Positron Ventures

Positron Ventures is a venture capital firm established in 2022 and based in Amsterdam, Netherlands. The firm focuses on investing in innovative startups within the life sciences and technology sectors, particularly those that aim to achieve significant advancements in environmental sustainability and health. By targeting companies that have the potential to drive transformative change, Positron Ventures seeks to support the development of solutions that can positively impact society and enhance quality of life.

Joseph Peeraer

Founding Partner

Past deals in Nuclear Energy

Thorizon

Series A in 2025
Thorizon is a deep-tech startup based in Amsterdam and Lyon that specializes in the development of thorium molten salt reactor technology aimed at sustainable energy production. Originating as a spin-off from the Dutch Nuclear Research Institute, the company seeks to create small modular nuclear reactors that complement renewable sources such as wind and solar. Thorizon is focused on rapidly developing a reactor that is both safe and capable of utilizing long-lived nuclear waste as fuel, thereby contributing to circular energy solutions. The company is currently enhancing its financial position to construct a non-nuclear molten salt demonstrator and finalize the design for its first reactor, Thorizon One, slated for completion by 2030. Collaborating with industry leaders like Orano, Tractebel, and EDF, Thorizon is recognized as a key player in advanced nuclear projects, being a laureate in the France 2030 program.

Renaissance Fusion

Seed Round in 2023
Renaissance Fusion is a company focused on developing high-temperature superconductors that facilitate advancements in fusion energy and medical imaging. By creating superconductors for stellarator plasma devices, Renaissance Fusion aims to make fusion electricity affordable and accessible, thereby integrating it into the energy grid. Additionally, their technology enhances the effectiveness of MRI machines, making them a routine and commonplace form of medical examination. Through these innovations, the company seeks to simplify the process of harnessing fusion energy and improve medical diagnostics.

Thorizon

Venture Round in 2022
Thorizon is a deep-tech startup based in Amsterdam and Lyon that specializes in the development of thorium molten salt reactor technology aimed at sustainable energy production. Originating as a spin-off from the Dutch Nuclear Research Institute, the company seeks to create small modular nuclear reactors that complement renewable sources such as wind and solar. Thorizon is focused on rapidly developing a reactor that is both safe and capable of utilizing long-lived nuclear waste as fuel, thereby contributing to circular energy solutions. The company is currently enhancing its financial position to construct a non-nuclear molten salt demonstrator and finalize the design for its first reactor, Thorizon One, slated for completion by 2030. Collaborating with industry leaders like Orano, Tractebel, and EDF, Thorizon is recognized as a key player in advanced nuclear projects, being a laureate in the France 2030 program.

Thorizon

Pre Seed Round in 2021
Thorizon is a deep-tech startup based in Amsterdam and Lyon that specializes in the development of thorium molten salt reactor technology aimed at sustainable energy production. Originating as a spin-off from the Dutch Nuclear Research Institute, the company seeks to create small modular nuclear reactors that complement renewable sources such as wind and solar. Thorizon is focused on rapidly developing a reactor that is both safe and capable of utilizing long-lived nuclear waste as fuel, thereby contributing to circular energy solutions. The company is currently enhancing its financial position to construct a non-nuclear molten salt demonstrator and finalize the design for its first reactor, Thorizon One, slated for completion by 2030. Collaborating with industry leaders like Orano, Tractebel, and EDF, Thorizon is recognized as a key player in advanced nuclear projects, being a laureate in the France 2030 program.
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