STR Holdings was the top lagger, shedding 10.8% as the stock was downgraded to accumulate from buy at Craig Hallum's with a target price of $21 per share.

Transatlantic Petroleum lost 9.1% after news that the GRB-1 well could be abandoned.

EXCO Resources declined 7.6% after S&P Rating Services placed the company's RTGS on credit-watch negative.

JA Solar ( JASO) erased 2.1% after Brean Murray, equity analyst at Wayne Chang, downgraded the stock to sell from hold with a target price of $4 per share.

Others on the downside were Energy Transfer Equity ( ETE), Quicksilver Resources ( KWK) and Enbridge Energy Partners ( EEP) with marginal losses.

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