The State Street Fixed Income Sector Rotation ETF seeks to provide excess return by tactically allocating among income and yield-generating ETFs based on a proprietary process that combines quantitative and qualitative analysisThe fund primarily invests in ETFs that focus on one or more of the following sectors of the fixed income market: bonds issued by U.S. government or agency, treasury inflation protected securities (TIPS), corporate bonds, mortgage-backed securities, high yield bonds, international (including emerging markets) government and corporate bonds, senior loans, floating rate notes, cash equivalents, etc.The Fund invests at least 80% of its net assets in fixed income securities through ETFsTypically rebalanced monthly, but rebalancing may occur more or less frequently depending on market conditions