This week, seven stocks get F’s (“strong sell”) 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 4,315 stocks and only these seven get failing marks in all categories to make the dreaded “Triple F” stocks list. Here they are:

Advantest Corp. Sponsored ADR (ATE) manufactures and sells semiconductor and component test system products, and mechatronics-related products. Since January 1, ATE has slumped 13.1%. This is worse than the S&P 500, which has remained flat over the same period. For more information, get Portfolio Grader’s complete analysis of ATE stock.

Allegheny Technologies Incorporated (ATI) produces specialty metals such as titanium alloys and superalloys. Since the first of the year, ATI has dropped 3.3%. For more information, get Portfolio Grader’s complete analysis of ATI stock.

Hatteras Financial (HTS) is a mortgage real estate investment trust. For more information, get Portfolio Grader’s complete analysis of HTS stock.

Intrepid Potash, Inc. (IPI) mines and markets potash for use as a fertilizer. The price of IPI is down 8.3% since the first of the year. As of Feb. 21, 2014, 14.4% of outstanding Intrepid Potash, Inc. shares were held short. The stock’s trailing PE Ratio is 48.40. For more information, get Portfolio Grader’s complete analysis of IPI stock.

McDermott International, Inc. (MDR) is a worldwide energy services company. As of Feb. 21, 2014, 15.2% of outstanding McDermott International, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of MDR stock.

American Capital Mortgage Investment Corp. (MTGE) invests in, finances, and manages a portfolio of mortgage-related investments, such as agency mortgage investments, non-agency mortgage investments and other mortgage-related investments. For more information, get Portfolio Grader’s complete analysis of MTGE stock.

Universal American (UAM) is a life and accident and health insurance holding company. Since January 1, UAM has tumbled 4.2%. For more information, get Portfolio Grader’s complete analysis of UAM 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.