The downturn was primarily fueled by Anthropic, which unveiled an AI-powered legal-review automation tool designed for its Claude chatbot. The move signals a direct challenge to the high-margin legal contract-review and workflow-software segments that have long anchored the valuation of Thomson Reuters. Traders responded by aggressively selling off shares, betting that the Silicon Valley startup could rapidly erode the competitive moat of established data providers.

AI Encroachment on Professional Workflows

The ripple effects extended across the specialty publishing landscape. Companies that rely on proprietary data and academic content faced significant selling pressure, with shares of Pearson, John Wiley, and News Corp falling sharply. Market analysts suggest that the ease with which generative AI can now parse and summarize complex documents threatens the traditional subscription models of these legacy media firms.

Separately, Disney shares saw a decline following the announcement of a definitive succession plan. The entertainment giant confirmed that Josh D’Amaro, currently head of the theme-parks division, will succeed Bob Iger as Chief Executive in March. While the news provides clarity on Disney’s long-term leadership, investors appeared cautious about the transition during a period of ongoing volatility in the streaming and linear television markets.