The grades of 4 Food & Staples Retailing stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Kroger Co. (KR) earns a A this week, jumping up from last week’s grade of B. Kroger Co. operates supermarkets and convenience stores in the United States. The company also gets A’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of KR stock.

SpartanNash Company’s (SPTN) ratings are looking better this week, moving up to a B from last week’s C. SpartanNash Company is a regional grocery distributor and grocery retailer that operates largely in Michigan and Indiana. The company also gets A’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of SPTN stock.

Village Super Market, Inc. Class A (VLGEA) improves from a C to a B rating this week. Village Super Market, Inc. Class A operates a chain of ShopRite supermarkets in northern and southern New Jersey, and northeastern Pennsylvania. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of VLGEA stock.

This week, Chefs’ Warehouse, Inc. (CHEF) pushes up from a C to a B rating. Chefs’ Warehouse, Inc. is a distributor of specialty food products in the United States. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of CHEF 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.