This week, the ratings of 13 Software stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Red Hat, Inc. (RHT) earns a D this week, moving down from last week’s grade of C. Red Hat, Inc. provides open source software solutions that customers are allowed to update, monitor and manage. For more information, get Portfolio Grader’s complete analysis of RHT stock.

ACI Worldwide, Inc. (ACIW) is having a tough week. The company’s rating falls 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, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of ACIW stock.

Callidus Software Inc. (CALD) experiences a ratings drop this week, going from last week’s C to a D. Callidus Software Inc. provides sales performance management (SPM) software applications and services. For more information, get Portfolio Grader’s complete analysis of CALD stock.

This week, Workiva, Inc. Class A (WK) drops from a C to a D rating. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of WK stock.

Rapid7 Inc. (RPD) gets weaker ratings this week as last week’s C drops to a D. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of RPD stock.

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

This is a rough week for Cheetah Mobile, Inc. ADR Class A (CMCM). The company’s rating falls to F from the previous week’s D. The company also gets F’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of CMCM stock.

Slipping from a C to a D rating, Rosetta Stone Inc. (RST) takes a hit this week. Rosetta Stone Inc. develops, markets, and sells language learning solutions consisting of software, online services and audio practice tools primarily under our Rosetta Stone brand. The company also gets F’s in earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of RST stock.

TeleNav, Inc. (TNAV) slips from a D to a F this week. TeleNav, Inc. provides personalized mobile navigation service in the United States and internationally. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of TNAV stock.

Attunity Ltd (ATTU) declines this week from a D to a F. Attunity Ltd provides information availability software solutions for real-time data integration, application release automation, and managed file transfer. 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 ATTU stock.

Sky-mobi Ltd. Sponsored ADR’s (MOBI) rating weakens this week, dropping to a F versus last week’s D. 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.

Glu Mobile Inc. (GLUU) declines this week from a D to a F. Glu Mobile Inc. develops and publishes mobile games on a global basis. The company also gets F’s in sales growth, operating margin growth, earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of GLUU stock.

Smith Micro Software, Inc. (SMSI) experiences a ratings drop this week, going from last week’s D to a F. Smith Micro Software, Inc. is engaged in designing, developing and marketing software products and services mainly for the mobile industry. The company also gets F’s in sales growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SMSI 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.