NEW YORK ( TheStreet) -- Vical Incorporated (Nasdaq: VICL) is trading at unusually high volume Friday with 2.9 million shares changing hands. It is currently at four times its average daily volume and trading down 53 cents (-12.4%) at $3.75 as of 9:55 a.m. ET. Vical has a market cap of $307.7 million and is part of the health care sector and drugs industry. Shares are down 2.9% year to date as of the close of trading on Thursday. Vical Incorporated engages in the research and development of biopharmaceutical products based on its deoxyribonucleic acid (DNA) delivery technologies for the prevention and treatment of serious or life-threatening diseases. TheStreet Ratings rates Vical as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures and solid stock price performance. However, as a counter to these strengths, we find that the company's return on equity has been disappointing. You can view the full Vical Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.