| BlackRock, Inc. | 2,659,542 | $255.5m | 0.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1,320,350 | $126.8m | 0.0% |
| D. E. Shaw & Co., Inc. | 1,177,421 | $113.1m | 0.1% |
| TWO SIGMA INVESTMENTS, LP | 1,164,614 | $111.9m | 0.1% |
| FMR LLC | 1,006,830 | $96.7m | 0.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 966,659 | $92.9m | 0.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 875,505 | $84.1m | 0.0% |
| GOLDMAN SACHS GROUP INC | 810,036 | $77.8m | 0.0% |
| JANE STREET GROUP, LLC | 753,523 | $72.4m | 0.0% |
| JPMORGAN CHASE & CO | 732,547 | $69.6m | 0.0% |
| STATE STREET CORP | 712,926 | $68.5m | 0.0% |
| Connor, Clark & Lunn Investment Management Ltd. | 670,758 | $64.4m | 0.1% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 507,035 | $48.7m | 0.0% |
| MORGAN STANLEY | 480,400 | $46.1m | 0.0% |
| NEXT CENTURY GROWTH INVESTORS LLC | 410,731 | $39.5m | 2.1% |
| CITADEL ADVISORS LLC | 400,732 | $38.5m | 0.0% |
| MARSHALL WACE, LLP | 382,738 | $36.8m | 0.0% |
| AWM Investment Company, Inc. | 374,808 | $36.0m | 3.1% |
| T. Rowe Price Investment Management, Inc. | 318,127 | $30.6m | 0.0% |
| Invesco Ltd. | 296,226 | $28.5m | 0.0% |
| NORTHERN TRUST CORP | 277,020 | $26.6m | 0.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 249,512 | $24.0m | 0.0% |
| Science & Technology Partners, L.P. | 249,000 | $23.9m | 4.0% |
| LORD, ABBETT & CO. LLC | 247,640 | $23.8m | 0.1% |
| WELLINGTON MANAGEMENT GROUP LLP | 238,453 | $22.9m | 0.0% |