NEW YORK ( TheStreet) -- DexCom (Nasdaq: DXCM) is trading at unusually high volume Thursday with 1.4 million shares changing hands. It is currently at four times its average daily volume and trading down $1.38 (-8.4%) at $15.04 as of 12:36 p.m. ET.

DexCom has a market cap of $1 billion and is part of the health care sector and health services industry. Shares are up 20.3% 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 weak operating cash flow. You can view the full DexCom Ratings Report.

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