Much was made recently about how UnitedHealth decided to drop out of the ACA Federal Exchange in several states. It is important to realize that far from being a failure to large insurers (UnitedHealth is the largest insurer in the US), health insurance remains extremely profitably under ObamaCare. Below is a bar chart of the percentage change in stock prices of the five largest publicly traded health insurers in the US from March 23, 2010 when the ACA was signed to today (6/6/2016).

Top Five Health Insurer Stock Prices under ObamaCare