Investors looked for reasons to take profits in the stock market today, and an earnings outlook warning from retailing giant Walmart appeared to supply one excuse to sell. Major indexes fell sharply in morning trading but China-based companies rallied en masse following results from another retailing giant,

U.S. stocks open lower, with the S&P 500 off Wednesday's record high. Walmart's weaker outlook and tariff uncertainty weigh on sentiment. Gold rises.