| March 22, 2016 | Blackrock Investment Management (UK) Limited | 0.89% | still open |
| March 22, 2016 | Marshall Wace LLP | 0.50% | still open |
| March 16, 2016 | AQR Capital Management, LLC | 0.69% | still open |
| March 16, 2016 | Millennium International Management LP | 0.69% | still open |
| March 14, 2016 | KEY Group Holdings (cayman), LTD. | 1.19% | still open |
| March 11, 2016 | Odey Asset Management LLP | 0.43% | still open |
| March 10, 2016 | Blackrock Investment Management (UK) Limited | 0.92% | still open |
| March 9, 2016 | KEY Group Holdings (cayman), LTD. | 1.21% | still open |
| March 9, 2016 | AQR Capital Management, LLC | 0.79% | still open |
| March 9, 2016 | Millennium International Management LP | 0.77% | still open |
| March 8, 2016 | Blackrock Investment Management (UK) Limited | 0.89% | still open |
| March 7, 2016 | Millennium International Management LP | 0.82% | still open |
| March 3, 2016 | Blackrock Investment Management (UK) Limited | 0.99% | still open |
| February 29, 2016 | Millennium International Management LP | 0.99% | still open |
| February 29, 2016 | AQR Capital Management, LLC | 0.89% | still open |
| February 22, 2016 | KEY Group Holdings (cayman), LTD. | 1.19% | still open |
| February 18, 2016 | Millennium International Management LP | 1.09% | still open |
| February 18, 2016 | Blackrock Investment Management (UK) Limited | 1.08% | still open |
| February 17, 2016 | Blackrock Investment Management (UK) Limited | 1.10% | still open |
| February 11, 2016 | KEY Group Holdings (cayman), LTD. | 1.29% | still open |
| February 11, 2016 | Blackrock Investment Management (UK) Limited | 1.04% | still open |
| February 10, 2016 | Millennium International Management LP | 1.11% | still open |
| February 10, 2016 | Blackrock Investment Management (UK) Limited | 0.94% | still open |
| February 9, 2016 | Millennium International Management LP | 1.02% | still open |
| February 9, 2016 | AQR Capital Management, LLC | 0.99% | still open |
| February 9, 2016 | Blackrock Investment Management (UK) Limited | 0.80% | still open |
| February 8, 2016 | AQR Capital Management, LLC | 1.00% | still open |
| February 5, 2016 | Millennium International Management LP | 0.95% | still open |
| February 4, 2016 | Millennium International Management LP | 1.06% | still open |
| January 28, 2016 | KEY Group Holdings (cayman), LTD. | 1.38% | still open |
| January 28, 2016 | Millennium International Management LP | 1.10% | still open |
| January 27, 2016 | Millennium International Management LP | 1.05% | still open |
| January 26, 2016 | Millennium International Management LP | 0.95% | still open |
| January 26, 2016 | Blackrock Investment Management (UK) Limited | 0.71% | still open |
| January 25, 2016 | Millennium International Management LP | 0.85% | still open |
| January 25, 2016 | Odey Asset Management LLP | 0.57% | still open |
| January 22, 2016 | KEY Group Holdings (cayman), LTD. | 1.48% | still open |
| January 22, 2016 | AQR Capital Management, LLC | 0.91% | still open |
| January 22, 2016 | Millennium International Management LP | 0.78% | still open |
| January 20, 2016 | KEY Group Holdings (cayman), LTD. | 1.51% | still open |
| January 19, 2016 | Blackrock Investment Management (UK) Limited | 0.62% | still open |
| January 14, 2016 | KEY Group Holdings (cayman), LTD. | 1.41% | still open |
| January 13, 2016 | Millennium International Management LP | 0.62% | still open |
| January 13, 2016 | Blackrock Investment Management (UK) Limited | 0.51% | still open |
| January 11, 2016 | Millennium International Management LP | 0.50% | still open |
| January 8, 2016 | AQR Capital Management, LLC | 0.80% | still open |
| January 6, 2016 | Marshall Wace LLP | 0.47% | still open |
| December 17, 2015 | KEY Group Holdings (cayman), LTD. | 1.31% | still open |
| December 16, 2015 | KEY Group Holdings (cayman), LTD. | 1.27% | still open |
| November 25, 2015 | Marshall Wace LLP | 0.50% | still open |