4. Ziopharm Oncology (ZIOP)
Shorts say: R.J. Kirk is full of $%^&.
3. Dendreon (DNDN)Short interest: 35% of float ^NBI data by YCharts
Shorts say: Going out of business. 2. Spectrum Pharmaceuticals (SPPI) Short interest: 37% of float ^NBI data by YCharts
Shorts say: Is Raj still CEO? He is? Short! And the most highly shorted biotech stock in 2013 is...