What follows is a look at stocks in the S&P 500 [ .SPX 1065.64  -4.88 (-0.46%) ] displaying unusual volume in today's trading session.  Some of the highlights include: CVS Caremark Corp (CVS), Ims Health Inc (RX), Whole Foods Market Inc (WFMI) and CF Industries Holdings Inc (CF).

>> Behind By The Numbers' Unusual Trading Volume Updates

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