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”).

Williams-Sonoma, Inc.’s (WSM) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). 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. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of WSM stock.

Signet Jewelers Limited (SIG) boosts its rating from a C to a B this week. 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.

This week, Gap, Inc.’s (GPS) ratings are up from a C last week to a B. 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’s (TSCO) ratings are looking better this week, moving up to a B from last week’s C. 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.