Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model All three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 47 points (0.3%) at 15,382 as of Tuesday, May 21, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 1,570 issues advancing vs. 1,367 declining with 136 unchanged. The Services sector currently sits up 0.5% versus the S&P 500, which is up 0.2%. On the negative front, top decliners within the sector include Alaska Air Group ( ALK), down 3.72, United Continental Holdings ( UAL), down 2.32, Delta Air Lines ( DAL), down 1.66, Netflix ( NFLX), down 1.59 and Priceline.com ( PCLN), down 0.71. Top gainers within the sector include Liberty Media Corporation ( LMCA), up 13.7%, AutoZone ( AZO), up 6.1%, Shaw Communications ( SJR), up 4.8%, Luxottica Group ( LUX), up 2.6% and CH Robinson Worldwide ( CHRW), up 2.4%. TheStreet Ratings group would like to highlight 4 stocks pushing the sector lower today: 4. Grupo Televisa S.A ( TV) is one of the companies pushing the Services sector lower today. As of noon trading, Grupo Televisa S.A is down $0.71 (-2.6%) to $26.29 on average volume Thus far, 1.1 million shares of Grupo Televisa S.A exchanged hands as compared to its average daily volume of 1.7 million shares. The stock has ranged in price between $26.21-$26.96 after having opened the day at $26.92 as compared to the previous trading day's close of $27.00. Grupo Televisa, S.A.B. operates as a media company. Grupo Televisa S.A has a market cap of $15.3 billion and is part of the media industry. The company has a P/E ratio of 21.2, above the S&P 500 P/E ratio of 17.7. Shares are up 1.6% year to date as of the close of trading on Monday. TheStreet Ratings rates Grupo Televisa S.A 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, expanding profit margins and notable return on equity. We feel these strengths outweigh the fact that the company shows weak operating cash flow. Get the full Grupo Televisa S.A Ratings Report now. Exclusive Offer: Jim Cramer's 'go-to' small/mid-cap guru Bryan Ashenberg only buys stocks he thinks could return 50-100%. See his top picks for 14-days FREE.