Thomson Reuters shares plunge as AI fears fuel selloff in software, data and advertising stocks
A selloff in European and North American software, data analytics and advertising stocks deepened on Tuesday after new artificial intelligence models raised concerns over the potential impact on sectors once seen as AI beneficiaries.
One catalyst was the launch of Anthropic’s legal plug-in for its Claude generative AI chatbot, according to traders and analysts.
The move sent Britain’s RELX and the Netherlands’ Wolters Kluwer, both providers of legal analytics services, down as much as 17 per cent and 13 per cent respectively. Toronto-based Thomson Reuters (TRI-T, TRI-Q), which owns the Westlaw legal database, fell over 14 per cent.
“The software companies were assumed to be winners from AI,” said Lars Skovgaard, senior investment strategist at Danske Bank. “But all of a sudden, you start to worry about whether you can earn the money back (from your AI investments), and/or will you be outsmarted by updates coming in.”
RELX shares have now almost halved from their peak last February and on Tuesday were set for their biggest drop since 1988. Its dramatic reversal highlights the pressure AI is exerting on Europe’s software sector.
Germany’s SAP, which less than a year ago was Europe’s most valuable company, slumped over 16 per cent last week after its cloud revenue forecast missed expectations, wiping about US$40-billion off its market value in one day. Its shares were down 4.9 per cent on Tuesday and more than 41 per cent below 2025’s high.
“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.
U.S. software and cloud computing stocks also fell. Microsoft (MSFT-Q) and Oracle (ORCL-N) were down 2 per cent and 3 per cent respectively. Salesforce (CRM-N), ServiceNow (NOW-N) and Photoshop maker Adobe (ADBE-Q) all fell over 5 per cent in early trading.
Other professional services firms were also sharply lower. In London, Experian, Sage Group, London Stock Exchange Group and Pearson fell between 4 per cent and 10 per cent. Traders and analysts said fear often outweighed company fundamentals.
Advertising companies were also under pressure. France’s Publicis shares dived over 9 per cent after the company’s results, while U.S.-based Omnicom slumped nearly 6 per cent.
Publicis, the world’s largest advertising group by market capitalization, said it had earmarked approximately 900 million euros (US$1.06-billion) for acquisitions in 2026, focusing on AI-powered technologies and data assets.
According to a Barclays survey of buy-side investors published on Monday, advertising agencies are seen as the most exposed part of European media to artificial intelligence, with WPP, Omnicom and Publicis ranked the top “AI losers”.
Analysts at the bank said companies could most effectively shake off an “AI loser” label by launching and clearly promoting revenue-generating AI products.
Other firms that rely heavily on advertising were also hammered, with Pinterest slipping 4 per cent and Snap falling more than 5 per cent. Ad-dependent Big Tech companies Meta and Alphabet’s Google, however, were down only marginally.
