NEW YORK ( TheStreet) -- ATP Oil & Gas (Nasdaq: ATPG) is trading at unusually high volume Tuesday with 5.7 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down $1.58 (-17.9%) at $7.23 as of 3:06 p.m. ET. ATP Oil & Gas has a market cap of $550.6 million and is part of the basic materials sector and energy industry. Shares are down 47.4% year to date as of the close of trading on Monday. ATP Oil & Gas Corporation engages in the acquisition, development, and production of oil and natural gas properties in the Gulf of Mexico, the United Kingdom, and the Dutch sectors of the North Sea. TheStreet Ratings rates ATP Oil & Gas as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, generally weak debt management, 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 ATP Oil & Gas 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.