The investment seeks to track the price and yield performance, before fees and expenses, of the Cboe Russell 2000 PutWrite Index (the "index"). Normally at least 80% of the fund's total assets (exclusive of collateral held from securities lending) will be invested in component securities of the index and investments that have economic characteristics that are substantially identical to the economic characteristics of such component securities. The index tracks the value of a cash-secured put option sales strategy, which consists of selling Russell 2000 Index put options and investing the sale proceeds in one-month Treasury bills. The fund is non-diversified.