C5 Capital

C5 Capital is a Washington, DC-based cybersecurity-focused growth equity firm founded by André Pienaar, investing in technology companies that protect critical national infrastructure, enterprise networks, and government systems against cyber threats. The firm was established around the thesis that cybersecurity is not merely a technology problem but a national security imperative, and that the most impactful investments at the intersection of cyber and national security require investors with deep policy relationships, intelligence community networks, and an understanding of government procurement. C5 Capital invests at Series B and growth stages with check sizes from $3 million to $15 million, typically partnering with companies that have demonstrated product-market fit in the enterprise or government market and are scaling their commercial operations. The firm operates at the junction of cybersecurity, national security, and deep technology, with a particular focus on companies whose solutions address emerging threat vectors including AI-enabled attacks, critical infrastructure vulnerabilities, and supply chain security risks. Portfolio companies include Arqit Quantum, the UK-based quantum encryption company that completed a Nasdaq listing via SPAC; Claroty, the industrial and operational technology cybersecurity platform; and X-Analytics, a cyber risk analytics platform. Note: Booz Allen Hamilton appears in the original directory's portfolio list, but Booz Allen is a large public management consulting firm, not a startup investment, and this appears to be a data error. Beyond its original investments in Arqit, Claroty, and X-Analytics, the portfolio includes additional cybersecurity companies addressing government and enterprise threats.