The ratings of four software stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

SRS Labs (SRSL) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. 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 a full analysis of SRSL stock, visit Portfolio Grader.

ePlus inc. (PLUS) experiences a ratings drop this week, going from last week’s C to a D. Eplus provides IT products and services, flexible leasing solutions, and enterprise supply management to enable its customers to optimize their IT infrastructure and supply chain processes. To get an in-depth look at PLUS, get Portfolio Grader’s complete analysis of PLUS stock.

Symantec Corporation (SYMC) gets weaker ratings this week as last week’s C drops to a D. Symantec provides information security, storage, and systems management solutions to businesses and consumers. The stock price has fallen 12.7% over the past month, worse than the 1.3% decrease the Nasdaq has seen over the same period of time. For a full analysis of SYMC stock, visit Portfolio Grader.

Compuware Corporation’s (CPWR) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Compuware provides software and web performance solutions and professional services to improve the performance of IT organizations. The stock also gets an F in Margin Growth. To get an in-depth look at CPWR, get Portfolio Grader’s complete analysis of CPWR 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.