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.

MicroVision, Inc. (MVIS) develops miniature display and imaging engines based on an integrated photonics module (IPM) in the United States and internationally. MVIS also gets F’s in Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of MVIS stock.

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

DNOW gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Operating Margin Growth and Sales Growth as well. For more information, get Portfolio Grader’s complete analysis of DNOW 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 6.1% since January 1. This is worse than the S&P 500, which has remained flat. The stock’s trailing PE Ratio is 104.50. For more information, get Portfolio Grader’s complete analysis of CRR 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.