See Your Risks.Secure Them Faster.
We provide a clear picture of your cyber risks - across IT, OT, and your entire supply chain - so you can act before attackers do.
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What We Offer
Services and Products in one place.
IT Penetration
Testing
OT Penetration
Testing
Industrial
Cybersecurity
Due
Diligence
CISO
as a Service
Private Equity
Portfolio Monitoring
Strengthen Your IT Infrastructure with Expert Penetration Testing Services
Atumcell fortifies modern IT—from cloud to web—with precision and actionable security.
Trusted. Tested. Different.
Proven cybersecurity expertise with real-world results.
Built by Cybersecurity Operators
Hands-on experts with offensive and defensive field experience—not just theorists.
Unified IT & OT Coverage
End-to-end visibility across enterprise networks and industrial systems.
Real-Time Portfolio Monitoring
Track evolving risks across companies and suppliers instantly.
Clarity-First Reporting
Actionable, easy-to-understand reports for leadership and technical teams.
Testimonials
“In the medical device space, understanding emerging threats and supply chain risk is essential. Atumcell's threat intelligence keeps us informed, and their supply chain assessment gives us confidence in our vendor ecosystem. The portfolio dashboard ties everything together and provides clear visibility at the board level.”
Mike T., Chairman
Medical device developer
“We advise private equity firms on M&A transactions, and cybersecurity due diligence is a critical piece of that process. Atumcell works alongside our IT diligence team seamlessly. Their assessments are fast, thorough, and give our clients the clarity they need to make informed investment decisions.”
David L., Partner
Private equity M&A consultant
“Atumcell brings deep expertise in both IT and OT security, which is rare. They know how to test and monitor sensitive OT environments safely, something IT-only firms simply can't do. That capability has been critical for protecting our pipeline operations.”
Chris S., President and CFO
Midstream pipeline
About Atumcell
The team and vision behind Atumcell.
Our Mission
Atumcell exists to deliver clarity in cybersecurity — enabling businesses, investors, and industries to grow with confidence.
Our Difference
Atumcell brings expertise across IT, OT, and industrial systems, offering real-time visibility through proprietary tools like AtumScan and AtumScreen. Services are strategically tailored for C-suites, investors, and operators, with a firm commitment to responsible testing and actionable results.
About
Atumcell is a cybersecurity firm built for a world where IT, OT, and cloud converge. We combine deep technical expertise with real-world offensive security experience to uncover hidden risks before attackers do. Our team has been recognized for excellence in penetration testing, industrial cybersecurity, and threat intelligence.
Seeing is believing. Book a live demo and watch Atumcell uncover what's hiding in your infrastructure.
Book a Live DemoFounders & Advisors
Building Trust and Resilience in a Connected World
David Williams
Co-Founder | CEO
David brings decades of experience across healthcare technology, policy, and risk — working with The Boston Consulting Group and MedPharma Partners across North America, Europe, and Asia. He now focuses on using software to reduce drudgery and protect people from harm.
Matthew Carr
Co-Founder | Head of Research & Technology
Matthew is an award-winning cybersecurity researcher and penetration tester with senior roles at IKEA, IBM, and SecureLink. His research has been featured by the BBC, The Register, and Fox News — including two Zero-Day discoveries, one with national-security impact.
Mikael Totterman
Entrepreneur, technology executive, investor
Trevor McCaw
Technology entrepreneur, commercialization expert
Christy Alvord
Industrial executive, board member
Insight
Stay ahead with the latest publications, research briefs, and expert perspectives on cybersecurity.
Web App Penetration Testing
Driving Portfolio-wide Value with Cybersecurity
Atumcell Publications
Explore our latest whitepapers, case studies, and reports designed to strengthen security strategy.
Discover Your
Cyber Risk Level.
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