The first half rally in small caps doesn’t appear to be running out of steam, which could mean more strength in the second half with exchange-traded funds (ETFs) like the Invesco S&P SmallCap 600 Revenue ETF (RWJ) . RWJ, which is up over 40% so far in 2021, seeks to track the investment results of the S&P SmallCap 600 Revenue-Weighted Index.








