iShares U.S. Regional Banks ETF(AMEX:IAT)

IAT specifically targets small- and mid-cap regional banks, creating a portfolio with a significant small-cap tilt compared to the broader banking market. Like the sector itself, this fund is extremely concentrated. IAT's underlying index selects from the small and midsize stocks of the Dow Jones U.S. Bank Index: It excludes mega-caps such as JP Morgan and Wells Fargo from the get-go. A company is also excluded if its three-year average total assets account for more than 5% of the three-year average total assets of the index selection universe. This size caveat aside, IAT offers market-like exposure as nearly all of its holdings overlap with our neutral benchmark. The index is market cap-weighted and is rebalanced quarterly.