Leviathan Security Group
A well-established, 80-person offensive-security firm acquired by risk-management consultancy K2 Integrity (March 2026), roughly doubling K2's headcount to 380 and meaningfully expanding its penetration testing, red team, cloud and hardware security capabilities -- a substantive capability build, not a token bolt-on.
Visit Website ↗ + Add to CompareInnovation Matrix Assessment
Established, broad-based penetration testing and assessment services rather than a novel technical approach.
An 80-person team with nearly two decades of assessment work across software, network, IoT and hardware reflects substantial, proven operational depth.
March 2026 acquisition by K2 Integrity nearly doubles K2's headcount and meaningfully expands its offensive-security capabilities.
Traditional offensive-security services model; no category disruption.
Nearly 20 years of continuous operation and a broad multi-domain assessment practice is a credible, if not independently audited, efficacy signal.
Penetration testing, red teaming and vCISO services remain durable, recurring needs across most mature security programs.
Why CISOs Should Care
Leviathan Security Group, founded in 2006 by Frank Heidt, provides web application penetration testing, secure code review, network penetration testing, virtual CISO services, tabletop exercises, and IoT/smart-device and hardware security assessment.
What Makes It Different
Its breadth across software, network, IoT/hardware and vendor-security-management testing under one roof, sustained over nearly two decades, gives it more assessment surface coverage than narrower boutique pentest shops.
The Matrix Verdict
40/100 — EMERGING / UNRANKED
A well-established, 80-person offensive-security firm acquired by risk-management consultancy K2 Integrity (March 2026), roughly doubling K2's headcount to 380 and meaningfully expanding its penetration testing, red team, cloud and hardware security capabilities -- a substantive capability build, not a token bolt-on.
Editorial Note: Claims vs. Verified Findings
No independent, third-party audit of Leviathan's assessment methodology or historical finding accuracy is publicly available; treat quality claims as based on operating longevity and reputation rather than verified benchmarks.
Sources
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