Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, the largest inflow was seen in the iShares Gold Trust (IAU), which added 4,500,000 shares, or a 0.6% increase week over week. And on a percentage change basis, the ETF with the largest increase in inflows was the Proshares Ultra 20+ Year Treasury (UBT), which added 100,000 shares, for a whopping 50.0% increase in outstanding shares.