On October 17, 2025, Microsoft Corporation's stock traded at $510.50 (-0.22%) during live trading, following a week of modest declines. The company is in the spotlight due to several significant developments: it released its October 2025 Patch Tuesday security updates, addressing 172 vulnerabilities including six zero-day flaws, coinciding with the end of free Windows 10 support and a push for extended security updates[1][4]. Additionally, Microsoft announced new AI features for Windows 11 PCs, aiming to bridge the gap between current and next-generation 'AI PCs,' with enhanced natural interaction and automation capabilities[3]. Separately, Microsoft is accelerating its supply chain shift out of China, targeting 2026 for the majority of its hardware production to occur internationally, reflecting broader industry responses to geopolitical risks[2]. No single event has triggered a sharp price move, but these major product, security, and operational updates are shaping investor sentiment.