First Trust Nasdaq Transportation ETF(NASDAQ:FTXR)

FTXR holds a concentrated basket of liquid companies in the US transportation segment. The fund selects the 30 most liquid transportation stocks, including companies involved in delivery, shipping and marine transportation, railroads, trucking companies, airports and airlines, bridges and tunnels, and automobiles and auto parts. The selected stocks are then ranked and weighted on three different factors: 1) strong growth, as exhibited by 3-, 6-, 9-, and 12-month average price returns, 2) attractive value, evaluated by cash-flow-to-price, and 3) low volatility, based on historical price fluctuations. No single constituent can hold more than 8% of the total holdings. The index is reconstituted annually and rebalanced quarterly.