Tax-exempt municipal money market funds lost nearly $3 billion in the week ended March 28 as total net assets fell to $319.30 billion, according to the Money Fund Report, a service of iMoneyNet.com.

Some $2.90 billion fled tax-exempt funds this week following modest inflows of $137.8 million in the week ended March 21 that left the funds with $322.2 billion.

In other activity this week, the 479 tax-exempt reporting funds’ average seven-day simple yield remained unchanged at 0.03%, while the average maturity declined one day to 27 days.

Meanwhile, assets of the 1,140 taxable money market funds grew by $13.44 billion to $2.396 trillion in total net assets in the week ended March 29. That followed outflows of $5.49 billion in the week ended March 22 when the funds ended with $2.383 trillion. The seven-day yield for taxable funds remained at 0.03%, while the average maturity was unchanged at 45 days.

Overall, the combined assets of the 1,619 money funds reporting gained $10.54 billion and settled at $2.716 trillion in the week ended March 29. That followed a $5.35 billion outflow in the week ended March 22 when the funds finished with $2.705 trillion.