The following is a list of biotech companies with top management teams. All the companies mentioned below have all outperformed their competitors over the last five years, when comparing the Return on Assets (ROA), Return on Invested Capital (ROI) and Return on Equity (ROE) ratios.

Will these management teams continue to outperform? What do you think? Full details below.

Management data and industry comps sourced from Reuters, short float and performance data sourced from Finviz.

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.

* 1. PDL BioPharma, Inc. (NASDAQ:PDLI):* Market cap of $765.45M. 5-year average return on assets at 20.67% vs. industry average at 3.08%. 5-year average return on investments at 23.45% vs. industry average at 3.60%. 5-year return on equity at 75.95% vs. industry average at 4.15%. Short float at 8.24%, which implies a short ratio of 5.52 days. The stock has lost -5.03% over the last year.

*Market cap of $31.03B. 5-year average return on assets at 21.83% vs. industry average at 3.08%. 5-year average return on investments at 26.53% vs. industry average at 3.60%. 5-year return on equity at 34.88% vs. industry average at 4.15%. Short float at 2%, which implies a short ratio of 1.79 days. The stock has lost -16.04% over the last year.*

**2. Gilead Sciences Inc. (NASDAQ:GILD):***Market cap of $2.48B. 5-year average return on assets at 21.57% vs. industry average at 3.08%. 5-year average return on investments at 22.45% vs. industry average at 3.60%. 5-year return on equity at 22.65% vs. industry average at 4.15%. Short float at 1.99%, which implies a short ratio of 7.52 days. The stock has gained 1.27% over the last year.*

**3. Techne Corp. (NASDAQ:TECH):***Market cap of $53.38B. 5-year average return on assets at 10.89% vs. industry average at 3.08%. 5-year average return on investments at 12.84% vs. industry average at 3.60%. 5-year return on equity at 18.48% vs. industry average at 4.15%. Short float at 1.62%, which implies a short ratio of 2.4 days. The stock has gained 0.44% over the last year.*

**4. Amgen Inc. (NASDAQ:AMGN):***Market cap of $833.97M. 5-year average return on assets at 9.73% vs. industry average at 3.08%. 5-year average return on investments at 12.56% vs. industry average at 3.60%. 5-year return on equity at 16.17% vs. industry average at 4.15%. Short float at 4.23%, which implies a short ratio of 5.54 days. The stock has gained 75.46% over the last year.*

**5. Emergent BioSolutions, Inc. (NYSE:EBS):***: Market cap of $949.96M. 5-year average return on assets at 34.19% vs. industry average at 9.93%. 5-year average return on investments at 45.63% vs. industry average at 12.87%. 5-year return on equity at 48.30% vs. industry average at 16.44%. Short float at 13.3%, which implies a short ratio of 8.6 days. The stock has gained 204.38% over the last year.*

**6. Questcor Pharmaceuticals, Inc. (QCOR)***Market cap of $1.44B. 5-year average return on assets at 9.69% vs. industry average at 3.08%. 5-year average return on investments at 10.38% vs. industry average at 3.60%. 5-year return on equity at 13.86% vs. industry average at 4.15%. Short float at 8.32%, which implies a short ratio of 8.04 days. The stock has gained 94.4% over the last year.*

**7. ViroPharma Inc. (VPHM):***Market cap of $347.65M. 5-year average return on assets at 8.88% vs. industry average at 3.08%. 5-year average return on investments at 9.79% vs. industry average at 3.60%. 5-year return on equity at 10.06% vs. industry average at 4.15%. Short float at 0.68%, which implies a short ratio of 1.34 days. The stock has gained 20.18% over the last year.*

**8. 3SBio Inc. (NASDAQ:SSRX):***Market cap of $15.86B. 5-year average return on assets at 6.34% vs. industry average at 3.08%. 5-year average return on investments at 7.24% vs. industry average at 3.60%. 5-year return on equity at 8.65% vs. industry average at 4.15%. Short float at 3.68%, which implies a short ratio of 4.29 days. The stock has gained 22.87% over the last year.*

**9. Biogen Idec Inc. (NASDAQ:BIIB):***: Market cap of $4.49B. 5-year average return on assets at 4.15% vs. industry average at 3.08%. 5-year average return on investments at 4.55% vs. industry average at 3.60%. 5-year return on equity at 7.87% vs. industry average at 4.15%. Short float at 2.41%, which implies a short ratio of 4.21 days. The stock has lost -17.93% over the last year.*

**10. Qiagen NV (NASDAQ:QGEN)***Market cap of $1.06B. 5-year average return on assets at 4.76% vs. industry average at 3.08%. 5-year average return on investments at 5.11% vs. industry average at 3.60%. 5-year return on equity at 5.43% vs. industry average at 4.15%. Short float at 9.03%, which implies a short ratio of 3.23 days. The stock has gained 65.7% over the last year.*

**11. Martek Biosciences Corp. (MATK):***Market cap of $18.69B. 5-year average return on assets at 4.47% vs. industry average at 3.08%. 5-year average return on investments at 5.04% vs. industry average at 3.60%. 5-year return on equity at 5.68% vs. industry average at 4.15%. Short float at 7.77%, which implies a short ratio of 7.6 days. The stock has gained 35.04% over the last year.*

**12. Genzyme Corp. (GENZ):****Disclosure:**No positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.