OWNERSHIP PROFILE

SHAREHOLDER BREAKDOWN

Shareholder Holders Value ($MM) % O/S Shares
Institution 60 97.84 78.50 12,492,630
Mutual Fund 53 19.13 14.24 2,266,712
Insider 5 6.41 5.26 837,636

INSTITUTIONAL SHAREHOLDER ROTATION

Shareholder Holders Value Chg ($MM) % O/S Share Change
Buyers 20 9.78 6.59 1,049,343
Sellers 24 -6.54 5.35 -851,403
Net -- 3.24 1.24 197,940

INSTITUTIONAL SHAREHOLDER CONCENTRATION

Value ($MM) % O/S Shares
Total Inst. 97.84 78.50 12,492,630
Top 10 Inst. 79.83 66.63 10,603,957
Top 20 Inst. 92.95 75.23 11,971,880
Top 50 Inst. 97.77 78.46 12,485,881

INSTITUTIONAL SHAREHOLDER STYLE

Holders Value ($MM) % Inst Shares Shares
Growth 10 14.41 9.05 1,440,936
Aggressive Growth 3 3.78 2.38 378,127
Core Growth 7 10.63 6.68 1,062,809
Income 3 0.30 0.19 30,208
Income Value 3 0.30 0.19 30,208
Index 8 8.27 5.20 827,963
Other 16 49.94 45.70 7,272,973
Broker Dealer 3 0.04 0.03 4,348
GARP 4 4.18 2.66 423,682
Hedge Fund 8 39.64 37.04 5,894,222
VC/Private Equi 1 6.08 5.97 950,721
Value 12 20.44 14.43 2,296,115
Core Value 7 20.00 14.15 2,252,485
Deep Value 5 0.44 0.27 43,630

TOP HOLDERS: INSTITUTIONAL INVESTOR

Holder Shares Held % O/S Share Change Filing Date
Grace Brothers Management, LLC 5,363,073 33.70 197,936 5/22/17
Dimensional Fund Advisors, L.P. 976,109 6.13 21,531 3/31/18
NGP Energy Technology Partners, L.P. 950,721 5.97 -- 5/22/17
Wellington Management Company, LLP 821,971 5.17 58,027 3/31/18
Eliot Rose Asset Management, L.L.C. 727,090 4.57 -502,625 12/31/17
Franklin Advisory Services, LLC 426,600 2.68 -- 3/31/18
Thomson Horstmann & Bryant, Inc. 396,767 2.49 396,767 3/31/18
Global X Management Company LLC 363,845 2.29 23,982 3/31/18
The Vanguard Group, Inc. 307,493 1.93 19,867 3/31/18
Popielec (Michael D) 270,288 1.70 10,000 5/22/17
NorthPointe Capital, LLC 244,070 1.53 244,070 3/31/18
Bridgeway Capital Management, Inc. 237,000 1.49 -- 3/31/18
Renaissance Technologies LLC 228,499 1.44 -18,901 3/31/18
Algert Global LLC 139,980 0.88 5,885 3/31/18
Manatuck Hill Partners, LLC 130,801 0.82 55,201 3/31/18
Essex Investment Management Company, LLC 116,127 0.73 -8,840 3/31/18
Singh (Ranjit C) 79,801 0.50 -- 5/22/17
Fain (Philip A) 70,000 0.44 3,552 12/15/17
Geode Capital Management, L.L.C. 63,199 0.40 -- 3/31/18
Saeli (Thomas Louis) 58,446 0.37 2,200 5/11/18
Municipal Employees' Retirement System of Michigan 53,810 0.34 -- 3/31/18
Shaw (Robert W II) 50,000 0.31 1,720 11/7/17
Deutsche Asset Management Americas 37,900 0.24 -29,974 3/31/18
Acadian Asset Management LLC 37,447 0.24 -17,431 3/31/18
O'Shaughnessy Asset Management, LLC 35,101 0.22 -7,167 3/31/18
California Public Employees' Retirement System 31,400 0.20 -- 3/31/18
BlackRock Institutional Trust Company, N.A. 28,418 0.18 -83,458 3/31/18
Shikiar Asset Management, Inc. 26,000 0.16 -1,500 3/31/18
Northern Trust Investments, Inc. 25,577 0.16 -171 3/31/18
Teton Advisors, Inc. 25,000 0.16 -- 3/31/18
Anderson (Steven Mark) 18,500 0.12 7,045 5/22/17
Principal Funds, Inc. 17,903 0.11 -- 3/31/18
Carosa Stanton Asset Management, LLC 17,400 0.11 -- 1/31/18
Spark Investment Management LLC 15,700 0.10 -37,300 3/31/18
Alambic Investment Management, L.P. 13,100 0.08 -3,300 3/31/18
BlueCrest Capital Management LLP 10,662 0.07 10,662 3/31/18
Saturna Capital Corporation 10,000 0.06 -- 3/31/18
Morgan Stanley Wealth Management 8,717 0.05 100 3/31/18
BNY Mellon Asset Management 7,108 0.04 -6,271 3/31/18
T. Rowe Price Associates, Inc. 5,800 0.04 -- 3/31/18
Prelude Capital Management, LLC 5,107 0.03 -- 3/31/18
Guggenheim Investments 5,004 0.03 -- 1/31/18
UBS Financial Services, Inc. 4,807 0.03 4,807 3/31/18
BNY Mellon Asset Management North America Corporation 4,545 0.03 4,545 3/31/18
Bank of America Merrill Lynch (US) 4,053 0.03 1,053 3/31/18
Invesco Advisers, Inc. 3,715 0.02 -- 4/30/18
State Street Global Advisors (US) 3,486 0.02 956 4/30/18
Brandywine Global Investment Management, LLC 2,959 0.02 2,959 3/31/18
Dimensional Fund Advisors, Ltd. 2,500 0.02 -- 3/31/18
Northern Trust Global Investments 2,282 0.01 -- 3/31/18

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* Insider values reflect direct beneficial ownership.