Share your insights or perspective on the financial matter presented in the input.

Why do mutual fund trading limitations exist? e.g. 90 day transfer limits?
Mutual funds (that are not exchange-traded funds) often need to sell some  of their securities to get cash when a shareholder redeems some shares. Such transactions incur costs that are paid (proportionally) by all the shareholders in the fund, not just the person requesting redemption, and thus the remaining shareholders get a lower return. (Exchange-traded funds are traded as if they are shares of common stock,  and a shareholder seeking a redemption pays the costs of the redemption). For this reason, many mutual funds do not allow redemptions for some period of time after a purchase, or purchases for some period of time after a redemption. The periods of time are chosen by the fund, and are stated in the prospectus (which everyone has acknowledged has been received before an investment was made).