| Grace Brothers Management, LLC |
5,363,073 |
34.25 |
-- |
5/29/18 |
| Dimensional Fund Advisors, L.P. |
1,060,836 |
6.77 |
10,628 |
12/31/18 |
| NGP Energy Technology Partners, L.P. |
950,721 |
6.07 |
-- |
5/29/18 |
| Eliot Rose Asset Management, L.L.C. |
727,090 |
4.64 |
-502,625 |
12/31/17 |
| Wellington Management Company, LLP |
642,427 |
4.10 |
-- |
12/31/18 |
| Thomson Horstmann & Bryant, Inc. |
635,400 |
4.06 |
46,587 |
12/31/18 |
| The Vanguard Group, Inc. |
444,652 |
2.84 |
953 |
12/31/18 |
| Franklin Mutual Advisers, LLC |
426,600 |
2.72 |
426,600 |
12/31/18 |
| Global X Management Company LLC |
345,939 |
2.21 |
-17,906 |
6/30/18 |
| Popielec (Michael D) |
270,288 |
1.73 |
-- |
5/29/18 |
| Renaissance Technologies LLC |
266,000 |
1.70 |
7,900 |
12/31/18 |
| NorthPointe Capital, LLC |
232,823 |
1.49 |
-101,221 |
12/31/18 |
| Monashee Investment Management, LLC |
223,155 |
1.43 |
-26,845 |
12/31/18 |
| Mirae Asset Global Investments (USA) LLC |
214,515 |
1.37 |
-102,996 |
12/31/18 |
| Bridgeway Capital Management, Inc. |
177,000 |
1.13 |
-25,000 |
12/31/18 |
| Essex Investment Management Company, LLC |
170,586 |
1.09 |
-11,431 |
12/31/18 |
| Fain (Philip A) |
92,229 |
0.59 |
22,229 |
12/28/18 |
| Algert Global LLC |
85,089 |
0.54 |
-38,645 |
12/31/18 |
| Singh (Ranjit C) |
79,801 |
0.51 |
-- |
5/29/18 |
| Geode Capital Management, L.L.C. |
70,804 |
0.45 |
-- |
12/31/18 |
| Saeli (Thomas Louis) |
60,446 |
0.39 |
2,000 |
11/14/18 |
| Teton Advisors, Inc. |
59,300 |
0.38 |
34,300 |
12/31/18 |
| Shaw (Robert W II) |
52,000 |
0.33 |
2,000 |
12/14/18 |
| Manatuck Hill Partners, LLC |
48,299 |
0.31 |
-92,502 |
12/31/18 |
| Acadian Asset Management LLC |
36,011 |
0.23 |
-- |
12/31/18 |
| BlackRock Institutional Trust Company, N.A. |
32,674 |
0.21 |
45 |
12/31/18 |
| California Public Employees' Retirement System |
31,400 |
0.20 |
-- |
12/31/18 |
| Shikiar Asset Management, Inc. |
26,000 |
0.17 |
-- |
12/31/18 |
| Deutsche Asset Management Americas |
25,600 |
0.16 |
-1,000 |
12/31/18 |
| Northern Trust Investments, Inc. |
25,277 |
0.16 |
-300 |
12/31/18 |
| Alambic Investment Management, L.P. |
20,899 |
0.13 |
20,899 |
12/31/18 |
| Anderson (Steven Mark) |
18,500 |
0.12 |
-- |
5/29/18 |
| Carosa Stanton Asset Management, LLC |
17,400 |
0.11 |
-- |
10/31/18 |
| O'Shaughnessy Asset Management, LLC |
11,469 |
0.07 |
-2,818 |
12/31/18 |
| Barclays Capital Inc. |
11,433 |
0.07 |
6,923 |
12/31/18 |
| State Street Global Advisors (US) |
10,116 |
0.06 |
-342 |
12/31/18 |
| Saturna Capital Corporation |
10,000 |
0.06 |
-- |
12/31/18 |
| Morgan Stanley Wealth Management |
8,652 |
0.06 |
244 |
12/31/18 |
| T. Rowe Price Associates, Inc. |
5,800 |
0.04 |
-- |
12/31/18 |
| Guggenheim Investments |
5,591 |
0.04 |
33 |
7/31/17 |
| Prelude Capital Management, LLC |
5,349 |
0.03 |
3,470 |
12/31/18 |
| Tower Research Capital LLC |
5,264 |
0.03 |
4,147 |
12/31/18 |
| Vericimetry Advisors LLC |
5,000 |
0.03 |
-4,900 |
9/30/18 |
| Dimensional Fund Advisors, Ltd. |
3,705 |
0.02 |
-- |
12/31/18 |
| Invesco Capital Management LLC |
3,635 |
0.02 |
-5,333 |
12/31/18 |
| Northern Trust Global Investments |
1,982 |
0.01 |
-300 |
12/31/18 |
| AXA Rosenberg Investment Management LLC |
1,939 |
0.01 |
189 |
12/31/18 |
| BlackRock Investment Management, LLC |
1,939 |
0.01 |
189 |
12/31/18 |
| Morgan Stanley & Co. LLC |
1,813 |
0.01 |
-118 |
12/31/18 |
| Capital Advisors, Ltd., LLC |
580 |
-- |
-- |
12/31/18 |
