Bloomberg journalists discuss today's biggest winners and losers in the stock market. Listen for analysis on the companies making news on Wall Street.

Here are some of the stocks making notable moves in Friday's premarket action: UnitedHealth shares are jumping more than 10% after Warren Buffett's Berkshire Hathaway said in a filing it had [built a

Key Takeaways U.S. equities were mixed at midday following the release of the July retail sales report, which came in as expected.UnitedHealth Group lifted the entire insurance sector after Warren Buffett's Berkshire Hathaway reported it held 5 million shares in its portfolio.