(Bloomberg)—Billionaire Ken Griffin is reaching a tipping point with Chicago, the home to his market maker and hedge fund business, as the city wrestles with rising crime. “We’re getting to the point that if things don’t change, we’re gone,” Griffin, who runs both the hedge fund Citadel and the market-making business Citadel Securities, said Thursday in an interview. “Things aren’t changing.”  Griffin’s businesses currently count South Dearborn Street in Chicago as its headquarters, just a few blocks from the Willis Tower and close to Millennium Park.