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 up today with the Dow Jones Industrial Average ( ^DJI) trading up 87 points (0.5%) at 16,606 as of Thursday, May 8, 2014, 12:55 PM ET. The NYSE advances/declines ratio sits at 1,938 issues advancing vs. 1,065 declining with 159 unchanged. The Materials & Construction industry currently sits up 0.4% versus the S&P 500, which is up 0.5%. Top gainers within the industry include Armstrong World Industries ( AWI), up 2.6%, Owens-Corning ( OC), up 2.3%, Masco ( MAS), up 2.3%, James Hardie Industries ( JHX), up 2.1% and USG ( USG), up 1.5%. 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 $0.39 (-1.1%) to $35.38 on light volume. Thus far, 200,013 shares of MDU Resources Group exchanged hands as compared to its average daily volume of 627,700 shares. The stock has ranged in price between $35.38-$36.05 after having opened the day at $35.72 as compared to the previous trading day's close of $35.77. 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 $6.7 billion and is part of the utilities sector. Shares are up 17.1% year-to-date as of the close of trading on Wednesday. Currently there are 5 analysts that rate MDU Resources Group a buy, no analysts rate it a sell, and 3 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, solid stock price performance and increase in net income. We feel these strengths outweigh the fact that the company shows low profit margins. 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.