NEW YORK ( TheStreet) -- Shares of Thoratec Corporation (Nasdaq: THOR) were gapping up Thursday morning with an open price 15.3% higher than Wednesday's closing price. The stock closed at $30.81 Wednesday and opened today's trading at $35.51. The average volume for Thoratec has been 821,300 shares per day over the past 30 days. Thoratec has a market cap of $1.83 billion and is part of the health care sector and health services industry. Shares are down 8.2% year to date as of the close of trading on Wednesday. Thoratec Corporation develops, manufactures, and markets proprietary medical devices used for circulatory support. The company has a P/E ratio of 26.7, below the average health services industry P/E ratio of 28 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Thoratec as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, impressive record of earnings per share growth, compelling growth in net income and good cash flow from operations. Although the company may harbor some minor weaknesses, we feel they are unlikely to have a significant impact on results. You can view the full Thoratec Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping up? Get free SMS text alerts sent to you when the action happens by texting UP to 95370 or select from multiple alert options.