Beaten-down UNH is set to challenge its 50-day moving average after a major vote of confidence from the Oracle of Omaha.

Shares of UnitedHealth Group Inc. (NYSE: UNH) climbed 2.81% in Monday's pre-market trading session, extending Friday's gain following Michael Burry and Warren Buffett's stake acquisition in the insurance behemoth.

Shares of UnitedHealth Group surged nearly 14% on Friday after billionaire Warren Buffett's Berkshire Hathaway bought 5 million shares of the company, providing a shot in the arm for investors who think the health conglomerate will turn around under its new CEO.

The company may be under criminal investigation for alleged irregularities in its Medicare business—but it's been touched by the Warren Buffett effect.

Warren Buffett's Berkshire Hathaway built a $1.6 billion stake in UnitedHealth last quarter, marking one of its last wagers with the investor as CEO.

UnitedHealth Group shares popped Friday after Berkshire Hathaway announced it purchased 5 million shares of the insurance giant.

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

Berkshire Hathaway's $1B+ UnitedHealth investment highlights confidence despite profit woes. Read why UNH offers attractive upside for long-term investors.

Warren Buffett, Michael Burry and Andrew Left may not always agree on which stocks have good valuations. The three are all long UnitedHealth stock.

Futures for the Dow Jones Industrial Average and other major stock indexes traded sharply mixed Friday as Wall Street reacted to the U.S. retail sales report. Meanwhile, UnitedHealth GroupUNH soared on the stock market today after famed investor Warren Buffett disclosed a new position.