NEW YORK ( TheStreet) -- Clearwire (Nasdaq: CLWR) is trading at unusually high volume Thursday with 39.6 million shares changing hands. It is currently at 4.3 times its average daily volume and trading down 16 cents (-6.8%) at $2.12 as of 9:40 a.m. ET. Clearwire has a market cap of $624.3 million and is part of the technology sector and telecommunications industry. Shares are down 55.7% year to date as of the close of trading on Wednesday. Clearwire Corporation provides wireless broadband services. The company builds and operates mobile broadband networks that provide high-speed mobile Internet and residential access services, as well as residential voice services in communities in the United States. TheStreet Ratings rates Clearwire as a sell. The company's weaknesses can be seen in multiple areas, such as its disappointing return on equity, poor profit margins, generally disappointing historical performance in the stock itself and generally weak debt management. You can view the full Clearwire Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.