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”).

CVS Health Corporation’s (CVS) rating weakens this week, dropping to a D versus last week’s C. 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.

Whole Foods Market, Inc. (WFM) slips from a C to a D this week. Whole Foods Market, Inc. is a natural and organic foods supermarket with stores in the United States, Canada and the United Kingdom. For more information, get Portfolio Grader’s complete analysis of WFM stock.

This week, Natural Grocers by Vitamin Cottage, Inc. (NGVC) drops from a D to a F rating. Natural Grocers by Vitamin Cottage, Inc. operates natural and organic grocery and dietary supplement stores in the United States. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of NGVC stock.

Slipping from a C to a D rating, G. Willi Food International Ltd. (WILC) takes a hit this week. G. Willi Food International Ltd. imports, markets, and distributes food products, including canned vegetables, packaged fruit, pickled vegetables, canned and frozen fish, edible oil, dried fruit and nuts, coffee creamers, pasta, and pastries. For more information, get Portfolio Grader’s complete analysis of WILC 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.