Company Directory

Quantum Security Companies

101 companies across 26 countries, organised into 12 capability groups. From QKD hardware manufacturers to post-quantum cryptography specialists, this directory maps the organisations shaping quantum-safe security.

101 Companies
26 Countries
12 Capability Groups

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Quantum Investors

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Venture capital, corporate venture, and strategic investors active in the quantum security sector.

About This Directory

Every company in this directory has been researched and verified by the QSECDEF team. We cross-reference primary sources: company websites, official filings, product documentation, and peer-reviewed publications. Where a company lists capabilities, we check for evidence of deployed products or active programmes rather than accepting marketing claims at face value.

Company profiles are assigned to capability groups based on their primary technical focus. Some organisations span multiple groups; where that is the case, the profile appears under the most relevant category and cross-references the others. Tier designations (Expert Member, Corporate Member) reflect active QSECDEF membership at the time of last verification.

Verified March 2026

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