This week, the overall grades of seven software stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Workday, Inc. Class A (WDAY) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Workday provides software-as-a-service solutions for managing global businesses, combining a lower cost of ownership with an innovative approach to business applications. For Portfolio Grader’s specific subcategory of Equity, WDAY also gets an F. To get an in-depth look at WDAY, get Portfolio Grader’s complete analysis of WDAY stock.

The rating of SRS Labs (SRSL) declines this week from a C to a D. SRS Labs develops and licenses audio and voice enhancement technologies. The stock gets F’s in Earnings Growth and Margin Growth. For more information, get Portfolio Grader’s complete analysis of SRSL stock.

PROS Holdings, Inc. (PRO) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). PROS Holdings provides software applications and solutions for manufacturing, distribution, services, and travel industries worldwide. The stock gets F’s in Earnings Growth, Equity and Margin Growth. To get an in-depth look at PRO, get Portfolio Grader’s complete analysis of PRO stock.

Solera Holdings, Inc.’s (SLH) rating weakens this week, dropping to an F versus last week’s D. Solera Holdings provides software and services to the automobile insurance claims processing industry. The stock also rates an F in Margin Growth. The stock’s trailing PE Ratio is 82.10. For more information, get Portfolio Grader’s complete analysis of SLH stock.

Slipping from a C to a D rating, Rovi Corporation (ROVI) takes a hit this week. Rovi focuses on powering the discovery and consumption of digital entertainment with integrated solutions such as program guides, media recognition technologies, and content protection technologies. The stock gets F’s in Earnings Growth, Earnings Momentum and Margin Growth. To get an in-depth look at ROVI, get Portfolio Grader’s complete analysis of ROVI stock.

Tangoe, Inc. (TNGO) is having a tough week. The company’s rating falls from a D to an F. Tangoe provides communications lifecycle management software and services primarily to commercial enterprises and governmental agencies. The stock gets F’s in Earnings Growth and Margin Growth. As of Feb. 11, 2015, 11.1% of outstanding Tangoe, Inc. shares were held short. The stock currently has a trailing PE Ratio of 232.00. For more information, get Portfolio Grader’s complete analysis of TNGO stock.

This is a rough week for Imperva, Inc. (IMPV). The company’s rating falls to D from the previous week’s C. Imperva engages in the development, marketing, sale, service, and support of business security solutions that provide visibility and control over high value business data across critical systems within the data center. The stock gets F’s in Earnings Revisions and Equity. To get an in-depth look at IMPV, get Portfolio Grader’s complete analysis of IMPV 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.