Reliable Robotics reaches unicorn status as Series D extension adds $115M in equity

Reliable Robotics has joined the unicorn club. The Mountain View, California-based developer of autonomous flight systems extended its Series D round with $115 million in equity and $25 million in debt. The round now totals $160 million. Nimble Partners led it, and the company’s post-money valuation comes to approximately $1 billion. What the money buys The company announced the raise on April 21, 2026. It says the capital will go toward three priorities. The first is scaling production of its Reliable Autonomy System, or RAS. The second is moving its FAA certification forward for uncrewed commercial cargo flights. The third is hiring people and building out facilities to support both efforts. RAS is designed to automate the full arc of a flight. That includes taxiing, takeoff, the enroute portion and landing. The company’s focus is fixed-wing aircraft. It is not building drones or air taxis. The equity-plus-debt structure of the extension is worth noting. Mixing $115 million in equity with $25 million in debt lets the company add capital without giving away as much ownership as an all-equity raise would require. A customer list that includes the Pentagon and NASA Reliable Robotics...