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

This week, SRS Labs (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. For more information, get Portfolio Grader’s complete analysis of SRSL stock.

Model N, Inc. (MODN) earns a D this week, moving down from last week’s grade of C. The stock gets F’s in Earnings Growth, Equity and Sales Growth. To get an in-depth look at MODN, get Portfolio Grader’s complete analysis of MODN stock.

Actuate Corporation’s (BIRT) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Actuate provides software and services to develop and deploy Rich Information Applications. The stock gets F’s in Earnings Revisions, Earnings Surprise and Margin Growth. For more information, get Portfolio Grader’s complete analysis of BIRT stock.

Slipping from a D to an F rating, Sungy Mobile Limited. ADR Class A (GOMO) takes a hit this week. The stock gets F’s in Earnings Growth, Earnings Momentum, Earnings Revisions and Margin Growth. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. To get an in-depth look at GOMO, get Portfolio Grader’s complete analysis of GOMO 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.