U.S. and European software stocks struggled to find support Wednesday as a sector-wide selloff spread to Asia, fueled by mounting worries that advances in artificial intelligence could upend companies' business models.

European data analytics, professional services and software stocks fell for a second day in volatile trade, mirroring losses in global peers, after Anthropic's new legal artificial intelligence model underscored the threat to businesses seen as most exposed to AI disruption.

Britain's RELX and the Netherlands' Wolters Kluwer — major providers of analytics to the legal industry — dropped about 3% in morning trade before paring some losses, after plunging more than 14% and 12% respectively on Tuesday.

Shares of U.S. software and services firms were mixed in premarket trading after a near 13% slide over five straight sessions. Nasdaq-listed Thomson Reuters, the parent company of Reuters News, was flat in light volume after Tuesday's record 16% slump on fears that AI could threaten its core legal division.

London Stock Exchange Group slid as much as 6.9%, extending Tuesday's near 13% drop.

Indian IT exporters also fell sharply, while Japanese software and systems developers NEC, Nomura Research and Fujitsu sank between 8% and 11%, dragging the Nikkei benchmark index lower overnight.

The rout comes amid wider concern that a tech bubble could burst, posing financial stability risks.

JP Morgan analyst Toby Ogg said investors were focused on long-term growth questions that stretch far beyond traditional three-year forecasts.

"The sector isn't just guilty until proven innocent, but is now being sentenced before trial," he said.

"Our sense from investor discussions is that general appetite to step in remains generally low," he added, citing risks including competition from AI-native firms and clients building their own solutions in-house.

ANTHROPIC SPARKS SELLOFF

One trigger for Tuesday's selloff was Anthropic's launch of plug-ins for its Claude Cowork agent on Friday, enabling automated tasks across legal, sales, marketing and data analysis.

Advertising stocks — viewed as among the most exposed in European media to AI — also stayed under pressure. France’s Publicis was last down 3.6% and Britain's WPP lost 3%, both hitting new lows.

Shares in SAP, Europe's largest software company, dropped more than 3%, a week after a disappointing cloud revenue forecast wiped around $40 billion off its market value.

With stellar gains in chipmaker Nvidia and so-called AI hyperscalers like Microsoft pushing U.S. stocks to record highs, regulators and policymakers — including the International Monetary Fund and the Bank of England — have warned of the risks of a potential bubble.

"All innovation means there is going to be disruption at some point, and we appear to be at a significant point in that journey for software and IT services companies," said Ben Barringer, head of technology research at Quilter Cheviot.

"There is a lot of uncertainty around exactly what AI agents can do, and as such, investors are choosing to shun the software market altogether, leaving nowhere to hide."

Salesforce, CrowdStrike, Adobe each dipped about 0.2% in U.S. premarket trading, while Intuit eased 0.6%. Atlassian Corp firmed 0.6%.