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

SRS Labs’ (SRSL) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. SRS Labs develops and licenses audio and voice enhancement technologies. In Portfolio Grader’s specific subcategories of Earnings Growth and Margin Growth, SRSL also gets F’s. For more information, get Portfolio Grader’s complete analysis of SRSL stock.

Monotype Imaging Holdings (TYPE) is having a tough week. The company’s rating falls from a C to a D. Monotype Imaging Holdings is a global provider of text imaging solutions for printing digital text. The stock currently has a trailing PE Ratio of 37.70. To get an in-depth look at TYPE, get Portfolio Grader’s complete analysis of TYPE stock.

The rating of Nuance Communications, Inc. (NUAN) slips from a C to a D. Nuance Communications provides voice and language solutions for businesses and consumers worldwide. For more information, get Portfolio Grader’s complete analysis of NUAN stock.

This week, Changyou.com Ltd. Sponsored ADR Class A (CYOU) drops from a C to a D rating. Changyou.com develops and operates online games in China. The stock gets F’s in Earnings Growth, Earnings Momentum and Margin Growth. The stock has a trailing PE Ratio of 49.10. To get an in-depth look at CYOU, get Portfolio Grader’s complete analysis of CYOU 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.