Introduction Organisations must move beyond reactive security postures and embrace data-driven decision-making as the sophistication and prevalence of threat actors continues to increase. For start-ups, especially those scaling rapidly or navigating compliance requirements, understanding and tracking the right cybersecurity metrics is crucial. Security metrics provide clarity: they help prioritise risks, optimise resource allocation, satisfy auditors, and demonstrate trustworthiness to investors and customers alike. But with dozens of potential indicators available, which metrics actually matter? This article outlines the key security metrics every modern organisation should be ...