This week, the overall grades of 6 Software stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Bottomline Technologies (de), Inc.’s (EPAY) rating worsens to a F from the company’s D rating a week ago. Bottomline Technologies (de), Inc. provides electronic payment, invoice, and document automation solutions. For more information, get Portfolio Grader’s complete analysis of EPAY stock.

ACI Worldwide, Inc. (ACIW) declines this week from a D to a F. ACI Worldwide, Inc. develops, markets, installs, and provides support for a line of products and services that facilitate electronic payments. The company also gets F’s in sales growth, earnings growth, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ACIW stock.

Model N, Inc. (MODN) slips from a C to a D this week. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of MODN stock.

Park City Group, Inc. (PCYG) is having a tough week. The company’s rating falls from a D to a F. Park City Group, Inc. provides software and consulting services for business productivity. For more information, get Portfolio Grader’s complete analysis of PCYG stock.

TubeMogul, Inc. (TUBE) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of TUBE stock.

Top Image Systems Ltd. (TISA) gets weaker ratings this week as last week’s D drops to a F. Top Image Systems Ltd. develops and markets automated data capture solutions for managing and validating content gathered from customers, trading partners, and employees. The company also gets F’s in sales growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TISA 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.