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Short sellers can give a quick and easy look into what the market is currently thinking about a stock - stocks seeing more shares shorted over time are being viewed more negatively, and vice-versa.

To illustrate this, we ran a screen on the healthcare industry for stocks seeing the most significant increases in shares shorted month-over-month, indicating short sellers believe these stocks will underperform.

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.‬

We also created a price-weighted index of the stocks mentioned below, and monitored the performance of the list relative to the S&P 500 index over the last month. To access a complete analysis of this list's recent performance, click here.

Do you think these stocks have bad prospects? Use this list as a starting point for your own analysis.

List sorted by increase in shares shorted as a percent of share float.

1. Spectrum Pharmaceuticals, Inc. (NASDAQ:SPPI): A commercial-stage biotechnology company, primarily focuses on oncology and hematology. Market cap of $880.10M. Shares shorted have increased from 7.06M to 8.67M month-over-month, a change representing 3.26% of the company's 49.40M share float. The stock is a short squeeze candidate, with a short float at 16.91% (equivalent to 5.58 days of average volume). The stock has gained 142.18% over the last year.

2. Human Genome Sciences Inc. (HGSI): Operates as a biopharmaceutical company. Market cap of $1.81B. Shares shorted have increased from 24.31M to 28.77M month-over-month, a change representing 2.25% of the company's 198.01M share float. The stock has had a couple of great days, gaining 7.03% over the last week.

3. USANA Health Sciences Inc. (NYSE:USNA): Develops, manufactures, distributes, and sells nutritional and personal care products worldwide. Market cap of $506.10M. Shares shorted have increased from 2.21M to 2.36M month-over-month, a change representing 2.22% of the company's 6.77M share float. Might be undervalued at current levels, with a PEG ratio at 0.67, and P/FCF ratio at 7.88. The stock is a short squeeze candidate, with a short float at 34.5% (equivalent to 35.08 days of average volume). The stock has had a good month, gaining 11.87%.

4. Natus Medical Inc. (NASDAQ:BABY): Develops, manufactures, and markets neurodiagnostic and newborn care products worldwide. Market cap of $328.58M. Shares shorted have increased from 1.17M to 1.49M month-over-month, a change representing 1.48% of the company's 21.55M share float. The stock is a short squeeze candidate, with a short float at 5.23% (equivalent to 6.83 days of average volume). The stock has had a couple of great days, gaining 7.6% over the last week.

5. Conceptus, Inc. (NASDAQ:CPTS): Designs, develops, and markets minimally invasive devices for reproductive medical applications primarily in the United States, France, and Europe. Market cap of $362.38M. Shares shorted have increased from 2.40M to 2.81M month-over-month, a change representing 1.42% of the company's 28.78M share float. The stock is a short squeeze candidate, with a short float at 9.12% (equivalent to 11.89 days of average volume). The stock has lost 14.45% over the last year.

6. Bio-Reference Laboratories Inc. (NASDAQ:BRLI): Provides clinical laboratory testing services for the detection, diagnosis, evaluation, monitoring, and treatment of diseases primarily in the greater New York metropolitan area. Market cap of $519.59M. Shares shorted have increased from 4.01M to 4.36M month-over-month, a change representing 1.41% of the company's 24.74M share float. The stock is a short squeeze candidate, with a short float at 17.62% (equivalent to 7.51 days of average volume). The stock has had a couple of great days, gaining 7.33% over the last week.

7. Nektar Therapeutics (NASDAQ:NKTR): Engages in developing a pipeline of drug candidates that utilize its PEGylation and polymer conjugate technology platforms. Market cap of $693.45M. Shares shorted have increased from 17.58M to 18.92M month-over-month, a change representing 1.40% of the company's 95.49M share float. The stock is a short squeeze candidate, with a short float at 16.6% (equivalent to 14.15 days of average volume). The stock has had a good month, gaining 12.85%.

8. MAKO Surgical Corp. (NASDAQ:MAKO): A medical device company, markets its advanced robotic arm solution and orthopedic implants for orthopedic procedures in the United States and internationally. Market cap of $1.43B. Shares shorted have increased from 10.66M to 11.17M month-over-month, a change representing 1.39% of the company's 36.64M share float. The stock is a short squeeze candidate, with a short float at 28.58% (equivalent to 10.56 days of average volume). The stock has had a good month, gaining 28.18%.

9. Onyx Pharmaceuticals, Inc. (NASDAQ:ONXX): Engages in developing therapies targeting the molecular mechanisms causing cancer in the United States and internationally. Market cap of $2.62B. Shares shorted have increased from 5.80M to 6.49M month-over-month, a change representing 1.16% of the company's 59.35M share float. It's been a rough couple of days for the stock, losing 6.27% over the last week.

10. Molina Healthcare Inc. (NYSE:MOH): Provides Medicaid-related solutions to meet the health care needs of low-income families and individuals, as well as assists state agencies in their administration of the Medicaid program. Market cap of $1.30B. Shares shorted have increased from 2.40M to 2.68M month-over-month, a change representing 1.12% of the company's 24.92M share float. The stock is a short squeeze candidate, with a short float at 9.49% (equivalent to 6.75 days of average volume). The stock has had a good month, gaining 28.63%.

11. Dendreon Corp. (NASDAQ:DNDN): Engages in the discovery, development, and commercialization of therapeutics to enhance cancer treatment options for patients. Market cap of $2.08B. Shares shorted have increased from 31.34M to 32.90M month-over-month, a change representing 1.07% of the company's 145.74M share float. The stock has had a good month, gaining 86.27%.

12. Seattle Genetics Inc. (NASDAQ:SGEN): Focuses on the development and commercialization of monoclonal antibody-based therapies for the treatment of cancer and autoimmune diseases in the United States. Market cap of $2.06B. Shares shorted have increased from 25.40M to 26.58M month-over-month, a change representing 1.04% of the company's 113.40M share float. The stock is a short squeeze candidate, with a short float at 23.43% (equivalent to 15.8 days of average volume). The stock has gained 10.33% over the last year.

*Short data sourced from Yahoo! Finance, all other data sourced from Finviz.

Source: 12 Healthcare Stocks With Bearish Short Trends