Stocks are holding their gains in midday trading today. A surprisingly good jobs report came out early this morning and the major indices up over 1%. The unemployment rate dropped a little bit more in January to 8.3%. The Dow hit its highest level in 3 years today, up 153 points to 12,859. The Nasdaq and the S&P are also up today, up 47 points and 18 points respectively. The jobs report has overshadowed news out of Europe that Greece may need an additional $20 billion in its bailout.

Zoltek Companies, Inc. (NASDAQ:ZOLT) is up 38.33% in midday trading at $13.10. ZOLT has traded 3.2 million shares so far today, way above its daily average of 263 thousand shares. ZOLT is up today following a strong first quarter from the company. Zoltek posted a profit of $0.28 per share, up from a loss of $0.05 per share a year ago. Net sales for the company rose 43% to $47 million. The company has a market cap of 448.50 million.

Constant Contact, inc. (NASDAQ:CTCT) is up 22.31% in midday trading at $31.85. CTCT has traded 2.2 million shares already today, 4 times its daily average. Constant Contact rose today after posting a fourth quarter profit of $0.27 a share, beating analyst estimate of $0.24 a share. The company has a market cap of 950.19 million.

Silicon Image, Inc. (NASDAQ:SIMG) is up 18.04% today at $6.03. SIMG has traded 3.8 million shares so far today, 4 times its daily average. SIMG shares are up today after the company beat estimates by $0.03 and beat on revenue. Forecast for the first quarter is in line with estimates. The company has a market cap of 490.39 million.

Idenix Pharmaceuticals, Inc. (NASDAQ:IDIX) is down 13.12% in midday trading at $11.52. IDIX has traded 7 million shares today, more than 3 times its daily average volume. Idenix announced this morning the removal of the partial clinical hold on HCV Nucleotide Inhibitor, IDX 184. One of the company’s biggest rivals, Gilead Sciences, released positive data for its Hepatitis C drug today. The company has a market cap of 1.12 billion.

Entropic Communications, Inc. (NASDAQ:ENTR) is down 6% today at $6.58. ENTR has traded 2.5 million shares at midday, double its daily average. ENTR shares are down some today after the stock rallied yesterday on good quarterly results. The company has a market cap of 575.45 million.

Vertex Pharmaceuticals Inc. (NASDAQ:VRTX) is down 4.91% today at $36.49. VRTX has traded 5.7 million shares so far today, 2 million more than its daily average. VRTX was downgraded to neutral from outperform earlier today at Cowen. The company has a market cap of 7.61 billion.