This week, 15 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 4,157 stocks and only these 15 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.

AVX (NYSE:AVX) is a worldwide manufacturer and supplier of passive electronic components, such as film capacitors and filters, and related products. The price of AVX is down 18.4% since the first of the year. This is worse than the S&P 500, which has seen a 16.1% increase over the same period. For more information, get Portfolio Grader’s complete analysis of AVX stock.

Braskem (NYSE:BAK) produces and sells basic petrochemicals and thermoplastic resins in Brazil and internationally. For more information, get Portfolio Grader’s complete analysis of BAK stock.

Century Aluminum (NASDAQ:CENX) produces primary aluminum, which is an internationally traded commodity. The price of CENX has slipped 6.6% since the start of the year. For more information, get Portfolio Grader’s complete analysis of CENX 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 tumbled 34.8%. As of Sept. 14, 22.3% 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 January 1, HBM has slumped 0.8%. For more information, get Portfolio Grader’s complete analysis of HBM stock.

International Rectifier (NYSE:IRF) is engaged in the design, manufacture, and marketing of power management semiconductors. Since the start of the year, IRF has declined 3.8%. For more information, get Portfolio Grader’s complete analysis of IRF stock.

Quicksilver Resources (NYSE:KWK) is involved in the acquisition, development, exploration, production, and sale of natural gas and crude oil. Shares of KWK have seen a 36.7% drop since January 1. As of Sept. 14, 16.9% of outstanding Quicksilver Resources shares were held short. For more information, get Portfolio Grader’s complete analysis of KWK stock.

NII Holdings (NASDAQ:NIHD) provides mobile communications for business customers in Latin America. Since the first of the year, NIHD has dropped 69.2%. As of Sept. 14, 26.9% 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 have slipped 24.4% since the first of the year. As of Sept. 14, 10.4% 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. Since the first of the year, SM has slid 23.6%. 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. The price of TAC is down 28.7% since the first of the year. For more information, get Portfolio Grader’s complete analysis of TAC stock.

Thompson Creek Metals (NYSE:TC) is an integrated North American primary producer of molybdenum. The price of TC is 49.4% lower than at the first of the year. As of Sept. 14, 12.1% of outstanding Thompson Creek Metals shares were held short. For more information, get Portfolio Grader’s complete analysis of TC stock.

Take-Two Interactive Software (NASDAQ:TTWO) publishes, develops and distributes interactive entertainment software and hardware. Shares of TTWO are trading 21.1% lower than at the start of the year. As of Sept. 14, 18.1% of outstanding Take-Two Interactive Software shares were held short. For more information, get Portfolio Grader’s complete analysis of TTWO 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.