There are a couple of potential risks associated with mutual funds:
1. Potential for loss of principal
Portfolio managers can't guarantee the performance of the fund, creating potential for loss of principal on the investment.
2. The diluting effect of diversification
At times, a fund's diversification can have a diluting effect on positive returns. For example, if one stock in the fund doubles its share price, that's not necessarily reflected in the fund's overall return. as other stock in the fund may fall which can lead to an overall loss.