Tax-exempt money market funds had $3.13 billion of inflows as total net assets grew to $260.97 billion in the week ended June 10, according to The Money Fund Report, a service of iMoneyNet.com.

The positive flow represents the most significant weekly growth the funds have experienced since income tax season prompted investors to remove $17.21 billion before and after the April 15 federal deadline for individuals and corporations. The flow accelerated from last week when total net assets increased to $257.84 billion following the arrival of $411 million of new cash.

The average, seven-day simple yield for the 423 reporting tax-exempt money market funds remained at 0.01% for the sixth week straight, while the average maturity increased by two days to 30 days compared to the prior week.

The total net assets of the 1,026 reporting taxable money funds fell by $5.85 billion to $2.333 trillion in the week ended June 11, compared to the previous week when the arrival of $9.36 billion of cash caused total net assets to increase to $2.339 trillion.

The average, seven-day simple yield for the taxable money funds remained at 0.01% for the fourth consecutive week, while the average maturity remained at 48 days.

Overall, the combined total net assets of the 1,449 reporting money funds dropped by $2.72 billion to $2.594 trillion in the week ended June 11, versus inflows of $9.77 billion in the previous week when total net assets ended at $2.597 trillion.