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

With U.S. stock markets set to open in two hours, UnitedHealth Group Inc. (UNH) was up 11.0% in pre-market trading, and Nu Holdings Ltd. Cl A (NU) was up 10.4%.

UnitedHealth jumps after Berkshire Hathaway discloses a stake in the health insurer, while Applied Materials tumbles ...

To make sense of this complicated time — and to look ahead to next week's Jackson Hole conference — we speak with Skanda Amarnath, the executive director of Employ America.