Ownership Profile

Shareholder Breakdown

Shareholder Holders Value ($MM) % O/S Shares
Institution 40 16.93 60.80 19,352,321
Mutual Fund 13 0.45 1.57 498,311
Insider 2 2.01 1.31 415,845

Institutional Shareholder Rotation

Shareholder Holders Value Chg ($MM) % O/S Share Change
Buyers 15 7.12 27.83 8,859,137
Sellers 12 -0.32 0.76 -241,543
Net -- 6.80 27.07 8,617,594

Institutional Shareholder Concentration

Value ($MM) % O/S Shares
Total Inst. 16.93 60.80 19,352,321
Top 10 Inst. 16.31 58.49 18,618,998
Top 20 Inst. 16.85 60.52 19,264,599
Top 50 Inst. 16.93 60.80 19,352,321

Institutional Shareholder Style

Holders Value ($MM) % Inst Shares Shares
Growth 5 2.05 9.70 3,088,876
Aggressive Growth 1 0.05 0.20 65,000
Core Growth 2 0.02 0.07 21,876
Growth 2 1.98 9.43 3,002,000
Income 1 -- 0.01 3,758
Income Value 1 -- 0.01 3,758
Index 5 0.72 2.77 883,017
Other 12 5.74 18.13 5,771,941
Broker Dealer 5 0.37 1.43 454,548
GARP 1 -- 0.01 3,475
Hedge Fund 5 0.77 1.48 472,327
VC/Private Equi 1 4.60 15.21 4,841,591
Value 7 0.02 0.06 17,545
Core Value 4 0.01 0.03 9,074
Deep Value 3 0.01 0.03 8,471

Top Holders: Institutional Investor

Fund Shares Held % O/S Share Change Filing Date
Vanguard Total Stock Market Index Fund 239,630 0.75 145,979 12/31/17
Vanguard Extended Market Index Fund 85,853 0.27 -- 12/31/17
Bridgeway Ultra-Small Company Market Fund 65,000 0.20 -- 6/30/17
iShares Micro-Cap ETF 36,039 0.11 1,536 12/31/17
Fidelity Extended Market Index Fund 33,461 0.11 -- 12/31/17
Fidelity NASDAQ Composite Index Fund 16,656 0.05 -- 12/31/17
Fidelity Total Market Index Fund 6,105 0.02 -- 12/31/17
Wilshire Micro-Cap ETF 4,764 0.01 -595 12/31/17
iShares Core S&P Total U.S. Stock Market ETF 4,032 0.01 236 12/31/17
1290 VT Micro Cap Portfolio 2,745 0.01 -- 11/30/17
Legg Mason Small-Cap Quality Value ETF 2,486 0.01 2,486 8/31/17
Vanguard US Equity Index Fund 1,400 -- -- 10/31/17
Vanguard US Total Market Index ETF 140 -- 140 9/30/17

Top Holders

Holder Shares Held % O/S Share Change Filing Date
Third Rock Ventures, LLC 4,841,591 15.21 -- 10/31/17
TRV GP, L.L.C. 4,841,591 15.21 4,841,591 12/31/17
Clairmark Investments, Ltd. 3,582,328 11.25 -- 10/31/17
Empery Asset Management, L.P. 3,000,000 9.42 3,000,000 11/1/17
BlackRock Institutional Trust Company, N.A. 442,718 1.39 1,772 12/31/17
Virtu Americas LLC 427,048 1.34 388,502 12/31/17
Celniker (Abbie C) 409,915 1.29 -- 10/31/17
Hurly (Stephen A.) 398,031 1.25 -- 10/31/17
Sabby Management, LLC 348,893 1.10 348,893 12/31/16
The Vanguard Group, Inc. 326,883 1.03 142,579 12/31/17
Municipal Employees' Retirement System of Michigan 241,640 0.76 -- 12/31/17
Lynch (Daniel S) 70,879 0.22 -- 10/31/17
Two Sigma Investments, LP 65,152 0.20 65,152 12/31/17
Bridgeway Capital Management, Inc. 65,000 0.20 -- 12/31/17
Geode Capital Management, L.L.C. 56,222 0.18 -- 12/31/17
Parallax Volatility Advisers, L.P. 36,761 0.12 36,761 12/31/17
Mellon Capital Management Corporation 36,601 0.11 1 12/31/17
Tubridy (Karen L) 32,753 0.10 -- 10/31/17
Northern Trust Investments, Inc. 20,593 0.06 -- 12/31/17
Fiduciary Trust Company 20,000 0.06 -- 12/31/17
Wedbush Securities, Inc. 16,214 0.05 16,214 12/31/17
Citadel LLC 15,372 0.05 -7,375 12/31/17
Morgan Stanley & Co. LLC 10,186 0.03 5,056 12/31/17
Acrospire Investment Management LLC 6,149 0.02 -300 6/30/17
McCabe (John J) 5,930 0.02 -- 10/31/17
Guggenheim Investments 5,324 0.02 5,324 3/31/17
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
AXA Rosenberg Investment Management LLC 2,745 0.01 -- 11/30/17
BlackRock Investment Management, LLC 2,745 0.01 -- 12/31/17
Royce & Associates, LP 2,486 0.01 2,486 8/31/17
Independent Financial Partners 2,000 0.01 -- 12/31/17
Morgan Stanley Wealth Management 1,876 0.01 -- 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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