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 lower today with the Dow Jones Industrial Average ( ^DJI) trading up 40 points (0.3%) at 12,582 as of Friday, Nov. 16, 2012, 11:59 AM ET. The NYSE advances/declines ratio sits at 1,549 issues advancing vs. 1,392 declining with 99 unchanged. The Materials & Construction industry currently sits down 0.5% versus the S&P 500, which is down 0.1%. On the negative front, top decliners within the industry include Foster Wheeler ( FWLT), down 3.3%, James Hardie Industries ( JHX), down 2.1% and Vulcan Materials Company ( VMC), down 1.3%. Top gainers within the industry include Toll Brothers ( TOL), up 1.6%, Lennar Corporation ( LEN), up 1.2%, PulteGroup ( PHM), up 1.0% and DR Horton ( DHI), up 0.7%. TheStreet Ratings group would like to highlight 5 stocks pushing the industry lower today: 5. Martin Marietta Materials ( MLM) is one of the companies pushing the Materials & Construction industry lower today. As of noon trading, Martin Marietta Materials is down $1.31 (-1.6%) to $81.25 on light volume Thus far, 111,127 shares of Martin Marietta Materials exchanged hands as compared to its average daily volume of 439,500 shares. The stock has ranged in price between $81.25-$83.28 after having opened the day at $82.70 as compared to the previous trading day's close of $82.56. Martin Marietta Materials, Inc., together with its subsidiaries, engages in the production and sale of aggregates for the construction industry primarily in the United States, Canada, the Bahamas, and the Caribbean Islands. Martin Marietta Materials has a market cap of $3.8 billion and is part of the industrial goods sector. The company has a P/E ratio of 54.1, above the S&P 500 P/E ratio of 17.7. Shares are up 9.5% year to date as of the close of trading on Thursday. Currently there are 3 analysts that rate Martin Marietta Materials a buy, no analysts rate it a sell, and 9 rate it a hold. TheStreet Ratings rates Martin Marietta Materials as a hold. The company's strengths can be seen in multiple areas, such as its revenue growth, increase in net income and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we also find weaknesses including disappointing return on equity, weak operating cash flow and poor profit margins. Get the full Martin Marietta Materials Ratings Report now.