IBM or International Business Machines Corp had its worst day on stock market in more than 25 years on Monday, February 23.

IBM stock plunged on Claude Code COBOL fears, but Jefferies says IBM’s watsonx is already modernizing mainframes with GenAI—read more now.

On 23 Feb 2026, IBM shares dropped 13%, losing nearly $30B, after Anthropic's Claude AI promised faster COBOL modernization, ...

IBM shares suffered their worst single-day drop in over 25 years on Monday, February 23 after AI startup Anthropic announced ...

Anthropic unveiled new Claude functionality that can modernize COBOL code faster at scale, triggering a sharp drop in IBM ...

With the decline, IBM shares have fallen 27% in February, on track for its biggest one-month slide since at least 1968, ...