Methodology: Advisors on the Top NextGen Independent Broker/Dealer Advisors list are ranked exclusively by total assets under management. To be eligible, advisors had to be under the age of 40 as of Jan. 1, 2015. We solicited nominations from the top 30 IBDs by headcount, sourced from Cerulli Associates. These are the firms that responded. REP. magazine and WealthManagement.com do not receive any compensation from financial advisors, participating firms and affiliates, or the media in exchange for rankings.