IBM Analysis: Anthropic's COBOL Bombshell Erases $30 Billion
International Business Machines Corporation (NYSE: IBM) is in the throes of its worst single-day selloff in over two decades. On February 24, 2026, shares plunged 13.1% to $223.35 after AI startup Anthropic announced that its Claude Code tool can analyze, document, and modernize legacy COBOL codebases — the decades-old programming language that still underpins much of IBM's enterprise consulting and infrastructure business. The move wiped roughly $30 billion from IBM's market capitalization in a single session, sending the stock to $223.35 from a previous close of $257.16. The panic is not without context. IBM had been on a remarkable run prior to this shock, climbing to a 52-week high of $324.90 on the strength of its own AI narrative — watsonx, hybrid cloud growth, and a string of solid quarterly earnings that saw full-year 2025 revenue reach $67.5 billion with $11.6 billion in free cash flow. The company had positioned itself as a primary enterprise AI beneficiary, not a casualty. Yet Anthropic's demonstration that AI can compress legacy modernization timelines from months to hours has forced investors to reconsider whether IBM's most durable competitive moat — its grip on mission-critical legacy infrastructure — may be far more vulnerable than previously assumed. At $223.35, IBM now trades at roughly 20x trailing earnings, carries a 3.0% dividend yield, and sits 31% below its 52-week high. The question facing investors is clear: is this a generational buying opportunity in a $209 billion enterprise technology franchise, or an early warning that AI disruption is coming for Big Blue's core revenue streams faster than anyone expected?