ICI's latest weekly "Money Market Fund Assets" report shows assets flat after falling the previous week, which included the June 15 quarterly tax date. Year-to-date, MMFs are down by $162 billion, or -3.4%, with Institutional MMFs down $138 billion, or -4.3% and Retail MMFs down $24 billion, or -1.6%. Over the past 52 weeks, money fund assets are down by $4 billion, or -0.1%, with Retail MMFs rising by $12 billion (0.9%) and Inst MMFs falling by $16 billion (-0.5%). (For the month of June, through 6/22, MMF assets have increased by $16.8 billion to $4.976 trillion according to Crane's MFI Daily, which tracks a broader universe of funds.) ICI's weekly release says, "Total money market fund assets increased by $1.89 billion to $4.54 trillion for the week ended Wednesday, June 22, the Investment Company Institute reported.... Among taxable money market funds, government funds decreased by $3.74 billion and prime funds increased by $5.64 billion. Tax-exempt money market funds decreased by $9 million." ICI's stats show Institutional MMFs falling $8.7 billion and Retail MMFs increasing $10.6 billion in the latest week. Total Government MMF assets, including Treasury funds, were $4.014 trillion (88.4% of all money funds), while Total Prime MMFs were $426.1 billion (9.4%). Tax Exempt MMFs totaled $102.6 billion (2.3%). ICI explains, "Assets of retail money market funds increased by $10.62 billion to $1.44 trillion. Among retail funds, government money market fund assets increased by $6.22 billion to $1.14 trillion, prime money market fund assets increased by $4.19 billion to $213.27 billion, and tax-exempt fund assets increased by $208 million to $92.81 billion." Retail assets account for just under a third of total assets, or 31.8%, and Government Retail assets make up 78.8% of all Retail MMFs. They add, "Assets of institutional money market funds decreased by $8.73 billion to $3.10 trillion. Among institutional funds, government money market fund assets decreased by $9.96 billion to $2.88 trillion, prime money market fund assets increased by $1.45 billion to $212.82 billion, and tax-exempt fund assets decreased by $217 million to $9.83 billion." Institutional assets accounted for 68.2% of all MMF assets, with Government Institutional assets making up 92.8% of all Institutional MMF totals. (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.)