Turning today to week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, the largest outflow was seen in the Proshares Ultra MidCap400 (MVV), which shed 1,425,000 shares, or a 48.7% decrease week over week. Among the largest underlying components of MVV, in morning trading today Aarons Incorporated (AAN) is up about 1.1%, and Aci Worldwide Incorporated (ACIW) is higher by about 0.5%.