Hermeus Raises $350M Series C to Accelerate Hypersonic Aircraft Development

There’s fast, and then there’s Hermeus fast. The kind of fast that doesn’t just shave time, it makes time nervous. Out of Los Angeles, a defense aviation company decided cruising speed wasn’t interesting unless it started with Mach, and now the market just co-signed that conviction with $350M in fresh capital at a $1B valuation. Not hype, not smoke, just velocity meeting belief at exactly the right altitude.

The Series C splits clean and surgical: $200M in equity, $150M in debt. Khosla Ventures led the charge, backed by a coalition that reads like a who’s who of serious capital with a taste for hard problems. Canaan Partners, Founders Fund, RTX Ventures, Bling Capital, and In-Q-Tel doubled down. Then you’ve got Cox Enterprises with Socium Ventures, Destiny Tech100, Georgia Tech Foundation, 137 Ventures, and GSBackers stepping in. Debt lined up from Silicon Valley Bank under First Citizens, Pinegrove Venture Partners, Hercules Capital, and Trinity Capital. That’s not just a round, that’s alignment with intent.

AJ Piplica (CEO) and Steve Furger (CTO) aren’t selling dreams, they’re building machines that move at the edge of physics and patience. Since 2018, Hermeus has been chasing high-Mach, autonomous aircraft for national security, leaning into a hardware-first model that actually flies instead of presenting well. Multiple prototype milestones in under a year. Government contracts north of $60M. When the work speaks, the room listens a little closer.

And the product vision is as sharp as it is ambitious. Quarterhorse pushing rapid iteration in flight testing. Darkhorse aimed at defense missions where speed isn’t optional. Halcyon sitting further out, hinting at a world where distance gets humbled. This isn’t one swing, it’s a pipeline of pressure on the limits of aerospace, built with intention and tested in motion.

The real takeaway lives between the lines. Capital followed cadence. Execution created leverage. Hermeus didn’t wait for perfect conditions, they built, flew, learned, and came back faster. That rhythm attracts investors who understand that in defense tech, timelines kill more ideas than competition ever will.

Now they’re sitting on over $500M total funding with a mandate to scale production, deepen autonomy, and tighten the loop between test and deployment. Different kind of company, different kind of clock. The sky isn’t the limit here, it’s just the proving ground.