The overall ratings of 4 Food & Staples Retailing stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Costco Wholesale Corporation (COST) gets weaker ratings this week as last week’s C drops to a D. Costco Wholesale Corporation operates membership warehouses that offer low prices on a limited selection of nationally branded and select private label products in a range of merchandise categories. For more information, get Portfolio Grader’s complete analysis of COST stock.

Slipping from a D to a F rating, CVS Health Corporation (CVS) takes a hit this week. CVS Health Corporation is a pharmacy health care provider in the United States. For more information, get Portfolio Grader’s complete analysis of CVS stock.

Smart & Final Stores, Inc. (SFS) experiences a ratings drop this week, going from last week’s D to a F. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of SFS stock.

China Jo-Jo Drugstores, Inc. (CJJD) slips from a C to a D this week. China Jo-Jo Drugstores, Inc. owns and operates a retail pharmacy chain in the People’s Republic of China. The company also gets F’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of CJJD 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.