The grades of four specialty retail stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, Williams-Sonoma, Inc. (WSM) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). 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 is a strong week for Signet Jewelers Limited (SIG). The company’s rating climbs to B from the previous week’s C. 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. (GPS) is seeing ratings go up from a C last week to a B this week. 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.