The grades of three grocery and staples retail 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.

Susser Holdings Corporation (SUSS) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Susser Holdings is a convenience store operator and a non-refining wholesale gasoline distributor. In Portfolio Grader’s specific subcategory of Earnings Growth, SUSS also gets an A. For more information, get Portfolio Grader’s complete analysis of SUSS stock.

The Kroger Co. (KR) improves from a C to a B rating this week. Kroger operates supermarkets and convenience stores in the United States. For more information, get Portfolio Grader’s complete analysis of KR stock.

China Nepstar Chain Drugstore Ltd. Sponsored ADR’s (NPD) ratings are looking better this week, moving up to a B from last week’s C. China Nepstar Chain Drugstore operates retail drugstores in the People’s Republic of China. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of NPD 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.