Why Is CrowdStrike (CRWD) Stock Up 5.26% Today, Oct 21? NVIDIA Partnership and Strong AI-Security Demand Lift Shares

CrowdStrike (CRWD) rose 5.26% to $239.34 on October 21, 2026, as an expanded NVIDIA AI-agent security collaboration met a stronger market bid for AI-linked stocks. This draft examines the two catalysts, trading risks, and technical levels shaping the next move.