Stock markets mostly retreated Friday as the prolonged US government shutdown dragged on investor sentiment, along with worries about an AI bubble dismissed by President Donald Trump.

Large tech names that have propelled major US equity indices to repeat records throughout 2025 were under pressure most of the day, although some big names inched into positive territory late in the session.

US stocks finished Friday's session mixed, with the Dow and S&P 500 narrowly positive, while the Nasdaq ended lower.

But equity markets have hit resistance in recent days amid concerns that stocks are overvalued and doubts over tens of billions of dollars in new AI investments that have been announced.

The worries include that "data centers might not be profitable in the near future." said Tom Cahill

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