Trailing 12-month profit statistics:
UnitedHealth Group (UNH) - $3.49 billion (B) on revenue of $84.27 B for a profit margin of 4.14%
Humana (HUM) - $0.85 B on $30.25 B for 2.79%
Wellpoint (WLP) - $2.43 B on $60.59 B for 4.00%
Cigna (CI) - $0.60 B on $18.93 B for 3.20%
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Wait it gets better. The health plans rank 88th for profitability, behind such profit generators as Specialty Eateries - Source Yahoo Finance.