Finding an optimal balance between risk and returns in investment portfolios is a central challenge in quantitative finance, often addressed through Markowitz portfolio theory (MPT). While traditional portfolio optimization is carried out in a continuous fashion, as if stocks could be bought in...

In this paper, we examine the performance of an impact investing strategy using the most ethical companies to build an impact investing portfolio. We test the time-series and cross-sectional returns of the impact portfolio, explore the financial analyst coverage of the most ethical firms, and...