Financials Buffett would find appealing UnitedHealth Group's share price has plunged more than 50% this year. The company delivered lower-than-expected results in the first quarter.

UnitedHealth Group's ROE over the past 12 months was 22.7%. Despite its disappointing Q1 results, UnitedHealth Group's revenue still grew $9.8 billion year over year to $109.6 billion.