While the Dow Jones average has increased an impressive 253 percent since March 5, 2009, Humana’s share price is up a truly remarkable 1010 percent. No, that’s not a typo. Cigna’s share price has done even better. It’s up 1113 percent. That’s more than four times better than the Dow. The other big companies aren’t far behind. Anthem is up 469 percent. Aetna is up 628 percent. And UnitedHealth Group is up 814 percent.