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IBM Shares Plunge 25% After Z Performance Concerns Trigger Probe

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IBM shares fell 25%, wiping out more than $68 billion of market capitalization in a day. The CEO warned shareholders of serious problems in IBM z performance after a July 14 preview of disastrous Q2 results, though later reporting showed a strong 2026 start with rising IBM Z and infrastructure revenues and confidence in growth. A shareholder rights firm is investigating potential U.S. securities-law violations, and a whistleblower program may award rewards up to 30% of SEC recoveries.

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