Options traders Steven Rodriguez, left, and Marty Handler work on the floor of the New York Stock Exchange on June 3. (AP Photo/Richard Drew)

NEW YORK (AP) — Another sell-off for artificial-intelligence stocks helped drag the U.S. market sharply lower Wednesday, as Wall Street’s former superstars continue to face heavy scrutiny for their success.

The S&P 500 dropped 1.6% for its first back-to-back drop in three weeks and is back to where it was in early May. The Dow Jones Industrial Average tumbled 953 points, or 1.9%, and the Nasdaq composite led the market lower with a 2% slide.

Wall Street has been shaky since last week, when AI stocks went from roaring to records to suddenly turning lower. Among the worries is that their prices have simply shot too high, too fast because of AI mania. The question now is whether the break lower has cleared out excessive optimism that may have built into their stock prices, or if it’s the start of a longer downturn.

Super Micro Computer, which sells AI servers, tumbled 28% after saying late Tuesday that it plans to raise $7 billion in cash by selling shares of stock and convertible preferred stock. Such moves raise the most money for companies when their stock prices are high, and they can dilute the ownership stakes of existing shareholders.

Micron Technology swung from an early loss of nearly 4% to a modest gain and back to a loss of 4.7%. It’s coming off a wild stretch where it sank 7.7% last Thursday, then plunged another 13.3% Friday and rallied 9.9% Monday. Despite all the swings, the computer memory maker’s stock is still up 212.5% for the year so far.

Nvidia, the chip company that’s grown into a nearly $4.9 trillion behemoth because of the AI boom, was the heaviest weight on the S&P 500 after falling 3.7%. The second-heaviest was another AI winner, Broadcom, which fell 5.1%.

Some of the pressure on AI stocks could also be coming from investors pulling cash out to prepare for high-profile debuts on the U.S. stock market for several AI giants. SpaceX’s initial public offering could come later this week, for example.

Traders have been building bets recently that the Fed will have to hike its main interest rate at least once this year, given how high inflation is and how strong the U.S. job market remains.

Wednesday’s inflation update didn’t sway them much, according to data from CME Group. Consumer prices rose 4.2% in May from a year earlier, the third straight monthly increase.

All told, the S&P 500 fell 119.66 points to 7,266.99. The Dow Jones Industrial Average dropped 953.33 to 49,918.78, and the Nasdaq composite sank 509.32 to 25,169.50.