IBM shares plunge 25% after CEO warns of weak Q2 revenue and mainframe issues.

IBM's CEO revealed disappointing Q2 2026 results, with revenue growth only 1% and a 7% drop in Infrastructure revenue, mainly due to problems with IBM Z mainframe performance. This announcement caused IBM shares to fall 25%, wiping out over $68 billion in market value. Hagens Berman law firm is investigating whether IBM misled investors about its strong start to the year and delayed disclosure of deal failures. Investors with losses or insider information are encouraged to contact the firm as the probe continues.