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

Ocean Rig UDW Inc (ORIG) engages in the provision of oilfields services. The company also gets A’s in operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of ORIG stock.

Pacific Drilling S.A. (PACD) an offshore drilling contractor, provides ultra-deepwater drilling services to the oil and natural gas industry through the use of drilling rigs. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of PACD stock.

North Atlantic Drilling Ltd.. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of NADL stock.

Delta Technology Holdings Ltd. The company also gets A’s in. For more information, get Portfolio Grader’s complete analysis of DELT stock.

Danaos Corporation (DAC) engages in the ownership and operation of containerships, as well as chartering of its vessels to liner companies in Greece and internationally. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of DAC 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.