NEW YORK ( TheStreet) -- Shares of MannKind Corporation (Nasdaq: MNKD) were gapping down Friday morning with an open price 10.9% lower than Thursday's closing price. The stock closed at $2.47 Thursday and opened today's trading at $2.20. The average volume for MannKind has been 739,900 shares per day over the past 30 days. MannKind has a market cap of $377.6 million and is part of the health care sector and drugs industry. Shares are down 1.2% year to date as of the close of trading on Thursday. MannKind Corporation, a biopharmaceutical company, focuses on the discovery, development, and commercialization of therapeutic products for diabetes and cancer in the United States, Europe, and Asia. TheStreet Ratings rates MannKind as a sell. The company's weaknesses can be seen in multiple areas, such as its generally disappointing historical performance in the stock itself, poor profit margins and weak operating cash flow. You can view the full MannKind Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.