| November 28, 2018 | Lombard Odier Asset Management (europe) Limited | 1.00% | still open |
| November 23, 2018 | Lombard Odier Asset Management (europe) Limited | 0.99% | still open |
| November 22, 2018 | Lombard Odier Asset Management (europe) Limited | 1.00% | still open |
| October 22, 2018 | Lombard Odier Asset Management (europe) Limited | 1.00% | still open |
| October 18, 2018 | Lombard Odier Asset Management (europe) Limited | 0.90% | still open |
| October 10, 2018 | Lombard Odier Asset Management (europe) Limited | 0.84% | still open |
| September 25, 2018 | Lombard Odier Asset Management (europe) Limited | 0.71% | still open |
| September 6, 2018 | Merian Global Investors (UK) Limited | 1.34% | still open |
| September 6, 2018 | Lombard Odier Asset Management (europe) Limited | 0.63% | still open |
| August 14, 2018 | Lombard Odier Asset Management (europe) Limited | 0.50% | still open |
| August 9, 2018 | Merian Global Investors (UK) Limited | 1.28% | still open |
| August 8, 2018 | Lombard Odier Asset Management (europe) Limited | 0.48% | still open |
| July 18, 2018 | Merian Global Investors (UK) Limited | 1.38% | still open |
| July 17, 2018 | Merian Global Investors (UK) Limited | 1.40% | still open |
| July 17, 2018 | Lombard Odier Asset Management (europe) Limited | 0.52% | still open |
| June 6, 2018 | Merian Global Investors (UK) Limited | 1.70% | still open |
| May 30, 2018 | Merian Global Investors (UK) Limited | 1.60% | still open |
| January 31, 2018 | Merian Global Investors (UK) Limited | 1.41% | still open |
| January 29, 2018 | Merian Global Investors (UK) Limited | 1.39% | still open |
| January 23, 2018 | Merian Global Investors (UK) Limited | 1.13% | still open |
| December 27, 2017 | Lombard Odier Asset Management (europe) Limited | 1.28% | still open |
| August 17, 2017 | Merian Global Investors (UK) Limited | 1.00% | still open |
| August 15, 2017 | Merian Global Investors (UK) Limited | 0.95% | still open |
| July 17, 2017 | Merian Global Investors (UK) Limited | 0.84% | still open |
| May 31, 2017 | Blackrock Investment Management (UK) Limited | 0.49% | still open |
| April 25, 2017 | Blackrock Investment Management (UK) Limited | 0.59% | still open |
| April 24, 2017 | Blackrock Investment Management (UK) Limited | 0.60% | still open |
| April 18, 2017 | Blackrock Investment Management (UK) Limited | 0.59% | still open |
| March 30, 2017 | Merian Global Investors (UK) Limited | 1.09% | still open |
| March 20, 2017 | Merian Global Investors (UK) Limited | 1.13% | still open |
| March 9, 2017 | Merian Global Investors (UK) Limited | 1.09% | still open |
| March 2, 2017 | Blackrock Investment Management (UK) Limited | 0.67% | still open |
| January 24, 2017 | Merian Global Investors (UK) Limited | 0.94% | still open |
| January 24, 2017 | Blackrock Investment Management (UK) Limited | 0.75% | still open |
| January 6, 2017 | Blackrock Investment Management (UK) Limited | 0.68% | still open |
| November 21, 2016 | Merian Global Investors (UK) Limited | 0.74% | still open |
| November 18, 2016 | Merian Global Investors (UK) Limited | 0.60% | still open |
| October 25, 2016 | Merian Global Investors (UK) Limited | 0.54% | still open |
| September 21, 2016 | Blackrock Investment Management (UK) Limited | 0.73% | still open |
| September 13, 2016 | Blackrock Investment Management (UK) Limited | 0.60% | still open |
| August 31, 2016 | Blackrock Investment Management (UK) Limited | 0.50% | still open |
| January 16, 2013 | TIG Advisors, LLC | 0.49% | still open |
| December 31, 2012 | TIG Advisors, LLC | 0.50% | still open |