This week, these five stocks have the best ratings in Earnings Revisions, one of the eight Fundamental Categories on Portfolio Grader.

BlackBerry Limited (BBRY) engages in the design, manufacture and marketing of wireless solutions worldwide. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of BBRY stock.

LMI Aerospace, Inc. (LMIA) fabricates, machines, finishes, and integrates formed, close tolerance aluminum and specialty alloy components for use by the aerospace industry. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of LMIA stock.

InterDigital, Inc. (IDCC) develops technology for advanced digital wireless telecommunications applications. The company also gets A’s in sales growth, operating margin growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of IDCC stock.

Stillwater Mining Company (SWC) is engaged in the development, extraction, processing, refining and marketing of palladium, platinum and associated metals from a geological formation in south central Montana known as the J-M Reef and from the recycling of spent catalytic converters. The company also gets A’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SWC stock.

Valero Energy Corporation (VLO) is an independent petroleum refiner and marketer. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of VLO 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.