Penn has 26 graduates on the list plus a post-doc fellow who will be coming to Penn soon as a professor. This places Penn as the fifth most represented school on the list. The top 5 schools from most to least represented are:
Harvard Stanford Columbia MIT Penn
http://www.thedp.com/article/2017/11/forebes-30-under-30-upenn-philadelphia-graduates-achievement-wharton-ivy
https://www.forbes.com/sites/carolinehoward/2017/11/14/30-under-30-class-of-2018-the-young-stars-visionaries-and-creative-disruptors/#33b88a22f4ae