OWNERSHIP SUMMARY

Top Holders

Holder Shares Held % O/S Share Change Filing Date
BlackRock Institutional Trust Company, N.A. 2,500,491 12.03 288,445 3/31/18
The Vanguard Group, Inc. 1,800,342 8.66 52,033 3/31/18
Dimensional Fund Advisors, L.P. 1,211,415 5.83 7,303 3/31/18
RE Advisers Corporation 831,230 4.00 -- 3/31/18
Millennium Management LLC 823,231 3.96 -202,305 3/31/18
Arthur Zaske & Associates, LLC 744,110 3.58 -339,322 12/31/17
Neuberger Berman, LLC 677,061 3.26 -96,792 3/31/18
State Street Global Advisors (US) 511,718 2.46 -23,539 3/31/18
Baron Capital Management, Inc. 500,000 2.41 -- 3/31/18
Maverick Capital, Ltd. 481,360 2.32 256,821 3/31/18

Top Holders: Mutual Funds

Fund Shares Held % O/S Share Change Filing Date
iShares Core S&P Small-Cap ETF 896,733 4.31 30,997 4/30/18
Homestead Small Company Stock Fund 657,427 3.16 -- 12/31/17
Baron Small Cap Fund 500,000 2.41 -500,000 12/31/17
Vanguard Total Stock Market Index Fund 486,025 2.34 11,499 4/30/18
Vanguard Small-Cap Index Fund 472,188 2.27 4,181 4/30/18
iShares Russell 2000 ETF 407,621 1.96 15,054 4/30/18
Statens Pensjonsfond Utland 400,919 1.93 222,043 12/31/17
Vanguard Small-Cap Growth Index Fund 270,134 1.30 1,683 4/30/18
DFA U.S. Small Cap Portfolio 269,487 1.30 4,415 1/31/18
DFA U.S. Micro Cap Portfolio 234,694 1.13 -- 1/31/18

* Insider values reflect direct beneficial ownership.

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