Investor Corner/The asset classes/Mutual Fund Core Concepts
2.3.10 Portfolio Turnover
Portfolio turnover measures how frequently a fund buys and sells the securities it holds. High turnover increases transaction costs and can generate more taxable events inside the fund's own trading activity.
What the figure actually measures
A fund with 100% annual turnover has, on average, replaced roughly its entire portfolio over the course of a year. A fund with 20% turnover holds most of its positions for several years at a time. Neither figure alone determines whether a fund is well run, but it does say a great deal about that fund's underlying investment style.
The costs that come with frequent trading
Every buy and sell transaction inside a fund carries brokerage and other transaction costs, which are borne by the fund and ultimately reduce the return handed to investors, even though these costs sit outside the headline expense ratio. High turnover can also mean the fund manager is reacting frequently to short-term price moves rather than holding convictions through normal, temporary volatility.
Reading turnover in context
A momentum-driven fund is expected to show naturally higher turnover as part of its stated strategy, and that alone is not necessarily a red flag if the strategy is being executed as described. Turnover becomes more of a genuine concern when it is unusually high for a fund's stated style, since that can signal a manager drifting from strategy or over-trading around short-term market noise.
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