| May 18, 2015 | Elliott Capital Advisors L.P * | 1.57% | |
| May 15, 2015 | Elliott Capital Advisors L.P * | 1.71% | |
| May 14, 2015 | Elliott Capital Advisors L.P * | 1.94% | |
| May 13, 2015 | Elliott Capital Advisors L.P * | 2.16% | |
| May 13, 2015 | Logos International Sicav-Fis * | 0.42% | |
| May 12, 2015 | Elliott Capital Advisors L.P * | 2.38% | |
| May 11, 2015 | Elliott Capital Advisors L.P * | 2.44% | |
| April 30, 2015 | Logos International Sicav-Fis * | 0.52% | |
| April 29, 2015 | Cheyne Capital Management (UK) LLP | 2.38% | |
| April 28, 2015 | Cheyne Capital Management (UK) LLP | 2.44% | |
| April 24, 2015 | Elliott Capital Advisors L.P * | 2.59% | |
| April 23, 2015 | Elliott Capital Advisors L.P * | 2.69% | |
| April 22, 2015 | Elliott Capital Advisors L.P * | 2.74% | |
| April 22, 2015 | Logos International Sicav-Fis * | 0.49% | |
| April 20, 2015 | Elliott Capital Advisors L.P * | 2.87% | |
| April 17, 2015 | Elliott Capital Advisors L.P * | 2.90% | |
| April 16, 2015 | Logos International Sicav-Fis * | 0.59% | |
| March 18, 2015 | Logos International Sicav-Fis * | 0.68% | |
| March 17, 2015 | Logos International Sicav-Fis * | 0.75% | |
| March 6, 2015 | Polygon Global Partners LLP | 0.44% | |
| February 19, 2015 | Polygon Global Partners LLP | 0.55% | |
| February 10, 2015 | Cheyne Capital Management (UK) LLP | 2.51% | |
| February 9, 2015 | Cheyne Capital Management (UK) LLP | 2.48% | |
| February 6, 2015 | Cheyne Capital Management (UK) LLP | 2.39% | |
| February 6, 2015 | Logos International Sicav-Fis * | 0.83% | |
| February 4, 2015 | Cheyne Capital Management (UK) LLP | 2.23% | |
| February 3, 2015 | Cheyne Capital Management (UK) LLP | 2.18% | |
| February 3, 2015 | Logos International Sicav-Fis * | 0.73% | |
| January 30, 2015 | Cheyne Capital Management (UK) LLP | 2.01% | |
| January 29, 2015 | Polygon Global Partners LLP | 0.69% | |
| January 28, 2015 | Elliott Capital Advisors L.P * | 3.04% | |
| January 27, 2015 | Elliott Capital Advisors L.P * | 2.95% | |
| January 27, 2015 | Cheyne Capital Management (UK) LLP | 1.83% | |
| January 26, 2015 | Elliott Capital Advisors L.P * | 2.83% | |
| January 23, 2015 | Elliott Capital Advisors L.P * | 2.66% | |
| January 23, 2015 | Cheyne Capital Management (UK) LLP | 1.70% | |
| January 23, 2015 | Polygon Global Partners LLP | 0.73% | |
| January 23, 2015 | Logos International Sicav-Fis * | 0.64% | |
| January 19, 2015 | Elliott Capital Advisors L.P * | 2.44% | |
| January 16, 2015 | Elliott Capital Advisors L.P * | 2.20% | |
| January 16, 2015 | Polygon Global Partners LLP | 0.66% | |
| January 7, 2015 | Cheyne Capital Management (UK) LLP | 1.48% | |
| January 6, 2015 | Elliott Capital Advisors L.P * | 1.75% | |
| January 6, 2015 | Cheyne Capital Management (UK) LLP | 1.27% | |
| January 6, 2015 | Falcon Edge Capital, LP | 0.23% | |
| January 5, 2015 | Falcon Edge Capital, LP | 0.82% | |
| January 5, 2015 | Cheyne Capital Management (UK) LLP | 0.72% | |
| December 18, 2014 | Polygon Global Partners LLP | 0.54% | |
| December 17, 2014 | Elliott Capital Advisors L.P * | 1.62% | |
| December 16, 2014 | Elliott Capital Advisors L.P * | 1.73% | |