Castelion Raises $1B Series C at $13B Valuation to Mass-Produce Hypersonic Missiles

Castelion, a defense technology company founded by former SpaceX engineers, raised $1 billion in Series C funding at a $13 billion valuation, announced August 20, 2026. The round was co-led by Andreessen Horowitz, The Carlyle Group, and JPMorgan Chase, with participation from T. Rowe Price, Lightspeed Venture Partners, Altimeter Capital Management, and General Catalyst. Of the $1 billion raised, $800 million is equity financing, while the remaining $250 million is committed financing for a revolving credit facility supporting working capital as the company adds factory capacity. The round arrives roughly 13 months after Castelion's $350 million Series B.

What Castelion Builds

Castelion, founded in 2022, designs and manufactures hypersonic weapon systems, aiming to produce them at lower cost and faster speed than traditional defense primes. The company has already secured more than $500 million in US military contracts, providing early commercial validation for its manufacturing approach ahead of full-scale production. Hypersonic weapons, capable of traveling at more than five times the speed of sound with maneuverable flight paths, have become a significant focus of US defense strategy as the Pentagon works to close a capability gap with China and Russia, both of which have fielded operational hypersonic systems in recent years.

Why the Round Structure Matters

The split between equity and credit facility financing reflects a financing approach increasingly common among capital-intensive defense manufacturing startups: raising growth equity to fund research, development, and near-term operations, while layering in debt-like credit facilities to fund the working capital needs of scaling physical manufacturing capacity. This structure allows Castelion to access capital for factory buildout without diluting equity holders as heavily as an all-equity raise of the same total size would require. See active deep tech and defense investors on AngelLinx for the broader landscape of funds backing companies building in this category.

The Defense Tech Funding Environment

Castelion's raise reflects a broader surge of venture and growth capital flowing into defense technology startups over the past several years, as investors have grown more comfortable backing companies that sell primarily or exclusively to government customers, a category that was largely avoided by traditional venture capital a decade ago. The jump from a $350 million Series B to a $1 billion Series C in just 13 months, alongside more than $500 million in secured military contracts, illustrates how quickly capital and revenue can scale for defense manufacturing companies that achieve genuine product-market fit with the Pentagon's procurement priorities.

What This Means for Founders

Castelion's raise is a strong data point for founders building in defense technology, advanced manufacturing, or dual-use hardware categories, showing that top-tier growth investors will commit billion-dollar rounds to capital-intensive manufacturing businesses when the underlying government contract pipeline validates the commercial thesis. For founders in this category, understanding your burn rate relative to manufacturing scale-up milestones, and structuring financing with a mix of equity and credit facilities where appropriate, are important considerations as you plan capital-intensive growth. Use the investor match tool to find investors with defense and deep tech portfolio experience.

See what other companies are currently raising on the AngelLinx live listing. Founders building in defense technology and advanced manufacturing can explore relevant investors on AngelLinx @ angellinx.ai/register.

AngelLinx Intelligence | angellinx.ai