The total assets held by money market mutual funds slipped to $2.568 trillion, falling by $10.3 billion, for the week ended Sept. 19, according to data from the Investment Company Institute.

For the same period, total taxable government funds decreased by $6.68 billion, taxable non-government funds decreased by $2.04 billion, and tax-exempt funds decreased by $1.6 billion.

On the institutional side, assets of institutional money market funds decreased to $1.679 trillion, falling $12.2 billion. Among differing classes of institutional funds, taxable government money market fund assets decreased to $678.35 billion, with a $7.28 billion drop; and taxable non-government money market fund assets fell by $3.64 billion to $919.52 billion.

Retail money funds actually saw some growth as total retail money market funds' assets increased by $1.88 billion, climbing to $888.73 billion. Taxable government money market fund assets in the retail category also increased to $187.21 billion, rising by $600 million; taxable non-government money market fund assets increased to $512.89 billion, climbing by $1.6 billion. However, tax-exempt fund assets decreased by $330 million to $188.63 billion.