After years of holding onto investments in non-agency mortgage-backed securities even as prices declined significantly, the government-sponsored enterprises are preparing to sell some of their $101.5 billion in non-agency MBS holdings. Freddie Mac is offering $1.0 billion in non-agency MBS for sale with plans to unload as much as $5.0 billion this year, if pricing for the securities remains strong. A spokesman for the GSE said the sales are part of an effort to meet goals set by ... [Includes one data chart]