Trident Microsystems, Inc. (NASDAQ:TRID) is up 12.90% in after hours trading at $0.07. TRID got hammered today after filing for bankruptcy protection. TRID closed down 68.48% today at $0.0620 with 37.7 million shares traded. The company has a market cap of 11.34 million.

AMR Corporation (NYSE:AMR) is up 7.92% at $0.26 in after hours trading. AMR closed down 16.08% today at $0.24. AMR shares will be delisted from the NYSE before the opening bell tomorrow. AMR traded 38.1 million shares today, 3 million shares more than its daily average. The company has a market cap of 80.45 million.

Arena Pharmaceuticals, Inc. (NASDAQ:ARNA) is trading up 8.09% in after hours trading at $1.96. ARNA closed the day down 5.73% at $1.81 with 5.8 million shares traded. ARNA started the day off hitting an intraday high of $2.04, but towards the end of the day quickly collapsed down to $1.81. The company has a market cap of 264.30 million.

A123 Systems, Inc. (NASDAQ:AONE) is up 3.65% in after hours trading at $1.99. AONE closed the day down 2.04% at $1.92. The stock traded 2.8 million shares which was slightly higher than its daily average of 2.6 million shares. AONE dipped slightly today after bouncing yesterday following news that their plug ins for electric sports cars have been fixed. The company has a market cap of 242.07 million.

Coldwater Creek Inc. (NASDAQ:CWTR) is up 3.60% in after hours trading at $1.15. CWTR closed the day down slightly losing 3.48% at $1.11. CWTR traded below average volume with 806 thousand shares, down from its daily average of 1.1 million shares. The company has a market cap of 134.99 million.

Zalicus Inc. (NASDAQ:ZLCS) is up 2.52% in after hours trading at $1.22. ZLCS finished the day down 2.46% at $1.19. ZLCS traded 417 thousand shares today about half its daily average volume. The company has a market cap of 117.42 million.

Sirius XM Radio Inc. (NASDAQ:SIRI) is up 1.64% in after hours trading at $1.86. SIRI closed the day down slightly losing 1.61% at $1.83. SIRI traded above average volume today with 68.1 million shares traded, about 14 million shares more than it average. Sirius just announced it added 1.7 million net subscribers in 2011. The company has a market cap of 6.86 billion.