You can use https://etfdb.com/tool/etf-stock-exposure-tool/ to find etfs that have a given stock as a top holding.
In [1]: def two_day_return(r1, r2): total_return = ((1+r1)*(1+r2) - 1) return total_return In [2]: r1 = -0.1; r2 = 0.1 print(round(two_day_return(r1, r2), 2)) -0.01 In [3]: print(round(two_day_return(2*r1, 2*r2), 2)) -0.04