This week, four pharmaceutical stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

NuPathe Inc. (PATH) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. NuPathe develops pharmaceutical products used for the treatment and management of neurological and psychiatric diseases. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Revisions, PATH also gets A’s. For more information, get Portfolio Grader’s complete analysis of PATH stock.

This week, Watson Pharmaceuticals (WPI) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Watson develops, manufactures, markets, sells and distributes pharmaceutical products. For more information, get Portfolio Grader’s complete analysis of WPI stock.

This week, Impax Laboratories, Inc.’s (IPXL) ratings are up from a C last week to a B. Impax Laboratories develops, manufactures, and markets both proprietary and multi-source pharmaceutical products utilizing its drug delivery technologies. For more information, get Portfolio Grader’s complete analysis of IPXL stock.

The rating of Mylan (MYL) moves up this week, rising from a B to an A. Mylan is a global generic and specialty pharmaceuticals company. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. For more information, get Portfolio Grader’s complete analysis of MYL 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.