NEW YORK ( TheStreet) -- Delta Petroleum Corporation (Nasdaq: DPTR) is trading at unusually high volume Wednesday with 11.5 million shares changing hands. It is currently at four times its average daily volume and trading down 11 cents (-9.5%) at $1.06 as of 12:06 p.m. ET. Delta has a market cap of $333.7 million and is part of the basic materials sector and energy industry. Shares are up 54% year to date as of the close of trading on Tuesday. Delta Petroleum Corporation and its subsidiaries engage in the exploration, acquisition, development, production, and sale of natural gas and crude oil primarily in the Rocky Mountain and onshore Gulf Coast regions. TheStreet Ratings rates Delta as sell. The company's weaknesses can be seen in multiple areas, such as its generally weak debt management and generally disappointing historical performance in the stock itself. You can view the full Delta Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.