| November 14, 2013 | Insight Investment Management (global) LTD | 1.25% | still open |
| November 13, 2013 | Insight Investment Management (global) LTD | 1.32% | still open |
| November 12, 2013 | Blackrock Institutional Trust Company, National Association | 1.02% | still open |
| November 8, 2013 | Insight Investment Management (global) LTD | 1.25% | still open |
| November 8, 2013 | Blackrock Institutional Trust Company, National Association | 0.99% | still open |
| November 7, 2013 | Insight Investment Management (global) LTD | 1.32% | still open |
| November 6, 2013 | Insight Investment Management (global) LTD | 1.19% | still open |
| November 5, 2013 | Insight Investment Management (global) LTD | 1.24% | still open |
| November 5, 2013 | Blackrock Institutional Trust Company, National Association | 1.03% | still open |
| October 23, 2013 | Blackrock Institutional Trust Company, National Association | 1.13% | still open |
| October 9, 2013 | Blackrock Institutional Trust Company, National Association | 1.01% | still open |
| October 2, 2013 | Insight Investment Management (global) LTD | 1.13% | still open |
| October 2, 2013 | Blackrock Institutional Trust Company, National Association | 0.91% | still open |
| September 13, 2013 | Blackrock Institutional Trust Company, National Association | 0.81% | still open |
| September 12, 2013 | Blackrock Institutional Trust Company, National Association | 0.79% | still open |
| September 11, 2013 | Blackrock Institutional Trust Company, National Association | 0.80% | still open |
| September 4, 2013 | Blackrock Institutional Trust Company, National Association | 0.71% | still open |
| August 28, 2013 | Blackrock Investment Management (UK) Limited | 0.61% | still open |
| August 22, 2013 | Blackrock Institutional Trust Company, National Association | 0.61% | still open |
| August 14, 2013 | Blackrock Institutional Trust Company, National Association | 0.52% | still open |
| July 31, 2013 | Insight Investment Management (global) LTD | 1.02% | still open |
| July 29, 2013 | S.A.C. Global Investors LLP | 0.48% | still open |
| July 19, 2013 | Blackrock Investment Management (UK) Limited | 0.59% | still open |
| July 18, 2013 | Blackrock Investment Management (UK) Limited | 0.60% | still open |
| July 9, 2013 | Insight Investment Management (global) LTD | 1.12% | still open |
| July 2, 2013 | Insight Investment Management (global) LTD | 1.02% | still open |
| June 21, 2013 | S.A.C. Global Investors LLP | 0.58% | still open |
| June 20, 2013 | S.A.C. Global Investors LLP | 0.69% | still open |
| June 13, 2013 | S.A.C. Global Investors LLP | 0.79% | still open |
| June 10, 2013 | S.A.C. Global Investors LLP | 0.88% | still open |
| May 31, 2013 | Blackrock Investment Management (UK) Limited | 0.51% | still open |
| May 29, 2013 | S.A.C. Global Investors LLP | 0.97% | still open |
| February 21, 2013 | Blackrock Institutional Trust Company, National Association | 0.49% | still open |
| February 8, 2013 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| February 1, 2013 | S.A.C. Global Investors LLP | 0.81% | still open |
| January 31, 2013 | S.A.C. Global Investors LLP | 0.79% | still open |
| January 29, 2013 | Insight Investment Management (global) LTD | 0.99% | still open |
| January 29, 2013 | Blackrock Institutional Trust Company, National Association | 0.49% | still open |
| January 28, 2013 | Blackrock Investment Management (UK) Limited | 0.48% | still open |
| January 25, 2013 | Insight Investment Management (global) LTD | 1.09% | still open |
| January 25, 2013 | Blackrock Investment Management (UK) Limited | 0.54% | still open |
| January 22, 2013 | Blackrock Institutional Trust Company, National Association | 0.57% | still open |
| December 19, 2012 | Blackrock Institutional Trust Company, National Association | 0.69% | still open |
| December 14, 2012 | Insight Investment Management (global) LTD | 1.10% | still open |
| December 10, 2012 | Blackrock Institutional Trust Company, National Association | 0.72% | still open |
| December 7, 2012 | Insight Investment Management (global) LTD | 1.06% | still open |
| December 6, 2012 | Blackrock Investment Management (UK) Limited | 0.67% | still open |
| December 5, 2012 | S.A.C. Global Investors LLP | 0.93% | still open |
| December 4, 2012 | S.A.C. Global Investors LLP | 1.09% | still open |
| November 23, 2012 | Blackrock Investment Management (UK) Limited | 0.78% | still open |