NEW YORK ( TheStreet) -- Teekay Tankers (NYSE: TNK) is trading at unusually high volume Tuesday with 2.1 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down 24 cents (-4.5%) at $5.04 as of 3:45 p.m. ET. Teekay Tankers has a market cap of $224.8 million and is part of the services sector and transportation industry. Shares are up 50% year to date as of the close of trading on Monday. Teekay Tankers Ltd., together with its subsidiaries, engages in the ownership and operation of oil tankers. As of August 16, 2011, it owned a fleet of nine double-hull Aframax tankers and six double-hull Suezmax tankers. The company has a P/E ratio of 30.8, below the average transportation industry P/E ratio of 91 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Teekay Tankers as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, generally disappointing historical performance in the stock itself and feeble growth in its earnings per share. You can view the full Teekay Tankers 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.