IBM stock falls about 25% in its worst day on record

IBM shares fell about 25% on July 14, 2026, the largest one-day drop in the company's history, after the preliminary second-quarter warning. Fortune estimated the decline erased about $40 billion of market value. The move came as investors reassessed how quickly IBM's AI and software growth can offset its hardware cycle.

• About 25% decline on July 14, 2026
• Worst single-day move on record for IBM
• Roughly $40 billion of market value lost, per Fortune
• Trigger: preliminary Q2 revenue and EPS below expectations