Stock futures are pointing to a mixed open for major U.S. indexes on Friday as a sharp decline in shares of United Health Group is set to weigh heavily on the Dow Jones Industrial Average.

Investors eye Walmart's disappointing guidance. Live updates on stocks and other markets, including the Dow Jones Industrial Average, S&P 500 and Nasdaq Composite.

Wall Street retreated from its record after a sharp slide for Walmart weighed on U.S. stock indexes. The S&P 500 fell 0.4% Thursday after setting all-time highs in each of the last two days. The Dow ...