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 2000 ETF (IWM), which added 12,800,000 units, or a 4.7% increase week over week. Among the largest underlying components of IWM, in morning trading today Nektar Therapeutics (NKTR) is up about 0.7%, and Grubhub (GRUB) is lower by about 0.3%.