Since the beginning of the year FED has gradually lowered its purchases of asset backed securities - QE3. Until it ended the stimulus program on 29th of Oct.
It is interesting, however, to note that the corrections following the FED announcements has been more and more limited. It should be of no surprise as FED sends several upbeat signals to markets that it is not worried about global weakness, low inflation or a wobble in financial markets.
Now when the QE is over the attention is already shifted towards tightening. With current expectations as early as June 2015 there should not be a major tension on the markets for a "considerable time" (using the FED wording).
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CH