Wall Street is sliding toward losses in premarket trading after Walmart, the nation’s biggest retailer and a bellwether for the health of the American consumer, gave a disappointing 2025 forecast.

Collectively, about 6,000 companies are listed on the New York Stock Exchange and the Nasdaq Exchange, according to the Securities Industry and Financial Markets Association (SIFMA). Many of those companies are grouped into major indexes that measure various aspects the domestic market.