The ratings of 17 Software stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Ultimate Software Group, Inc. (ULTI) slips from a C to a D this week. Ultimate Software Group, Inc. designs, develops, and markets unified HCM SaaS solutions for businesses. For more information, get Portfolio Grader’s complete analysis of ULTI stock.

Tyler Technologies, Inc. (TYL) experiences a ratings drop this week, going from last week’s C to a D. Tyler Technologies, Inc. provides integrated software systems and related services for local-government entities such as counties and schools. For more information, get Portfolio Grader’s complete analysis of TYL stock.

Workday, Inc. Class A (WDAY) declines this week from a C to a D. Workday, Inc. Class A provides software-as-a-service solutions for managing global businesses, combining a lower cost of ownership with an innovative approach to business applications. 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 WDAY stock.

Red Hat, Inc. (RHT) gets weaker ratings this week as last week’s C drops to a D. 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.

salesforce.com, inc. (CRM) is having a tough week. The company’s rating falls from a C to a D. Salesforce.com, inc. offers businesses a technology platform for Internet-based computing, storage, and connectivity solutions. For more information, get Portfolio Grader’s complete analysis of CRM stock.

Paylocity Holding Corp. (PCTY) earns a D this week, moving down from last week’s grade of B. For more information, get Portfolio Grader’s complete analysis of PCTY stock.

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

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

This is a rough week for Model N, Inc. (MODN). The company’s rating falls to D from the previous week’s C. The company also gets F’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of MODN stock.

This week, A10 Networks, Inc. (ATEN) 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 ATEN stock.

This week, MAM Software Group, Inc.’s (MAMS) rating worsens to a D from the company’s B rating a week ago. MAM Software Group, Inc. develops and markets computer software. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of MAMS stock.

This is a rough week for Attunity Ltd (ATTU). The company’s rating falls to F from the previous week’s D. 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.

This week, Evolving Systems, Inc.’s (EVOL) rating worsens to a F from the company’s D rating a week ago. Evolving Systems, Inc. is a software company providing business and operational support services and solutions to the telecommunications industry. For more information, get Portfolio Grader’s complete analysis of EVOL stock.

This week, FORM Holdings Corp. (FH) drops from a C to a D rating. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of FH stock.

Slipping from a D to a F rating, Sky-mobi Ltd. Sponsored ADR (MOBI) takes a hit this week. 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.

Covisint Corp. (COVS) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of COVS stock.

Glu Mobile Inc. (GLUU) is having a tough week. The company’s rating falls 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.

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.