Microsoft stock crashes today: Why MSFT shares plunged nearly 12% today — Is AI taking its toll as Microsoft shares suffered their worst single-day fall in nearly six years

Microsoft stock crashes today: MSFT shares plunged nearly 12% today. Microsoft (MSFT) stock suffered a historic 11.91% crash on Thursday, January 29, 2026. This $400 billion wipeout followed the tech giant’s fiscal second-quarter earnings. Despite a revenue beat of $81.3 billion, investors focused on a staggering $37.5 billion in capital expenditure. This 66% surge in spending on AI data centers raised red flags about long-term margins. Azure cloud growth also cooled slightly to 38%, missing the most bullish analyst targets.