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.

Institutional money fund assets rose $11.40 billion to $1.885 trillion during the same period. Among institutional funds, taxable assets rose $13.5 billion to $1.74 trillion, while tax-exempt assets fell $2.10 billion to $140.86 billion.

The seven-day average yield was unchanged at 0.03%, as was the 30-day average yield, also at 0.03%, according to iMoneyNet's Money Fund Report. The seven-day compounded yield and the 30-day compounded yield also remained at 0.03%.

The average maturity of portfolios held by money funds was 41 days, down from 42.

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