Stroom Fund III: Where We Are Looking in 2026
The four AI-security convergence themes driving Fund III deployment: autonomous detection, identity re-architecture, developer-embedded security, and zero-knowledge compliance infrastructure.
Security is not a layer you add.
It is an architecture you build.
Stroom Capital backs the engineers and founders building AI-native security infrastructure for the European digital economy. Three funds. Thirteen companies. Seed to Series A, from Amsterdam.
Read Our Thesis →AI-Powered Threat Intelligence
Threat actors move at machine speed. Human analysts cannot keep up without AI augmentation.
- EclecticIQ
- Hadrian
- Detectify
Identity, Detection and Compliance
Trust is earned by knowing who you're dealing with, detecting what threatens you, and proving you comply.
- Ondato
- Sekoia
- Sprinto
Security for the Developer
Security shifts left or it shifts too late. The next generation of platforms bakes it in.
- Aikido Security
- Sonar
- Orbit Security
Thirteen companies building the security infrastructure of the next decade.
Threat intelligence. Identity infrastructure. Developer security. Managed detection. Data-layer encryption. Each company in the portfolio is a security-first business — not a software business with a security module.
EclecticIQ
Hadrian
Detectify
Sekoia
Ondato
Zivver
Aikido Security
Orbit Security
Sprinto
Eye Security
Sonar
Sequretek
Cossack Labs
The team.
Willem de Vries
Managing Partner
Former CTO, enterprise security exit 2016
Martijn Hoekstra
General Partner
12 years red-team ops in financial services
Ilse van den Berg
Principal
Shipped biometric liveness at 10M verifications/month
Three operators. $168M deployed. Deep in cybersecurity since before it was a VC category.
From the team.
All Insights →What Founders Actually Want from Security-Focused Investors
Based on conversations with founders across the Stroom portfolio: the things security-focused investors often get wrong, and what operators actually want when they take capital from a technically credible firm.
Trust by Design: Principles for the Connected Enterprise
Six architectural principles for building durable digital trust — from identity-first access models and zero-trust microsegmentation to supply chain provenance and security-by-default API design.