The grades of four specialty 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.

Williams-Sonoma, Inc. (WSM) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Williams-Sonoma is a retailer of home products, mainly culinary and serving equipment. In Portfolio Grader’s specific subcategory of Equity, WSM also gets an A. For more information, get Portfolio Grader’s complete analysis of WSM stock.

This week, Signet Jewelers Limited (SIG) pushes up from a C to a B rating. Signet Jewelers is engaged in the retailing of jewelry, watches and gifts with branches throughout UK and US. For more information, get Portfolio Grader’s complete analysis of SIG stock.

Gap, Inc.’s (GPS) ratings are looking better this week, moving up to a B from last week’s C. Gap is an international specialty retailer operating retail and outlet stores. For more information, get Portfolio Grader’s complete analysis of GPS stock.

Tractor Supply Company (TSCO) improves from a C to a B rating this week. Tractor Supply operates retail farm and ranch stores in the United States. For more information, get Portfolio Grader’s complete analysis of TSCO 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.