This study investigates Chinese equity mutual funds’ performances while holding those that are well behaved in financial disclosure (transparent) companies, so-called peace of mind investing. This study uses detailed semi-annual data on mutual funds from 2011 to 2020, and finds that holding these transparent companies’ stocks is profitable for mutual funds and trusted by investors, thereby boosting their inflows. However, there is no significant evidence that mutual funds can beat the market portfolio when fees are considered. The study then provides possible explanations for the above findings from mutual fund managers’ skills and mutual holdings between institutional shareholders of fund management and transparent companies.