Premier Exhibitions, Inc. (NASDAQ:PRXI) is up 22.70% in late day trading at $2.27. PRXI has traded 573 thousand shares so far today, more than 10 times its daily average. PRXI really started to heat up today around 1pm. The company has a market cap of 107.18 million.

Arctic Cat Inc. (NASDAQ:ACAT) is up 20.27% today at $22.84. ACAT has traded 941 thousand shares so far today, well above its daily average of 115 thousand shares. ACAT jumped today on news the company is buying back stake from Suzuki Motor. The company has a market cap of 416.35 million.

Sequans Communications (NYSE:SQNS) is up 18% today at $2.95. SQNS has traded 859 thousand shares so far today, more than double its average. SQNS has recovered nicely today after being slightly negative in morning trading. The company has a market cap of 101.62 million.

Delcath Systems, Inc. (NASDAQ:DCTH) is up 9.84% in late day trading at $3.35. DCTH has traded 1.1 million shares so far today, well above its daily average of 523 thousand shares. DCTH is up today after its Ireland operations achieved ISO 13485 certification. The company has a market cap of 162.22 million.

PharmAthene, Inc. (AMEX:PIP) is up 6.96% today at $1.23. PIP has traded 283 thousand shares so far today and averages 473 thousand shares daily. The company has a market cap of 61.32 million.

HyperDynamics Corporation (NYSE:HDY) is up 5.86% today at $2.35. HDY has traded 5.5 million shares so far today, nearly double its daily average volume. Hyperdynamics announced earlier today they have resumed drilling off the coast of Guinea. The company has a market cap of 369.21 million.