For the current week, the overall ratings of three commercial services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, NL Industries, Inc. (NL) falls to a D (“sell”), worse than last week’s grade of C (“hold”). NL Industries manufactures products that include security products, precision ball bearing slides and ergonomic computer support systems, as well as chemicals such as titanium dioxide pigments. NL also rates an F in Portfolio Grader’s specific subcategory of Equity. To get an in-depth look at NL, get Portfolio Grader’s complete analysis of NL stock.

Kimball International, Inc. Class B (KBAL) earns a D this week, moving down from last week’s grade of C. The stock also gets an F in Earnings Revisions. For more information, get Portfolio Grader’s complete analysis of KBAL stock.

Team, Inc. (TISI) is having a tough week. The company’s rating falls from a C to a D. Team is a provider of specialty maintenance and construction services required in maintaining high temperature and high pressure piping systems and vessels that are utilized in the refining, petrochemical, power, pipeline, and other heavy industries. The stock has a trailing PE Ratio of 25.50. To get an in-depth look at TISI, get Portfolio Grader’s complete analysis of TISI 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.