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StocksHigh ImpactUpdated×3•Originally published 23 February 2026•Updated 23 February 2026•

1 min read

IBM Stock Set for Worst Month in 34 Years Amid AI Disruption Fears

Key Facts

1IBM shares plummeted 11% following reports of a threat from Anthropic's AI programming language capabilities.

3 months ago

Version History

Version 33 months ago

What changed: The story was updated to include the fact that IBM's stock is now heading for its worst monthly performance in 34 years, placing the recent decline within a broader historical context beyond the single-day drop.

Version 23 months ago

What changed: The story was updated to identify Anthropic's 'Claude' model as the specific AI engine threatening IBM's legacy COBOL services.

Version 13 months ago

What changed: The stock decline intensified from 11% to 13%, establishing a historical record for the worst trading day in over two decades and quantifying the market cap loss at $31 billion.

IBM's stock is on track to record its worst monthly performance in 34 years, as selling pressure intensifies following a recent 13% single-day plunge—the company's steepest since 2000. This decline has wiped out approximately $31 billion in market value, driven by investor fears that Anthropic’s Claude AI model could disrupt IBM’s core legacy business in COBOL processing. As Claude demonstrates capabilities in automating the translation of legacy code, IBM's traditional service model faces significant obsolescence risks. This historic monthly downturn underscores deep-seated market anxiety regarding the vulnerability of established tech giants to generative AI disruption. Analysts highlight that the rapid pace of technological shifts has placed IBM under unprecedented pressure not seen in decades.