A steep slide in shares of semiconductor companies was dragging on the Nasdaq Composite on Tuesday afternoon, putting the tech-heavy index on track for a rare underperformance versus the Dow Jones Industrial Average.

The Nasdaq and S&P 500 fell on Wednesday as investors sold tech stocks and moved into less highly valued sectors, as they also awaited remarks from Federal Reserve officials at their Jackson Hole symposium this week.

The Nasdaq fell as megacaps lost after having rallied for much of the year. Nvidia fell 3.5%, the biggest drop in nearly four months.