Total U.S. money market mutual fund assets fell by $13.12 billion to $2.63 trillion for the week that ended Wednesday, according to the Investment Company Institute.

Assets in the nation’s retail money market mutual funds rose by $1.04 billion to $922.76 billion, the Washington-based mutual fund trade group said Thursday. Assets of taxable money market funds in the retail category rose $670 million to $727.92 billion. Tax-exempt retail fund assets rose $370 million to $194.84 billion.