The S&P 500 Index finished the first trading week of 2012 higher 1.61%, giving investors a better sense of optimism after a very rocky 2011. However, some companies faced selling pressure in the face of negative news. Here are the culprits:

CME Group Inc. (NASDAQ:CME): The Commodity Futures Trading Commission’s investigation of MF Global’s collapse is looking to determine if CME Group’s efforts to verify the safety of customer funds were sufficient, New York Times reports. If CME’s did take appropriate actions, the company could face sanctions and could even lose status as a self-regulator, but such action appears unlikely. CME Group closed at $234.00, down $4.62 or 1.94 percent. Their 52-week trading range has been $229.53 to $236.00.

Skechers U.S.A. (NYSE:SKX): A research tax benefit helped Skechers beat third quarter earnings-per-share estimates, while overall results lagged year-over-year. Declining sales for higher priced toning footwear down 25 percent Y/Y and lower sales across for other footwear reshaped expected results. Skechers U.S.A. closed at $11.70, down $0.3 or 2.5 percent. Their 52-week trading range has been $11.49 to $12.14.

BMC Software (NASDAQ:BMC): BMC Software (NASDAQ:BMC) bugged this past season by sales execution problems, gets an upgrade to Hold from JPMorgan’s John DiFucci. The upgrade is based on valuation, and DiFucci thinks the “disarray” he sees in BMC’s sales force “will continue for several quarters,” bad for its server management software business. BMC Software closed at $32.01, down $0.78 or 2.38 percent. Their 52-week trading range has been $31.78 to $32.79.

Telefonica S.A. (NYSE:TEF): Telefonica, the Spanish telecom slashed dividend for 2012 from 1.6 euros to 1.3 euros a share as, “economic and operating environment and financial markets conditions have changed materially.” At today’s price, dividend yield is down to around 10 percent. Telefonica closed at $16.58, down $0.28 or 1.66 percent. Their 52-week trading range has been $16.53 to $16.88.

Integra Lifesciences (NASDAQ:IART): Integra Lifesciences announced that it received a warning letter from the United States Food and Drug Administration related to quality systems and compliance issues at its collagen manufacturing facility located in Plainsboro, New Jersey. Integra closed at $24.49, down $6.01 or 19.7 percent. Their 52-week trading range has been $24.45 to $28.00.

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To contact the reporter on this story: Jim Wilkerson at staff.writers@wallstcheatsheet.com

To contact the editor responsible for this story: Damien Hoffman at editors@wallstcheatsheet.com

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