FTXN invests in a concentrated basket of liquid US oil and gas companies. It picks the 50 most liquid stocks in the segment, which includes companies involved in exploration, production, drilling, distribution, and sales of oil and gas products. 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.