These changes shook up the industry. The old generation of trade schools gradually died off and were replaced by a new breed of for-profit colleges—mostly huge, publicly traded corporations. The largest, the Apollo Group, owns the University of Phoenix, which serves more than 400,000 students at some ninety campuses and 150 learning centers worldwide. Others include the Career Education Corporation, which serves 90,000 students at seventy-five campuses around the world, and Corinthian Colleges, which serves 69,000 students at more than 100 colleges in the United States and Canada