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StocksMedium•2 March 2026•

1 min read

IBM Stock Plunges 20% as Anthropic’s AI Tool Targets Core Mainframe Business

A large Intel CPU is centered on an orange background with manufacturing equipment, a worker, and upward financial arrows showing +4.85%.

Key Facts

1IBM stock plummeted 20.6% over the past three months, lagging the industry's 12.8% growth.

2Anthropic announced its Claude Code tool can modernize legacy COBOL systems.

IBM shares have experienced a significant sell-off, plummeting 20.6% over the past three months while the broader industry grew by 12.8%. The decline follows the introduction of Claude Code by Anthropic, an AI tool designed to automate the modernization of legacy COBOL systems. This technological breakthrough poses a direct threat to IBM's foundational mainframe ecosystem and its high-margin programming business. Traditionally, IBM has dominated the legacy infrastructure market, but AI-driven migration tools are lowering the barriers for clients to exit its proprietary environment. The emergence of generative AI capabilities that can refactor ancient code into modern architectures creates significant fundamental headwinds for the tech giant. Market analysts suggest that the disruption of IBM’s core services could lead to a long-term shift in how institutional clients manage their digital infrastructure.