The Investment Company Institute released its latest weekly "Money Market Fund Assets" report Thursday, which shows money fund assets rising $43.8 billion to a record $7.303 trillion. MMFs rose $52.4 billion last week, and $17.2 billion the week before. MMF assets are up by $979 billion, or 15.5%, over the past 52 weeks (through 9/10/25), with Institutional MMFs up $574 billion, or 15.2% and Retail MMFs up $406 billion, or 15.8%. Year-to-date, MMF assets are up by $453 billion, or 6.6%, with Institutional MMFs up $222 billion, or 5.4% and Retail MMFs up $230 billion, or 8.4%. ICI's weekly release says, "Total money market fund assets increased by $43.82 billion to $7.30 trillion for the week ended Wednesday, September 10, the Investment Company Institute reported.... Among taxable money market funds, government funds increased by $41.22 billion and prime funds increased by $3.15 billion. Tax-exempt money market funds decreased by $551 million." ICI's stats show Institutional MMFs increasing $42.6 billion and Retail MMFs increasing $1.2 billion in the latest week. Total Government MMF assets, including Treasury funds, were $5.956 trillion (81.6% of all money funds), while Total Prime MMFs were $1.209 trillion (16.6%). Tax Exempt MMFs totaled $137.7 billion (1.9%). It explains, "Assets of retail money market funds increased by $1.24 billion to $2.97 trillion. Among retail funds, government money market fund assets increased by $203 million to $1.86 trillion, prime money market fund assets increased by $1.17 billion to $976.73 billion, and tax-exempt fund assets decreased by $133 million to $125.14 billion." Retail assets account for 40.8% of the total, and Government Retail assets make up 62.9% of all Retail MMFs. They add, "Assets of institutional money market funds increased by $42.58 billion to $4.34 trillion. Among institutional funds, government money market fund assets increased by $41.02 billion to $4.09 trillion, prime money market fund assets increased by $1.98 billion to $232.73 billion, and tax-exempt fund assets decreased by $418 million to $12.54 billion." Institutional assets accounted for 59.2% of all MMF assets, with Government Institutional assets making up 94.3% of all institutional MMF totals. According to Crane Data's separate Money Fund Intelligence Daily series, money fund assets increased by $70.1 billion month-to-date in September (through 9/10/25) to a record $7.672 trillion. Assets increased by $132.0 billion in August, $63.7 billion in July, $6.7 billion in June and $100.9 billion in May. They fell by $24.4 billion in April, but rose $2.8 trillion in March, $94.2 billion in February and $52.8 billion in January. They jumped $110.9 billion in December, $200.5 trillion in November, $97.5 billion in October and $149.8 billion last September. Note that ICI's asset totals don't include a number of funds tracked by the SEC and Crane Data, so they're almost $400 billion lower than Crane's asset series.
