Setting a record for the fifth week in a row, U.S. money market mutual fund assets jumped to $696.14 billion for the week ending June 16, according to the Investment Company Institute.
The run-up in assets - which exceeded the revised $694.72 billion achieved the previous week - affected money market funds of all types.
Assets of the nation's 688 retail money market funds held $485.86 billion for the week ending June 14, a jump of $1.45 billion from the week before.
Assets of the 425 retail taxable money market funds held $389.34 billion, a $2.07 billion increase over the prior week.
Institutional money market funds, however, closed the week with $210.29 billion, a $30.7 million decline over the previous week.
Taxable funds in that category grew to $185.83 billion, up $784.8 million. Assets of the 64 tax-exempt funds fell to $24.46 billion by $815 million from the week before.
The ICI reports the assets of money market funds to the Federal Reserve Board every week and makes this information available to the public.