| LADENBURG THALMANN FINANCIAL SERVICES INC. | -- | Dec 31, 19 | -3.75K | -- |
| Advisor Group, Inc. | -- | Dec 31, 19 | -13.53K | -- |
| Wilks Brothers, LLC | 421.81K | Sep 30, 19 | -517.10K | -- |
| Glacier Peak Capital LLC | 20.00K | Sep 30, 19 | +5.00K | -- |
| Glen Harbor Capital Management LLC | -- | Sep 30, 19 | -29.43K | -- |
| RIVERHEAD CAPITAL MANAGEMENT LLC | -- | Sep 30, 19 | -18.50K | -- |
| Meadow Creek Investment Management LLC | -- | Sep 30, 19 | -23.12K | -- |
| Columbia Pacific Advisors, LLC | -- | Sep 30, 19 | -153.89K | -- |
| Flinton Capital Management LLC | -- | Sep 30, 19 | -16.82K | -- |
| FORESTERS INVESTMENT MANAGEMENT COMPANY, INC. | -- | Sep 30, 19 | -370.90K | -- |
| Elkfork Partners LLC | -- | Sep 30, 19 | -35.73K | -- |
| TEACHERS ADVISORS, LLC | 202.46K | Mar 31, 19 | -- | -- |
| TIAA CREF INVESTMENT MANAGEMENT LLC | 153.94K | Mar 31, 19 | -4.91K | -- |
| OppenheimerFunds, Inc. | 55.82K | Mar 31, 19 | -49.71K | -- |
| Jump Trading, LLC | -- | Mar 31, 19 | -20.06K | -- |
| Mobius Capital Management, LLC | -- | Sep 30, 18 | -59.25K | -- |
| PEAK6 Group LLC | 7.69K | Jun 30, 18 | -11.62K | -- |
| FORTALEZA ASSET MANAGEMENT INC/ | 1.97K | Jun 30, 18 | +1.97K | -- |
| Delpha Capital Management, LLC | -- | Mar 31, 18 | -741 | -- |
| Numeric Investors LLC | -- | Dec 31, 17 | -168.41K | -- |
| CROFT-LEOMINSTER INC | -- | Dec 31, 17 | -18.80K | -- |
| I.G. INVESTMENT MANAGEMENT, LTD. | 500.00K | Sep 30, 17 | +500.00K | -- |
| Scoria Capital Partners LP | 20.00K | Sep 30, 17 | +20.00K | -- |
| SPOT TRADING L.L.C. | 4.37K | Sep 30, 17 | -6.16K | -- |
| Airain ltd | 130.81K | Jun 30, 17 | +104.80K | -- |
| Virtu KCG Holdings LLC | 65.36K | Jun 30, 17 | +43.49K | -- |
| CAPSTONE ASSET MANAGEMENT CO | 11.51K | Jun 30, 17 | -690 | -- |
| IRONBRIDGE CAPITAL MANAGEMENT LP | 324.63K | Mar 31, 17 | -31.43K | -- |
| Spot Trading L.L.C | 8.16K | Mar 31, 17 | +8.16K | -- |
| BlackRock Fund Advisors | 4.98M | Dec 31, 16 | +1.02M | -- |
| BlackRock Institutional Trust Company, N.A. | 1.67M | Dec 31, 16 | +193.77K | -- |
| BlackRock Investment Management, LLC | 569.70K | Dec 31, 16 | +73.77K | -- |
| BLACKROCK ADVISORS LLC | 357.89K | Dec 31, 16 | -3.62K | -- |
| BlackRock Group LTD | 161.11K | Dec 31, 16 | +59.52K | -- |
| NEW CENTURY INVESTMENT MANAGEMENT, INC | 8.90K | Dec 31, 16 | -13.30K | -- |
| BlackRock Japan Co. Ltd | 3.65K | Dec 31, 16 | +2.84K | -- |
| KANALY TRUST CO | 1.30K | Dec 31, 16 | -- | -- |
| MSI Financial Services Inc | 25 | Dec 31, 16 | -4 | -- |
| CenterStar Fund, LLC | 20 | Dec 31, 16 | +20 | -- |
| Emerald Acquisition Ltd. | 127.80K | Sep 30, 16 | +10.04K | -- |
| RS INVESTMENT MANAGEMENT CO LLC | 292.40K | Jun 30, 16 | -41.33K | -- |
| ARBOR CAPITAL MANAGEMENT LLC | 38.16K | Jun 30, 16 | -15.30K | -- |
| Visium Asset Management, LP | -- | Jun 30, 16 | -194.25K | -- |
| Apex Capital Management | 1.31M | Mar 31, 16 | +97.90K | -- |
| FIDUCIARY MANAGEMENT ASSOCIATES LLC | 549.83K | Mar 31, 16 | -154.83K | -- |
| RUSSELL FRANK CO/ | 123.10K | Mar 31, 16 | +40.95K | -- |
| VIRGINIA RETIREMENT SYSTEM | 8.70K | Mar 31, 16 | +8.70K | -- |
| Gupta Wealth Management LLC | 4.11K | Mar 31, 16 | -- | -- |
| BENNETT LAWRENCE MANAGEMENT L L C/NY | 63.45K | Dec 31, 15 | -23.91K | -- |
| Santa Fe Partners LLC | 43.93K | Dec 31, 15 | +43.93K | -- |
| Schonfeld Group Holdings LLC | 34.54K | Dec 31, 15 | +34.54K | -- |
| Adirondack Funds | 34.80K | Sep 30, 15 | +34.80K | -- |
| OFI Advisors LLC | 9.70K | Sep 30, 15 | +2.43K | -- |
| Index Management Solutions, LLC | 101 | Sep 30, 15 | +101 | -- |
| Absolute Return Capital, LLC | -- | Sep 30, 15 | -6.30K | -- |
| MANAGED ACCOUNT ADVISORS LLC | 391.34K | Jun 30, 15 | +29.02K | -- |
| JASINKIEWICZ CAPITAL MANAGEMENT, LP | 45.00K | Mar 31, 15 | +45.00K | -- |
| Kames Capital Management Ltd | 25.78K | Dec 31, 14 | +25.78K | -- |
| MUNDER CAPITAL MANAGEMENT | 607.07K | Sep 30, 14 | -1.20K | -- |
| Nexus Asset Management LLC | 243.63K | Sep 30, 14 | +177.09K | -- |
| QS BATTERYMARCH FINANCIAL MANAGEMENT, INC | 81.33K | Sep 30, 14 | -8.08K | -- |
| BlueCrest Capital Management LLP | 33.38K | Sep 30, 14 | +13.75K | -- |
| UBS AG | 31.55K | Sep 30, 14 | -4.11K | -- |
| SEI TRUST CO | 26.12K | Sep 30, 14 | -5.31K | -- |
| Perimeter Capital Partners, LLC | 3.92K | Sep 30, 14 | -17.93K | -- |
| Savitr Capital, LLC | 10.00K | Jun 30, 14 | +10.00K | -- |
| Wilmington Funds Management Corp | 8.67K | Jun 30, 14 | +4.86K | -- |
| CHARTWELL INVESTMENT PARTNERS/PA | 359.35K | Mar 31, 14 | +359.35K | -- |
| SAC Capital Advisors LP | 9.13K | Mar 31, 14 | -20.83K | -- |
| SIGMA CAPITAL MANAGEMENT LLC | -- | Mar 31, 14 | -20.59K | -- |
| CONNOR CLARK & LUNN INVESTMENT MANAGEMENT LTD | 18.10K | Dec 31, 13 | +18.10K | -- |
| Jane Street Holding, LLC | 4.75K | Dec 31, 13 | +4.75K | -- |
| NORTHERN TRUST CO OF CONNECTICUT | -- | Dec 31, 13 | -22.95K | -- |
| Fiera Capital Inc. | 17.00K | Sep 30, 13 | -- | -- |
| KNIGHT CAPITAL GROUP LLC | 10.32K | Jun 30, 13 | -174 | -- |
| Irish Life Investment Managers Ltd. | 1.07K | Jun 30, 13 | -- | -- |
| MANULIFE INVESTMENT MANAGEMENT (US) LLC | 18.86K | Mar 31, 13 | -246 | -- |
| Manulife Investment Management (North America) Ltd | 14.25K | Mar 31, 13 | +437 | -- |
| LEHMAN BROTHERS HOLDINGS INC. PLAN TRUST | 4.74K | Jun 30, 08 | -50.34K | -- |
| RBC CMA LLC | 5.94K | Jun 30, 06 | +5.94K | -- |
| AMERICAN CENTURY INVESTMENT MANAGEMENT INC | -- | Dec 31, 04 | -40.23K | -- |
| RBC Capital Markets, LLC | 405 | Mar 31, 01 | +405 | -- |