This week, 3 Software stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Imperva, Inc. (IMPV) gets weaker ratings this week as last week’s D drops to a F. Imperva, Inc. engages in the development, marketing, sale, service, and support of business security solutions that provide visibility and control over high value business data across critical systems within the data center. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, and return on equity. For more information, get Portfolio Grader’s complete analysis of IMPV stock.

Smith Micro Software, Inc. (SMSI) is having a tough week. The company’s rating falls from a C to a D. 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, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SMSI stock.

FORM Holdings Corp. (FH) experiences a ratings drop this week, going from last week’s D to a F. 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.

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.