| June 13, 2016 | Fir Tree Inc. | 0.69% | still open |
| June 12, 2016 | Fir Tree Inc. | 0.69% | still open |
| May 26, 2016 | Fir Tree Inc. | 0.76% | still open |
| May 25, 2016 | Fir Tree Inc. | 0.76% | still open |
| May 23, 2016 | Soroban Capital Partners LLC | 0.82% | still open |
| May 22, 2016 | Soroban Capital Partners LLC | 0.82% | still open |
| November 5, 2015 | Fir Tree Inc. | 0.89% | still open |
| November 4, 2015 | Fir Tree Inc. | 0.89% | still open |
| October 23, 2015 | Fir Tree Inc. | 0.83% | still open |
| October 22, 2015 | Fir Tree Inc. | 0.83% | still open |
| October 20, 2015 | Fir Tree Inc. | 0.70% | still open |
| October 19, 2015 | Fir Tree Inc. | 0.70% | still open |
| October 15, 2015 | Fir Tree Inc. | 0.51% | still open |
| October 14, 2015 | Fir Tree Inc. | 0.51% | still open |
| January 7, 2015 | Eminence Capital, LP | 0.63% | still open |
| January 6, 2015 | Eminence Capital, LP | 0.63% | still open |
| October 6, 2014 | Eminence Capital, LP | 0.52% | still open |
| October 5, 2014 | Eminence Capital, LP | 0.52% | still open |
| July 24, 2014 | Emerging Sovereign Group, LLC | 0.58% | still open |
| July 23, 2014 | Emerging Sovereign Group, LLC | 0.58% | still open |
| July 22, 2014 | Emerging Sovereign Group, LLC | 0.69% | still open |
| July 21, 2014 | Emerging Sovereign Group, LLC | 0.69% | still open |
| July 11, 2014 | Emerging Sovereign Group, LLC | 0.84% | still open |
| July 10, 2014 | Emerging Sovereign Group, LLC | 0.72% | still open |
| July 9, 2014 | Emerging Sovereign Group, LLC | 0.72% | still open |
| May 9, 2014 | Soroban Capital Partners LLC | 0.71% | still open |
| May 8, 2014 | Soroban Capital Partners LLC | 0.71% | still open |
| April 16, 2014 | Emerging Sovereign Group, LLC | 0.53% | still open |
| April 15, 2014 | Emerging Sovereign Group, LLC | 0.53% | still open |
| February 24, 2014 | Soroban Capital Partners LLC | 0.66% | still open |
| February 23, 2014 | Soroban Capital Partners LLC | 0.66% | still open |
| February 21, 2014 | Soroban Capital Partners LLC | 0.59% | still open |
| February 20, 2014 | Soroban Capital Partners LLC | 0.59% | still open |
| April 24, 2013 | Lone Pine Capital LLC | 0.66% | still open |
| April 23, 2013 | Lone Pine Capital LLC | 0.53% | still open |
| April 22, 2013 | Lone Pine Capital LLC | 0.53% | still open |
| March 26, 2013 | BlackRock Institutional Trust Company, National Association | 0.50% | still open |
| March 25, 2013 | BlackRock Institutional Trust Company, National Association | 0.50% | still open |
| January 11, 2013 | BlackRock Institutional Trust Company, National Association | 0.58% | still open |
| January 10, 2013 | BlackRock Institutional Trust Company, National Association | 0.58% | still open |
| January 9, 2013 | BlackRock Institutional Trust Company, National Association | 0.60% | still open |
| January 8, 2013 | BlackRock Institutional Trust Company, National Association | 0.60% | still open |
| January 3, 2013 | BlackRock Institutional Trust Company, National Association | 0.59% | still open |
| January 2, 2013 | BlackRock Institutional Trust Company, National Association | 0.59% | still open |
| December 21, 2012 | BlackRock Institutional Trust Company, National Association | 0.60% | still open |
| December 20, 2012 | BlackRock Institutional Trust Company, National Association | 0.59% | still open |
| December 19, 2012 | BlackRock Institutional Trust Company, National Association | 0.59% | still open |
| December 12, 2012 | BlackRock Institutional Trust Company, National Association | 0.66% | still open |
| December 11, 2012 | BlackRock Institutional Trust Company, National Association | 0.66% | still open |
| December 7, 2012 | BlackRock Institutional Trust Company, National Association | 0.79% | still open |