The multiday retreat in highflying technology stocks reflects jitters ahead of Federal Reserve Chair Jerome Powell's scheduled speech in Jackson Hole, Wyo., on Friday, said Peter Cardillo, chief market economist at Spartan Capital Securities.

The U.S. dollar was little changed on Wednesday as traders awaited a speech from Federal Reserve Chair Jerome Powell at the annual Jackson Hole symposium later this week for clues on the monetary policy path.

Key Takeaways Federal Reserve officials and their global colleagues often deliver remarks at the Jackson Hole Symposium that have implications for interest rates.Federal Reserve Chair Jerome Powell’s speech on Friday will command attention,