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Underdog Security is an elite cybersecurity and penetration testing consultancy firm based in the United Kingdom. Boasting some of the best upcoming talent in the information security industry, with employees located in 3 different countries, Underdog Security aims to be everything that a client could ask for - and more. Offering a wide range of consultancy services from full blown blackbox penetration tests simulating a real-world attack, to manual source code review - we've got you covered.

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The Underdog Security annual revenue was $2.6 million in 2026.

Underdog Security is based in London, Greater London.

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