Sierra Space announced that it has raised $550 million in a Series C funding round led by LuminArx Capital Management, valuing the defense-tech space company at $8 billion post-money. The round also included participation from existing investors such as General Atlantic, Coatue, Moore Strategic Ventures, and Andalusian Private Capital.
The new funding brings Sierra Space’s total capital investments since 2021 to more than $2 billion and is expected to accelerate the company’s production capacity and development of advanced space technologies for national security customers.
Based in Colorado, Sierra Space develops satellites, spacecraft, propulsion systems, reusable spaceplanes, and other space infrastructure designed for defense, civil, and commercial missions. The company plans to use the fresh capital to expand its national security space initiatives, secure additional contracts, and scale production capabilities for mission-critical technologies.
Sierra Space has participated in more than 500 missions and brings over 30 years of spaceflight heritage. In recent years, the company has secured a number of major contracts, including a $450 million award to build more than four satellites for a national security customer and a Space Development Agency Tranche 2 Tracking Layer contract valued at up to $740 million to build 18 missile warning, tracking, and fire control satellites.
The company also recently completed a new power station facility for high-rate solar array manufacturing used in satellite missions. In 2025, Sierra Space completed the Critical Design Review for two major national security satellite programs and finalized manufacturing and assembly milestones for its Dream Chaser spaceplane, which is scheduled for a demonstration flight in late 2026.
Sierra Space said the investment strengthens its ability to deliver mission-critical space and defense capabilities while expanding production and technology development to meet growing demand from government and national security customers.
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“Since 2021, Sierra Space has undergone a strategic transformation, deploying trusted and responsive solutions to more closely align with the needs of its national security customers. Sierra Space has sharpened its focus toward national security customers by advancing solutions that strengthen American space and defense leadership, positioning the company for its next phase of growth. We appreciate the confidence shown by our new equity investor, LuminArx Capital, whose thoughtful, agile approach to capital solutions, positions the company strongly for the future.”
Fatih Ozmen, Board Chair, Sierra Space
“Among the many companies we’ve evaluated in the sector, Sierra Space distinguishes itself through its team, technical expertise, and execution history. Fatih and Eren have built their businesses with a rare combination of humility, integrity, and deep sense of responsibility to the country—values that are clearly embedded in Sierra Space. We look forward to growing our partnership with Sierra Space as they scale their mission-critical national security offerings and build their enduring legacy.”
Min Htoo, Co-Founder And Chief Investment Officer, LuminArx Capital Management
“Investor confidence, customer demand, and operational readiness are aligned, and that alignment is powering the intentional scaling of our business. Our focus is on expanding our proven defense and civil capabilities and delivering mission-critical solutions with the speed, reliability, and consistency our customers know us for.”
Dan Jablonsky, Chief Executive Officer, Sierra Space
