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

TransAlta (NYSE:TAC) operates as a wholesale power generator and marketer in Canada, the United States and Australia. TAC also gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow, Operating Margin Growth, and Sales Growth. The price of TAC is down 22.8% since the first of the year. This is worse than the S&P 500, which has seen a 11.7% increase over the same period. For more information, get Portfolio Grader’s complete analysis of TAC stock.

Boston Scientific (NYSE:BSX) is a developer, manufacturer and marketer of medical devices that are used in a range of interventional medical specialties. BSX gets F’s in Earnings Momentum, Cash Flow, Operating Margin Growth, and Sales Growth as well. For more information, get Portfolio Grader’s complete analysis of BSX stock.

Aeroflex (NYSE:ARX) engages in the design, engineering, manufacture, and sale of microelectronic products, and test and measurement equipment. ARX also gets F’s in Earnings Surprises, Equity, Operating Margin Growth, and Sales Growth. The price of ARX is down 43.4% since the first of the year. For more information, get Portfolio Grader’s complete analysis of ARX stock.

Casella Waste Systems (NASDAQ:CWST) provides resource management expertise and services related to solid waste collection, transfer, disposal, and recycling to residential, commercial, municipal, and industrial customers. CWST gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity, and Cash Flow as well. Shares of the stock have declined 34.4% since January 1. For more information, get Portfolio Grader’s complete analysis of CWST stock.

PetroQuest Energy (NYSE:PQ) explores, develops, acquires, and operates oil and gas properties onshore and offshore in the Gulf Coast Region. PQ gets F’s in Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow, Operating Margin Growth, and Sales Growth as well. Since January 1, PQ has fallen 5.2%. For more information, get Portfolio Grader’s complete analysis of PQ 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.