Positron Ventures
Venture capitalAmsterdam · Pre-Seed–Series A · 8 people tracked
Investment thesis
Positron invests in outstanding scientist-entrepreneurs across the natural sciences, backing teams from day one as they pursue solutions to major global challenges. The firm frequently acts as the first believer and first investor in a venture, writing initial checks for founders building science-based companies or spinning out research. Beyond capital, Positron offers hands-on support across all aspects of company building, drawing on its team's operating and scientific backgrounds. It targets deep-tech and natural-science ventures at their earliest stage.
Source: firm website, verified Aug 7, 2026.
Team · 8 people
from the firm's website & public directories
What they invest in
from 13 of 18 portfolio companiesDeep Tech ×6Biotech ×5Cleantech ×5Energy ×5Climate Tech ×3AI & Machine Learning ×2Healthtech ×2Medical Devices ×2
HQs:Netherlands×5Germany×2Switzerland×1France×1United States×1
Investments · 18 tracked
founders shown can be your intro pathCimCure develops active cancer vaccines that use its proprietary Immune-Boost (iBoost) technology to prompt the body to produce antibodies that attack and destroy the blood vessels feeding solid tumours, stopping cancer growth.
BiotechHealthtechMedical DevicesAmsterdam, NL
Arjan Griffioen(Co-founder & Chief Scientific Officer)Diederik Engbersen(CEO)
aevoloop develops fully recyclable, bio-based and biodegradable polymers with heteroatom-based breaking points that enable low-energy chemical recycling into reusable building blocks.
Circular EconomyDeep TechNew MaterialsLeipzig, DE
CollimateHealth develops a clinically scalable microbeam radiation technology for cancer treatment, delivering arrays of narrow, micrometer-scale radiation beams at higher doses than conventional broad-beam radiation oncology.
BiotechHealthtechMedical Devices
Stefan Bartzsch(Co-founder & Chief Scientific Officer)Johanna Winter(Co-founder & Chief Technology Officer)Hans Maria Heÿn(Co-founder & Chief Executive Officer)
I amsterdam is a city guide for Amsterdam offering an events calendar, tips for activities, restaurant and neighborhood recommendations, and a cultural newsletter.
Media & EntertainmentTravel & HospitalityAmsterdam, NL
Ore Energy develops long-duration energy storage using iron-air batteries that store renewable electricity through a reversible rusting process with abundant materials.
CleantechClimate TechEnergy
Co-investorsRuna Capital
Renaissance Fusion builds stellarators—magnetic-confinement fusion machines—using High Temperature Superconducting (HTS) magnets and liquid metal shields to enable clean energy generation.
CleantechDeep TechEnergy
Co-investorsExcellis HoldingHCVCJuniperSommet ABUnruly CapitalLowercarbon Capital
Thomsr focuses on thorium molten salt reactor technology, a nuclear energy concept originally demonstrated in the 1960s, positioning it as a clean and long-lasting energy source that can complement solar and wind.
CleantechDeep TechEnergy
Undermind provides AI-powered research discovery tools that help R&D teams find relevant scientific papers and research quickly.
AI & Machine LearningBiotechDeep TechEnterprise SoftwareSan Francisco, US
Joshua Ramette(Founder)inTom Hartke(Founder)in
Co-investorsUnpopular VenturesY Combinator
Portfolio news
latest coverage across their companiesFrequently asked questions
- How many investments has Positron Ventures made?
- Positron Ventures has 19 tracked investments.
- What stage does Positron Ventures invest at?
- Positron Ventures invests at the Pre-Seed, Seed, Series A stages.
- What sectors does Positron Ventures focus on?
- Positron Ventures focuses on AgTech, Biotech, Cleantech, Deep Tech, Energy, FoodTech, Hardware, New Materials, SaaS.
- Where is Positron Ventures located?
- Positron Ventures is headquartered in Amsterdam, NL.
- Who does Positron Ventures co-invest with?
- Positron Ventures most often shares deals with Advent Life Sciences, Compound, Forerunner Ventures, among 11 tracked co-investors.
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