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) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. 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’s (SIG) ratings are up from a C last week to a B. Signet Jewelers is engaged in the retailing of jewelry, watches and gifts with branches throughout UK and US. Shares of the stock have been trading at an exceptionally rapid pace, up fourfold from the week prior. For more information, get Portfolio Grader’s complete analysis of SIG stock.

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

The rating of Tractor Supply Company (TSCO) moves up this week, rising from a C to a B. 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.