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

RealD Inc. (RLD) is a global licensor of 3D technologies. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of RLD stock.

Gerdau S.A. Sponsored ADR Pfd (GGB) is a Brazilian corporation that produces crude steel and related products. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings revisions. For more information, get Portfolio Grader’s complete analysis of GGB stock.

Baker Hughes Incorporated (BHI) supplies products and technology services for the drilling and evaluation of oil and natural gas wells. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of BHI stock.

Parsley Energy, Inc. Class A. The company also gets F’s in sales growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PE stock.

Pioneer Natural Resources Company (PXD) explores for, develops, and produces oil and gas reserves. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PXD 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.