Health care ETFs revived Thursday on a legal victory for ObamaCare. The largest exchange traded funds tracking the sector inched up a fraction. But iShares U.S. Health Provider (IHF) surged 3.2%, getting an additional boost from likely consolidation in the insurance industry. Top holding UnitedHealth Group (UNH) rose 2.65% on the stock market today. Other top holdings scored bigger gains:Aetna (AET) was up 3.99%.