... Working Paper Series Federal Reserve Bank of Boston . The Stability of Prime Money Market Mutual Funds: Sponsor Support from 2007 to 2011 Steffanie A. Brady, Ken E. Anadu, and ... about the significance of the support to the sponsor, but rather our focus is on the impact of support to prime MMMFs and its potential to cause investors to perceive that prime MMMF portfolios ... prevent the market value NAV of the fund from falling below $1.00. The largest support instance noted relative to AUM was the $336.8 million, or 6.3% of AUM, support to the Russell Money Market...