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

8 past transactions

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.

CellX Biosolutions

Pre Seed Round in 2025
CellX Biosolutions is the Sustainable treatment of chemical waste.

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.

CimCure

Seed Round in 2022
CimCure is engaged in the design and development of innovative cancer immunotherapies, specifically focusing on the treatment of solid tumors. The company has pioneered a unique approach to cancer vaccines through its proprietary Immune-Boost-tailored conjugate vaccination technology. This method enables the targeted destruction of endothelial cells within tumors by identifying specific targets in the tumor vasculature. By effectively suppressing tumor growth, CimCure aims to enhance treatment outcomes for patients battling cancer.

PASQAL

Corporate Round in 2022
Pasqal SAS, founded in 2019 and headquartered in Paris, France, specializes in the manufacture of quantum information processors utilizing atomic arrays. The company focuses on developing full-stack quantum computing technology that simulates complex phenomena to facilitate scientific discovery. Its innovative approach employs qubits made of neutral atoms organized in large two-dimensional and three-dimensional arrays, which enables analog computing. This technology addresses a variety of challenges, including optimization, drug discovery, and machine learning, empowering organizations to tackle complex problems across these fields.

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.

Qu

Seed Round in 2021
Qu & Co is a prominent developer of quantum-computational algorithms and software, focusing on the optimization of specialty chemicals, pharmaceuticals, and functional materials. The company’s software enhances in-house discovery and optimization processes by advancing novel quantum-computational chemistry methods and seamlessly integrating with existing chemistry and material-science workflows. This enables industries such as pharmaceuticals to conduct complex chemistry and multiphysics simulations on future quantum processors. In January 2022, Qu & Co merged with PASQAL, a leader in neutral atom-based quantum hardware, solidifying its position as a key player in the European quantum computing sector.
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