U.S. money market fund assets rose by $13 billion in the week ended December 8, the Money Fund Report said on Wednesday.

Taxable money market fund assets rose by $10.4 billion to $2.88 trillion, while tax-free assets rose by $2.6 billion to $408.7 billion, according to the report, published by iMoneyNet.

Yields on taxable money market funds held at a record low of 0.03 percent for a third consecutive week. Tax-free and municipal money-market fund yields set a fresh all-time low of 0.03 percent, down from 0.04 percent a week ago.