About us

Who we are

Where we
come from

Castra is a private investment company. We come from generations of entrepreneurs who believed in building for the long term, navigating cycles and hypes, and caring for the people around them. As a next generation, we carry that legacy forward. Our vision is a sustainable and equitable future for everyone.
‍
With roots in the built environment we now invest in those building that vision through a team of investment professionals. We believe impact is built together, and we look to partner with those with a shared purpose.

Our
core values

As an impact investor we are driven by values. These core values aren’t just words—they shape how we do business, how we treat people, and the kind of future we’re working toward: more sustainable, more inclusive, and built to last.

Ambition

We aim high and keep learning. We care about quality because that is what helps create lasting impact.

Reliability

We do what we say and we say what we do. Grounded and down-to-earth, just as you'd expect from our Dutch origin.

Commitment

We care about people, nurture relationships, and treat others with respect. We believe differences make us stronger.

Joy

We believe working together should also be fun. When people enjoy what they do, they go further and take others with them.

Our team

Nynke Slegten

Head of Impact Investing

As an investor and operator in tech, Nynke has built her career driven by impact and a constant desire for growth. She's a natural connector that enjoys building, innovation and creating more together.

Yorán Meijers

Investment Manager

A scientist turned investor. With over a decade in venture capital, entrepreneurship and corporates, Yorán brings a mix of strong people skills and deep technical understanding to help founders turn their vision into reality.

Are you looking to create world changing impact? Purpose-driven, non-concessionary on impact, laser focus one outcomes and in it for the long run. Lorem ipsum dolor sit amet, adipiscing elit.

Jans Janssen - Mitti Labs

Are you looking to create world changing impact? Purpose-driven, non-concessionary on impact, laser focus one outcomes and in it for the long run.

Jans Janssen - Mitti Labs

What people say about us

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Petra Petersen - Mitti Labs

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse varius enim in eros elementum tristique. Lo rem ipsum dolor sit amet, adipiscing elit. Lorem ipsum dolor sit amet, adipiscing elit.

Petra Petersen - Mitti Labs

What people say about us

Are you looking to create world changing impact? Purpose-driven, non-concessionary on impact, laser focus one outcomes and in it for the long run. Lorem ipsum dolor sit amet, adipiscing elit.

Jans Janssen - Mitti Labs

Are you looking to create world changing impact? Purpose-driven, non-concessionary on impact, laser focus one outcomes and in it for the long run.

Jans Janssen - Mitti Labs

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse varius enim in eros elementum tristique. Lo rem ipsum dolor sit amet, adipiscing elit. Lorem ipsum dolor sit amet, adipiscing elit. Lorem ipsum dolor sit amet, adipiscing elit.

Petra Petersen - Mitti Labs

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse varius enim in eros elementum tristique. Lo rem ipsum dolor sit amet, adipiscing elit. Lorem ipsum dolor sit amet, adipiscing elit.

Petra Petersen - Mitti Labs