NEW YORK (AP) — An early swoon shook the U.S. stock market on Friday, as Nvidia , bitcoin, gold and other high flyers swung on what's become an increasingly antsy Wall Street, but it quickly calmed.

After starting the day with a sharp drop of 1.3%, the S&P 500 erased all of it and was up by 0.4%, with an hour remaining in trading. The Nasdaq composite also flipped to a gain of 0.6%, while the Dow Jones Industrial Average trimmed its loss to 163 points, or 0.3%, after earlier being down nearly 600 points.

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