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 All three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 3 points (0.0%) at 14,977 as of Monday, May 6, 2013, 12:49 PM ET. The NYSE advances/declines ratio sits at 1,675 issues advancing vs. 1,221 declining with 157 unchanged. The Materials & Construction industry currently sits up 0.4% versus the S&P 500, which is up 0.2%. On the negative front, top decliners within the industry include Nortek ( NTK), down 2.52, and Empresas ICA S.A.B. de C.V ( ICA), down 1.50. Top gainers within the industry include Progressive Waste Solutions ( BIN), up 3.3%, Standard Pacific ( SPF), up 2.4%, Louisiana-Pacific ( LPX), up 1.8%, EMCOR Group ( EME), up 1.6% and Clean Harbors ( CLH), up 1.5%. TheStreet Ratings group would like to highlight 3 stocks pushing the industry lower today: 3. Gafisa ( GFA) is one of the companies pushing the Materials & Construction industry lower today. As of noon trading, Gafisa is down $0.13 (-3.2%) to $3.87 on light volume Thus far, 622,559 shares of Gafisa exchanged hands as compared to its average daily volume of 1.8 million shares. The stock has ranged in price between $3.86-$4.02 after having opened the day at $3.98 as compared to the previous trading day's close of $4.00. Gafisa S.A. operates as a homebuilder in Brazil. Gafisa has a market cap of $837.1 million and is part of the industrial goods sector. Shares are down 14.0% year to date as of the close of trading on Friday. TheStreet Ratings rates Gafisa as a sell. Among the areas we feel are negative, one of the most important has been poor profit margins. Get the full Gafisa 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.