| Essex Woodlands Management, Inc. | 13,021,324 | $122.9m | 48.3% |
| Nantahala Capital Management, LLC | 12,000,558 | $113.3m | 1.9% |
| Juniper Investment Company, LLC | 6,939,357 | $65.5m | 17.3% |
| BlackRock, Inc. | 3,435,914 | $32.4m | 0.0% |
| ROYCE & ASSOCIATES LP | 1,833,212 | $17.3m | 0.1% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1,751,678 | $16.5m | 0.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 1,365,716 | $12.9m | 0.0% |
| AMERICAN CENTURY COMPANIES INC | 1,353,415 | $12.8m | 0.0% |
| DIMENSIONAL FUND ADVISORS LP | 1,128,465 | $10.7m | 0.0% |
| STATE STREET CORP | 1,104,878 | $10.4m | 0.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1,042,796 | $9.8m | 0.0% |
| Hillsdale Investment Management Inc. | 907,739 | $8.6m | 0.2% |
| Engine Capital Management, LP | 900,558 | $8.5m | 0.8% |
| WELLINGTON MANAGEMENT GROUP LLP | 748,358 | $7.1m | 0.0% |
| RENAISSANCE TECHNOLOGIES LLC | 736,000 | $6.9m | 0.0% |
| OBERWEIS ASSET MANAGEMENT INC/ | 709,714 | $6.7m | 0.1% |
| GOLDMAN SACHS GROUP INC | 652,367 | $6.2m | 0.0% |
| KENNEDY CAPITAL MANAGEMENT LLC | 466,563 | $4.4m | 0.1% |
| FMR LLC | 452,850 | $4.3m | 0.0% |
| NORTHERN TRUST CORP | 443,824 | $4.2m | 0.0% |
| PRUDENTIAL FINANCIAL INC | 394,520 | $3.7m | 0.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 391,859 | $3.7m | 0.0% |
| TOCQUEVILLE ASSET MANAGEMENT L.P. | 369,673 | $3.5m | 0.0% |
| ACADIAN ASSET MANAGEMENT LLC | 336,998 | $3.2m | 0.0% |
| VANGUARD FIDUCIARY TRUST CO | 327,838 | $3.1m | 0.0% |