| Nierenberg Investment Management Company, Inc. | 2,422,358 | $19,281,970 | 13.19% |
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| Hudson Executive Capital LP | 12,245,860 | $97,477,046 | 11.76% |
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| Sargent Investment Group, LLC | 1,817,428 | $14,466,727 | 3.51% |
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| JACOB ASSET MANAGEMENT OF NEW YORK LLC | 322,594 | $2,567,848 | 2.89% |
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| Millrace Asset Group, Inc. | 322,845 | $2,570 | 2.69% |
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| First Washington CORP | 706,172 | $5,621,129 | 2.46% |
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| Mesirow Financial Investment Management, Inc. | 60,144 | $478,746 | 2.03% |
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| PERKINS CAPITAL MANAGEMENT INC | 260,350 | $2,072 | 1.81% |
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| Archon Capital Management LLC | 1,054,465 | $8,393,541 | 1.74% |
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| Abrams Capital Management | 7,180,000 | $57,152,800 | 1.64% |
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| Bullseye Asset Management LLC | 334,186 | $2,661 | 1.34% |
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| TOWERVIEW LLC | 200,000 | $1,592,000 | 1.04% |
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| Antara Capital LP | 3,815,600 | $30,372,176 | 1.00% |
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| S Squared Technology, LLC | 227,393 | $1,810,048 | 0.90% |
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| Acuitas Investments, LLC | 187,100 | $1,489,316 | 0.87% |
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| FORMULA GROWTH LTD | 302,789 | $2,410,200 | 0.77% |
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| EAM Investors, LLC | 429,254 | $3,416,862 | 0.63% |
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| Manatuck Hill Partners, LLC | 160,000 | $1,273,600 | 0.60% |
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| Trellus Management Company, LLC | 59,254 | $471,662 | 0.58% |
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| HEARTLAND ADVISORS INC | 900,000 | $7,164,000 | 0.41% |
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