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

NAO gets F’s in Analyst Earnings Revisions and Cash Flow as well. For more information, get Portfolio Grader’s complete analysis of NAO stock.

FBIO also gets F’s in Equity and Cash Flow. For more information, get Portfolio Grader’s complete analysis of FBIO stock.

CARBO Ceramics (CRR) manufactures and supplies resin-coated ceramic and resin-coated sand proppants primarily used in the hydraulic fracturing of natural gas and oil wells in the United States and internationally. CRR gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Cash Flow and Sales Growth as well. The stock currently has a trailing PE Ratio of 106.90. For more information, get Portfolio Grader’s complete analysis of CRR stock.

POSCO Sponsored ADR (PKX) produces hot rolled steel, cold rolled steel, stainless steel, and other forms of steel. PKX also gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions and Sales Growth. Since January 1, PKX has fallen 11%. This is worse than the S&P 500, which has remained flat. The stock’s trailing PE Ratio is 37.20. For more information, get Portfolio Grader’s complete analysis of PKX stock.

MGM Resorts (MGM) operates gaming, hospitality and entertainment resorts. MGM gets F’s in Earnings Momentum and Analyst Earnings Revisions as well. Shares of the stock have declined 3.9% since January 1. For more information, get Portfolio Grader’s complete analysis of MGM 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.