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

Neonode Inc. (NEON) develops and licenses user interfaces and optical multi-touch solutions for consumer brands. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of NEON stock.

CUI Global, Inc. (CUI) invests in technology companies. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of CUI stock.

Gafisa S.A. Sponsored ADR (GFA) is engaged in the development of residential buildings, land subdivisions and affordable entry-level housing. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of GFA stock.

North American Energy Partners Inc. (NOA) is a resource services provider to oil and natural gas, and other natural resource companies, with a primary focus in the Canadian oil sands. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of NOA stock.

RigNet, Inc. (RNET) is a data network infrastructure provider serving the remote communications needs of the oil and gas industry. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of RNET 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.