This document is a guide focused on mitigating insider risk and addressing various types of insider threats within organizations. It defines key concepts such as 'Insider,' 'Insider Risk,' and 'Insider Threats,' providing a clear framework for understanding the potential dangers posed by individuals with authorized access to organizational assets. The guide outlines several insider threat drivers, including self-serving motives, ignorance, complacency, and malicious intent. It details specific types of insider incidents, such as security compromises, information theft, and sabotage, and suggests mitigation strategies tailored to different insider personas. The guide emphasizes the importance of monitoring user behavior and implementing security measures to detect anomalous activities that may indicate insider threats. Additionally, it discusses the necessity of aligning security controls with the nature of each incident type to effectively manage insider risks. The document serves as a comprehensive resource for organizations seeking to enhance their security posture against insider threats.