| August 12, 2013 | Blackrock Institutional Trust Company, National Association | 1.26% | still open |
| August 8, 2013 | Blackrock Advisors (UK) Limited | 0.78% | still open |
| June 24, 2013 | Blackrock Institutional Trust Company, National Association | 1.39% | still open |
| June 11, 2013 | Blackrock Advisors (UK) Limited | 0.89% | still open |
| May 28, 2013 | Blackrock Investment Management (UK) Limited | 0.79% | still open |
| May 13, 2013 | Blackrock Institutional Trust Company, National Association | 1.49% | still open |
| May 9, 2013 | Blackrock Investment Management (UK) Limited | 0.81% | still open |
| May 2, 2013 | Blackrock Advisors (UK) Limited | 0.90% | still open |
| April 30, 2013 | Blackrock Institutional Trust Company, National Association | 1.50% | still open |
| April 19, 2013 | Lucerne Capital Management, L.P. | 0.70% | still open |
| April 12, 2013 | Lucerne Capital Management, L.P. | 0.61% | still open |
| April 9, 2013 | Blackrock Advisors (UK) Limited | 0.89% | still open |
| April 4, 2013 | Blackrock Institutional Trust Company, National Association | 1.40% | still open |
| April 3, 2013 | Blackrock Investment Management (UK) Limited | 0.79% | still open |
| March 22, 2013 | Blackrock Institutional Trust Company, National Association | 1.30% | still open |
| March 21, 2013 | Blackrock Institutional Trust Company, National Association | 1.29% | still open |
| March 18, 2013 | Blackrock Institutional Trust Company, National Association | 1.30% | still open |
| March 15, 2013 | Blackrock Advisors (UK) Limited | 0.99% | still open |
| March 13, 2013 | Blackrock Institutional Trust Company, National Association | 1.20% | still open |
| March 8, 2013 | Blackrock Advisors (UK) Limited | 1.01% | still open |
| March 6, 2013 | Blackrock Institutional Trust Company, National Association | 1.11% | still open |
| March 5, 2013 | Blackrock Institutional Trust Company, National Association | 1.01% | still open |
| March 4, 2013 | Blackrock Advisors (UK) Limited | 0.91% | still open |
| March 1, 2013 | Blackrock Advisors (UK) Limited | 0.87% | still open |
| March 1, 2013 | Blackrock Investment Management (UK) Limited | 0.80% | still open |
| February 28, 2013 | Blackrock Institutional Trust Company, National Association | 0.91% | still open |
| February 28, 2013 | Blackrock Investment Management (UK) Limited | 0.74% | still open |
| February 27, 2013 | Blackrock Institutional Trust Company, National Association | 0.81% | still open |
| February 27, 2013 | Blackrock Advisors (UK) Limited | 0.71% | still open |
| February 21, 2013 | Blackrock Institutional Trust Company, National Association | 0.71% | still open |
| February 20, 2013 | Blackrock Advisors (UK) Limited | 0.60% | still open |
| February 19, 2013 | Blackrock Investment Management (UK) Limited | 0.60% | still open |
| February 14, 2013 | Blackrock Investment Management (UK) Limited | 0.54% | still open |
| February 13, 2013 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| February 13, 2013 | Blackrock Advisors (UK) Limited | 0.50% | still open |
| February 5, 2013 | Blackrock Institutional Trust Company, National Association | 0.52% | still open |