| Advisor Group, Inc. | -- | Dec 31, 19 | -950 | -- |
| Manikay Partners, LLC | -- | Dec 31, 19 | -775.00K | -- |
| LADENBURG THALMANN FINANCIAL SERVICES INC. | -- | Dec 31, 19 | -2.87K | -- |
| BB BIOTECH AG | 2.77M | Mar 31, 19 | -- | -- |
| TIAA CREF INVESTMENT MANAGEMENT LLC | 750.77K | Mar 31, 19 | -644.84K | -- |
| TEACHERS ADVISORS, LLC | 129.99K | Mar 31, 19 | +1.25K | -- |
| Jump Trading, LLC | 14.50K | Mar 31, 19 | +14.50K | -- |
| SECOR Capital Advisors, LP | -- | Mar 31, 19 | -14.00K | -- |
| Opera Trading Capital | -- | Dec 31, 18 | -2.99K | -- |
| SENZAR ASSET MANAGEMENT, LLC | 85.56K | Jun 30, 18 | -737.33K | -- |
| CORNERSTONE CAPITAL MANAGEMENT HOLDINGS LLC. | 41.12K | Dec 31, 17 | +3.50K | -- |
| Numeric Investors LLC | 14.80K | Dec 31, 17 | +14.80K | -- |
| Virtu KCG Holdings LLC | 53.45K | Jun 30, 17 | +53.45K | -- |
| JANUS HENDERSON INVESTORS US LLC | 5.17M | Mar 31, 17 | +230.04K | -- |
| BlackRock Fund Advisors | 2.13M | Dec 31, 16 | +278.28K | -- |
| BlackRock Institutional Trust Company, N.A. | 1.25M | Dec 31, 16 | +127.22K | -- |
| BLACKROCK ADVISORS LLC | 261.02K | Dec 31, 16 | -24.45K | -- |
| BlackRock Investment Management, LLC | 182.69K | Dec 31, 16 | -5.98K | -- |
| EverPoint Asset Management, LLC | 110.00K | Dec 31, 16 | +10.00K | -- |
| BlackRock Group LTD | 52.13K | Dec 31, 16 | -13.50K | -- |
| BlackRock Japan Co. Ltd | 1.57K | Dec 31, 16 | +1.23K | -- |
| Emerald Acquisition Ltd. | 2.47K | Sep 30, 16 | +2.47K | -- |
| Apex Capital Management | 123.23K | Mar 31, 16 | +20.55K | -- |
| RUSSELL FRANK CO/ | -- | Mar 31, 16 | -2.85K | -- |
| APEX CAPITAL, LLC | 227.20K | Dec 31, 15 | +227.20K | -- |
| Bellevue Asset Management AG | 33.00K | Dec 31, 15 | -10.00K | -- |
| MANAGED ACCOUNT ADVISORS LLC | 73.72K | Jun 30, 15 | -1.68K | -- |