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 down 32 points (-0.2%) at 15,645 as of Thursday, Sept. 19, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 1,343 issues advancing vs. 1,599 declining with 112 unchanged. The Diversified Services industry currently is unchanged today versus the S&P 500, which is down 0.1%. A company within the industry that fell today was Amerco ( UHAL), up 1.3%. Top gainers within the industry include Giant Interactive Group ( GA), up 3.1%, Hertz Global Holdings ( HTZ), up 0.9%, SBA Communications ( SBAC), up 0.6% and Fidelity National Information Services ( FIS), up 0.5%. TheStreet would like to highlight 5 stocks pushing the industry lower today: 5. CoStar Group ( CSGP) is one of the companies pushing the Diversified Services industry lower today. As of noon trading, CoStar Group is down $1.36 (-0.8%) to $168.73 on light volume. Thus far, 26,008 shares of CoStar Group exchanged hands as compared to its average daily volume of 116,000 shares. The stock has ranged in price between $168.64-$170.90 after having opened the day at $169.96 as compared to the previous trading day's close of $170.09. CoStar Group, Inc. provides information, analytics, and marketing services to the commercial real estate industry in the United States, the United Kingdom, and France. CoStar Group has a market cap of $4.8 billion and is part of the financial sector. Shares are up 89.5% year to date as of the close of trading on Wednesday. Currently there are 4 analysts that rate CoStar Group a buy, no analysts rate it a sell, and 2 rate it a hold. TheStreet Ratings rates CoStar Group as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures, compelling growth in net income, good cash flow from operations and expanding profit margins. Although the company may harbor some minor weaknesses, we feel they are unlikely to have a significant impact on results. Get the full CoStar 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.