Simplify Stable Income ETF seeks to provide monthly income.he Funds investment adviser seeks to fulfill the funds investment objective by using two income strategies: (1) an interest income strategy and (2) an income generating option strategy. The fund invests primarily in interest income producing U.S. Treasury securities such as bills, notes, and bonds and fixed income ETFs that invest primarily in U.S. Treasuries. To generate additional income, the fund employs an option spread writing strategy on equity ETFs and fixed income ETFs.