From Financial Times
Next month the new rules of the Securities and Exchange Commission (SEC) will become effective for money market funds (MM funds).
Most importantly, MM funds with any assets from institutional shareholders – e.g., corporations, pension plans and insurance companies – will no longer maintain a constant net asset value per share of $1. Instead, the net asset value of institutional MM funds will fluctuate on a daily basis – for example, 99.8 cents per share on one day, and $1.01 per share on the next.
The new SEC rules apply to institutional MM funds investing in short-term debt of cities and states – called “municipal” MM funds. The new rules also apply to institutional MM funds investing primarily in short-term debt of banks and top-rated companies – called “prime” MM funds.