| ESSEX INVESTMENT MANAGEMENT CO LLC | 322,278 | 2.9% | +132,638 |
| MARSHALL WACE, LLP | 263,186 | 2.3% | +8,997 |
| Meros Investment Management, LP | 254,310 | 2.3% | +230,000 |
| VANGUARD CAPITAL MANAGEMENT LLC | 220,272 | 2.0% | −43,467 |
| Archon Capital Management LLC | 140,000 | 1.2% | +0 |
| Round Rock Advisors LLC | 117,366 | 1.0% | +0 |
| Legato Capital Management LLC | 108,091 | 1.0% | +49,879 |
| DIMENSIONAL FUND ADVISORS LP | 108,083 | 1.0% | +9,229 |
| RENAISSANCE TECHNOLOGIES LLC | 102,928 | 0.9% | +81,600 |
| Grandeur Peak Global Advisors, LLC | 68,683 | 0.6% | +6,164 |
| NAVELLIER & ASSOCIATES INC | 65,811 | 0.6% | +19,361 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 64,363 | 0.6% | −35,197 |
| BlackRock, Inc. | 62,824 | 0.6% | +5,392 |
| GEODE CAPITAL MANAGEMENT, LLC | 60,331 | 0.5% | −2,711 |