At least 21 of 78 prime money market mutual funds would have "broken the buck" (meaning their net asset value per share would fall below $1) without support during the financial crisis, according to the Federal Reserve Bank of Boston.

The report, The Stability of Prime Money Market Mutual Funds: Sponsor Support from 2007 to 2011, uses information gleaned from audited financial statement filings with the U.S. Securities and Exchange Commission (SEC). The authors examined these public records for 341 prime MMMFs, and provide in the report a complete data set of the direct support instances and related amounts.

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