US stocks have closed in negative territory, with a resumption of the week's earlier tech selloff as investors contended with mounting economic uncertainty and stretched valuations.

All three major US equity indexes lost ground as risk appetite was dampened by worries over inflated stock prices, particularly from artificial intelligence-related momentum shares.

AI-adjacent shares provided muscle to the rally in recent months that pushed the indexes to a series of record-setting highs, so weakness in the sector was a stark reminder of Wall Street's reliance on tech.

"Valuations are still very much a concern longer term, but (the market is) still bullish," said Paul Nolte, senior wealth adviser & market strategist at Murphy & Sylvest in Elmhurst, Illinois. "Earlier this week, we got a dra

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