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We invest in future
global tech champions

Backing early-stage companies in tech and deep tech, from AI to quantum, from Europe to the world

We invest in tech 

and deep tech with
operator insight

More than just investors, we strive to create lasting value through real understanding, active involvement, and hands-on operational support. Especially when it comes to scaling companies across Europe.

Our strategy is based on the team’s operational and investment background in three major themes:

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    Future of Compute

    Foundations behind the AI era

    • Semiconductor
    • Cloud & Edge
    • Quantum
    • Clean Compute
    Portfolio companies
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    Physical AI

    Intelligence embodied

    • Robotics
    • Autonomous systems
    • New Space
    • DefenseTech
    Portfolio companies
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    Augmented Enterprise

    Turning work into software

    • Agentic Systems
    • Industrial Software
    • CommerceTech
    • Cybersecurity
    Portfolio companies

Rooted in Europe, open to the world

We are a team of seasoned tech operators who know how to navigate and scale across complex markets.
We back Europe’s most ambitious founders building global companies.
We help US and Israeli companies expand and win in Europe.
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02
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We invest early 
and support consistently

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    Series A

    And selectively late Seed and Series B

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    €2-5M
    ticket size

    + Additional reserves

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    Lead or
    co-investor

    We’re proud to partner with investors who share our vision.

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    Board or
    Observer seat

    The more we know, 
the more we can help

People, product, and technology

We invest where exceptional talent, product excellence, and deep tech innovation meet.
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  • It’s all about People

    We back visionary founders who move fast, think big, and inspire those around them. What sets them apart isn’t just ambition, it’s the ability to attract top talent, execute with discipline, and lead with clarity through every stage of growth. At the heart of every great company, there’s a great team.

  • We are Product lovers

    We’re passionate about products that feel inevitable, not because of hype, but because they solve real problems with beauty and precision. Whether it’s hardware that moves with intelligence, or software that just works, we seek out products that reflect deep craft, user empathy, and an eye for detail.

  • We believe in Technological moats

    Defensibility matters. We invest in companies with true technological edge, not just faster, but harder to replicate. From novel chip architectures to cognitive robotics and privacy-resilient platforms, we look for deep tech that unlocks new capabilities and compounds over time. These aren’t just features — they’re moats.

We invest where we can bring more than just capital.

We’re not a fund, we’re a team of operators — boutique, focused, and deeply involved.

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Hands-on support from committed partners
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In-house know-how in European go to market
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Proprietary network of European execs & operators
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Operating Partners network for unique expertise

What they say about us

Arago founders web
Nicolas Muller
“The depth and quality of conversation we’re able to have with the C4 Ventures team sets them apart. Innovating in the semiconductor industry is arguably one of the toughest challenges. Hundreds of billions of dollars have been invested in this space, making it extremely difficult for startups to break through. That’s why partnering with former operators from the industry was so important to us. ”

Co-Founder, Arago
Paul-Emmanuel Bidault
Paul-Emmanuel Bidault
“C4 Ventures is the rare kind of investor with an operator mindset, who rolls up their sleeves. They’re not just advisors, they are operating partners who understand the realities of building and scaling companies. Their support goes well beyond the boardroom and has a real impact on our execution.”
Co-Founder, Dastra
Nigel Toon
Nigel Toon
“C4 Ventures was among the earliest investors to spot the potential in Graphcore, and the AI compute opportunity more broadly. Their belief, and ongoing support enabled Graphcore to reach critical mass and ultimately bring our products to a global market.”
CEO, Graphcore
Eric Romo
Eric Romo
“From the beginning, C4 has shown a clear interest in the scope of what we’re building at Impulse – not just the technology, but also the long-term vision and the operational discipline behind it. They ask thoughtful questions, offer grounded perspectives, and have been engaged in key parts of the journey. C4 isn’t just investing in space – they’re paying attention to how it’s being built.”
President & COO, Impulse Space
Jean-Rémi de Maistre
Jean-Rémi de Maistre
“C4 Ventures stands out in the small world of venture capital. Not only do they bring deep product, technology and GTM expertise to the table, but they really are entrepreneurs first. I always felt like I had an extra co-founder supporting us and pushing us to achieve our best!”
CEO & Co-Founder, Jus Mundi
Emma McFerran
Emma McFerran
“Boris and the team at C4 Ventures demonstrated unwavering commitment to Lyst’s long-term success. The C4 approach goes beyond the typical investor relationship; as a team of ex-operators, they have advised and supported us through our biggest decisions, achievements and challenges.  Their strong backing, combined with deep operational expertise, has been essential in our realising our vision.”
CEO, Lyst
Konstantin von Bueren
Konstantin von Bueren
“C4 stands out not just as a capital partner, but as deeply thoughtful, founder-friendly allies – analytically sharp, well-versed in industry dynamics, and impressively connected across Europe and beyond. Choosing to work with them wasn’t a strategic debate – it was an obvious, instinctive decision.”
Co-Founder, Procure AI
Peter Windischhofer
Peter Windischhofer
“C4 Ventures are far more than just investors for refurbed, they are true partners for the past 5 years. From the very first conversations during due diligence, their depth of understanding, thoughtful challenge, conviction, and alignment with our values stood out. As refurbed grew from start-up to scale-up and now fully profitable across 12 markets, C4 have remained deeply engaged; bringing strategic insight at the supervisory board level, making valuable introductions, and offering thoughtful guidance through their partners. Among all our investors, C4 uniquely combines a founder-first mindset with practical experience that truly moves the needle.“
Co-Founder & CEO, refurbed