The investment seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the Wells Fargo® Hybrid and Preferred Securities ex Financials Index (the "Preferred Securities Index"). The fund normally invests at least 80% of its total assets in securities that comprise the fund's benchmark index. The Preferred Securities Index is comprised of convertible or exchangeable and non-convertible preferred securities listed on U.S. exchanges. The fund is non-diversified.