Toreon
TLDR
Toreon is an Antwerp-based Cybersecurity consultancy focused on business-driven security, with particular expertise in threat modelling and application security.
Overview
Founded in 2014 and headquartered in Antwerp, Toreon takes a business-first approach to Cybersecurity consulting. Rather than leading with pure technical tooling, Toreon helps organisations embed security into their software development lifecycle and business processes.
The firm is known for its expertise in threat modelling, application security (AppSec), and DevSecOps practices. With over 60 employees, Toreon serves mid-market and enterprise clients across Belgium and the Netherlands.
CEO Sebastien Deleersnyder is a recognised figure in the international application security community, contributing to OWASP projects and thought leadership in secure software development.
Key People
- Sebastien Deleersnyder - CEO and co-founder
Connections
Operates in the Belgian Cybersecurity cluster alongside NVISO Security, Intigriti, and Aikido Security.
- CISO – Chief Information Security Officer (as a service – Belgium)
- Information Security Officer
- TRAINEESHIP Cyber Risk & Information Security Officer (recent graduates – Belgium)
- Freelance cybersecurity consultant Toreon
- Microsoft 365 Consultant specializing in Purview
- Medior Intune & M365 Modern Workplace Consultant
- FREELANCE CISO – Chief Information Security Officer (as a service – Belgium)
- CRA compliance is coming fast. Is your vulnerability prioritization strategy ready? The EU Cyber Resilience Act is raising the bar for product security, and for many organizations, the challenge is noLinkedIn · 22 May 2026
- België heeft vandaag iets in handen dat veel groter is dan “compliance” of “IT security”. In de recente Voka-paper over weerbaarheid wordt het scherp gesteld: België zit in de internationale kopgroep LinkedIn · 28 Apr 2026
- NL (EN below) AISI (AI Security Institute) toont dat Claude Mythos Preview een duidelijke sprong maakt in cyber-capaciteiten: niet alleen beter in CTF’s, maar ook in multi-step aanvalssimulaties (keteLinkedIn · 27 Apr 2026