Strategy. The Fund employs a passive management or indexing investment approach designed to track the performance of the Index. The Fund generally uses a representative sampling strategy to achieve its investment objective, meaning it generally will invest in a sample of the securities in the Index whose risk, return, and other characteristics resemble the risk, return, and other characteristics of the Index as a whole. Under normal circumstances, at least 80% of the Funds total assets (exclusive of collateral held from securities lending) will be invested in the constituent securities of the Index and investments that have economic characteristics that are substantially identical to the economic characteristics of such constituent securities. Bloomberg Index Services Limited (the Index Provider), designed the Index … Show more… The Fund employs a passive management or indexing investment approach designed to track the performance of the Index. The Fund generally uses a representative sampling strategy to achieve its investment objective, meaning it generally will invest in a sample of the securities in the Index whose risk, return, and other characteristics resemble the risk, return, and other characteristics of the Index as a whole. Under normal circumstances, at least 80% of the Funds total assets (exclusive of collateral held from securities lending) will be invested in the constituent securities of the Index and investments that have economic characteristics that are substantially identical to the economic characteristics of such constituent securities. Bloomberg Index Services Limited (the Index Provider), designed the Index to provide long exposure to the Bloomberg U.S. Aggregate Bond Index while seeking to manage interest rate risk through the use of short positions in U.S. Treasury securities (U.S. Treasuries). The Index is comprised of a long portfolio and short portfolio. The long portfolio of the Index intends to replicate the Bloomberg U.S. Aggregate Bond Index, which broadly captures the U.S. investment grade, fixed income securities market and is comprised of U.S. Treasuries and U.S. Government-related bonds ( e.g. , obligations of the U.S. Government or its agencies or instrumentalities), corporate bonds, mortgage-backed pass-through securities, commercial mortgage-backed securities and asset-backed securities that are publicly offered for sale in the United States. The short portfolio of the Index holds short positions in U.S. Treasuries (or futures providing exposure to U.S. Treasuries in the case of the Fund) that seek to correspond to a duration exposure matching the duration of the long portfolio, with a targeted total duration exposure of approximately zero years ( e.g. , if the average duration of bonds in the long portfolio is approximately five years, the short portfolio will seek an average duration of approximately five years among its short holdings of U.S. Treasuries, with an aggregate targeted duration of Index holdings of approximately zero years). Duration is a measure used to determine the sensitivity of a portfolio to changes in interest rates with a longer duration portfolio being more sensitive to changes in interest rates. The Index methodology weights the short exposure to U.S. Treasuries of differing maturities in an attempt to offset the sensitivity of the long exposure to overall moves in interest rate. Additionally, the Index seeks to mitigate, to the extent possible, relative moves in interest rates across the yield curve. The long portfolio and short portfolio of the Index are rebalanced on a monthly basis. The Index is designed to have greater returns than an equivalent non-interest rate hedged investment when U.S. Treasury rates are rising significantly. Conversely, the Index is designed to have lower returns than an equivalent non-interest rate hedged investment when U.S. Treasury rates are falling significantly. A significant portion of the bonds represented in the long portion of the Index are U.S. agency mortgage-backed pass-through securities. U.S. agency mortgage-backed pass-through securities are securities issued by entities such as Government National Mortgage Association (GNMA) and Federal National Mortgage Association (FNMA) that are backed by pools of mortgages. Most transactions in mortgage-backed pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified until a few days prior to settlement, referred to as a to-be-announced transaction or TBA Transaction. In a TBA Transaction, the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount and price. The actual pools delivered generally are determined two days prior to the settlement date; however, it is not anticipated that the Fund will receive pools, but instead will participate in rolling TBA Transactions. The Fund expects to enter into such contracts on a regular basis. The Fund, pending settlement of such contracts, will invest its assets in high-quality, liquid short term instruments. In seeking to track the short portfolio of the Index, the Fund will invest in short positions in futures contracts on U.S. Treasuries. The Fund may also short U.S. Treasuries. To the extent the Index is concentrated in the securities of companies assigned to a particular industry or group of industries, the Fund will seek to concentrate its investments ( i.e. , invest more than 25% of its total assets) in such industry or group of industries to approximately the same extent as the Index. Show less