| Grace Brothers Management, LLC |
5,363,073 |
33.61 |
-- |
5/29/18 |
| Dimensional Fund Advisors, L.P. |
1,050,208 |
6.58 |
28,769 |
9/30/18 |
| NGP Energy Technology Partners, L.P. |
950,721 |
5.96 |
-- |
5/29/18 |
| Eliot Rose Asset Management, L.L.C. |
727,090 |
4.56 |
-502,625 |
12/31/17 |
| Wellington Management Company, LLP |
642,427 |
4.03 |
-179,544 |
9/30/18 |
| Thomson Horstmann & Bryant, Inc. |
588,813 |
3.69 |
37,792 |
9/30/18 |
| The Vanguard Group, Inc. |
443,699 |
2.78 |
116,125 |
9/30/18 |
| Franklin Advisory Services, LLC |
426,600 |
2.67 |
-- |
9/30/18 |
| Global X Management Company LLC |
345,939 |
2.17 |
-17,906 |
6/30/18 |
| NorthPointe Capital, LLC |
334,044 |
2.09 |
-78,089 |
9/30/18 |
| Mirae Asset Global Investments (USA) LLC |
317,511 |
1.99 |
317,511 |
9/30/18 |
| Popielec (Michael D) |
270,288 |
1.69 |
-- |
5/29/18 |
| Renaissance Technologies LLC |
258,100 |
1.62 |
10,834 |
9/30/18 |
| Monashee Investment Management, LLC |
250,000 |
1.57 |
250,000 |
9/30/18 |
| Bridgeway Capital Management, Inc. |
202,000 |
1.27 |
-35,000 |
9/30/18 |
| Essex Investment Management Company, LLC |
182,017 |
1.14 |
74,688 |
9/30/18 |
| Manatuck Hill Partners, LLC |
140,801 |
0.88 |
-- |
9/30/18 |
| Algert Global LLC |
123,734 |
0.78 |
-821 |
9/30/18 |
| Singh (Ranjit C) |
79,801 |
0.50 |
-- |
5/29/18 |
| Geode Capital Management, L.L.C. |
70,804 |
0.44 |
959 |
9/30/18 |
| Fain (Philip A) |
70,000 |
0.44 |
-- |
5/29/18 |
| Saeli (Thomas Louis) |
58,446 |
0.37 |
6,200 |
5/29/18 |
| Municipal Employees' Retirement System of Michigan |
53,810 |
0.34 |
-- |
6/30/18 |
| Shaw (Robert W II) |
50,000 |
0.31 |
-- |
5/29/18 |
| Acadian Asset Management LLC |
36,011 |
0.23 |
-1,498 |
9/30/18 |
| BlackRock Institutional Trust Company, N.A. |
32,629 |
0.20 |
1,354 |
9/30/18 |
| California Public Employees' Retirement System |
31,400 |
0.20 |
-- |
9/30/18 |
| Deutsche Asset Management Americas |
26,600 |
0.17 |
-966 |
9/30/18 |
| Shikiar Asset Management, Inc. |
26,000 |
0.16 |
-- |
9/30/18 |
| Northern Trust Investments, Inc. |
25,577 |
0.16 |
-- |
9/30/18 |
| Teton Advisors, Inc. |
25,000 |
0.16 |
-- |
9/30/18 |
| J.P. Morgan Securities LLC |
19,200 |
0.12 |
3,808 |
9/30/18 |
| Anderson (Steven Mark) |
18,500 |
0.12 |
-- |
5/29/18 |
| Carosa Stanton Asset Management, LLC |
17,400 |
0.11 |
-- |
4/30/18 |
| O'Shaughnessy Asset Management, LLC |
14,287 |
0.09 |
-17,931 |
9/30/18 |
| State Street Global Advisors (US) |
10,458 |
0.07 |
6,360 |
9/30/18 |
| Saturna Capital Corporation |
10,000 |
0.06 |
-- |
9/30/18 |
| Vericimetry Advisors LLC |
9,900 |
0.06 |
-- |
6/30/18 |
| Invesco Capital Management LLC |
8,968 |
0.06 |
-549 |
9/30/18 |
| Morgan Stanley Wealth Management |
8,408 |
0.05 |
-1,374 |
9/30/18 |
| T. Rowe Price Associates, Inc. |
5,800 |
0.04 |
-- |
9/30/18 |
| Guggenheim Investments |
5,004 |
0.03 |
-- |
1/31/18 |
| Barclays Capital Inc. |
4,510 |
0.03 |
4,475 |
9/30/18 |
| Dimensional Fund Advisors, Ltd. |
3,705 |
0.02 |
-- |
9/30/18 |
| Bank of America Merrill Lynch (US) |
3,000 |
0.02 |
-- |
9/30/18 |
| Northern Trust Global Investments |
2,282 |
0.01 |
-- |
9/30/18 |
| Morgan Stanley & Co. LLC |
1,931 |
0.01 |
1,775 |
9/30/18 |
| Prelude Capital Management, LLC |
1,879 |
0.01 |
-885 |
9/30/18 |
| AXA Rosenberg Investment Management LLC |
1,750 |
0.01 |
-- |
9/30/18 |
| BlackRock Investment Management, LLC |
1,750 |
0.01 |
-- |
9/30/18 |
