The grades of six 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.

This week, Lithia Motors (NYSE:LAD) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Lithia Motors retail sells new and used vehicles in the western United States. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Revisions, Margin Growth, and Sales Growth, LAD also gets A’s. The stock price has risen 7.2% over the past month, better than the 1.9% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of LAD stock.

The rating of Vitamin Shoppe (NYSE:VSI) moves up this week, rising from a B to an A. Vitamin Shoppe is a specialty retailer and marketer of nutritional products. Investors have pushed the stock price up 1.8% over the past month. For more information, get Portfolio Grader’s complete analysis of VSI stock.

Winmark (NASDAQ:WINA) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Winmark is a franchisor of four value-oriented retail store concepts that buy, sell, trade and consign merchandise. For more information, get Portfolio Grader’s complete analysis of WINA stock.

This week, Aeropostale‘s (NYSE:ARO) ratings are up from a C last week to a B. Aeropostale is a mall-based specialty retailer of casual apparel and accessories. Wall Street seems to agree with the upgrade and has propelled the stock up 9% over the past month. For more information, get Portfolio Grader’s complete analysis of ARO stock.

Signet Jewelers‘s (NYSE:SIG) ratings are looking better this week, moving up to a B from last week’s C. Signet Jewelers is engaged in retailing of jewelry, watches and gifts with branches throughout UK and US. Shares of the company are up 2.9% from last month. For more information, get Portfolio Grader’s complete analysis of SIG stock.

This week, Men’s Wearhouse (NYSE:MW) pushes up from a C to a B rating. Men’s Wearhouse sells suits, sportswear, furnishings, and accessories. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 25.8% over the past month. For more information, get Portfolio Grader’s complete analysis of MW 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.