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

Year to date, the stock has fallen by nearly 45%, which is by no means normal for the healthcare stock. In fact, this is the worst it has performed since the Great Recession, when it tumbled by more than 54% in 2008.

UnitedHealth shares jumped 12 per cent on Friday after Warren Buffett’s Berkshire Hathaway snapped up a stake in the troubled US healthcare group.

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

America’s largest health insurance company had fallen nearly 63% from a 52-week high of $630.73 before Friday’s surge

UnitedHealth Group ( UNH 12.04%) has been a solid dividend growth stock for years. Generally, its yield has been fairly low, due to the stock's rising value. Even as the healthcare insurance giant has grown its dividend, its yield hasn't been particularly high or noteworthy.

Michael Burry and Warren Buffett invested in UnitedHealth, signaling confidence in its sector and potential for earnings recovery by 2027.

Here are some of the biggest premarket U.S. stock movers today: Palo Alto Networks (NASDAQ: PANW) stock rose 0.4%, with the cybersecurity firm expected to headline the slate of July-quarter returns after the closing bell.