Assets invested in money market mutual funds jumped 1.78%, to $1.205 trillion, in the week that ended July 8, the Investment Company Institute reported.
The increase, $21.08 billion, marked the largest weekly inflow since April 8, a spokeswoman for the Washington-based trade group said.
The across-the-board rise was most pronounced in portfolios for institutional investors, which gained 2.62%, to $475.15 billion. That includes $429.91 billion in taxable funds, up $11.09 billion, and $45.23 billion in tax-exempt funds, up $1.02 billion.
On the retail side, assets climbed 1.24%, to $729.49 billion. Taxable portfolios held $593.10 billion, up $5.49 billion. Tax-exempt funds totaled $136.39 billion, up $3.48 billion.