Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model Two out of the three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 15 points (0.1%) at 14,565 as of Thursday, April 4, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 1,512 issues advancing vs. 1,354 declining with 153 unchanged. The Basic Materials sector currently sits down 0.1% versus the S&P 500, which is up 0.1%. On the negative front, top decliners within the sector include Suncor Energy ( SU), down 2.7%, Cenovus Energy ( CVE), down 2.6%, Tenaris ( TS), down 1.9%, Canadian Natural Resources ( CNQ), down 1.8% and National Oilwell Varco ( NOV), down 1.4%. Top gainers within the sector include New Gold ( NGD), up 4.9%, Yamana Gold ( AUY), up 2.1%, Anglogold Ashanti ( AU), up 2.2%, Barrick Gold Corporation ( ABX), up 1.4% and Monsanto Company ( MON), up 1.3%. TheStreet Ratings group would like to highlight 5 stocks pushing the sector lower today: 5. Marathon Oil ( MRO) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, Marathon Oil is down $0.60 (-1.8%) to $32.59 on average volume Thus far, 2.7 million shares of Marathon Oil exchanged hands as compared to its average daily volume of 5.0 million shares. The stock has ranged in price between $32.42-$33.15 after having opened the day at $33.11 as compared to the previous trading day's close of $33.19. Marathon Oil Corporation operates as an energy company worldwide. Marathon Oil has a market cap of $23.8 billion and is part of the energy industry. The company has a P/E ratio of 15.1, below the S&P 500 P/E ratio of 17.7. Shares are up 8.3% year to date as of the close of trading on Wednesday. Currently there are 11 analysts that rate Marathon Oil a buy, no analysts rate it a sell, and 6 rate it a hold. TheStreet Ratings rates Marathon Oil as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, attractive valuation levels, expanding profit margins, good cash flow from operations and largely solid financial position with reasonable debt levels by most measures. We feel these strengths outweigh the fact that the company has had sub par growth in net income. Get the full Marathon Oil Ratings Report now. Exclusive Offer: Jim Cramer's 'go-to' small/mid-cap guru Bryan Ashenberg only buys stocks he thinks could return 50-100%. See his top picks for 14-days FREE.