These stocks are in focus before the bell on Friday. Check out our trending tickers page for more movers.

UnitedHealth (UNH): The health insurer’s stock turned higher, up about 3%, on the heels of Thursday’s 11% tumble. Investors are assessing its prospects as it reportedly faces a DOJ criminal probe and grapples with an abrupt change in CEO

Applied Materials (AMAT): The chipmaking equipment maker’s second quarter revenue missed estimates as sales in China faced US export curbs. Its stock slid roughly 6%.

Take-Two Interactive (TTWO): Shares in the games maker slipped 2%. While its fourth quarter revenue beat estimates, its full-year earnings forecast fell short amid a delay to “Grand Theft Auto VI”.

Constellation Brands (STZ): The drinks company’s stock rose over 3% after Warren Buffett’s Berkshire Hathaway (BRK-B, BRK-A) said it had more than doubled its stake in the maker of Corona beer and Robert Mondavi wines. Berkshire also exited its stake in Citi (C) and cut its holdings in Bank of America (BAC), but those stocks were little changed early on Friday morning.