Fair Isaac Corporation is selling off today as investors continue to digest the fallout from the Federal Housing Finance Agency's decision to ease credit data requirements for Fannie Mae and Freddie Mac. This regulatory shift, which threatens the company's long-standing dominance in the mortgage credit-rating market, has triggered a wave of investor concern and prompted multiple law firms to launch investigations into potential securities claims regarding the company's disclosures of these risks. The downward pressure follows a volatile week for the stock, which has been compounded by aggressive competitive pricing from rivals like TransUnion and a significant price target cut from Bank of America.