Article: Zacks.com Featured Expert Kevin Matras Highlights: Allied World Assurance Company Holdings, Ltd., DG FastChannel, Inc., Delek US Holdings, Hansen Natural Corp. and CGI Group, Inc.

CHICAGO -- Kevin Matras shows why looking for stocks with upgraded broker ratings can upgrade your portfolio to a whole new level. Stocks in this week's article include Allied World Assurance Company Holdings, Ltd. (NYSE: AWH), DG FastChannel, Inc. (NASDAQ: DGIT), Delek US Holdings, Inc. (NYSE: DK), Hansen Natural Corp. (NASDAQ: HANS) and CGI Group, Inc. (NYSE: GIB). Click here for the full story exclusively on Zacks.com: http://at.zacks.com/?id=109

Screen of the Week written by Kevin Matras of Zacks Investment Research:

I'm sure there are a lot of you out there that have experienced the pleasure of waking up and seeing that a covering broker upgraded ...

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