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. Two out of the three major indices are trading lower today with the Dow Jones Industrial Average ( ^DJI) trading up 22 points (0.1%) at 17,010 as of Monday, Sept. 15, 2014, 12:55 PM ET. The NYSE advances/declines ratio sits at 891 issues advancing vs. 2,107 declining with 158 unchanged. The Materials & Construction industry currently sits down 1.0% versus the S&P 500, which is down 0.2%. On the negative front, top decliners within the industry include Weyerhaeuser ( WY), down 0.7%, and Sherwin-Williams ( SHW), down 0.5%. 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 $1.50 (-5.0%) to $28.67 on heavy volume. Thus far, 1.2 million shares of MDU Resources Group exchanged hands as compared to its average daily volume of 559,400 shares. The stock has ranged in price between $27.43-$28.74 after having opened the day at $28.06 as compared to the previous trading day's close of $30.17. 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 $6.0 billion and is part of the utilities sector. Shares are down 1.2% year-to-date as of the close of trading on Friday. 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 increase in stock price during the past year, impressive record of earnings per share growth, compelling growth in net income, revenue growth and largely solid financial position with reasonable debt levels by most measures. We feel these strengths outweigh the fact that the company shows weak operating cash flow. 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.