This week, these ten stocks have the worst year-to-date performance. Each of these also rates an “F” (“strong sell”) on Portfolio Grader.

The price of EXCO Resources, Inc. (XCO) is down 41.2% since the first of the year. EXCO Resources is an oil and natural gas company involved in the exploration, exploitation, development and production of onshore North American oil and natural gas properties. As of Oct. 9, 2014, 13.3% of outstanding EXCO Resources, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of XCO stock.

The price of Clean Energy Fuels (CLNE) has fallen 45.4% since the first of the year. Clean Energy Fuels sells natural gas fueling solutions to its customers mainly in the United States and Canada. As of Oct. 9, 2014, 17.5% of outstanding Clean Energy Fuels shares were held short. Trade volume is up 221.4% from the previous week. For more information, get Portfolio Grader’s complete analysis of CLNE stock.

Since January 1, CGG Sponsored ADR (CGG) has fallen 48.5%. CGG provides geophysical services and software products and manufactures geophysical equipment. For more information, get Portfolio Grader’s complete analysis of CGG stock.

Since the first of the year, Elizabeth Arden, Inc. (RDEN) has dipped 51.3%. Elizabeth Arden manufactures, distributes, and markets prestige fragrances and related skin treatment and cosmetic products for men and women. Shares of the stock have been changing hands at an unusually rapid pace, up 1106.5% from the week prior. For more information, get Portfolio Grader’s complete analysis of RDEN stock.

Since the first of the year, the price of Coeur Mining, Inc. (CDE) is down 54%. Coeur Mining explores, develops, operates, and/or owns silver and gold mining properties and companies. As of Oct. 9, 2014, 10.2% of outstanding Coeur Mining, Inc. shares were held short. Shares of the stock are being traded at a very rapid pace, up 296.1% from the week prior. For more information, get Portfolio Grader’s complete analysis of CDE stock.

Shares of Arch Coal, Inc. (ACI) have slipped 55.8% since January 1. Arch Coal produces coal and sells it to power plants, steel mills, and industrial facilities. As of Oct. 9, 2014, 20.3% of outstanding Arch Coal, Inc. shares were held short. Shares of the stock have been changing hands at an unusually rapid pace, up 224.6% from the week prior. For more information, get Portfolio Grader’s complete analysis of ACI stock.

Since the first of the year, Aeropostale, Inc. (ARO) has tumbled 60%. Aeropostale is a mall-based specialty retailer of casual apparel and accessories. As of Oct. 9, 2014, 29.6% of outstanding Aeropostale, Inc. shares were held short. Shares of the stock are being traded at a very rapid pace, up 218.3% from the week prior. For more information, get Portfolio Grader’s complete analysis of ARO stock.

Shares of Energy XXI (Bermuda) Limited (EXXI) have dipped 61.5% since the first of the year. Energy XXI explores for and produces oil and natural gas. As of Oct. 9, 2014, 18.5% of outstanding Energy XXI (Bermuda) Limited shares were held short. Trade volume is up 349.4% from the previous week. For more information, get Portfolio Grader’s complete analysis of EXXI stock.

Shares of Alpha Natural Resources, Inc. (ANR) have fallen 67.2% since January 1. Alpha Natural Resources produces, processes and sells steam and metallurgical coal. As of Oct. 9, 2014, 27.4% of outstanding Alpha Natural Resources, Inc. shares were held short. Shares of the stock have been changing hands at an unusually rapid pace, up 116.6% from the week prior. For more information, get Portfolio Grader’s complete analysis of ANR stock.

Share prices of Walter Energy (WLT) are down 85.8% since the first of the year. Walter Energy is a producer and exporter of metallurgical coal for the global steel industry. As of Oct. 9, 2014, 12.6% of outstanding Walter Energy shares were held short. For more information, get Portfolio Grader’s complete analysis of WLT 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.