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The purpose of this paper is to propose a new measure of portfolio activity, the modified turnover (MT), which represents the portion of the portfolio that the manager changes from one quarter to the next. Compared with the traditional turnover, the MT measure has a distinct interpretation, relies on portfolio holdings, includes the effects of flows and ignores the effects of offsetting trades.

Using quarterly holdings data, the authors examine the relationship between fund turnover, performance, and flows for a sample of 2,856 actively managed mutual funds over the period 1991-2012. The authors provide numerical examples to illustrate how the suggested measure, MT, is different from the traditional turnover measure. The authors use panel regressions, simple and double sorts to examine the predictability of performance.

The authors find evidence that high MT predicts lower performance. The comparison between the highest and lowest quintiles sorted based on MT reveals a difference of −2.41 percent in the annual risk-adjusted return. Furthermore, high MT predicts lower net flows. The authors also find that MT relates positively to other activeness measures while volatility, flows, size, number of stocks, and the expense ratio are significant determinants of MT. Overall, the results suggest that frequent churning of a portfolio is value destroying for investors and signals a manager’s lack of skill.

The authors offer a simple measure, namely, MT, for estimating the fraction of a portfolio that changes from one quarter to the next. Armed with this tool, the authors investigate whether funds deviate from their previous quarter’s holdings because of valuable or noisy information, and whether such signals are exploited by fund investors.

This study aims to comprehensively examine sustainable mutual funds (SMFs) research by conducting a systematic literature review and bibliometric analysis of articles spanning 33 years from 1991 to 2023. This review seeks to uncover the principal contributors and the structural framework of knowledge within the realm of business, finance and management research concerning SMFs.

Following the “Scientific Procedures and Rationales for Systematic Literature Reviews (SPAR-4-SLR)” methodology, the author selected 597 documents for the analysis and collected the bibliographic information from the Scopus database. The author uses RStudio and VOSviewer software to address five research questions.

The findings indicate a notable expansion in research concerning SMFs within high-quality journals over the last 33 years. The review illuminates the principal contributors in SMFs research by using performance analysis based on journal, article, author, country and institution criteria. By using science mapping techniques, the author identifies five prevailing themes and outlines future research prospects in the domain of SMFs.

This review paper can serve as a roadmap for future researchers, aiding them in discerning the trending research topics within this domain.

To the best of the author’s knowledge, this is the first study that comprehensively provides an overview of different variants, diverse strands and research hotspots of SMFs literature. The study offers insight into the evolution of SMFs, showcasing their progression from a segmented market to a prominently specialized domain in the contemporary landscape.