NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed 48 money market funds (MMFs), following a regularly scheduled review of the sector. The MMFs affirmed include 46 U.S.-based MMFs, regulated by the Securities and Exchange Commission (SEC) under rule 2a-7 (Rule 2a-7), as well as two Cayman Islands-based MMFs that invest in USD-denominated securities. Collectively, the 48 MMFs had approximately $609.1 billion of assets under management as of May 2015. A complete list of the 48 affirmed MMFs ca