Artificial intelligence is advancing faster than many investors expected — and markets are beginning to feel the consequences.
A sudden wave of selling swept through technology, data analytics, and advertising companies across the U.S. and Europe after AI company Anthropic released new automation tools for its Claude Cowork assistant. These tools can now perform complex tasks in areas such as legal research, marketing strategy, sales operations, and data processing.
What was once viewed as a productivity boost is now being seen as a direct threat to entire business sectors.
The AI Update That Triggered Market Panic
Anthropic’s latest rollout introduced plug-ins that allow its AI system to take on professional work traditionally handled by humans and specialized software platforms.
This sparked concern among investors that companies relying on subscription services and human-driven workflows may soon struggle to compete with faster, lower-cost AI alternatives.
As confidence weakened, stocks across the professional services industry began to tumble.
Thomson Reuters Faces Its Steepest Daily Decline Ever
One of the most dramatic drops came from Thomson Reuters, whose share price fell nearly 18% in a single trading session — the largest one-day loss in the company’s history.
Much of the pressure centers on its legal research business, particularly the Westlaw platform, which could face increasing competition from AI-powered legal tools.
With fears growing over long-term revenue stability, the stock has now fallen sharply for the year.
European Information Firms Hit Hard by AI Concerns
The selloff quickly crossed the Atlantic.
Major European providers of legal and business data experienced heavy losses:
RELX slid roughly 14%, while Wolters Kluwer dropped close to 13%. RELX has now lost almost half its market value compared to last year’s peak — one of its worst declines in decades.
Market analysts say investors are rapidly reassessing how much traditional software companies can charge in a world where AI performs similar work instantly.
Advertising and Financial Research Companies Join the Decline
The pressure extended well beyond legal services.
FactSet saw its stock sink by more than 10%, Morningstar dropped about 9%, and LegalZoom plunged nearly 20%.
In the UK, shares of Experian, Sage Group, London Stock Exchange Group, and Pearson also fell sharply.
The common fear driving these declines is that AI will dramatically reduce the need for expensive subscriptions and large professional teams.
Major Tech Stocks Feel the Ripple Effect
The broader technology sector also moved lower.
Nvidia, Microsoft, Meta, and Oracle all posted losses, while major indexes like the S&P 500 and Nasdaq closed the day in negative territory.
The market response highlights how deeply AI disruption is now influencing investor sentiment.
Why This Moment Signals a Bigger Shift
For years, AI was seen as a tool to enhance existing business models. Now, it’s beginning to replace entire processes.
Today’s AI can:
- Review legal documents in seconds
- Automate marketing workflows
- Analyze massive data sets instantly
- Reduce reliance on human labor
This creates serious challenges for companies built around manual services and per-user pricing models.
Investors are increasingly concerned not about if disruption will happen — but how quickly.
What Investors Should Watch Next
While panic selling may slow, the transformation underway is real.
Companies that adapt by integrating AI deeply into their products could thrive. Those that resist may see continued pressure on growth and valuations.
The coming months will reveal which businesses can evolve in this new AI-driven environment.
Final Takeaway
Anthropic’s AI breakthrough has become a wake-up call for markets.
The sharp declines in software, advertising, and professional services stocks show growing recognition that artificial intelligence is reshaping industries faster than anyone anticipated.
Whether this selloff proves temporary or marks the beginning of a long-term shift, one fact is now clear:
AI is no longer just improving work — it’s replacing it.