Generally speaking, when the following two conditions are met at the same time, money market funds may lose their principal:
First, the market yield rose sharply in the short term, which led to a sharp drop in securities prices;
Second, the money fund redeemed a large number at the same time, unable to hold bonds with falling maturity prices, and caused actual losses after selling bonds.
According to relevant calculations, the probability of a single-day principal loss of money market funds is very small (0.06 1 17%). If you hold it for a week or a month, the probability of principal loss is close to zero.