Most Investors Continued to Boost Holdings of MBS during 2002, New IM&A Analysis Reveals Faced with few safe, high yielding alternatives, investors continued to plow a substantial amount of their investment dollars into the U.S. mortgage-related securities market last year, a new analysis reveals. According to numbers compiled by Inside MBS & ABS, major investor groups added more than $440 billion in mortgage securities to their investment portfolios during 2002. This was just $52 billion