At least 139 of the Forbes 400 are Jewish (jta.org)

15.8% of the Forbes 400, but only 1.7-2.6% of the US (https://en.wikipedia.org/wiki/American_Jews). On the other hand, 62% of Forbes 400 is white, compared to 58% of the US (https://gawker.com/5645917/the-forbes-400-a-demographic-brea...).