| September 26, 2013 | GSA Capital Partners LLP | 0.85% | still open |
| September 25, 2013 | Oxford Asset Management | 1.08% | still open |
| September 12, 2013 | Oxford Asset Management | 1.19% | still open |
| September 9, 2013 | Blackrock Institutional Trust Company, National Association | 1.08% | still open |
| August 28, 2013 | Blackrock Investment Management (UK) Limited | 0.68% | still open |
| August 22, 2013 | Oxford Asset Management | 1.27% | still open |
| August 15, 2013 | Blackrock Advisors (UK) Limited | 0.81% | still open |
| August 14, 2013 | Blackrock Investment Management (UK) Limited | 0.71% | still open |
| August 13, 2013 | Blackrock Institutional Trust Company, National Association | 1.10% | still open |
| August 2, 2013 | GSA Capital Partners LLP | 0.90% | still open |
| August 2, 2013 | Blackrock Investment Management (UK) Limited | 0.80% | still open |
| August 2, 2013 | Blackrock Advisors (UK) Limited | 0.71% | still open |
| July 24, 2013 | Blackrock Investment Management (UK) Limited | 0.72% | still open |
| July 19, 2013 | Blackrock Investment Management (UK) Limited | 0.65% | still open |
| July 18, 2013 | Blackrock Institutional Trust Company, National Association | 1.01% | still open |
| July 17, 2013 | Oxford Asset Management | 1.39% | still open |
| July 12, 2013 | Blackrock Advisors (UK) Limited | 0.60% | still open |
| July 9, 2013 | Blackrock Investment Management (UK) Limited | 0.50% | still open |
| July 4, 2013 | Blackrock Institutional Trust Company, National Association | 0.91% | still open |
| June 28, 2013 | Oxford Asset Management | 1.49% | still open |
| June 24, 2013 | Blackrock Advisors (UK) Limited | 0.51% | still open |
| June 20, 2013 | Blackrock Institutional Trust Company, National Association | 0.80% | still open |
| June 10, 2013 | Oxford Asset Management | 1.59% | still open |
| June 7, 2013 | Blackrock Institutional Trust Company, National Association | 0.71% | still open |
| May 22, 2013 | Oxford Asset Management | 1.69% | still open |
| May 15, 2013 | GSA Capital Partners LLP | 0.80% | still open |
| May 10, 2013 | Oxford Asset Management | 1.77% | still open |
| April 30, 2013 | Oxford Asset Management | 1.89% | still open |
| April 24, 2013 | GSA Capital Partners LLP | 0.72% | still open |
| April 22, 2013 | GSA Capital Partners LLP | 0.61% | still open |
| April 22, 2013 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| April 9, 2013 | Oxford Asset Management | 1.91% | still open |
| April 5, 2013 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| March 21, 2013 | Oxford Asset Management | 1.81% | still open |
| March 20, 2013 | Oxford Asset Management | 1.79% | still open |
| March 19, 2013 | Oxford Asset Management | 1.80% | still open |
| March 5, 2013 | Oxford Asset Management | 1.79% | still open |
| March 1, 2013 | Oxford Asset Management | 1.80% | still open |
| February 22, 2013 | Marshall Wace LLP | 0.49% | still open |
| February 21, 2013 | Oxford Asset Management | 1.71% | still open |
| February 18, 2013 | Marshall Wace LLP | 0.55% | still open |
| February 15, 2013 | Oxford Asset Management | 1.62% | still open |
| February 7, 2013 | Oxford Asset Management | 1.51% | still open |
| February 1, 2013 | Oxford Asset Management | 1.42% | still open |
| January 30, 2013 | Oxford Asset Management | 1.32% | still open |
| January 25, 2013 | Oxford Asset Management | 1.22% | still open |
| January 15, 2013 | Oxford Asset Management | 1.10% | still open |
| January 2, 2013 | Oxford Asset Management | 1.08% | still open |
| November 28, 2012 | Oxford Asset Management | 1.10% | still open |
| November 1, 2012 | Oxford Asset Management | 1.07% | still open |