The following is a list of the 10 most and least shorted materials stocks, according to the short ratio. The ratio expresses the total number of shares shorted as a multiple of the average daily volume, i.e. the short ratio shows how many days of average volume are needed to cover all short positions.

We're not going to go into detailed analysis for each company. The goal here is to give you a starting point for your own analysis.

Short float data sourced from Finviz.

**Most Shorted Materials Stocks (By Short Ratio)**

*1. Metabolix, Inc. (NASDAQ:MBLX):* Specialty Chemicals Industry. Market cap of $383.04M. Short float at 22.24%, which implies a short ratio of 31.99 days. The stock has gained 36.76% over the last year.

*2. Delek US Holdings Inc. (NYSE:DK): *Oil & Gas Refining & Marketing Industry. Market cap of $403.5M. Short float at 12.49%, which implies a short ratio of 27.08 days. The stock has gained 13.11% over the last year.

*3. Core Laboratories NV (NYSE:CLB):* Oil & Gas Equipment & Services Industry. Market cap of $3.58B. Short float at 20.75%, which implies a short ratio of 23.89 days. The stock has gained 51.31% over the last year.

*4. Alon USA Energy, Inc. (NYSE:ALJ):* Oil & Gas Refining & Marketing Industry. Market cap of $310.45M. Short float at 13.41%, which implies a short ratio of 23.48 days. The stock has lost -33.22% over the last year.

*5. Houston American Energy Corp. (NYSEMKT:HUSA)*: Independent Oil & Gas Industry. Market cap of $439.16M. Short float at 22.86%, which implies a short ratio of 23.1 days. The stock has gained 254.14% over the last year.

*6. Hawkins Inc. (NASDAQ:HWKN):* Synthetics Industry. Market cap of $384.46M. Short float at 8.97%, which implies a short ratio of 22.11 days. The stock has gained 76.4% over the last year.

*7. Encore Wire Corp. (NASDAQ:WIRE): *Copper Industry. Market cap of $477.04M. Short float at 6.42%, which implies a short ratio of 22 days. The stock has lost -0.48% over the last year.

*8. Hallador Energy Company (NASDAQ:HNRG): *Independent Oil & Gas Industry. Market cap of $340.31M. Short float at 0.75%, which implies a short ratio of 21.07 days. The stock has gained 88.17% over the last year.

*9. Sensient Technologies Corporation (NYSE:SXT):* Specialty Chemicals Industry. Market cap of $1.66B. Short float at 5.7%, which implies a short ratio of 14.37 days. The stock has gained 34.6% over the last year.

*10. W&T Offshore Inc. (NYSE:WTI):* Oil & Gas Drilling & Exploration Industry. Market cap of $1.06B. Short float at 21.78%, which implies a short ratio of 13.87 days. The stock has gained 21.48% over the last year.

*click for expanded images *

**Least Shorted Materials Stocks (By Short Ratio)**

*1. Silvercorp Metals Inc. (NYSE:SVM):* Silver Industry. Market cap of $2.93B. Short float at 0.14%, which implies a short ratio of 0.31 days. The stock has gained 84.19% over the last year.

*2. Taseko Mines Ltd. (NYSEMKT:TGB): *Copper Industry. Market cap of $916.55M. Short float at 0.57%, which implies a short ratio of 0.4 days. The stock has gained 51.08% over the last year.

*3. Energy Services of America Corporation (ESA):* Oil & Gas Equipment & Services Industry. Market cap of $333.47M. Short float at 0.01%, which implies a short ratio of 0.45 days. The stock has gained 16.84% over the last year.

*4. BHP Billiton plc (NYSE:BBL): *Industrial Metals & Minerals Industry. Market cap of $205.88B. Short float at 0.04%, which implies a short ratio of 0.69 days. The stock has gained 38.09% over the last year.

*5. Petroleo Brasileiro (NYSE:PBR):* Oil & Gas Drilling & Exploration Industry. Market cap of $152.93B. Short float at 0.52%, which implies a short ratio of 0.69 days. The stock has lost -25.47% over the last year.

*6. Potash Corp. of Saskatchewan, Inc. (NYSE:POT):* Agricultural Chemicals Industry. Market cap of $43.16B. Short float at 1.64%, which implies a short ratio of 0.69 days. The stock has gained 55.76% over the last year.

*7. IAMGOLD Corp. (NYSE:IAG):* Gold Industry. Market cap of $6.85B. Short float at 0.62%, which implies a short ratio of 0.7 days. The stock has gained 39.09% over the last year.

*8. Rubicon Minerals Corporation (RBY):* Gold Industry. Market cap of $815.8M. Short float at 0.33%, which implies a short ratio of 0.7 days. The stock has lost -11.57% over the last year.

*9. El Paso Pipeline Partners, L.P. (NYSE:EPB):* Oil & Gas Pipelines Industry. Market cap of $5.12B. Short float at 0.6%, which implies a short ratio of 0.71 days. The stock has gained 62.56% over the last year.

*10. Aurizon Mines Ltd. (AZK):* Gold Industry. Market cap of $1.09B. Short float at 0.33%, which implies a short ratio of 0.73 days. The stock has gained 48.8% over the last year.

**Disclosure: **No positions