The overall ratings of nine software stocks are down on Portfolio Grader this week. 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. To get an in-depth look at SRSL, get Portfolio Grader’s complete analysis of SRSL stock.

Aspen Technology, Inc.’s (AZPN) rating weakens this week, dropping to a D versus last week’s C. Aspen Technology is a global provider of mission-critical process optimization software solutions, which are designed to manage and optimize plant and process design, operational performance, and supply chain planning. The trailing PE Ratio for the stock is 31.30. For more information, get Portfolio Grader’s complete analysis of AZPN stock.

The rating of Sapiens International Corp. NV (SPNS) declines this week from a C to a D. Sapiens International is a global provider of information technology solutions. The stock has a trailing PE Ratio of 25.20. To get an in-depth look at SPNS, get Portfolio Grader’s complete analysis of SPNS stock.

Kofax Ltd. (KFX) is having a tough week. The company’s rating falls from a C to a D. The stock also gets an F in Earnings Momentum. The trailing PE Ratio for the stock is 115.70. For more information, get Portfolio Grader’s complete analysis of KFX stock.

ClickSoftware (CKSW) earns a D this week, moving down from last week’s grade of C. ClickSoftware Technologies provides software products and solutions for workforce management and optimization for the service sector. The stock also gets an F in Earnings Revisions. To get an in-depth look at CKSW, get Portfolio Grader’s complete analysis of CKSW stock.

This week, PTC Inc. (PTC) drops from a C to a D rating. The stock’s trailing PE Ratio is 25.40. For more information, get Portfolio Grader’s complete analysis of PTC stock.

The rating of Rovi Corporation (ROVI) slips from a C to a D. 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.

Magic Software Enterprises’ (MGIC) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Magic Software develops, markets, and supports software development and deployment technology. The stock also rates an F in Earnings Surprise. For more information, get Portfolio Grader’s complete analysis of MGIC stock.

Citrix Systems, Inc.’s (CTXS) rating weakens this week, dropping to a D versus last week’s C. Citrix Systems designs, develops, and markets technology solutions to deliver information technology services on-demand worldwide. The stock currently has a trailing PE Ratio of 35.60. To get an in-depth look at CTXS, get Portfolio Grader’s complete analysis of CTXS 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.