Valero Energy (VLO) erased 7.6% as the company's second-quarter profit missed analysts' estimates on higher-than-expected losses at its Canadian refinery.
Advantage Oil & Gas (AAV) shed 6.7%.
Suntech Power Holdings (STP) declined 6.7% as Deutsche Bank equity analyst Eric Cheng has downgraded the stock to hold from buy with a price target of $6.2 per share.Newfield Exploration (NFX) and Cheniere Energy Partners (CQP) trimmed 6.6% and 6.5%, respectively. Rosetta Resources (ROSE) lost 6.3% after receiving a downgrade to neutral from positive with a price target of $60 per share from Susquehanna equity analyst Gray Peckham. Also on the downside were Denbury Resources (DNR) and Suncor Energy (SU), closing the week down around 6%.
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