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

Navistar (NYSE:NAV) manufactures and markets medium and heavy trucks, school buses, mid-range diesel engines, and service parts. NAV also gets F’s in Earnings Growth, Analyst Earnings Revisions, Cash Flow, and Operating Margin Growth. Since January 1, NAV has fallen 47.2%. This is worse than the S&P 500, which has seen a 9.3% increase over the same period. The stock’s trailing PE Ratio is 153.90. For more information, get Portfolio Grader’s complete analysis of NAV stock.

ESSA Bancorp (NASDAQ:ESSA) provides to individuals, families, and businesses in Pennsylvania a range of financial services, including savings accounts, checking accounts, money market accounts and other qualified plan accounts. ESSA also gets an F in Sales Growth. Since January 1, ESSA has fallen 4.8%. The stock has a trailing PE Ratio of 497.00. For more information, get Portfolio Grader’s complete analysis of ESSA stock.

RealD Inc. (NYSE:RLD) is a global licensor of 3D technologies. RLD also gets F’s in Earnings Growth, Analyst Earnings Revisions, and Sales Growth. The stock currently has a trailing PE Ratio of 77.80. For more information, get Portfolio Grader’s complete analysis of RLD stock.

Leap Wireless (NASDAQ:LEAP) provides mobile wireless services. LEAP gets F’s in Equity and Cash Flow as well. The price of LEAP is down 35.5% since the first of the year. For more information, get Portfolio Grader’s complete analysis of LEAP stock.

Thompson Creek Metals (NYSE:TC) is an integrated North American primary producer of molybdenum. TC gets F’s in Earnings Growth, Analyst Earnings Revisions, Cash Flow, Operating Margin Growth, and Sales Growth as well. Shares of the stock have declined 57.2% since January 1. For more information, get Portfolio Grader’s complete analysis of TC 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.