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 55 points (0.3%) at 16,661 as of Tuesday, May 27, 2014, 12:55 PM ET. The NYSE advances/declines ratio sits at 1,943 issues advancing vs. 1,024 declining with 173 unchanged. The Services sector currently sits up 1.0% versus the S&P 500, which is up 0.5%. On the negative front, top decliners within the sector include LATAM Airlines Group ( LFL), down 2.5%, Companhia Brasileira De Distribuicao ( CBD), down 2.1%, AutoZone ( AZO), down 2.0%, Advance Auto Parts ( AAP), down 1.4% and Amazon.com ( AMZN), down 1.4%. Top gainers within the sector include Moody's Corporation ( MCO), up 3.5%, Chipotle Mexican Grill ( CMG), up 3.1%, Expedia ( EXPE), up 2.6%, Melco Crown Entertainment ( MPEL), up 2.2% and Rite Aid ( RAD), up 2.2%. TheStreet would like to highlight 3 stocks pushing the sector lower today: 3. YY ( YY) is one of the companies pushing the Services sector lower today. As of noon trading, YY is down $2.61 (-4.1%) to $60.76 on heavy volume. Thus far, 2.4 million shares of YY exchanged hands as compared to its average daily volume of 2.8 million shares. The stock has ranged in price between $60.27-$64.95 after having opened the day at $62.40 as compared to the previous trading day's close of $63.37. YY Inc., through its subsidiaries, operates an online social platform in the People's Republic of China. YY has a market cap of $3.5 billion and is part of the internet industry. Shares are up 26.0% year-to-date as of the close of trading on Friday. Currently there are 5 analysts that rate YY a buy, no analysts rate it a sell, and none rate it a hold. TheStreet Ratings rates YY as a hold. The company's strengths can be seen in multiple areas, such as its notable return on equity, robust revenue growth and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we find that the stock itself is trading at a premium valuation. Get the full YY 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.