Mutual funds are becoming increasingly popular with the emergence of Internet finance. Clear profiling of a fund's investment style is crucial for fund managers to evaluate their investment strategies, and for investors to understand their investment. However, it is challenging to profile a fund's investment style as it requires a comprehensive analysis of complex multi‐dimensional temporal data. In addition, different fund managers and investors have different focuses when analysing a fund's investment style. To address the issue, we propose iFUNDit, an interactive visual analytic system for fund investment style analysis. The system decomposes a fund's critical features into performance attributes and investment style factors, and visualizes them in a set of coupled views: a fund and manager view, to delineate the distribution of funds' and managers' critical attributes on the market; a cluster view, to show the similarity of investment styles between different funds; and a detail view, to analyse the evolution of fund investment style. The system provides a holistic overview of fund data and facilitates a streamlined analysis of investment style at both the fund and the manager level. The effectiveness and usability of the system are demonstrated through domain expert interviews and case studies by using a real mutual fund dataset. iFUNDit is an interactive visual analytics system for fund investment style analysis. Itdecomposes a fund's critical features into performance attributes and investment stylefactors, and visualizes them in a set of coupled views: the Fund View and Manager View, todelineate the distribution of funds' and managers' critical attributes on the market; the Cluster view, to show the similarity of investment styles between different funds; and theDetail View, to analyze the evolution of fund investment style. The system provides a holisticoverview of fund data and facilitates streamlined analysis of investment style at both thefund and the manager level. The effectiveness and usability of the system are demonstrated through domain expert interviews and case studies by using a real mutual fund dataset.