The grades of 6 Pharmaceuticals stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

ANI Pharmaceuticals, Inc. (ANIP) boosts its rating from a D to a B this week. ANI Pharmaceuticals, Inc. develops, manufactures, and markets prescription and over-the-counter pharmaceuticals. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ANIP stock.

The rating of Merck & Co., Inc. (MRK) moves up this week, rising from a C to a B. Merck & Co., Inc. is a global health care company that delivers health solutions through its prescription medicines, vaccines, biologic therapies, animal health, and consumer care products. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of MRK stock.

This week, Heska Corporation’s (HSKA) ratings are up from a B last week to a A. Heska Corporation discovers, develops, manufactures, and markets companion animal health products, primarily for dogs, cats, and horses. The company also gets A’s in operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of HSKA stock.

Relypsa, Inc. (RLYP) improves from a C to a B rating this week. For more information, get Portfolio Grader’s complete analysis of RLYP stock.

Cynapsus Therapeutics Inc. (CYNA) earns a B this week, jumping up from last week’s grade of C. The company also gets A’s in earnings revisions and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CYNA stock.

This is a strong week for Pain Therapeutics, Inc. (PTIE). The company’s rating climbs to A from the previous week’s B. Pain Therapeutics, Inc. develops safer or more efficacious drugs for use in pain management, particularly in the area of opioid painkillers. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of PTIE 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.