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 down today with the Dow Jones Industrial Average ( ^DJI) trading down 6 points (0.0%) at 14,695 as of Friday, April 26, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 953 issues advancing vs. 1,941 declining with 134 unchanged. The Computer Software & Services industry currently sits down 0.09 versus the S&P 500, which is down 0.43. On the negative front, top decliners within the industry include Wipro ( WIT), down 1.55, Citrix Systems ( CTXS), down 1.66 and Accenture ( ACN), down 0.92. A company within the industry that increased today was Intuit ( INTU), up 2.82. TheStreet Ratings group would like to highlight 5 stocks pushing the industry lower today: 5. National Instruments Corporation ( NATI) is one of the companies pushing the Computer Software & Services industry lower today. As of noon trading, National Instruments Corporation is down $3.79 (-12.4%) to $26.65 on heavy volume Thus far, 1.9 million shares of National Instruments Corporation exchanged hands as compared to its average daily volume of 310,700 shares. The stock has ranged in price between $22.89-$27.77 after having opened the day at $22.96 as compared to the previous trading day's close of $30.44. National Instruments Corporation designs, manufactures, and sells tools to engineers and scientists worldwide. It offers LabVIEW, a system design software product for measurement and control; and LabVIEW Real-Time and LabVIEW FPGA that are strategic modular software add-ons. National Instruments Corporation has a market cap of $3.7 billion and is part of the technology sector. The company has a P/E ratio of 41.5, above the S&P 500 P/E ratio of 17.7. Shares are up 17.4% year to date as of the close of trading on Thursday. TheStreet Ratings rates National Instruments Corporation as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, expanding profit margins and increase in stock price during the past year. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity. Get the full National Instruments Corporation 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.