The basic materials sector closed the day up 2.6%. Extorre Gold Mines ( XG), Quaterra Resources Inc ( QMM), China Gerui Advanced Materials Group ( CHOP), and HKN Inc ( HKN) were all decliners today within the basic materials sector with YPF Sociedad Anonima ( YPF) being today's featured basic materials loser. YPF Sociedad Anonima fell $1.58 (-4.3%) to $35.21 on average volume. Throughout the day, 414,549 shares of YPF Sociedad Anonima exchanged hands as compared to its average daily volume of 414,100 shares. YPF SOCIEDAD ANONIMA, an energy company, engages in the exploration, development, and production of crude oil, natural gas, and liquefied petroleum gas (LPG) in Argentina. YPF Sociedad Anonima has a market cap of $14.7 billion and is part of the energy industry. The company has a P/E ratio of 10.1, below the average energy industry P/E ratio of 20.9 and below the S&P 500 P/E ratio of 17.7. Shares are down 27% year to date as of the close of trading on Tuesday. TheStreet Ratings rates YPF Sociedad Anonima as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, reasonable valuation levels and notable return on equity. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, poor profit margins and weak operating cash flow.