Comparing units outstanding versus one week ago at the coverage universe of ETFs at ETF Channel, the biggest inflow was seen in the iShares Russell Mid-Cap Growth ETF (IWP), which added 13,800,000 units, or a 19.8% increase week over week. Among the largest underlying components of IWP, in morning trading today Zoetis (ZTS) is up about 0.1%, and Illumina (ILMN) is lower by about 0.7%.