First Trust DJ Select MicroCap ETF(AMEX:FDM)

FDM calls itself a micro-cap fund, and for the most part it is, but the fund leans hard toward the small-cap space. FDM's underlying index is market-cap weighted and screens for financial strength, looking at metrics like trailing P/E and P/B. Sector biases result, investors should verify sector weightings. The index and fund are reconstituted annually and rebalanced quarterly. FDM captures a segment that is difficult to reach and uses a full replication index strategy. Comparatively, these aspects tend to increase management expenses.