This week, the ratings of five Software stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, SRS Labs (NASDAQ:SRSL) falls to a D (“sell”), worse than last week’s grade of C (“hold”). SRS Labs develops and licenses audio and voice enhancement technologies. In Portfolio Grader’s specific subcategories of Earnings Growth and Margin Growth, SRSL also gets F’s. To get an in-depth look at SRSL, get Portfolio Grader’s complete analysis of SRSL stock.

This is a rough week for FactSet (NYSE:FDS). The company’s rating falls to D from the previous week’s C. FactSet Research Systems supplies global economic and financial data to analysts, investment bankers, and other financial professionals. For a full analysis of FDS stock, visit Portfolio Grader.

Parametric Technology (NASDAQ:PMTC) earns a D this week, moving down from last week’s grade of C. Parametric Technology develops, markets, and supports integrated product development and processes lifecycle management solutions. The stock gets F’s in Earnings Growth, Earnings Momentum, and Margin Growth. For more information, get Portfolio Grader’s complete analysis of PMTC stock.

Ebix Inc. (NASDAQ:EBIX) earns a D this week, falling from last week’s grade of C. Ebix provides a series of application software products for the insurance industry, including carrier systems and agency systems. The stock price has fallen 25.6% over the past month, worse than the Nasdaq, which has held flat over the same period of time. As of Nov. 29, 2012, 28.8% of outstanding Ebix Inc. shares were held short. For a full analysis of EBIX stock, visit Portfolio Grader.

MicroStrategy Inc. (NASDAQ:MSTR) earns a F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). MicroStrategy provides business intelligence software that enables companies to report, analyze and monitor data. The stock gets F’s in Earnings Revisions and Earnings Surprise. Share prices fell 8.2% over the past month. The stock’s trailing PE Ratio is 45.40. For more information, get Portfolio Grader’s complete analysis of MSTR stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.