MMF Assets Fly Up to $7.77 Trillion
The Investment Company Institute's latest weekly "Money Market Fund Assets" report shows money fund assets rising $16.9 billion to $7.771 trillion, after they increased $1.1 billion the previous week and jumped by $127.0 billion two weeks ago. MMFs fell by a massive $175.8 billion 5 weeks ago, their largest weekly drop ever. Assets hit a record high $7.856 trillion 9 weeks ago. MMF assets are up by $803 billion, or 11.5%, over the past 52 weeks (through 5/20/26), with Institutional MMFs up $586 billion, or 14.3% and Retail MMFs up $217 billion, or 7.5%. Year-to-date in 2026, MMF assets are up by $38 billion, or 0.5%, with Institutional MMFs up $27 billion, or 0.6% and Retail MMFs up $11 billion, or 0.4%. ICI's weekly release says, "Total money market fund assets increased by $16.88 billion to $7.77 trillion for the week ended Wednesday, May 20, the Investment Company Institute reported.... Among taxable money market funds, government funds increased by $16.34 billion and prime funds increased by $946 million. Tax-exempt money market funds decreased by $409 million." ICI's stats show Institutional MMFs increasing $12.8 billion and Retail MMFs increasing $4.0 billion in the latest week. Total Government MMF assets, including Treasury funds, were $6.395 trillion (82.3% of all money funds), while Total Prime MMFs were $1.227 trillion (15.8%). Tax Exempt MMFs totaled $149.7 billion (1.9%). It explains, "Assets of retail money market funds increased by $4.04 billion to $3.09 trillion. Among retail funds, government money market fund assets increased by $2.97 billion to $1.96 trillion, prime money market fund assets increased by $1.35 billion to $988.31 billion, and tax-exempt fund assets decreased by $274 million to $136.40 billion." Retail assets account for 39.7% of the total, and Government Retail assets make up 63.6% of all Retail MMFs. They add, "Assets of institutional money market funds increased by $12.84 billion to $4.68 trillion. Among institutional funds, government money market fund assets increased by $13.38 billion to $4.43 trillion, prime money market fund assets decreased by $404 million to $238.40 billion, and tax-exempt fund assets decreased by $135 million to $13.29 billion." Institutional assets accounted for 60.3% of all MMF assets, with Government Institutional assets making up 94.6% of all institutional MMF totals. According to Crane Data's separate Money Fund Intelligence Daily series, money fund assets have increased by $121.4 billion to $8.204 trillion month-to-date in May (as of 5/20), assets hit a record high on March 18 of $8.280 trillion. Assets 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, $6.7 billion in June and $100.9 billion last May. 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.
