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The following is a list of biotech stocks that are being targeted by short sellers. All of these stocks have seen significant increases in their short ratios between the end of May and the end of August.

The short ratio expresses the total number of shares shorted as a multiple of the stock's average daily volume.

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

Data sourced from AOL Money and Finance.



1. AVEO Pharmaceuticals, Inc. (AVEO): Market cap of $262M. The company's short ratio has increased from 0.5 at the end of May to 15.4 at the end of August.

2. InterMune Inc. (ITMN): Market cap of $675M. The company's short ratio has increased from 0.8 at the end of May to 5.1 at the end of August. The stock has lost -29.33% over the last year.

3. Corcept Therapeutics Inc. (CORT): Market cap of $236M. The company's short ratio has increased from 4.2 at the end of May to 24 at the end of August. The stock has gained 109.62% over the last year.

4. China Biologic Products, Inc. (CBPO): Market cap of $226M. The company's short ratio has increased from 3.2 at the end of May to 15.5 at the end of August. The stock has gained 71.61% over the last year.

5. Neurocrine Biosciences Inc. (NBIX): Market cap of $322M. The company's short ratio has increased from 1.5 at the end of May to 6.6 at the end of August. The stock has gained 82.61% over the last year.

6. Eurand N.V. (EURX): Market cap of $444M. The company's short ratio has increased from 4 at the end of May to 17.2 at the end of August. The stock has lost -30.25% over the last year.

7. Cell Therapeutics, Inc. (CTIC):
Market cap of $284M. The company's short ratio has increased from 9.1 at the end of May to 38 at the end of August. The stock has lost -73.96% over the last year.

8. PROLOR Biotech, Inc. (PBTH): Market cap of $325M. The company's short ratio has increased from 3.4 at the end of May to 11.9 at the end of August. The stock has gained 306.67% over the last year.

9. Biogen Idec Inc. (BIIB): Market cap of $13,952B. The company's short ratio has increased from 1.6 at the end of May to 5.5 at the end of August. The stock has gained 11.87% over the last year.

10. Charles River Laboratories International, Inc. (CRL): Market cap of $2,057B. The company's short ratio has increased from 3 at the end of May to 10.1 at the end of August. The stock has lost -16.83% over the last year.

11. Dendreon Corp. (DNDN): Market cap of $5,990B. The company's short ratio has increased from 0.9 at the end of May to 2.9 at the end of August. The stock has gained 55.17% over the last year.

12. Micromet, Inc. (MITI): Market cap of $538M. The company's short ratio has increased from 7.4 at the end of May to 22.9 at the end of August. The stock has lost -19.52% over the last year.

13. Amylin Pharmaceuticals, Inc. (AMLN):
Market cap of $3,007B. The company's short ratio has increased from 4.4 at the end of May to 13.4 at the end of August. The stock has gained 48.44% over the last year.

14. ViroPharma Inc. (VPHM): Market cap of $1,025B. The company's short ratio has increased from 3.8 at the end of May to 11.2 at the end of August. The stock has gained 56.79% over the last year.

15. Codexis, Inc. (CDXS): Market cap of $288M. The company's short ratio has increased from 1.8 at the end of May to 5.2 at the end of August.

16. Cytori Therapeutics, Inc. (CYTX): Market cap of $221M. The company's short ratio has increased from 7.3 at the end of May to 20.7 at the end of August. The stock has gained 32.14% over the last year.

17. Celgene Corporation (CELG): Market cap of $25,192B. The company's short ratio has increased from 1.3 at the end of May to 3.6 at the end of August. The stock has gained 2.14% over the last year.

18. Lexicon Pharmaceuticals, Inc. (LXRX): Market cap of $482M. The company's short ratio has increased from 5.5 at the end of May to 14.4 at the end of August. The stock has lost -41.87% over the last year.

19. VIVUS Inc. (VVUS): Market cap of $508M. The company's short ratio has increased from 2.7 at the end of May to 6.5 at the end of August. The stock has lost -41.98% over the last year.

20. Enzon Pharmaceuticals Inc. (ENZN): Market cap of $640M. The company's short ratio has increased from 7.8 at the end of May to 18.3 at the end of August. The stock has gained 31.51% over the last year.

Disclosure: No positions

Source: 20 Biotech Stocks Targeted by Short Sellers Over the Last 3 Months