The overall ratings of 4 Software stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Mobileye N.V. (MBLY) slips from a C to a D this week. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of MBLY stock.

Monotype Imaging Holdings Inc. (TYPE) declines this week from a C to a D. Monotype Imaging Holdings Inc. is a global provider of text imaging solutions for printing digital text. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of TYPE stock.

Zix Corporation (ZIXI) earns a D this week, moving down from last week’s grade of C. Zix Corporation provides secure, Internet-based applications in a Software-as-a-Service (SaaS) model. For more information, get Portfolio Grader’s complete analysis of ZIXI stock.

Sky-mobi Ltd. Sponsored ADR (MOBI) experiences a ratings drop this week, going from last week’s D to a F. Sky-mobi Ltd. Sponsored ADR engages in the operation of a mobile application platform embedded on mobile phones to provide mobile application store and services in the People’s Republic of China. The company also gets F’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of MOBI 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.