By Todd Rosenbluth, CFRA Key Takeaways ProShares Online Retail ETF (ONLN) earns a top CFRA rating for the ETF’s record and appealing holdings. While the fund’s top-10 holdings comprise more than 70% of assets, CFRA finds Amazon.com (AMZN), eBay (EBAY), JD.com (JD) and Wayfair (W) to be attractively...