The following is a list of small cap stocks, with market caps smaller than $2.0 billion. In addition, all of these stocks have seen a significant increase in shares shorted between 9/30 - 12/31.

Short sellers seem to think these stocks are vulnerable - what do you think? Full details below.

Short trends data sourced from AOL Money.

*Interactive Chart: Press Play to compare changes in analyst ratings over the last two years for the top six stocks mentioned below. Analyst ratings sourced from Zacks Investment Research. Note: The numbers on top of items represent the forward P/E ratio, if available.*

The list has been sorted by the change in shares shorted over the last three months. A reminder: All short trends described occur between 9/30 -12/31.

**1. Trina Solar Ltd. (NYSE:TSL):** Semiconductor Industry. Market cap of $1.81B. Shorted shares increased from 3.41M to 7.12M (+109% increase). Short float at 10.22%, which implies a short ratio of 2.01 days. The stock has gained 4.93% over the last year.

**2. Yingli Green Energy Holding Co. Ltd. (NYSE:YGE):** Semiconductor Industry. Market cap of $1.56B. Shorted shares increased from 5.93M to 12.09M (+104% increase). Short float at 49.09%, which implies a short ratio of 3.58 days. The stock has lost -30.9% over the last year.

**3. Hyperdynamics Corporation (NYSE:HDY):** Oil and Gas Drilling and Exploration Industry. Market cap of $874.79M. Shorted shares increased from 2.12M to 3.64M (+72% increase). Short float at 3.31%, which implies a short ratio of 2.41 days. The stock has gained 673.63% over the last year.

**4. Travelzoo Inc. (NASDAQ:TZOO):** Internet Information Providers Industry. Market cap of $802.27M. Shorted shares increased from 1.01M to 1.63M (+61% increase). Short float at 29.48%, which implies a short ratio of 5.49 days. The stock has gained 311.12% over the last year.

**5. Ivanhoe Energy Inc. (NASDAQ:IVAN)**: Independent Oil and Gas Industry. Market cap of $1.05B. Shorted shares increased from 2.01M to 3.16M (+57% increase). Short float at 1.13%, which implies a short ratio of 2.37 days. The stock has gained 8.62% over the last year.

**6. rue21, Inc. (NASDAQ:RUE):** Apparel Stores Industry. Market cap of $805.96M. Shorted shares increased from 1.67M to 2.46M (+47% increase). Short float at 11.04%, which implies a short ratio of 16.07 days. The stock has gained 10.87% over the last year.

**7. Standard Pacific Corp. (SPF):** Residential Construction Industry. Market cap of $530.54M. Shorted shares increased from 11.3M to 16.62M (+47% increase). Short float at 15.78%, which implies a short ratio of 8.05 days. The stock has gained 26.92% over the last year.

**8. Magnum Hunter Resources Corp. (MHR)**: Oil and Gas Drilling and Exploration Industry. Market cap of $547.22M. Shorted shares increased from 4.09M to 6M (+47% increase). Short float at 8.27%, which implies a short ratio of 4.22 days. The stock has gained 283.17% over the last year.

**9. MannKind Corp. (NASDAQ:MNKD):** Biotechnology Industry. Market cap of $1.2B. Shorted shares increased from 14.74M to 21.48M (+46% increase). Short float at 28.23%, which implies a short ratio of 7.39 days. The stock has lost -3.7% over the last year.

**10. Clinical Data, I*** nc. (NASDAQ:CLDA):* Biotechnology Industry. Market cap of $464.68M. Shorted shares increased from 2.35M to 3.14M (+34% increase). Short float at 16.77%, which implies a short ratio of 16.23 days. The stock has lost -14.07% over the last year.

**11. Capitol Federal Financial (CFFND):** Savings and Loan Industry. Market cap of $1.97B. Shorted shares increased from 3.24M to 4.2M (+30% increase). Short float at 9.33%, which implies a short ratio of 1.98 days. The stock has lost -9.96% over the last year.

**12. Resolute Energy Corporation (NYSE:REN):** Independent Oil and Gas Industry. Market cap of $927.68M. Shorted shares increased from 2.64M to 3.42M (+30% increase). Short float at 6.5%, which implies a short ratio of 12.66 days. The stock has gained 64.49% over the last year.

**13. LDK Solar Co., Ltd. (NYSE:LDK):** Semiconductor Industry. Market cap of $1.59B. Shorted shares increased from 11.43M to 14.74M (+29% increase). Short float at 11.21%, which implies a short ratio of 2.44 days. The stock has gained 68.06% over the last year.

**14. RTI International Metals, Inc. (NYSE:RTI):** Industrial Metals and Minerals Industry. Market cap of $789.75M. Shorted shares increased from 1.87M to 2.39M (+28% increase). Short float at 8.06%, which implies a short ratio of 5.61 days. The stock has lost -3.32% over the last year.

**15. Sangamo Biosciences Inc. (NASDAQ:SGMO):** Biotechnology Industry. Market cap of $360.86M. Shorted shares increased from 3.81M to 4.75M (+25% increase). Short float at 11.15%, which implies a short ratio of 13.14 days. The stock has gained 26.27% over the last year.

**16. hhgregg, Inc. (NYSE:HGG):** Electronics Stores Industry. Market cap of $761.56M. Shorted shares increased from 8.79M to 10.9M (+24% increase). Short float at 33.03%, which implies a short ratio of 15.32 days. The stock has lost -5.77% over the last year.

**17. Acorda Therapeutics, Inc. (NASDAQ:ACOR):** Biotechnology Industry. Market cap of $1.03B. Shorted shares increased from 5.66M to 6.77M (+20% increase). Short float at 17.34%, which implies a short ratio of 8.49 days. The stock has gained 4.59% over the last year.

**18. Cabot Microelectronics Corp. (NASDAQ:CCMP):** Semiconductor Industry. Market cap of $1.03B. Shorted shares increased from 2.59M to 2.96M (+14% increase). Short float at 12.99%, which implies a short ratio of 19.44 days. The stock has gained 36.22% over the last year.

**Disclosure: **I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.