This week, nine stocks get F’s (“strong strong”) in Portfolio Grader‘s three main grading categories, Total Grade, Overall Fundamental Grade, and Quantitative Grade.

These are the worst of the worst in the entire Portfolio Grader database. This week, there are 4,160 stocks and only these nine get failing marks in all categories to make the dreaded “Triple F” stocks list. Here they are:

Aixtron (NASDAQ:AIXG) provides deposition equipment, such as that used in lighting, fiber optic communication systems, and mobile telephone applications, to the semiconductor industry. For more information, get Portfolio Grader’s complete analysis of AIXG stock.

Braskem (NYSE:BAK) produces and sells basic petrochemicals and thermoplastic resins in Brazil and internationally. The stock’s trailing PE Ratio is 61.1. Shares of the company are down 0.5% from the start of the year. This is worse than the S&P 500’s 11.5% increase for the same period. For more information, get Portfolio Grader’s complete analysis of BAK stock.

Fibria Celulose (NYSE:FBR) produces and exports wood-free printing, writing, and specialty papers. For more information, get Portfolio Grader’s complete analysis of FBR stock.

Forest Oil (NYSE:FST) is involved in the acquisition, exploration, development, production, and marketing of natural gas and crude oil in North American and international locations. Since January 1, FST has slumped 45.6%. As of Aug. 24, 22% of outstanding Forest Oil shares were held short. For more information, get Portfolio Grader’s complete analysis of FST stock.

HudBay Minerals (NYSE:HBM) is a mining company that mines and produces zinc, copper, gold, and silver. Since the first of the year, HBM has dropped 13.2%. For more information, get Portfolio Grader’s complete analysis of HBM stock.

NII Holdings (NASDAQ:NIHD) provides mobile communications for business customers in Latin America. Shares of NIHD have seen a 70.8% drop since January 1. As of Aug. 24, 23.4% of outstanding NII Holdings shares were held short. For more information, get Portfolio Grader’s complete analysis of NIHD stock.

Swift Energy (NYSE:SFY) develops, explores, acquires and operates oil and natural gas properties, primarily those that are onshore and in the inland waters of Louisiana and Texas. Shares of SFY stock have fallen 29.7% since January 1. As of Aug. 24, 10.1% of outstanding Swift Energy shares were held short. For more information, get Portfolio Grader’s complete analysis of SFY stock.

SM Energy (NYSE:SM) is an independent energy company that explores, exploits, develops, acquires and produces natural gas and crude oil in the United States. Shares of SM have slipped 36.8% since the first of the year. For more information, get Portfolio Grader’s complete analysis of SM stock.

TransAlta (NYSE:TAC) operates as a wholesale power generator and marketer in Canada, the United States and Australia. Shares of TAC are trading 23.3% lower than at the start of the year. For more information, get Portfolio Grader’s complete analysis of TAC 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.