US and European stock markets retreated on Wednesday as investors eagerly awaited results from artificial-intelligence giant Nvidia. Many investors see the company as a bellwether for the tech sector and artificial-intelligence demand that have helped power Wall Street to multiple record-highs this year.

US and European stock markets retreated on Wednesday as investors eagerly awaited results from artificial-intelligence giant Nvidia. Many investors see the company as a bellwether for the tech sector and artificial-intelligence demand that have helped power Wall Street to multiple record-highs this year.

Nvidia is set to deliver its highly anticipated earnings after the closing bell Wednesday, with analysts overwhelmingly bullish on the chipmaker's stock.