NEW YORK ( TheStreet) -- Shares of DexCom (Nasdaq: DXCM) were gapping down Thursday morning with an open price 24% lower than Wednesday's closing price. The stock closed at $9.80 Wednesday and opened today's trading at $7.45.

The average volume for DexCom has been 571,500 shares per day over the past 30 days. DexCom has a market cap of $632.9 million and is part of the health care sector and health services industry. Shares are down 28.2% year to date as of the close of trading on Wednesday.

DexCom, Inc., a medical device company, engages in the design, development, and commercialization of continuous glucose monitoring systems for people with diabetes in the United States.

TheStreet Ratings rates DexCom as a sell. Among the areas we feel are negative, one of the most important has been a generally disappointing historical performance in the stock itself. You can view the full DexCom Ratings Report.

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