Apr 07, 2013· We use an elite group of 12 ETFs in the StumpGrinder portfolio. Related Articles StumpGrinder: An Open Source Actively Managed Portfolio of ETFs introductory overview. Why do low volatility ETFs have alpha? StumpGrinder: Allocations where we report the monthly allocations to each ETF. StumpGrinder: Performance where we track the performance of the actually traded portfolio.