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

NII Holdings Inc (NIHD) provides mobile communications for business customers in Latin America. The company also gets F’s in sales growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NIHD stock.

Cresud SA Sponsored ADR (CRESY) is an agricultural company that makes basic agricultural commodities. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of CRESY stock.

FelCor Lodging Trust Incorporated (FCH) is a real estate investment trust focusing on upscale and full service hotels. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of FCH stock.

Retrophin, Inc.. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of RTRX stock.

Groupon, Inc. (GRPN) is a local e-commerce marketplace that connects merchants to consumers by offering goods and services at a discount. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of GRPN 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.