Nvidia (NASDAQ: NVDA) stock is heading lower in Tuesday's trading. The company's share price was down 1% as of 1 p.m. ET against the backdrop of a 0.5% decline for the S&P 500 index and a 1.1% decline for the Nasdaq Composite index.

What happens with Nvidia matters for the entire U.S. stock market. The chip company has grown into the second-largest company on Wall Street, which means the stock’s movement carries more weight on the S&P 500 and other indexes than every company except Apple. The tech giant, based in Santa Clara, California, is now worth over $3 trillion.