Four Specialty Retail stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

GNC Holdings (NYSE:GNC) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. GNC Holdings operates a chain of health and wellness stores throughout the United States and internationally. In Portfolio Grader’s specific subcategories of Equity and Margin Growth, GNC also gets A’s. For more information, get Portfolio Grader’s complete analysis of GNC stock.

The rating of Francesca’s Holdings Corp. (NASDAQ:FRAN) moves up this week, rising from a C to a B. Francescas is a womens clothing boutique specializing in trendy clothes, handbags, shoes, jewelry, & gifts. For more information, get Portfolio Grader’s complete analysis of FRAN stock.

Pier 1 Imports (NYSE:PIR) earns a B this week, jumping up from last week’s grade of C. Pier 1 Imports retails decorative home furnishings, gifts, and related items. For more information, get Portfolio Grader’s complete analysis of PIR stock.

Vitamin Shoppe (NYSE:VSI) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Vitamin Shoppe is a specialty retailer and marketer of nutritional products. For more information, get Portfolio Grader’s complete analysis of VSI 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.