Strategy. The Fund normally invests at least 90% of its total assets in the securities that comprise the Index. The Fund, using an indexing investment approach, attempts to replicate, before fees and expenses, the performance of the Index. The Funds investment sub -adviser , Penserra Capital Management LLC ( Penserra or the Sub -Adviser ) seeks a correlation of 0.95 or better (before fees and expenses) between the Funds performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. S&P Opco LLC (a subsidiary of S&P Dow Jones Indices, LLC) ( S&P or the Index Provider ) compiles, maintains and calculates the Index. The Fund is classified as a diversified company under the Investment Company Act … Show more… The Fund normally invests at least 90% of its total assets in the securities that comprise the Index. The Fund, using an indexing investment approach, attempts to replicate, before fees and expenses, the performance of the Index. The Funds investment sub -adviser , Penserra Capital Management LLC ( Penserra or the Sub -Adviser ) seeks a correlation of 0.95 or better (before fees and expenses) between the Funds performance and the performance of the Index; a figure of 1.00 would represent perfect correlation. S&P Opco LLC (a subsidiary of S&P Dow Jones Indices, LLC) ( S&P or the Index Provider ) compiles, maintains and calculates the Index. The Fund is classified as a diversified company under the Investment Company Act of 1940, as amended (the 1940 Act ). To the extent the Index concentrates ( i.e. , holds 25% or more of its total assets) in the securities of a particular industry or group of industries, the Fund will concentrate its investments to approximately the same extent. As of the date of this prospectus, the Fund is concentrated in the financials sector. The Index is composed of all preferred stocks that are constituents of the S&P U.S. Investment Grade Preferred Stock Index (the Base Index ). To be eligible for inclusion in the Base Index, a security must be considered investment grade, which are securities with a credit rating minimum of BBB-/Baa3/BBB- issued by S&P Global Ratings ( S&P Global ), Moodys Investors Service, Inc. ( Moodys ), and Fitch Ratings, Inc. ( Fitch ) respectively. The Index Provider performs the following eligibility screens for quality with respect to credit ratings: for an issue rated by all of S&P, Moodys and Fitch, the lowest of the three ratings is used as the issues credit rating; when there are two ratings, the lower of the two ratings must be considered investment grade; and when there is only one rating, that rating must be designated in the investment grade category by the applicable rating agency. While the Index is required to be comprised of securities that are investment grade at the time of investment, the ratings of the securities eligible for inclusion in the Index may be in the lowest tier investment grade rating, which provides for an indication of a higher risk of default than securities that maintain a higher investment grade rating. See Credit Ratings Risk for further information on the risks associated with credit ratings. In addition to the credit rating minimum, to be eligible for inclusion in the Index, a preferred security must exhibit minimum liquidity quality characteristics as determined by the Index Provider. With respect to liquidity, a preferred security eligible for inclusion in the Index, a security must be: listed on a qualifying U.S. securities exchange; have a total market capitalization of greater than or equal to $100 million and have traded more than 250,000 shares per month over each of the prior six months; and maintain a market capitalization of $75 million and have traded more than 125,000 shares per month over each of the prior six months in order to remain eligible in the Index. Preferred stocks for which the Index Provider cannot determine an indicated dividend yield are not eligible for inclusion. Once eligible securities have been selected for inclusion in the Index, the Index seeks to mitigate issuer concentration risk by assigning an equal weight to each issuer represented by the selected securities; however, the mitigation of issuer concentration risk is not guaranteed. That weight is then equally distributed among component securities of the issuer that are eligible for the Index. The Index is rebalanced quarterly. In connection with the Indexs methodology to invest in preferred securities, the Index, and therefore the Fund, currently has exposure to preferred securities issued by real estate investment trusts ( REITs ). REITs are financial vehicles that pool investors capital to invest primarily in income -producing real estate or real estate -related loans or interests. The Index does not limit the types of REITs eligible for inclusion in the Index, which are generally categorized as Mortgage REITs, which invest the majority of their assets in real estate mortgages and derive their income primarily from interest payments, Equity REITs, which invest the majority of their assets directly in real property and derive their income primarily from rents, royalties and lease payments, and Hybrid REITs, which combine the characteristics of both Mortgage REITs and Equity REITs. As of the date of this prospectus, the Fund has exposure to preferred securities issued by Equity REITs. Show less