The investment objective of the Sub-fund is to seek to track as closely as reasonably possible the performance of the Citigroup US Dollar World BIG Corporate Bond Index (the “Index”), a sub-sector of the Citigroup World Broad Investment Grade (WBIG) Bond IndexSM. The Index is designed to track the performance of US dollar-denominated bonds issued in the US investment-grade bond market. The USBIG Index includes institutionally traded US Treasury, government sponsored (US agency and supranational), mortgage, asset-backed, and investmentgrade securities. It provides a reliable and fair benchmark for an investment-grade portfolio manager. US Dollar World BIG Corporate Bond Index is the sector of the US BIG that covers corporate securities issued in USD.