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

BBRY also gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of BBRY stock.

Quiksilver, Inc. (ZQK) is an outdoor sports lifestyle company, which designs, produces and distributes a diversified mix of branded apparel, footwear, accessories, snowboards and related products. ZQK gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity and Sales Growth as well. For more information, get Portfolio Grader’s complete analysis of ZQK stock.

Rubicon Technology, Inc. (RBCN) is an electronic materials provider that develops, manufactures and sells monocrystalline sapphire and other innovative crystalline products for LEDs, RFICs, blue laser diodes, optoelectronics and other optical applications. RBCN gets F’s in Analyst Earnings Revisions, Equity and Sales Growth as well. For more information, get Portfolio Grader’s complete analysis of RBCN stock.

GT Advanced Technologies (GTAT) manufactures solar power equipment. GTAT gets F’s in Analyst Earnings Revisions, Equity, Cash Flow, Operating Margin Growth and Sales Growth as well. For more information, get Portfolio Grader’s complete analysis of GTAT stock.

LTX-Credence Corporation (LTXC) designs, manufactures, and markets automatic test equipment for the semiconductor industry. LTXC also gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity and Sales Growth. For more information, get Portfolio Grader’s complete analysis of LTXC 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.