Castelion, a rising star in the defense technology sector, has announced a massive $350 million Series B funding round to scale its innovative hypersonic missile business. The startup, focused on cutting-edge weaponry, aims to strengthen its partnership with the U.S. Department of Defense by accelerating production and development of advanced missile systems designed to counter modern threats.
Founded by former SpaceX engineers, Castelion is leveraging its expertise in rapid prototyping and modular design to create hypersonic weapons that travel faster than Mach 5. This speed offers a significant tactical advantage, enabling unparalleled precision and response times in critical military operations. The company’s flagship project, the Blackbeard Ground Launch missile, is already gaining attention for its potential integration with existing platforms like HIMARS.
The funding round, led by prominent investors such as Lightspeed Venture Partners and Altimeter Capital, reportedly values Castelion in the billions. This follows a $100 million Series A round earlier in 2025, signaling strong investor confidence in the startup’s mission to challenge established defense giants with faster, more cost-effective solutions.
Castelion’s collaboration with the U.S. Army is a key driver of this growth, with plans to test the Blackbeard missile in 2026 and begin field deliveries by 2028. CEO Bryon Hargis emphasized the importance of innovation, stating,
If we can build this better, faster, cheaper, both sides should be rewarded for that.
The hypersonic technology developed by Castelion is poised to redefine long-range strike capabilities, offering the U.S. military enhanced flexibility in addressing global security challenges. As geopolitical tensions rise, the demand for such advanced weaponry is expected to grow, positioning Castelion as a critical player in national defense.
While details of the funding and specific contracts remain under wraps, industry experts predict that Castelion’s breakthroughs could disrupt traditional defense manufacturing. With this $350M investment, the startup is set to accelerate its mission of delivering next-generation solutions to protect national interests.
Alfred Lee
