Assets in U.S. money market funds grew 0.04% to $815.24 billion for the week ending March 13, according to the Investment Company Institute.
The slight gain in overall assets came despite a selloff in institutional money market funds.
Assets in the nation's 667 retail money market funds increased $5.16 billion, reaching $569.3 billion.
Taxable retail portfolios rose $4.95 billion, to $459.14 billion, and tax-exempt portfolios increased $208.6 million, to $110.16 million.
Meanwhile, assets in the 293 institutional money funds fell $4.79 billion, to $245.94. Assets in taxable institutional funds fell $4.69 billion, to $218.72, while assets in tax-exempt funds dipped $99 million, to $27.23 billion.