Northern Trust, an investment management firm with 17,800 employees, takes the top spot. The 128-year-old, Chicago-based company continuously delivers “widespread Diversity at Work training,” according to its website. Among Northern Trust’s top executives, women make up 38%, a level significantly higher than the 27% observed among S&P 500 companies. African-Americans make up 23% of the board. “We seek an inclusive environment where our unique mix of attributes and diversity of perspectives can serve as catalysts for innovation,” says Northern Trust CEO Michael O’Grady.