Sierra Space Corporation, a Louisville, Colorado-based defence-tech space company, has raised $550 million in a Series C equity funding round led by LuminArx Capital Management.
The round also saw participation from General Atlantic, Coatue, Moore Strategic Ventures, and Andalusian Private Capital, among others.
The company has a post-money valuation of $8 billion.
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The company plans to use the funds to strengthen its national security space efforts by expanding production capacity and continuing to develop unique solutions for its customers.
Sierra Space is a defence-tech space company that provides solutions for important national missions. Since 2021, the company has undergone a strategic transformation better to meet the needs of its national security customers. According to Board Chair Fatih Ozmen, Sierra Space has increased its focus on national security by developing solutions that support U.S. leadership in space and defence, helping prepare the company for its next stage of growth. He also thanked new investor LuminArx Capital for its support and flexible funding approach, which positions the company well for the future.
Sierra Space has supported more than 500 missions and has over 30 years of spaceflight experience. In the past five years, the company has also reached several important milestones, including:
Sierra Space has achieved several key milestones in recent years. The company won major contracts, including a $450 million deal to build more than four satellites for a national security customer and a Space Development Agency Tranche 2 Tracking Layer contract worth up to $740 million to build 18 satellites for missile warning, tracking, and fire control. It has also received contracts from nearly all eight space procurement agencies within the Department of Defence and the Intelligence Community.
Last year, the company completed a new power station facility to manufacture high-rate solar arrays for important satellite missions. In 2025, Sierra Space also completed the Critical Design Review for two major national security satellite programs. She finished all manufacturing and assembly milestones for the Dream Chaser spaceplane, with a demonstration flight planned for late 2026.
“We are excited to partner with Sierra Space to support the growth of a strong leader in the defence-tech space market,” said Min Htoo, Co-founder and Chief Investment Officer of LuminArx Capital. “Among the many companies we reviewed in this sector, Sierra Space stands out because of its skilled team, strong technical expertise, and proven track record. Fatih Ozmen and Eren Ozmen have built their businesses with humility, integrity, and a strong sense of responsibility to the country—values that are clearly reflected in Sierra Space. We look forward to strengthening our partnership as the company expands its national security solutions and continues to grow.”
“Sierra Space is at an important stage of growth,” said CEO Dan Jablonsky. “Strong investor support, rising customer demand, and our operational readiness are coming together to help us scale the business. We are focused on expanding our proven defence and civil space capabilities and delivering mission-critical solutions with the speed and reliability our customers expect.”
About Sierra Space
Founded in 2021 and headquartered in Colorado, Sierra Space is a defence-tech space company that designs, manufactures and delivers satellites, spacecraft and space systems, including reusable spaceplanes, hypersonic technologies, propulsion systems, and space infrastructure for critical missions. With more than 30 years of spaceflight experience and advanced infrastructure, the company is trusted by national security, civil, and commercial customers.
Its flight-proven technologies support critical missions, including protecting national security, safeguarding space assets, and enabling future space exploration and economic growth. Sierra Space aims to help shape the next era of space defence while supporting long-term freedom and security in space.
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