NEW YORK ( TheStreet) -- Shares of Regeneron Pharmaceuticals (Nasdaq: REGN) were gapping up Thursday morning with an open price 12.5% higher than Wednesday's closing price. The stock closed at $127.11 Wednesday and opened today's trading at $143.06. The average volume for Regeneron has been one million shares per day over the past 30 days. Regeneron has a market cap of $11.25 billion and is part of the health care sector and drugs industry. Shares are up 129.3% year to date as of the close of trading on Wednesday. Regeneron Pharmaceuticals, Inc., a biopharmaceutical company, discovers, develops, and commercializes medicines for the treatment of serious medical conditions in the United States. TheStreet Ratings rates Regeneron as a hold. The company's strengths can be seen in multiple areas, such as its solid stock price performance and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, disappointing return on equity and weak operating cash flow. You can view the full Regeneron Ratings Report. Get more investment ideas from our investment research center.