| Montanaro Asset Management Ltd | 89,950 | $38,952 | 4.80% |
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| STONE RUN CAPITAL, LLC | 22,325 | $9,668 | 3.57% |
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| DF DENT & CO INC | 686,484 | $297,275 | 3.42% |
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| MAIRS & POWER INC | 657,962 | $284,924 | 2.87% |
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| Summit Creek Advisors LLC | 58,133 | $25,174 | 2.85% |
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| Pembroke Management, LTD | 76,250 | $33,019 | 2.76% |
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| OBERMEYER WOOD INVESTMENT COUNSEL, LLLP | 100,204 | $43,392 | 2.60% |
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| AMERICAN CAPITAL MANAGEMENT INC | 192,773 | $83,478 | 2.46% |
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| GENEVA CAPITAL MANAGEMENT LLC | 257,652 | $111,574 | 2.16% |
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| Winslow Capital Management, LLC | 734,215 | $317,944 | 1.38% |
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| ROWLAND & CO INVESTMENT COUNSEL/ADV | 13,070 | $5,659,832 | 1.31% |
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| Dorsey & Whitney Trust CO LLC | 33,249 | $14,398 | 1.26% |
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| Values First Advisors, Inc. | 4,420 | $1,914 | 1.21% |
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| FRED ALGER MANAGEMENT, LLC | 827,427 | $358,309 | 1.14% |
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| RIVERBRIDGE PARTNERS LLC | 231,533 | $100,263 | 1.13% |
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| ARGUS INVESTORS' COUNSEL, INC. | 4,056 | $1,756 | 1.12% |
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| Champlain Investment Partners, LLC | 497,455 | $215,418 | 1.12% |
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| Stephens Investment Management Group LLC | 163,619 | $70,854 | 1.04% |
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| SEGALL BRYANT & HAMILL, LLC | 225,521 | $97,657 | 0.93% |
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| ROBERTS GLORE & CO INC /IL/ | 7,163 | $3,102 | 0.89% |
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