Total U.S. money market mutual fund assets fell by $2.03 billion to $2.678 trillion for the week that ended Wednesday, according to the Investment Company Institute.

Assets in the nation’s retail money market mutual funds fell by $2.34 billion to $913.7 billion, the Washington-based mutual fund trade group said Thursday. Assets of taxable money market funds in the retail category fell $1.94 billion to $719.37 billion. Tax-exempt retail fund assets fell by $410 million to $194.29 billion.