Editor's Note: Any reference to TheStreet Ratings and its underlying recommendation does not reflect the opinion of TheStreet, Inc. or any of its contributors including Jim Cramer or Stephanie Link. All three major indices are trading down today with the Dow Jones Industrial Average ( ^DJI) trading down 34 points (-0.2%) at 15,991 as of Tuesday, Dec. 10, 2013, 11:45 AM ET. The NYSE advances/declines ratio sits at 1,256 issues advancing vs. 1,637 declining with 176 unchanged. The Materials & Construction industry currently sits up 0.1% versus the S&P 500, which is down 0.2%. A company within the industry that fell today was Stericycle Incorporated ( SRCL), up 0.6%. Top gainers within the industry include Lennar Corporation ( LEN), up 2.4%, DR Horton ( DHI), up 0.9%, Weyerhaeuser ( WY), up 0.8% and Cemex S.A.B. de C.V ( CX), up 0.8%. TheStreet would like to highlight 3 stocks pushing the industry lower today: 3. MDU Resources Group ( MDU) is one of the companies pushing the Materials & Construction industry lower today. As of noon trading, MDU Resources Group is down $0.16 (-0.6%) to $29.26 on light volume. Thus far, 108,348 shares of MDU Resources Group exchanged hands as compared to its average daily volume of 570,700 shares. The stock has ranged in price between $29.20-$29.50 after having opened the day at $29.20 as compared to the previous trading day's close of $29.42. MDU Resources Group, Inc. operates as a diversified natural resource company in the United States. The company's Electric segment generates, transmits, and distributes electricity in Montana, North Dakota, South Dakota, and Wyoming. MDU Resources Group has a market cap of $5.6 billion and is part of the utilities sector. The company has a P/E ratio of 48.1, above the S&P 500 P/E ratio of 17.7. Shares are up 40.4% year to date as of the close of trading on Monday. Currently there are 4 analysts that rate MDU Resources Group a buy, no analysts rate it a sell, and 4 rate it a hold. TheStreet Ratings rates MDU Resources Group as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, good cash flow from operations, increase in net income and solid stock price performance. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity. Get the full MDU Resources Group Ratings Report now. STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12-months. Learn more.