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

CYNA gets F’s in Earnings Momentum and Equity as well. For more information, get Portfolio Grader’s complete analysis of CYNA 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 also gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Cash Flow and Sales Growth. Shares of the stock have declined 53% since January 1. This is worse than the S&P 500, which has remained flat. 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 gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions and Sales Growth as well. Shares of the stock have declined 45.1% since January 1. The stock’s trailing PE Ratio is 42.50. For more information, get Portfolio Grader’s complete analysis of PKX stock.

MGM Resorts (MGM) operates gaming, hospitality and entertainment resorts. MGM also gets F’s in Earnings Momentum and Analyst Earnings Revisions. The price of MGM is down 2.5% since the first of the year. For more information, get Portfolio Grader’s complete analysis of MGM stock.

Ellington Financial (EFC) acquires and manages mortgage-related assets. EFC gets F’s in Analyst Earnings Revisions and Sales Growth as well. Since January 1, EFC has fallen 14.1%. For more information, get Portfolio Grader’s complete analysis of EFC 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.