The Investment Company Institute's latest "Money Market Fund Assets" report shows MMF assets inching higher after declining for four of the past five weeks. Assets have risen by $638 billion, or 13.2%, over the prior 21 weeks (breaking the $5.4 billion at the end of May). ICI shows assets up by $723 billion, or 15.3%, year-to-date in 2023, with Institutional MMFs up $372 billion, or 12.2% and Retail MMFs up $352 billion, or 21.0%. Over the past 52 weeks, money fund assets have risen $876 billion, or 19.1%, with Retail MMFs rising by $553 billion (37.4%) and Inst MMFs rising by $323 billion (10.4%). Their weekly release says, "Total money market fund assets increased by $4.22 billion to $5.46 trillion for the week ended Wednesday, July 19, the Investment Company Institute reported.... Among taxable money market funds, government funds increased by $1.01 billion and prime funds increased by $7.56 billion. Tax-exempt money market funds decreased by $4.35 billion." ICI's stats show Institutional MMFs falling $3.0 billion and Retail MMFs rising $7.2 billion in the latest week. Total Government MMF assets, including Treasury funds, were $4.495 trillion (82.3% of all money funds), while Total Prime MMFs were $850.0 billion (15.6%). Tax Exempt MMFs totaled $113.2 billion (2.1%). ICI explains, "Assets of retail money market funds increased by $7.21 billion to $2.03 trillion. Among retail funds, government money market fund assets increased by $5.57 billion to $1.35 trillion, prime money market fund assets increased by $5.34 billion to $574.10 billion, and tax-exempt fund assets decreased by $3.69 billion to $102.47 billion." Retail assets account for over a third of total assets, or 37.2%, and Government Retail assets make up 66.7% of all Retail MMFs. They add, "Assets of institutional money market funds decreased by $2.99 billion to $3.43 trillion. Among institutional funds, government money market fund assets decreased by $4.55 billion to $3.14 trillion, prime money market fund assets increased by $2.22 billion to $275.94 billion, and tax-exempt fund assets decreased by $663 million to $10.71 billion." Institutional assets accounted for 62.8% of all MMF assets, with Government Institutional assets making up 91.7% of all Institutional MMF totals. (According to Crane Data's separate Money Fund Intelligence Daily series, money fund assets have increased by $20.0 billion in July through 7/19 to $5.866 trillion. Note that ICI's asset totals don't include a number of funds tracked by the SEC and Crane Data, so they're over $400 billion lower than Crane's asset series.)