Meeting new peers: The effects of Morningstar category reassignment on fund flows and star ratings

We investigate how the reassignment of a fund's Morningstar category affects fund flow and Morningstar star rating. We find that funds assigned to a different category gain positive abnormal flows and this effect is significant mainly for high-rated funds. Category reassignment does not improve a fund's star rating on average, and flows are less responsive to a star-rating change if the rating change is likely to be driven by category reassignment. The positive abnormal flows captured by high-rated funds after category reassignment are consistent with a visibility story: some investors filter funds by Morningstar category and star rating, and category reassignment makes a fund more visible to a new group of investors if the fund is highly rated. In contrast, a low-rated fund is likely to be selected only by investors who do not refer to the fund's Morningstar information and, hence, gains little visibility from category reassignment. We also find evidence that more sophisticated investors are more likely to consider not only fund rating but also fund category when evaluating fund performance.