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 Materials Select Sector SPDR Fund (XLB), which added 7,250,000 shares, or a 12.9% increase week over week. And on a percentage change basis, the ETF with the largest increase in inflows was the Retail ETF (RTH), which added 250,000 shares, for a whopping 47.9% increase in outstanding shares.