SEF Ventures

Financing tech leaders of tomorrow

What we do

We invest in outstanding sustainable technology startups in Europe

  • Bioeconomy

    Alternative Materials

    Food & Feed

    Agro & Ocean

  • Circular Economy

    Material Solutions

    Waste Management & Recycling

    Water & Wastewater

  • Green Energy

    Renewable Energy Generation

    Energy Storage & Distribution

    Energy Efficiency

  • Enabling Technologies

    Process Technologies

    Sensor & Analytics Tech

    Software & AI

SEF Ventures is a newly established Venture Capital firm currently raising its first fund. We will invest in European startups with disruptive sustainable technology solutions in bioeconomy, circular economy and green energy sectors as well as related enabling technologies. Our founding team consists of experienced professionals with a long track record in financing startups as well as scaling technology innovations into commercial solutions in an industrial context.

Who we are

Experience and passion for sustainable ventures

We are five founding partners that see and serve a strong demand for Venture Capital teams providing hands-on, industry-driven support for startups along their development and growth path.

Bruno Rudnik

Managing Partner

Scaling cleantech startups for 15 years.
Passion for strategy, networking and circularity.

Bruno at LinkedIn

Klaus Tönnesmann

Managing Partner

25 years of experience in the financial industry.
Passion for green energy venture investments.

Klaus at LinkedIn

Dr. Lydia Simon

Managing Partner

30 years chemical industry experience.
Passion for people, technology, sustainability.

Lydia at LinkedIn

Oliver Borrmann


Entrepreneur and VC veteran financing cleantech startups since the late 90s.
Passion for company building.

Oliver at LinkedIn

Albrecht Läufer

Venture Partner

Bioindustry veteran, executive manager and serial entrepreneur.
Passion for bioeconomy.

Albrecht at LinkedIn