Prime Retail money market funds, which have been increasing strongly in recent months, accounted for almost all of the overall MMF asset increase in the latest week ($7.8 billion of the total $8.1 billion). The Investment Company Institute's latest weekly "Money Market Fund Assets" report shows assets rising after falling for 3 weeks in a row. Year-to-date, MMFs are down by $135 billion, or -2.9%, with Institutional MMFs down $155 billion, or -4.8% and Retail MMFs up $20 billion, or 1.4%. Over the past 52 weeks, money fund assets are up by $43 billion, or 1.0%, with Retail MMFs rising by $63 billion (4.4%) and Inst MMFs falling by $20 billion (-0.6%). (For the month of August through 8/24, MMF assets have increased by $34.9 billion to $5.032 trillion according to Crane's MFI XLS, which tracks a broader universe of funds than ICI.) ICI's weekly release says, "Total money market fund assets increased by $8.08 billion to $4.57 trillion for the week ended Wednesday, August 24, the Investment Company Institute reported today. Among taxable money market funds, government funds decreased by $925 million and prime funds increased by $7.63 billion. Tax-exempt money market funds increased by $1.37 billion." ICI's stats show Institutional MMFs increasing $2.7 billion and Retail MMFs increasing $5.4 billion in the latest week. Total Government MMF assets, including Treasury funds, were $3.971 trillion (86.9% of all money funds), while Total Prime MMFs were $498.4 billion (10.9%). Tax Exempt MMFs totaled $100.5 billion (2.2%). ICI explains, "Assets of retail money market funds increased by $5.40 billion to $1.49 trillion. Among retail funds, government money market fund assets decreased by $3.57 billion to $1.13 trillion, prime money market fund assets increased by $7.84 billion to $269.01 billion, and tax-exempt fund assets increased by $1.14 billion to $89.92 billion." Retail assets account for just under a third of total assets, or 32.6%, and Government Retail assets make up 75.9% of all Retail MMFs. They add, "Assets of institutional money market funds increased by $2.68 billion to $3.08 trillion. Among institutional funds, government money market fund assets increased by $2.65 billion to $2.84 trillion, prime money market fund assets decreased by $208 million to $229.33 billion, and tax-exempt fund assets increased by $239 million to $10.58 billion." Institutional assets accounted for 67.4% of all MMF assets, with Government Institutional assets making up 92.2% 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.)