NEW YORK--(BUSINESS WIRE)--E*TRADE Financial Corporation (NASDAQ: ETFC) today announced it topped $50 billion in retirement assets under management as of the end of May 2015. Retirement assets have more than doubled since May 2010 — up from $24 billion — as investors increasingly turn to E*TRADE to take control of their retirement, investing, and savings. In the first quarter of this year, roughly one-fourth of net new assets were in retirement accounts. Assets in managed accounts reached $3.2