Money market mutual fund assets fell by $24.25 billion to $3.879 trillion in the week ended Feb. 18 said the ICI in its latest weekly release. Prime Institutional funds increased by $9.6 billion to $1.183 trillion, reclaiming their position as the largest category of money fund assets. Government Institutional funds (including Treasury funds) decreased by $26.1 billion to $1.165 trillion. Retail assets eased lower while Tax Exempt money funds continue to see outflows. Assets were likely impacted by tax-related outflows on the 15th of the month and outflows related to the long President's Day weekend. In other news, see the new "Additional Information Regarding the Reserve Primary Fund" posting.