NEW YORK ( TheStreet) -- Shares of Siga Technologies (Nasdaq: SIGA) were gapping down Monday morning with an open price 16% lower than Friday's closing price. The stock closed at $5.75 Friday and opened today's trading at $4.83. The average volume for Siga has been 723,100 shares per day over the past 30 days. Siga has a market cap of $317.6 million and is part of the health care sector and drugs industry. Shares are down 58.9% year to date as of the close of trading on Friday. SIGA Technologies, Inc., a bio-defense company, engages in the research, discovery, development, and commercialization of novel products for the prevention and treatment of infectious diseases. TheStreet Ratings rates Siga as a hold. The company's strengths can be seen in multiple areas, such as its compelling growth in net income, largely solid financial position with reasonable debt levels by most measures and notable return on equity. However, as a counter to these strengths, we also find weaknesses including weak operating cash flow and a generally disappointing performance in the stock itself. You can view the full Siga Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.