 2.1 prototype at White Sands Missile Range in New Mexico, marking a significant step forward. The current iteration operates with the conventional Pratt & Whitney F100 engine, but future variants will incorporate ramjet propulsion to achieve sustained hypersonic speeds. An earlier prototype test occurred in May 2025 with a smaller demonstrator one-third the size and one-quarter the weight of the Mk 2.1.
Hermeus' funding milestone reflects broader momentum in defense technology investment. Alongside Hermeus, nuclear energy startup Valar Atomics (backed by Anduril Industries founder Palmer Luckey and Palantir executive Shyam Sankar) raised $450 million at a $2 billion valuation in the same period. Together, these and adjacent funding rounds—including EnerVenue's $300 million Series B and Tenex AI's $250 million raise—demonstrate sustained institutional and corporate venture appetite for next-generation national security and advanced energy platforms. Global venture capital directed toward defense technology exceeded $9 billion across 265 rounds in the prior year, with corporate investors committing an additional $2 billion.
The headquarters relocation from Atlanta to El Segundo, California, signals scaling ambitions aligned with aerospace and defense clustering in Southern California. Manufacturing operations will remain in Atlanta, preserving operational continuity while the company expands its commercial and investor footprint in proximity to major defense contractors and venture capital ecosystems.
CEO AJ Piplica attributed the fundraising success partly to a technical pivot the company executed in recent years. Rather than bearing the full cost and complexity of developing a proprietary hypersonic engine, Hermeus shifted strategy to partner with Pratt & Whitney, an RTX Corporation subsidiary, to modify the aerospace company's proven F100 engine for hypersonic aircraft applications. This non-dilutive approach—particularly the $150 million debt component—allows the startup to preserve equity ownership while funding substantial hardware manufacturing expansion. According to Piplica, the capital will enable simultaneous construction of multiple aircraft and scaled production capabilities.
The company is advancing its Quarterhorse platform, a hypersonic unmanned military aircraft roughly equivalent in size to an F-16 fighter jet. In March 2026, Hermeus successfully tested the Quarterhorse Mk 2.1 prototype at White Sands Missile Range in New Mexico, marking a significant step forward. The current iteration operates with the conventional Pratt & Whitney F100 engine, but future variants will incorporate ramjet propulsion to achieve sustained hypersonic speeds. An earlier prototype test occurred in May 2025 with a smaller demonstrator one-third the size and one-quarter the weight of the Mk 2.1.
Hermeus' funding milestone reflects broader momentum in defense technology investment. Alongside Hermeus, nuclear energy startup Valar Atomics (backed by Anduril Industries founder Palmer Luckey and Palantir executive Shyam Sankar) raised $450 million at a $2 billion valuation in the same period. Together, these and adjacent funding rounds—including EnerVenue's $300 million Series B and Tenex AI's $250 million raise—demonstrate sustained institutional and corporate venture appetite for next-generation national security and advanced energy platforms. Global venture capital directed toward defense technology exceeded $9 billion across 265 rounds in the prior year, with corporate investors committing an additional $2 billion.
The headquarters relocation from Atlanta to El Segundo, California, signals scaling ambitions aligned with aerospace and defense clustering in Southern California. Manufacturing operations will remain in Atlanta, preserving operational continuity while the company expands its commercial and investor footprint in proximity to major defense contractors and venture capital ecosystems.
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