Fundraising Fox
Positron Ventures
Venture capitalAmsterdam · Pre-Seed–Seed · 8 people tracked
Also known as Positron
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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 check, often engaging with founders before incorporation and leading early rounds. It targets deep science and spinouts spanning areas such as fusion and nuclear energy, quantum computing, advanced materials, biotech, and climate/energy storage, and provides hands-on support across all aspects of company building when needed.
Source: firm website, verified Sep 20, 2026.
Team · 8 people
from the firm's website & public directories
What they invest in
from 13 of 20 portfolio companiesDeep Tech ×7Cleantech ×6Biotech ×5Climate Tech ×5Energy ×5AI & Machine Learning ×2Healthtech ×2Medical Devices ×2
HQs:Netherlands×6Germany×2Switzerland×1France×1United States×1
Investments · 20 tracked
founders shown can be your intro pathBy year:2026 · 32023 · 12022 · 15 dated
CimCure 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(CSO)inDiederik Engbersen(CEO)in
43 is an early-stage venture firm that invests up to $500k in founders and provides hands-on fundraising guidance, investor introductions, a 1:1 partner relationship, and access to a founder co-working space.
Sector Agnostic
Dustin Dolginow(Co-founder & Partner)in
Co-investorsAtacama VenturesHV CapitalNew Enterprise Associates (NEA)WestBridge Capital
Aevo Loop develops chemical building blocks based on dicarboxylic acids that enable plastic polymers to be easily recycled and composted while maintaining structural integrity.
Advanced ManufacturingCircular EconomyCleantechDeep TechNew MaterialsLeipzig, DE
Timo Wittin
Co-investorsbmp Ventures
CellX Biosolutions develops a biological method that uses bacteria to break down PFAS ("forever chemicals"), positioned as an alternative to conventional disposal methods.
BiotechCleantechClimate Tech
Estelle Clerc(CEO)in
Co-investorsKickfund
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)inJohanna Winter(Co-founder & Chief Technology Officer)inHans Maria Heÿn(Co-founder & Chief Executive Officer)in
Co-investorsxista science venturesCaesar VenturesHTGF
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 iron-air battery technology for renewable energy storage using cost-effective, recyclable materials like iron, water, and air.
CleantechClimate TechDeep TechEnergy
Oshima is a metascience company building a new way to represent scientific literature, breaking research papers into claims, experiments, and evidence rather than treating papers as the base unit of knowledge.
AI & Machine LearningDeep TechSaaS
BoardCarla Ostmannin
Renaissance Fusion develops fusion energy technology in Grenoble, France, focusing on high-temperature superconductors and liquid metal technologies to create clean, abundant energy.
CleantechClimate TechDeep TechEnergyGrenoble, FR
Francesco Volpe(Founder)inMartin Kupp(Founder)in
Co-investorsLowercarbon CapitalBpifranceExcellis HoldingHCVCJuniperSommet AB+3 more
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A foundation providing educational information about molten salt reactors and thorium technology as potential solutions for fossil-fuel-free energy transition.
CleantechClimate TechDeep TechEnergy
BoardGijs Zwartsenberg(Chair)K. Bos(Secretary)S. Barlag(Treasurer)
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(CEO)inTom Hartke(CTO)in
Co-investorsFundersClubPioneerSBXiTranspose Platform ManagementUnpopular VenturesY Combinator+2 more
Waterland is a private equity firm that invests in and supports ambitious entrepreneurs through tailored buy-and-build strategies to drive company growth.
Sector Agnostic
Co-investorsIreland Strategic Investment Fund
Other
Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.
Institut d’OptiquemergerPASQALQu&CoTriple Bio
Portfolio news
latest coverage across their companiesOre Energy · finsmes.com · Aug 5, 2026
CollimateHealth · finsmes.com · Jun 15, 2026
Frequently asked questions
- How many investments has Positron Ventures made?
- Positron Ventures has 20 tracked investments, including 3 dated in the last 24 months.
- What stage does Positron Ventures invest at?
- Positron Ventures invests at the Pre-Seed, Seed stages.
- What sectors does Positron Ventures focus on?
- Positron Ventures focuses on AgTech, Biotech, Cleantech, Climate Tech, Deep Tech, Energy, FoodTech, Hardware, New Materials, Quantum Computing, SaaS.
- Where is Positron Ventures located?
- Positron Ventures is headquartered in Amsterdam, NL.
- Does Positron Ventures lead rounds?
- Yes, Positron Ventures leads investment rounds.
- Who does Positron Ventures co-invest with?
- Positron Ventures most often shares deals with Runa Capital, FundersClub, HCVC, among 16 tracked co-investors.
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