IBM shares fall 5.18% premarket after disappointing software sales and AI mainframe results.

International Business Machines Corporation (IBM) fell 5.18% in premarket trading. The decline is likely due to the disappointing software sales reported in the second quarter of 2025, which overshadowed the company's AI mainframe performance. Despite strong margin expansion and an increased outlook for profit and free cash flow, the market appears to have reacted negatively to the software sales figures.