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 Oil Services ETF (OIH), which added 4,050,000 shares, or a 12.4% increase week over week. Among the largest underlying components of OIH, in morning trading today Schlumberger Ltd (SLB) is up about 0.1%, and Halliburton Company (HAL) is higher by about 0.8%.