Oil And Food Speculators Demand Special Tax Cut From Gov. Pat Quinn | The CME Group, the world’s largest operator of commodity exchanges, is threatening to leave Illinois unless the company receives a special exemption from a new corporate tax rate. The corporate tax was temporarily increased in Illinois to combat that state’s budget shortfall. Gov. Pat Quinn (D-IL) is currently in negotiations with CME Group executives, while Mayor Rahm Emanuel, a former CME Group board member, has told reporters that he is “confident the company will remain in Chicago.” The CME Group posted a 22 percent gain in profits from the first quarter this year.