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

Emerald Oil, Inc. (EOX) is an independent exploration and production oil company focused on developing oil wells. The company also gets F’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of EOX stock.

Halcon Resources Corporation (HK) an independent energy company, engages in the acquisition, production, exploration, and development of onshore oil and natural gas properties in the United States. The company also gets F’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of HK stock.

Centrus Energy Corp. Class A. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of LEU stock.

Alon Blue Square Israel Ltd. Sponsored ADR (BSI) operates supermarkets and retail outlets in Israel. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of BSI stock.

Natural Resource Partners L.P. (NRP) owns and manages coal properties in Appalachia, the Illinois Basin, and the Western United States. The company also gets F’s in operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NRP 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.