NEW YORK ( TheStreet) -- NuVasive (Nasdaq: NUVA) is trading at unusually high volume Thursday with 2.9 million shares changing hands. It is currently at four times its average daily volume and trading down $1.03 (-6.3%) at $15.28 as of 3:20 p.m. ET. NuVasive has a market cap of $578.7 million and is part of the health care sector and health services industry. Shares are up 8.8% year to date as of the close of trading on Wednesday. NuVasive, Inc., a medical device company, engages in the design, development, and marketing of minimally disruptive surgical products and procedures for the spine. Its products are used in applications for spine fusion surgery. TheStreet Ratings rates NuVasive as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, generally disappointing historical performance in the stock itself and feeble growth in its earnings per share. You can view the full NuVasive 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.