New rules being considered for U.S. money-market mutual funds will make them safer for investors while forcing some smaller providers out of the business, Moody’s Investors Service analysts said this week in a research report.

The U.S. Securities and Exchange Commission may impose a floating share value on money funds that buy corporate debt and cater to the largest clients, known as institutional prime funds, a person familiar with the matter said May 10. Such a step would apply to funds holding $939 billion, or about 37 percent of U.S. money-fund assets, according to Westborough, Massachusetts-based research firm iMoneyNet.

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