(EMAILWIRE.COM, December 12, 2009 ) Dallas, TX - SIGA Technologies, Inc. (NASDAQ:SIGA) plunged 28.42% to $5.24 on 11.37 million shares. The stock hit an intraday high and an intraday low of $7.42 and $4.83 respectively. In the last six months the stock went down over 31%. SIGA Technologies, Inc. is a drug development company in the biodefense arena. Its portfolio of existing drug candidates and its platform for developing additional countermeasures against potential agents of biological warfare are intended to fill a critical need for treatments.


Targacept , Inc. (NASDAQ:TRGT) was down 4.27% to $22.19. The stock hit an intraday high and an intraday low of $23.54 and $20.58 respectively. In the last six months the stock went up over 784%. Targacept, Inc. is a biopharmaceutical company engaged in the design, discovery and development of neuronal nicotinic receptors (NNR) Therapeutics for the treatment of multiple diseases and disorders of the central nervous system.


Sirona Dental Systems, Inc. (NASDAQ:SIRO) declined 7.50% to $32.31 on 2.49 million shares. The stock hit an intraday high and an intraday low of $32.70 and $31.80 respectively. In the last six months the stock went up over 64%. Sirona Dental Systems, Inc. is a manufacturer of dental equipment. Sirona focuses on developing systems and solutions for dentists globally. The Company provides a range of advanced products in each of the four primary areas: Dental CAD/CAM Systems; Imaging Systems; Treatment Centers and Instruments.

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