Halcyon is a cybersecurity company founded in 2021 by veterans from Boldend, Cylance (Blackberry), Accuvant (Optiv), and ISS X-Force (IBM). The company specializes in anti-ransomware technology, building an enterprise platform designed to detect, prevent, and respond to ransomware attacks and advanced threats. The company's platform is purpose-built to address ransomware threats that evade traditional security tools, targeting mid-market and enterprise customers. Halcyon's approach combines detection capabilities with response mechanisms specifically engineered to counter ransomware operations. The company operates as a fully remote, globally distributed workforce headquartered in San Diego, California. The founding team includes CEO Jon Miller, who previously served as Chief Research Officer at Cylance and was an early employee at Accuvant, and CTO Ryan Smith, who has over 25 years of experience in vulnerability research, exploitation, and machine learning applications in security. Halcyon's technology focuses on preventing ransomware attacks from causing catastrophic organizational impact by addressing the limitations of modern security tools that may miss sophisticated ransomware variants. The platform serves organizations seeking dedicated protection against ransomware threats as part of their security infrastructure.