ICI's latest weekly "Money Market Fund Assets" report shows assets up strongly in the latest week after being flat the previous week (and up sharply the week before that). Year-to-date, MMFs are down by $152 billion, or -3.2%, with Institutional MMFs down $108 billion, or -3.4% and Retail MMFs down $44 billion, or -1.4%. Over the past 52 weeks, money fund assets are down by $53 billion, or -1.1%, with Retail MMFs falling by $9 billion (-0.6%) and Inst MMFs falling by $44 billion (-1.4%). (For the month of June, through 6/8, MMF assets have increased by $34.0 billion to $4.994 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 $26.40 billion to $4.55 trillion for the week ended Wednesday, June 8, the Investment Company Institute reported.... Among taxable money market funds, government funds increased by $19.89 billion and prime funds increased by $4.96 billion. Tax-exempt money market funds increased by $1.54 billion." ICI's stats show Institutional MMFs rising $22.5 billion and Retail MMFs increasing $3.9 billion in the latest week. Total Government MMF assets, including Treasury funds, were $4.023 trillion (88.4% of all money funds), while Total Prime MMFs were $427.3 billion (9.4%). Tax Exempt MMFs totaled $102.6 billion (2.3%). ICI explains, "Assets of retail money market funds increased by $3.86 billion to $1.42 trillion. Among retail funds, government money market fund assets decreased by $440 million to $1.13 trillion, prime money market fund assets increased by $2.44 billion to $205.94 billion, and tax-exempt fund assets increased by $1.86 billion to $92.59 billion." Retail assets account for just under a third of total assets, or 31.3%, and Government Retail assets make up 79.0% of all Retail MMFs. They add, "Assets of institutional money market funds increased by $22.53 billion to $3.13 trillion. Among institutional funds, government money market fund assets increased by $20.33 billion to $2.90 trillion, prime money market fund assets increased by $2.52 billion to $221.36 billion, and tax-exempt fund assets decreased by $324 million to $10.01 billion." Institutional assets accounted for 68.7% of all MMF assets, with Government Institutional assets making up 92.6% 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.)