| BlackRock, Inc. | 4,879,159 | $339.7m | 0.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2,398,757 | $167.0m | 0.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2,197,052 | $153.0m | 0.0% |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 1,992,740 | $138.7m | 4.2% |
| Driehaus Capital Management LLC | 1,986,119 | $138.3m | 0.8% |
| Invesco Ltd. | 1,641,651 | $114.3m | 0.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 1,634,809 | $113.8m | 0.0% |
| NEUBERGER BERMAN GROUP LLC | 1,466,211 | $101.7m | 0.1% |
| STATE STREET CORP | 1,278,751 | $89.0m | 0.0% |
| FMR LLC | 1,062,847 | $74.0m | 0.0% |
| JPMORGAN CHASE & CO | 1,027,352 | $67.0m | 0.0% |
| AWM Investment Company, Inc. | 939,011 | $65.4m | 5.7% |
| VAN ECK ASSOCIATES CORP | 929,609 | $64.7m | 0.0% |
| GILDER GAGNON HOWE & CO LLC | 840,995 | $58.6m | 0.6% |
| Hood River Capital Management LLC | 836,229 | $58.2m | 0.4% |
| GOLDMAN SACHS GROUP INC | 783,559 | $54.6m | 0.0% |
| DIMENSIONAL FUND ADVISORS LP | 777,085 | $54.1m | 0.0% |
| Nuveen, LLC | 751,064 | $52.3m | 0.0% |
| ALLIANCEBERNSTEIN L.P. | 913,895 | $52.1m | 0.0% |
| EMERALD ADVISERS, LLC | 736,848 | $51.3m | 1.2% |
| PINNACLE ASSOCIATES LTD | 712,536 | $49.6m | 0.5% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 689,858 | $48.0m | 0.0% |
| Artisan Partners Limited Partnership | 607,690 | $42.3m | 0.1% |
| NORTHERN TRUST CORP | 597,770 | $41.6m | 0.0% |
| RAYMOND JAMES FINANCIAL INC | 554,978 | $38.6m | 0.0% |