What is 'Portfolio Turnover'
Portfolio turnover is a measure of how frequently assets within a fund are bought and sold by the managers. Portfolio turnover is calculated by taking either the total amount of new securities purchased or the amount of securities sold  whichever is less  over a particular period, divided by the total net asset value (NAV) of the fund. The measurement is usually reported for a 12month time period.
BREAKING DOWN 'Portfolio Turnover'
The portfolio turnover measurement should be considered by an investor before deciding to purchase a given mutual fund or similar financial instrument. After all, a firm with a high turnover rate will incur more transaction costs than a fund with a lower rate. Unless the superior asset selection renders benefits that offset the added transaction costs they cause, a less active trading posture may generate higher fund returns.
In addition, cost conscious fund investors should take note that the transactional brokerage fee costs are not included in the calculation of a fund's operating expense ratio and thus represent what can be, in highturnover portfolios, a significant additional expense that reduces investment return.

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Investing Basics
What Is Portfolio Turnover?
Portfolio turnover measures a fund’s percentage of assets that are bought and sold by its manager over a year. 
Fundamental Analysis
How to Calculate a Turnover Ratio
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Fundamental Analysis
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How should I use portfolio turnover to evaluate a mutual fund?
Learn about the turnover rate for mutual funds, and understand the effect higher turnover may have on fund performance and ... Read Answer >> 
What is considered a good turnover ratio for a mutual fund?
Understand what the concept of turnover ratio represents in relation to a mutual fund, and how an investor can evaluate a ... Read Answer >> 
What is a good turnover ratio for a mutual fund?
Learn about mutual fund turnover ratios and why the ideal ratio may differ based on the type of mutual fund and your investment ... Read Answer >> 
How can a mutual fund raise or lower its turnover ratio?
Find out how a fund manager can raise or lower a fund's turnover ratio, including how to interpret this metric and what it ... Read Answer >> 
What does a high turnover ratio signify for an investment fund? (KNOW)
Find out more about the turnover ratio, what the turnover ratio measures and what a high turnover ratio indicates about an ... Read Answer >> 
How can a company raise its asset turnover ratio?
Find out more about the asset turnover ratio, what it measures, how to calculate the ratio and how a company could increase ... Read Answer >>