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 down 3 points (0.0%) at 14,544 as of Monday, April 22, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 1,423 issues advancing vs. 1,490 declining with 125 unchanged. The Basic Materials sector currently sits up 0.1% versus the S&P 500, which is up 0.3%. A company within the sector that fell today was Freeport-McMoRan Copper & Gold ( FCX), up 0.35. Top gainers within the sector include Halliburton Company ( HAL), up 4.9%, Randgold Resources ( GOLD), up 4.0%, Marathon Petroleum ( MPC), up 2.2%, LyondellBasell Industries ( LYB), up 2.1% and Goldcorp ( GG), up 1.8%. TheStreet Ratings group would like to highlight 4 stocks pushing the sector lower today: 4. Ultrapar Holdings ( UGP) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, Ultrapar Holdings is down $0.47 (-1.8%) to $26.12 on heavy volume Thus far, 312,544 shares of Ultrapar Holdings exchanged hands as compared to its average daily volume of 389,400 shares. The stock has ranged in price between $25.99-$26.25 after having opened the day at $26.01 as compared to the previous trading day's close of $26.59. Ultrapar Holdings Inc., through its subsidiaries, operates in the petrochemicals industry. Ultrapar Holdings has a market cap of $14.4 billion and is part of the energy industry. The company has a P/E ratio of 31.2, above the S&P 500 P/E ratio of 17.7. Shares are up 19.3% year to date as of the close of trading on Friday. TheStreet Ratings rates Ultrapar Holdings as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, growth in earnings per share, increase in net income, good cash flow from operations and solid stock price performance. We feel these strengths outweigh the fact that the company has had generally high debt management risk by most measures that we evaluated. Get the full Ultrapar Holdings 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.