NEW YORK ( TheStreet) -- Shares of Dynavax Technologies Corporation (Nasdaq: DVAX) were gapping down Wednesday morning with an open price 18.5% lower than Tuesday's closing price. The stock closed at $5.09 Tuesday and opened today's trading at $4.15. The average volume for Dynavax has been 1.6 million shares per day over the past 30 days. Dynavax has a market cap of $750.5 million and is part of the health care sector and drugs industry. Shares are up 53.3% year to date as of the close of trading on Tuesday. Dynavax Technologies Corporation, a clinical-stage biopharmaceutical company, discovers and develops novel products to prevent and treat infectious diseases. TheStreet Ratings rates Dynavax as a sell. The area that we feel has been the company's primary weakness has been its disappointing return on equity. You can view the full Dynavax Ratings Report. Get more investment ideas from our investment research center.