Ownership Profile

Shareholder Breakdown

Shareholder Holders Value ($MM) % O/S Shares
Institution 40 19.75 45.38 19,563,103
Mutual Fund 14 0.59 1.41 608,555
Insider -- -- -- --

Institutional Shareholder Rotation

Shareholder Holders Value Chg ($MM) % O/S Share Change
Buyers 15 9.08 20.22 8,715,702
Sellers 6 -0.06 0.18 -78,279
Net -- 9.02 20.04 8,637,423

Institutional Shareholder Concentration

Value ($MM) % O/S Shares
Total Inst. 19.75 45.38 19,563,103
Top 10 Inst. 19.14 43.68 18,829,745
Top 20 Inst. 19.67 45.18 19,475,346
Top 50 Inst. 19.75 45.38 19,563,103

Institutional Shareholder Style

Holders Value ($MM) % Inst Shares Shares
Growth 5 2.05 7.17 3,088,876
Aggressive Growth 1 0.05 0.15 65,000
Core Growth 2 0.02 0.05 21,876
Growth 2 1.98 6.96 3,002,000
Income 1 -- 0.01 3,758
Income Value 1 -- 0.01 3,758
Index 5 0.72 2.05 883,017
Other 13 12.49 25.11 10,824,279
Broker Dealer 5 0.37 1.05 454,548
GARP 1 -- 0.01 3,475
Hedge Fund 6 7.04 12.82 5,524,665
VC/Private Equi 1 5.08 11.23 4,841,591
Value 7 0.02 0.04 17,580
Core Value 4 0.01 0.02 9,109
Deep Value 3 0.01 0.02 8,471

Top Holders: Institutional Investor

Fund Shares Held % O/S Share Change Filing Date
Vanguard Total Stock Market Index Fund 276,057 0.64 36,427 2/28/18
Vanguard Extended Market Index Fund 156,153 0.36 70,300 3/31/18
Bridgeway Ultra-Small Company Market Fund 65,000 0.15 -- 12/31/17
iShares Micro-Cap ETF 35,079 0.08 -960 3/31/18
Fidelity Extended Market Index Fund 33,461 0.08 -- 2/28/18
Fidelity NASDAQ Composite Index Fund 16,656 0.04 -- 2/28/18
Fidelity Total Market Index Fund 6,105 0.01 -- 2/28/18
Wilshire Micro-Cap ETF 5,359 0.01 595 3/31/18
iShares Core S&P Total U.S. Stock Market ETF 4,200 0.01 168 3/31/18
Vanguard Balanced Index Fund 3,500 0.01 3,500 3/31/18
1290 VT Micro Cap Portfolio 2,745 0.01 -- 2/28/18
Legg Mason Small-Cap Quality Value ETF 2,486 0.01 2,486 8/31/17
Vanguard US Equity Index Fund 1,400 -- -- 3/31/18
Vanguard US Total Market Index ETF 354 -- -17 2/28/18

Top Holders

Holder Shares Held % O/S Share Change Filing Date
Third Rock Ventures, LLC 4,841,591 11.23 -- 3/31/18
Clairmark Investments, Ltd. 3,582,328 8.31 -- 10/31/17
Sabby Management, LLC 3,187,251 7.39 2,838,358 3/21/18
Empery Asset Management, L.P. 3,000,000 6.96 3,000,000 11/1/17
Kingdon Capital Management, L.L.C. 2,213,980 5.14 2,213,980 4/3/18
BlackRock Institutional Trust Company, N.A. 442,718 1.03 1,772 12/31/17
Virtu Americas LLC 427,048 0.99 388,502 12/31/17
Celniker (Abbie C) 409,915 0.95 -- 10/31/17
Hurly (Stephen A.) 398,031 0.92 -- 10/31/17
The Vanguard Group, Inc. 326,883 0.76 142,579 12/31/17
Municipal Employees' Retirement System of Michigan 241,640 0.56 -- 12/31/17
Lynch (Daniel S) 70,879 0.16 -- 10/31/17
Two Sigma Investments, LP 65,152 0.15 65,152 12/31/17
Bridgeway Capital Management, Inc. 65,000 0.15 -- 12/31/17
Geode Capital Management, L.L.C. 56,222 0.13 -- 12/31/17
Parallax Volatility Advisers, L.P. 36,761 0.09 36,761 12/31/17
Mellon Capital Management Corporation 36,601 0.08 1 12/31/17
Tubridy (Karen L) 32,753 0.08 -- 10/31/17
Northern Trust Investments, Inc. 20,593 0.05 -- 12/31/17
Fiduciary Trust Company 20,000 0.05 -- 12/31/17
Wedbush Securities, Inc. 16,214 0.04 16,214 12/31/17
Citadel LLC 15,372 0.04 -7,375 12/31/17
Morgan Stanley & Co. LLC 10,186 0.02 5,056 12/31/17
Acrospire Investment Management LLC 6,149 0.01 -300 6/30/17
McCabe (John J) 5,930 0.01 -- 10/31/17
Guggenheim Investments 5,359 0.01 35 3/31/18
UBS Financial Services, Inc. 4,056 0.01 2,056 12/31/17
BNY Mellon Asset Management 3,758 0.01 -- 12/31/17
PanAgora Asset Management Inc. 3,475 0.01 -16,528 12/31/17
IHT Wealth Management, LLC 3,240 0.01 2,750 12/31/17
BlackRock Investment Management, LLC 2,745 0.01 -- 12/31/17
AXA Rosenberg Investment Management LLC 2,745 0.01 -- 2/28/18
Royce & Associates, LP 2,486 0.01 2,486 8/31/17
Independent Financial Partners 2,000 -- -- 12/31/17
Morgan Stanley Wealth Management 1,876 -- -- 12/31/17
Advantage Investment Management, LLC 1,000 -- -- 12/31/17
Citi Investment Research (US) 600 -- -- 12/31/17
RBC Capital Markets Wealth Management 500 -- -- 12/31/17
Cutler Group, LP 61 -- -- 12/31/17
RBC Capital Partners 5 -- -- 12/31/17

* Insider values reflect direct beneficial ownership.

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