Ownership Summary

Top Holders

Holder Shares Held % O/S Share Change Filing Date
Siemer (Arnold B) 2,126,564 6.86 -881,123 12/31/17
Renaissance Technologies LLC 2,040,873 6.58 218,773 12/31/17
Royce & Associates, LP 2,014,283 6.50 3,100 12/31/17
Dimensional Fund Advisors, L.P. 1,634,938 5.27 32,770 12/31/17
BlackRock Institutional Trust Company, N.A. 1,212,321 3.91 -82,337 12/31/17
The Vanguard Group, Inc. 1,203,529 3.88 60,355 12/31/17
Numeric Investors LLC 1,121,575 3.62 -343,897 12/31/17
Eagle Boston Investment Management, Inc. 1,070,592 3.45 46,912 12/31/17
Aristotle Capital Boston, LLC 974,008 3.14 95,958 12/31/17
Millennium Management LLC 685,955 2.21 580,385 12/31/17

Top Holders: Mutual Funds

Fund Shares Held % O/S Share Change Filing Date
Royce Opportunity Fund 981,114 3.16 -5,900 12/31/17
Legg Mason Royce US Small Cap Opportunity Fund 735,495 2.37 30,450 2/28/18
Vanguard Total Stock Market Index Fund 669,377 2.16 6,300 2/28/18
DFA U.S. Small Cap Portfolio 577,137 1.86 142,630 1/31/18
iShares Russell 2000 ETF 504,107 1.63 -4,459 3/31/18
Vanguard Extended Market Index Fund 375,845 1.21 -830 2/28/18
iShares Russell 2000 Growth ETF 209,196 0.67 -2,821 3/31/18
DFA U.S. Micro Cap Portfolio 177,398 0.57 7,931 1/31/18
Legg Mason IF Royce US Smaller Companies Fund 154,674 0.50 154,674 2/28/18
KP Small Cap Equity Fund;Instl 151,347 0.49 -3,000 9/30/17

* Insider values reflect direct beneficial ownership.

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