The Dow Jones industrial average and the broad S&P 500 index fell 0.1 percent while the tech-heavy Nasdaq composite index lost 0.2 percent - the fifth consecutive red day for the latter.
Chip stocks fell after media reports that the IPO of OpenAI was being postponed until next year. Micron fell 6.7 percent, SanDisk 10.5 percent and Intel 3.5 percent.
At the same time, the pharmaceutical sector was a major driving force in the market after the European Medicines Agency gave positive signals for several drugs, including those from Eli Lilly. Eli Lilly rose 7.1 percent.
