Quantum Systems closes Europe's largest defense tech Series D round: €1 billion

What happened?

Quantum Systems, a German company specializing in unmanned systems for defense, has announced the closing of a €1 billion ($1.2 billion) Series D funding round. The round was co-led by Blackstone, Noteus, Airbus and Advent, with participation from institutional investors such as BOND, Fidelity Management & Research Company, Wellington Management, A.P. Moller Holding and Elephant Lake Ventures, as well as existing shareholders like Balderton and HV Capital. The company's post-money valuation stands at around €7 billion ($8 billion), more than double its previous valuation, which was around €3 billion according to pre-round market estimates. Founded in 2015 by Florian Seibel and other entrepreneurs, the company has grown into a leader in fixed-wing and multirotor drones, as well as autonomy software and data analytics for defense.

Why is this important?

This round represents the largest financing operation in the DefenceTech sector in Europe to date, far exceeding the €500 million raised by French company Preligens in 2023. It reflects growing investor interest in autonomous defense technologies, driven by the war in Ukraine and rising European military spending, which NATO says grew by 11% in 2024. Quantum Systems has been profitable since 2022, with estimated revenues of €250 million in 2024, and operates in more than 30 countries. Its co-CEO Florian Seibel stated: "The future is unmanned. Defense will be defined by autonomous systems that operate together in real time across domains. With Quantum Systems, we are building a next-generation 'neo prime' with the potential to revolutionize defense as we know it." The capital injection gives it over $1.2 billion in cash to execute its expansion strategy, including acquisitions and development of new systems.

Industry context

The move comes amid a boom in defense spending in Europe and growing adoption of drones and autonomous systems. According to the European Defense Agency, defense spending by the 27 EU countries reached €290 billion in 2024, up 30% from 2021. In the drone space, the global military UAV market was valued at $12 billion in 2024 and is expected to reach $30 billion by 2030, according to MarketsandMarkets. In 2026 alone, EU-Startups has reported at least €68 million in comparable rounds in unmanned systems software, UAV guidance, counter-UAS, aerial intelligence, maritime autonomy and drone inspection. Quantum Systems' funding more than doubles any previous round in the sector, cementing its leadership. Additionally, the participation of Airbus, one of Europe's largest defense contractors, suggests a strategic alliance to integrate drones into existing platforms, similar to the collaboration between Boeing and Shield AI in the US.

Market consequences

The deal will have several consequences. First, it will accelerate consolidation in the European DefenceTech sector, with Quantum Systems as a potential acquirer or strategic partner. The company could acquire smaller startups such as Swiss Dufour Aerospace or British Sky-High, which specialize in high-capacity drones. Second, it will pressure European governments to update their procurement processes and adopt autonomous technologies, as Quantum Systems' systems offer lower costs and greater flexibility than traditional systems like the Eurofighter or Tiger helicopter. Third, it could incentivize the creation of new defense-focused investment funds, such as the €500 million fund launched by the European Investment Bank in 2024. Fourth, the round's success validates the business model of 'neo primes', startups that compete directly with major defense contractors, like Anduril in the US, which reached a $14 billion valuation in 2023. However, the entry of investors like Blackstone, known for its infrastructure focus, could create tensions between a startup's agility and long-term profitability demands.

What readers should know

Quantum Systems is not publicly traded, but its €7 billion valuation makes it one of Europe's most valuable unicorns, surpassed only by fintech Revolut (€33 billion) and tech company Celonis (€13 billion). The company was founded in 2015 by Florian Seibel, who previously worked at the German space agency DLR, and other entrepreneurs. Its flagship products include the fixed-wing drone Vector, used by Ukrainian armed forces for reconnaissance missions, and the multirotor system Scorpion, capable of operating in urban environments. It also develops AI-based autonomy software that allows drones to operate without human intervention in GPS-denied environments. The Series D round is a clear signal that private capital is betting on defense tech as a high-growth sector, but it also raises questions about autonomous weapons control and ethical regulation. The EU has yet to approve a specific regulatory framework for lethal autonomous systems, and the proliferation of drones could exacerbate risks of conflict escalation. However, Quantum Systems states that its systems comply with international humanitarian law and are designed to operate under human supervision.