| Whitnell & Co. | 4.42K | Dec 31, 19 | -- | -- |
| LADENBURG THALMANN FINANCIAL SERVICES INC. | 888 | Dec 31, 19 | +500 | -- |
| Concourse Capital Management, LLC | -- | Dec 31, 19 | -71.86K | -- |
| EAGLE BOSTON INVESTMENT MANAGEMENT INC | 144.80K | Jun 30, 19 | -664 | -- |
| MENTA CAPITAL LLC | 58.40K | Jun 30, 19 | +46.60K | -- |
| TIAA CREF INVESTMENT MANAGEMENT LLC | 90.59K | Mar 31, 19 | -- | -- |
| TEACHERS ADVISORS, LLC | 88.02K | Mar 31, 19 | +1.58K | -- |
| Jump Trading, LLC | 25.70K | Mar 31, 19 | +25.70K | -- |
| Evanston Investments, Inc., dba Evanston Advisors | 10.00K | Dec 31, 18 | -- | -- |
| Delpha Capital Management, LLC | -- | Mar 31, 18 | -1.45K | -- |
| I.G. INVESTMENT MANAGEMENT, LTD. | 98.19K | Sep 30, 17 | +98.19K | -- |
| SPOT TRADING L.L.C. | -- | Sep 30, 17 | -170 | -- |
| Acrospire Investment Management LLC | -- | Sep 30, 17 | -3.04K | -- |
| Century Capital Management, LLC | 84.58K | Jun 30, 17 | +84.58K | -- |
| TFS CAPITAL LLC | -- | Jun 30, 17 | -36.11K | -- |
| KALMAR INVESTMENTS INC /DE/ | 448.64K | Mar 31, 17 | -193.58K | -- |
| BlackRock Institutional Trust Company, N.A. | 1.43M | Dec 31, 16 | +155.65K | -- |
| BlackRock Fund Advisors | 1.27M | Dec 31, 16 | +197.99K | -- |
| BlackRock Investment Management, LLC | 148.06K | Dec 31, 16 | -889 | -- |
| BLACKROCK ADVISORS LLC | 113.16K | Dec 31, 16 | +14.26K | -- |
| BlackRock Group LTD | 49.51K | Dec 31, 16 | +25.41K | -- |
| BlackRock Japan Co. Ltd | 5.03K | Dec 31, 16 | +429 | -- |
| MSI Financial Services Inc | 236 | Dec 31, 16 | -10.98K | -- |
| Emerald Acquisition Ltd. | 535.87K | Sep 30, 16 | +331.21K | -- |
| RUSSELL FRANK CO/ | 9.40K | Mar 31, 16 | +9.40K | -- |
| Alerus Investment Advisors Corp | 102 | Mar 31, 16 | +102 | -- |
| WHV Investments, Inc. | -- | Mar 31, 16 | -78.81K | -- |
| Headlands Capital Management, LLC | 2.27M | Dec 31, 15 | +2.27M | -- |
| CLIFTON PARK CAPITAL MANAGEMENT, LLC | 1.44M | Dec 31, 15 | -574.39K | -- |
| OMT Capital Management LLC | 456.64K | Dec 31, 15 | -196.36K | -- |
| BRYN MAWR CAPITAL MANAGEMENT INC | 18.71K | Sep 30, 15 | -9.48K | -- |
| MANAGED ACCOUNT ADVISORS LLC | 368.54K | Jun 30, 15 | -26.70K | -- |
| Placemark Investments, Inc. | 98.93K | Dec 31, 14 | -8.82K | -- |
| UBS AG | 22.57K | Sep 30, 14 | +2.38K | -- |
| NORTHERN TRUST CO OF CONNECTICUT | -- | Dec 31, 13 | -544.96K | -- |
| MANULIFE INVESTMENT MANAGEMENT (US) LLC | 18.72K | Mar 31, 13 | +3.31K | -- |
| Manulife Investment Management (North America) Ltd | 12.76K | Mar 31, 13 | +296 | -- |
| LEHMAN BROTHERS HOLDINGS INC. PLAN TRUST | -- | Jun 30, 08 | -18.30K | -- |