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

City Telecom (H.K.) Ltd. (CTEL) provides fixed telecommunications networks and international telecommunications services for residential and corporate customers. CTEL also gets F’s in Earnings Growth and Sales Growth. For more information, get Portfolio Grader’s complete analysis of CTEL stock.

Tower Group International Ltd. (TWGP) is a provider of property and casualty insurance products and services. TWGP also gets F’s in Earnings Momentum, Equity, Cash Flow and Sales Growth. Since January 1, TWGP has fallen 7.4%. This is worse than the Nasdaq, which has remained flat. For more information, get Portfolio Grader’s complete analysis of TWGP stock.

Tessera Technologies, Inc. (TSRA) invests in, licenses and delivers miniaturization technologies for electronic devices. TSRA also gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of TSRA stock.

Empire Resorts, Inc. (NYNY) is a gaming and resort management company. NYNY gets F’s in Earnings Growth and Equity as well. For more information, get Portfolio Grader’s complete analysis of NYNY stock.

Schnitzer Steel Industries, Inc. Class A (SCHN) is a recycler of ferrous and nonferrous scrap metal, a recycler of used and salvaged vehicles and a manufacturer of finished steel products. SCHN gets F’s in Earnings Momentum, Analyst Earnings Revisions and Cash Flow as well. Shares of the stock have declined 11.1% since January 1. For more information, get Portfolio Grader’s complete analysis of SCHN 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.