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

Taomee Holdings Ltd. Sponsored ADR (TAOM) produces children’s entertainment. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of TAOM stock.

21Vianet Group, Inc. Sponsored ADR Class A (VNET) provides carrier-neutral Internet data center services in the People’’s Republic of China. The company also gets F’s in earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of VNET stock.

Centrais Eletricas Brasileiras S.A. – Eletrobras Sponsored ADR Pfd Class B (EBR.B) generates, transmits, and markets electricity through regional companies in Brazil. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of EBR.B stock.

Centrais Eletricas Brasileiras S.A. – Eletrobras Sponsored ADR (EBR) is a utility company which operates as a generator, transmitter, and distributor of power. The company also gets F’s in sales growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of EBR stock.

RealD Inc. (RLD) is a global licensor of 3D technologies. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of RLD 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.