AI Automation Fears Trigger Massive Selloff in Legal, Data and Software Stocks
Fears of artificial intelligence-driven disruption sparked a brutal selloff across US and European software, data analytics and professional services companies on Tuesday, with investors pointing to newly launched AI automation tools from Anthropic as the primary catalyst for the market turmoil.
Anthropic's Claude Cowork Plug-ins Spark Industry Concerns
AI developer Anthropic launched plug-ins for its Claude Cowork agent on Friday that automate tasks across legal, sales, marketing and data analysis domains. This move has ignited widespread concerns about an impending AI-fueled disruption of the data and professional services industry, sectors that were previously viewed as major beneficiaries of the AI era according to traders and market analysts.
The market reaction was swift and severe, with Toronto-based Thomson Reuters, which owns the Westlaw legal database, slumping by nearly 18 percent. The company is on track for its biggest daily loss on record and its lowest closing price since June 2021.
"I think Anthropic came out with some plug-ins to tackle the legal space," said Mike Archibald, a portfolio manager at AGF Investments in Toronto. "Obviously, that's where Thomson Reuters generates a good chunk of their revenues. Sometimes the market just shoots first and asks questions later."
Legal and Data Analytics Firms Bear the Brunt
The selloff extended across multiple companies in the legal and data analytics space:
- Britain's RELX and the Netherlands' Wolters Kluwer, both providers of legal analytics services, fell 14 percent and approximately 13 percent respectively
- RELX shares have now almost halved from their peak last February and were set for their biggest drop since 1988
- Factset Research declined 9 percent while Morningstar lost 8 percent
- LegalZoom slumped 19.2 percent during the trading session
Thomson Reuters, which is also the parent company of Reuters News, is scheduled to report its fourth quarter earnings results on Thursday. Its shares are now down 33 percent year-to-date after dropping about 22 percent in 2025.
Analysts Point to Structural Industry Shifts
Market analysts highlighted that investor fears often outweighed company fundamentals during the selloff. "The selling pressure in software and data analytics reflects a deepening structural debate, accelerated today by Anthropic's legal automation tool challenging incumbents like RELX," said Schroders analyst Jonathan McMullan.
"Investors are aggressively repricing these areas as the historical 'visibility premium' erodes; the speed of AI advancement makes long-term valuations harder to defend, particularly as AI tools allow businesses to do more with fewer staff, threatening the traditional model of charging per software user."
Morgan Stanley analysts led by Toni Kaplan wrote in an investor note: "Most of the investors we have spoken with recently are overwhelmingly bearish on TRI as the consensus opinion worries that the company will be unable to maintain the same level of growth within its legal segment given increased competition from specialized AI tools."
Broader Market Impact and Advertising Sector Pressure
The selloff extended beyond legal and data analytics firms to include other professional services companies and advertising firms:
- In London, Experian, Sage Group, London Stock Exchange Group and Pearson fell between 6 percent and 12 percent
- New York-based Omnicom dropped nearly 10 percent while France's Publicis shares dived over 9 percent
- Pinterest dropped 8 percent and Snap fell more than 8 percent
Publicis, the world's largest advertising group by market capitalization, said it had earmarked approximately 900 million euros ($1.06 billion) for acquisitions in 2026, focusing on AI-powered technologies and data assets.
"Artificial intelligence is increasingly able to perform exactly the sort of programming and knowledge-based services that underpin these business models, so parts of the sector have been under pressure for some time," said Giuseppe Sersale, fund manager at Anthilia.
Technology Sector Also Affected
Most large-cap U.S. technology stocks were also trading lower during the session:
- Nvidia was down 3.6 percent
- Meta Platforms shed 2.3 percent
- Microsoft dropped 3 percent
- Oracle was down 4 percent
The benchmark S&P 500 was down 1.4 percent while the Nasdaq fell 2.1 percent on the session, reflecting broader market concerns about AI's disruptive potential across multiple industries.
The dramatic market reversal highlights the significant pressure AI advancements are exerting on Europe's software sector and professional services industries globally, as investors reassess traditional business models in light of accelerating automation capabilities.
