Total U.S. money-market mutual-fund assets rose by $3.33 billion to $2.59 trillion for the week that ended Wednesday, according to the Investment Company Institute.

The seven-day average yield on money-market mutual funds was unchanged at 0.01 percent from the previous week, according to Money Fund Report, a service of iMoneyNet. The seven-day compounded yield was flat at 0.01 percent.

Bankrate.com said its survey of 100 leading commercial banks, savings and loan associations and savings banks showed the annual percentage yield available on money-market accounts was unchanged from the week before at 0.11 percent.

Bankrate.com said that the annual percentage yield available on interest-bearing checking accounts was unchanged from the week before at 0.06 percent.

The annual percentage yield on six-month certificates of deposit was unchanged at 0.14 percent, Bankrate.com said. One-year CD yields fell to 0.23 percent from 0.24 percent, while two-year CD yields fell to 0.37 percent from 0.38 percent. The five-year yield was unchanged at 0.79 percent.