The Investment Company Institute's latest weekly "Money Market Fund Assets" report shows money fund assets jumping $39.7 billion to a record $7.919 trillion, after they decreased $21.5 billion the previous week. MMF assets are up by $904 billion, or 12.9%, over the past 52 weeks (through 6/17/26), with Institutional MMFs up $710 billion, or 17.2% and Retail MMFs up $194 billion, or 6.7%. Year-to-date in 2026, MMF assets are up by $186 billion, or 2.4%, with Institutional MMFs up $178 billion, or 3.8% and Retail MMFs up $8 billion, or 0.3%. ICI's weekly release says, "Total money market fund assets increased by $39.67 billion to $7.92 trillion for the week ended Wednesday, June 17, the Investment Company Institute reported.... Among taxable money market funds, government funds increased by $36.26 billion and prime funds increased by $40 million. Tax-exempt money market funds increased by $3.37 billion." ICI's stats show Institutional MMFs increasing $49.5 billion and Retail MMFs decreasing $9.8 billion in the latest week. Total Government MMF assets, including Treasury funds, were $6.540 trillion (82.5% of all money funds), while Total Prime MMFs were $1.231 trillion (15.6%). Tax Exempt MMFs totaled $148.3 billion (1.8%). It explains, "Assets of retail money market funds decreased by $9.79 billion to $3.09 trillion. Among retail funds, government money market fund assets decreased by $8.71 billion to $1.96 trillion, prime money market fund assets decreased by $2.95 billion to $986.52 billion, and tax-exempt fund assets increased by $1.87 billion to $134.32 billion." Retail assets account for 39.3% of the total, and Government Retail assets make up 63.8% of all Retail MMFs. They add, "Assets of institutional money market funds increased by $49.46 billion to $4.83 trillion. Among institutional funds, government money market fund assets increased by $44.97 billion to $4.57 trillion, prime money market fund assets increased by $2.99 billion to $244.38 billion, and tax-exempt fund assets increased by $1.50 billion to $14.01 billion." Institutional assets accounted for 60.7% of all MMF assets, with Government Institutional assets making up 94.7% of all institutional MMF totals. According to Crane Data's separate Money Fund Intelligence Daily series, money fund assets have increased by $63.7 billion to $8.355 trillion month-to-date in June (as of 6/17). Assets hit a record high on June 16 of $8.370 trillion. Assets increased $208.6 billion in May, decreased by $108.8 billion in April, $49.3 billion in March, increased $99.5 billion in February, $32.9 billion in January, $126.3 billion in December, $132.8 billion in November, $142.1 billion in October, $105.2 billion in September and $132.0 billion in August. They rose $63.7 billion in July and $6.7 billion last June. 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.