NEW YORK ( TheStreet) -- Shares of Houston American Energy Corporation (AMEX: HUSA) were gapping down Thursday morning with an open price 36.1% lower than Wednesday's closing price. The stock closed at $3.49 Wednesday and opened today's trading at $2.23. The average volume for Houston American Energy has been 558,000 shares per day over the past 30 days. Houston American Energy has a market cap of $126.5 million and is part of the basic materials sector and energy industry. Shares are down 71.4% year to date as of the close of trading on Wednesday. Houston American Energy Corp. engages in the exploration, development, and production of natural gas, crude oil, and condensate. It primarily focuses on properties located in the Gulf Coast area of the United States and Colombia in South America. TheStreet Ratings rates Houston American Energy as a sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, poor profit margins, weak operating cash flow and generally disappointing historical performance in the stock itself. You can view the full Houston American Energy Ratings Report. Get more investment ideas from our investment research center.