Money market mutual funds ended their 18-week losing streak as investors sought the safety of cash in increasingly volatile markets. Total money fund assets rose by $24.23 billion to $2.878 trillion for the week ending May 12, according to the Investment Company Institute.

Retail money market mutual fund assets climbed $12.83 billion to $992.95 billion. Among retail funds, taxable assets rose $12.26 billion to $778.87 billion and tax-exempt assets rose $570 million to $214.08 billion.

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