Drops for Nvidia and other tech stocks are weighing on Wall Street Monday and keeping it in its weekslong rut. The S&P 500 was down 0.4% in morning trading, coming off its fourth losing week in the last five.

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The shares of IonQ Inc. and other companies linked to quantum computing tumbled in extended trading on Tuesday after Nvidia Corp. Chief Executive Officer Jensen Huang said “very useful” quantum computers are likely decades away.

Drops for Nvidia and other superstar stocks are dragging U.S. stock indexes lower on Monday and keeping Wall Street stuck in its weekslong rut. The S&P 500 fell 0.8% in early trading, coming off its fourth losing week in the last five.