Responsible investment is increasingly prevalent, and both financial and moral concerns can drive such investment. In this article, we investigate how responsible investors of different wealth weigh financial and moral arguments. Prior research on different factors that may codetermine responsible investment behavior yield competing predictions about the influence of personal wealth on investment. We conduct a large-scale natural field experiment on responsible investment, wherein we treat investors with financial, moral, and no arguments. We find that there is a statistically and (...) economically significant difference in responsiveness to financial and moral arguments between investors of different wealth. Specifically, financial arguments are more effective than are moral arguments for high wealth investors but not for low wealth investors, and the effect is particularly high for the wealthiest investors. The findings hold for several different measures of wealth. Our findings contribute to the understanding of the moderating effect of wealth on responsible investment choice. Furthermore, these insights may enable more fine-tuned strategies to stimulate responsible investment among different individual investor segments. (shrink)