Adversaries increasingly use automation and AI to move faster and operate at scale, placing sustained pressure on security operations. IBM needed to expand its 24x7 threat investigations without adding headcount or compromising governance or quality. At the same time, it aimed to reduce manual effort, investigation time and analyst alert fatigue. The challenge was to automate investigations at scale while maintaining trusted, explainable and auditable outcomes across global managed security services. Solution: IBM implemented ATOM as the central investigation and triage engine within its managed security services. ATOM autonomously investigates, enriches and scores alerts at scale using agentic AI, with human analysts focusing on oversight and escalation. Today, ATOM handles about 95% of daily investigations, delivering consistent, explainable and auditable results. IBM operates as Client Zero, running its global managed security services on ATOM. ATOM enables automation, improving speed, accuracy and investigation quality. ATOM applies deep context, correlation and explainable AI to strengthen detection while ensuring human-in-the-loop governance.