NEW YORK ( TheStreet) -- DexCom (Nasdaq: DXCM) is trading at unusually high volume Thursday with 1.9 million shares changing hands. It is currently at four times its average daily volume and trading down $1.89 (-14.1%) at $11.50 as of 2:21 p.m. ET.

DexCom has a market cap of $829.9 million and is part of the health care sector and health services industry. Shares are down 1.9% 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. The area that we feel has been the company's primary weakness has been its disappointing return on equity. You can view the full DexCom Ratings Report.

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