IWB offers exposure to a generously-defined large-cap market in a large, liquid, and low-cost wrapper. The fund`s largest 1,000 names selection methodology extends into the midcap space as we see it. In contrast, our benchmark has about 300 stocks. This broader portfolio slightly lowers concentration risk while slightly increasing market risk. But for allocators, defining the ideal large-cap boundary is less important than avoiding coverage gaps or overlaps when combining funds in a portfolio. If the Russell 1000 meets your large-cap needs, IWB gets it done nicely.