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

Fibria Celulose (NYSE:FBR) produces and exports wood-free printing, writing, and specialty papers. FBR also gets F’s in Earnings Growth, Equity, Cash Flow, Operating Margin Growth, and Sales Growth. For more information, get Portfolio Grader’s complete analysis of FBR stock.

Rentrak Corp. (NASDAQ:RENT) is an information management company serving the media, entertainment, retail, advertising and manufacturing industries. RENT also gets F’s in Earnings Growth and Equity. For more information, get Portfolio Grader’s complete analysis of RENT stock.

Westell Technologies (NASDAQ:WSTL) designs, manufactures, and distributes telecommunications products to telephone companies and other telecommunications service providers. WSTL gets F’s in Earnings Growth, Earnings Momentum, Equity, Operating Margin Growth, and Sales Growth as well. Since January 1, WSTL has fallen 4.5%. This is worse than the Nasdaq’s 18.4% increase for the same period. For more information, get Portfolio Grader’s complete analysis of WSTL stock.

Cal Dive (NYSE:DVR) is a marine contracting company that provides manned diving, pipelay and pipe burial, platform installation, and platform salvage services to the offshore oil and natural gas industry. DVR gets F’s in Earnings Momentum, Equity, and Cash Flow as well. Shares of the stock have declined 26.2% since January 1. For more information, get Portfolio Grader’s complete analysis of DVR 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.