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

Slipping from a C to a D rating, Cerner Corporation (CERN) takes a hit this week. Cerner Corporation designs, markets, and installs healthcare information technology, healthcare devices, and content solutions. For more information, get Portfolio Grader’s complete analysis of CERN stock.

Simulations Plus, Inc. (SLP) is having a tough week. The company’s rating falls from a C to a D. Simulations Plus, Inc. designs and develops pharmaceutical simulation software to promote cost-effective solutions to a number of problems in pharmaceutical research and in the education of pharmacy and medical students. For more information, get Portfolio Grader’s complete analysis of SLP stock.

This week, Castlight Health, Inc. Class B (CSLT) drops from a C to a D rating. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CSLT 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.