Buffett's $1.57B bet on UNH sparks a 12% surge, lifting peers despite sector headwinds and recent struggles at the insurer.

Berkshire Hathaway’s $1 billion homebuilding investment indicates Warren Buffett’s confidence in a future U.S. housing market rebound.

Warren Buffett's Berkshire Hathaway has acquired 5 million shares in UnitedHealth Group , a regulatory filing showed on Thursday, sending the health insurer's stock up 7% in extended trading.

The Omaha-based conglomerate bought more than 5 million shares in the health care firm for a stake worth about $1.6 billion at the end of June.

Berkshire Hathaway revealed four new investments Thursday in steelmaker Nucor, insurer UnitedHealth and two of the nation’s biggest homebuilders — Lennar and DR Horton — but only one of the investments was big enough to ensure that legendary investor Warren Buffett may have handled them.

This investment signifies Buffett's re-entry into UNH after liquidating his entire position back in 2010, indicating that he perceives significant value at

UnitedHealth was a star stock late last week, when it was revealed that Warren Buffett's Berkshire Hathaway had taken a $1.6 billion stake in the company's equity. On Monday, lingering positive sentiment on UnitedHealth was boosted by that price target bump.

On Friday, high-profile investors Michael Burry and Warren Buffett took positions in UnitedHealth Group Inc. (NYSE:UNH). Warren Buffett's fund bought little more than 5 million shares, and Burry disclosed in 13F filings that he purchased call contracts against 350,