The company said that, effective from 1 December, Chris St John has stepped down as lead manager of the fund, with Nigel Yates taking over the mandate instead.
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"Chris and Nigel continue to work closely together in managing the portfolio, and there will be no changes to the investment philosophy and investment process of the fund," a spokesperson added.
St John joined the company in 2005 as a portfolio manager, while Yates became an equity portfolio manager in 2021.
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The fund has failed to outperform the IA UK All Companies sector in the last five years, returning 12.4% compared to the sector's return of 24.5% during the same time period, according to data from FE fundinfo.
As of 6 December, the strategy had just over £600m in assets. According to Morningstar Direct, the fund reached its peak in assets under management in February 2014, when it held £4.9bn in assets.