<ul data-eligibleForWebStory="false"><li>Startup Castelion is raising a $350 million Series B, led by Lightspeed Venture Partners and Altimeter Capital.</li><li>The company, founded by former SpaceX executives, aims to transform the production of hypersonic missile systems, a crucial national security technology.</li><li>The U.S. government is concerned about China's advancements in hypersonic weapons, prompting interest in Castelion's approach to quickly build and test low-cost hypersonic missiles.</li><li>Castelion has secured grants from DoD offices and won a contract in the Army's fiscal year 2026 budget request for its Blackbeard Ground Launch hypersonic weapon.</li></ul>

Castelion is raising a $350M Series B to scale hypersonic missile business

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