Berkshire Hathaway invests $1.57B in UnitedHealth (UNH), boosting shares by 10.5%. Discover key insights on its challenges, outlook, and analyst ratings.

Buffett's vote of confidence comes as UnitedHealth faces a challenging year. The stock had fallen nearly 50% through Thursday, weighed down by rising healthcare costs, a Justice Department investigation into Medicare billing practices,

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.