| Conestoga Capital Advisors, LLC | 1,556,536 | $265,560,607 | 4.56% |
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| Summit Creek Advisors LLC | 136,591 | $23,303,791 | 3.17% |
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| Granahan Investment Management | 424,554 | $72,433,158 | 2.58% |
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| Herald Investment Management Ltd | 70,100 | $11,933,123 | 2.54% |
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| RIVERBRIDGE PARTNERS LLC | 828,177 | $141,295,273 | 2.05% |
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| Redwood Investments, LLC | 85,579 | $14,600,633 | 1.98% |
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| MOODY ALDRICH PARTNERS LLC | 60,077 | $10,249,737 | 1.94% |
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| Pembroke Management, LTD | 75,792 | $12,930,873 | 1.76% |
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| GENEVA CAPITAL MANAGEMENT LLC | 456,423 | $77,870,320 | 1.64% |
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| Bouvel Investment Partners, LLC | 17,641 | $3,009,646 | 1.63% |
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| Tributary Capital Management, LLC | 83,570 | $14,257,878 | 1.35% |
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| Laurus Investment Counsel Inc. | 13,430 | $3,088,410 | 1.30% |
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| CONGRESS ASSET MANAGEMENT CO /MA | 848,269 | $144,723,098 | 1.28% |
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| IRONWOOD INVESTMENT MANAGEMENT LLC | 12,049 | $2,055,680 | 1.26% |
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| AMERICAN CAPITAL MANAGEMENT INC | 168,053 | $28,671,522 | 1.10% |
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| NEXT CENTURY GROWTH INVESTORS LLC | 53,286 | $9,091,124 | 0.99% |
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| Yorktown Management & Research Co Inc | 4,330 | $738,741 | 0.83% |
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| OAK RIDGE INVESTMENTS LLC | 37,760 | $6,442,234 | 0.82% |
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| DISCIPLINED GROWTH INVESTORS INC /MN | 190,696 | $32,534,645 | 0.77% |
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| OSTERWEIS CAPITAL MANAGEMENT INC | 53,950 | $9,204,410 | 0.67% |
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