Tax-free money market funds continued on their record-breaking streak this week.

Although they took in $8.11 billion for the week ending May 19 - compared with $11.9 billion last week - that was still enough to spike assets to $519.6 billion, topping the prior week's record high of $511.5 billion, according to the Money Fund Report, a service of Westborough, Mass.-based iMoneynet.com.

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