For the current week, the overall ratings of three Software stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Rosetta Stone (NYSE:RST) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Rosetta Stone develops, markets, and sells language learning solutions consisting of software, online services and audio practice tools primarily under our Rosetta Stone brand. In Portfolio Grader’s specific subcategories of Earnings Revisions and Equity, RST also gets F’s. The stock price has dropped 14.2% over the past month, worse than the 3.8% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of RST stock.

FalconStor Software (NASDAQ:FALC) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). FalconStor Software provides a software-only storage networking solution that simplifies storage management. The stock gets F’s in Earnings Revisions, Equity, and Cash Flow. Share prices fell 21.2% over the past month. For a full analysis of FALC stock, visit Portfolio Grader.

Pegasystems (NASDAQ:PEGA) experiences a ratings drop this week, going from last week’s C to an F. Pegasystems develops customer relationship management software. The stock gets F’s in Earnings Growth, Earnings Momentum, and Earnings Surprise. The stock price has fallen 5.2% over the past month. The stock currently has a trailing PE Ratio of 115.6. To get an in-depth look at PEGA, get Portfolio Grader’s complete analysis of PEGA 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.