Banks, thrifts and credit unions expanded their stakes in the residential MBS market over the first half of 2011 as most other major investor classes pulled back from the market, according to a new analysis by Inside MBS & ABS. But the profile of the MBS investment community will likely continue to change as the Federal Reserve has opted to resume buying agency MBS in an effort to stimulate the economy by pushing long-term interest rates lower. While the result of resumed Fed MBS purchases is uncertain, the Federal Open Market Committee’s decision to reinvest payments on the Fed’s agency MBS back into...(Includes one data chart)