This week, the ratings of 3 Diversified Consumer Services stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Graham Holdings Co.’s (GHC) rating weakens this week, dropping to a F versus last week’s D. Graham Holdings Co. is a diversified education and media company whose principal operations include educational services, newspaper print and online publishing, television broadcasting and cable television systems. The company also gets F’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of GHC stock.

Grand Canyon Education, Inc. (LOPE) is having a tough week. The company’s rating falls from a C to a D. Grand Canyon Education, Inc. provides online post-secondary education services. For more information, get Portfolio Grader’s complete analysis of LOPE stock.

ServiceMaster Global Holdings, Inc. (SERV) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in earnings growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SERV 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.