NUAG tracks an index that aims to offer enhanced exposure to the broad US investment-grade universe. Starting with a typical broad investment-grade index, NUAGs index breaks the universe into 38 individual categories and reweights the categories to maximize yield-to-worst, subject to multiple constraints to ensure the resulting exposure still resembles the general sector, risk, and quality profile of the parent index. NUAG may be an option for investors looking to add yield while wanting to maintain a passive and market-like exposure to the broad US investment grade universe. The index invests across varying maturities and is rebalanced monthly.