Abstract
In this paper we examine market level data on the net investment into broad categories of UK mutual funds (known as unit trusts) collated by the Investment Management Association (IMA). We use these data to calculate a measure known as the 'performance gap' that is used by both Friesen and Sapp (2007) and by Dichev and Yu (2009). Our data spans the period from 1992 to the end of 2009 and therefore represents a significant sample period over which to study this phenomenon. Our results are broadly in keeping with those of previous research in this area, which has been achieved using US mutual fund data. The UK data that we use here suggest that on average the investment timing decisions of retail investors with regard to equity mutual funds has cost them performance of just under 1.2% per year over the eighteen year period of our study.
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